diff --git a/.agents/plugins/marketplace.json b/.agents/plugins/marketplace.json
index 21902cc..c1199bf 100644
--- a/.agents/plugins/marketplace.json
+++ b/.agents/plugins/marketplace.json
@@ -11,7 +11,7 @@
   "plugins": [
     {
       "name": "codex-co-engineer",
-      "version": "3.4.2",
+      "version": "3.4.3",
       "description": "Give Codex a team of external co-engineers without giving up control. Delegating to Co-Engineer starts one bounded run. The honest shape is up to eight isolated external co-engineers, one bounded run, one coordinated wait, one verified decision.",
       "keywords": [
         "codex",
diff --git a/.codex/release-gate.toml b/.codex/release-gate.toml
index 84652ae..d5de00c 100644
--- a/.codex/release-gate.toml
+++ b/.codex/release-gate.toml
@@ -30,6 +30,27 @@ failure_class = "product_test_failed"
 timeout_seconds = 300
 quiet_seconds = 30
 
+[[stages]]
+name = "comparison-fixtures"
+kind = "unit_tests"
+command = ["node", "--no-warnings", "--test", "scripts/compare-coengineer-runs.test.mjs"]
+failure_class = "product_test_failed"
+timeout_seconds = 30
+
+[[stages]]
+name = "trial-usage-unit"
+kind = "unit_tests"
+command = ["node", "--no-warnings", "--test", "scripts/collect-coengineer-trial-usage.test.mjs"]
+failure_class = "product_test_failed"
+timeout_seconds = 30
+
+[[stages]]
+name = "qualification-prep-unit"
+kind = "unit_tests"
+command = ["node", "--no-warnings", "--test", "scripts/prepare-coengineer-qualification.test.mjs"]
+failure_class = "product_test_failed"
+timeout_seconds = 30
+
 [[stages]]
 name = "cursor-compatibility-unit"
 kind = "unit_tests"
diff --git a/.github/ISSUE_TEMPLATE/bug.yml b/.github/ISSUE_TEMPLATE/bug.yml
new file mode 100644
index 0000000..3eb107f
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/bug.yml
@@ -0,0 +1,81 @@
+name: Bug report
+description: Something did not work as expected.
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reporting a problem. A short description of what you tried and what happened is enough to start. You do not need a technical diagnosis.
+
+        Security issues belong on the private [Security](https://github.com/ajhcs/Codex-Co-Engineer/security/advisories/new) route, not in a public issue. See [SECURITY.md](https://github.com/ajhcs/Codex-Co-Engineer/blob/main/SECURITY.md).
+  - type: textarea
+    id: attempt
+    attributes:
+      label: What did you try?
+      description: What you asked for or which steps you followed.
+      placeholder: Asked Codex to use Grok Co-Engineer to review the latest change…
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: What happened?
+      description: The outcome you saw, including any error text you are comfortable sharing.
+      placeholder: The run stayed preparing, or Codex reported a missing local boundary…
+    validations:
+      required: true
+  - type: input
+    id: version
+    attributes:
+      label: Co-Engineer version (optional)
+      description: Public package or release tag if you know it (for example 3.4.2).
+      placeholder: 3.4.2
+    validations:
+      required: false
+  - type: dropdown
+    id: host
+    attributes:
+      label: Host (optional)
+      options:
+        - Codex CLI
+        - Codex Desktop or another Codex host
+        - Unsure / other
+      default: 2
+    validations:
+      required: false
+  - type: dropdown
+    id: provider
+    attributes:
+      label: Provider involved (optional)
+      options:
+        - None / not sure
+        - Grok
+        - Cursor Local
+        - Cursor Cloud
+        - Muse (DSH)
+        - More than one
+      default: 0
+    validations:
+      required: false
+  - type: textarea
+    id: expected
+    attributes:
+      label: What did you expect instead? (optional)
+    validations:
+      required: false
+  - type: textarea
+    id: repro
+    attributes:
+      label: Reproduction notes (optional)
+      description: Smallest steps that reproduce the problem. Synthetic or redacted data only.
+    validations:
+      required: false
+  - type: textarea
+    id: evidence
+    attributes:
+      label: Redacted evidence (optional)
+      description: Paste only sanitized excerpts. Do not include credentials, private paths, full prompts, or private repository contents.
+      placeholder: Sanitized status excerpt or failure category…
+    validations:
+      required: false
diff --git a/.github/ISSUE_TEMPLATE/config.yml b/.github/ISSUE_TEMPLATE/config.yml
new file mode 100644
index 0000000..bef27c7
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/config.yml
@@ -0,0 +1,8 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Security vulnerability
+    url: https://github.com/ajhcs/Codex-Co-Engineer/security/advisories/new
+    about: Private vulnerability reports only. Do not open a public issue for undisclosed security problems. See SECURITY.md.
+  - name: Support overview
+    url: https://github.com/ajhcs/Codex-Co-Engineer/blob/main/SUPPORT.md
+    about: Where to ask questions, report problems, and what helps maintainers.
diff --git a/.github/ISSUE_TEMPLATE/feature.yml b/.github/ISSUE_TEMPLATE/feature.yml
new file mode 100644
index 0000000..6d117ba
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/feature.yml
@@ -0,0 +1,33 @@
+name: Feature or improvement
+description: Suggest an outcome or improvement without designing the implementation.
+title: "[Feature]: "
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Describe the outcome you want. You do not need to design the implementation.
+
+        Questions and usage help belong in a [Question](https://github.com/ajhcs/Codex-Co-Engineer/issues/new?template=question.yml) issue. Security reports stay on the private [Security](https://github.com/ajhcs/Codex-Co-Engineer/security/advisories/new) route.
+  - type: textarea
+    id: outcome
+    attributes:
+      label: Desired outcome
+      description: What should become possible or easier?
+      placeholder: After a failed setup on a supported host, the error should name the missing requirement and the next check to run…
+    validations:
+      required: true
+  - type: textarea
+    id: current
+    attributes:
+      label: Current behavior or workaround (optional)
+      description: What happens today, or how you work around it.
+    validations:
+      required: false
+  - type: textarea
+    id: example
+    attributes:
+      label: Example (optional)
+      description: A short scenario, sample prompt, or before/after sketch. Avoid implementation prescriptions unless you are offering a concrete patch later.
+    validations:
+      required: false
diff --git a/.github/ISSUE_TEMPLATE/question.yml b/.github/ISSUE_TEMPLATE/question.yml
new file mode 100644
index 0000000..f1d646d
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/question.yml
@@ -0,0 +1,25 @@
+name: Question or workflow
+description: Ask for help or share a useful workflow. Discussions is not enabled on this repository.
+title: "[Question]: "
+labels: ["question"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        GitHub Discussions is not enabled for this repository, so questions use Issues.
+
+        For bugs, use the Bug report form. For vulnerabilities, use the private [Security](https://github.com/ajhcs/Codex-Co-Engineer/security/advisories/new) route.
+  - type: textarea
+    id: question
+    attributes:
+      label: Your question or workflow
+      description: What you are trying to do, where you are stuck, or a small workflow others can try.
+    validations:
+      required: true
+  - type: textarea
+    id: context
+    attributes:
+      label: Useful context (optional)
+      description: Version, host, chosen provider, or a short redacted excerpt. No credentials or private paths.
+    validations:
+      required: false
diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
new file mode 100644
index 0000000..46d98da
--- /dev/null
+++ b/.github/pull_request_template.md
@@ -0,0 +1,24 @@
+## Problem
+
+What concrete problem or gap does this change address?
+
+## Result
+
+What behavior or documentation changes for the user or maintainer?
+
+## Checks
+
+List the focused commands you ran (fixture tests preferred; no paid-provider runs required for ordinary docs or fixture work).
+
+```text
+# example
+node --no-warnings --test plugins/codex-co-engineer/test/r1-final-decision-card.test.mjs
+```
+
+## Limits
+
+Known gaps, follow-ups, or intentionally out-of-scope items.
+
+## Agent assistance (optional)
+
+If an agent drafted or edited substantial parts of this change, say so briefly and note what you personally reviewed or verified. You own the complete diff and the claims in this pull request.
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0e1f268..7c4bf44 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,6 +16,8 @@ jobs:
       NPM_CONFIG_CACHE: /tmp/codex-acpx-release-npm-cache
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
       - uses: actions/setup-node@v4
         with:
           node-version: 24
@@ -24,6 +26,9 @@ jobs:
       - run: umask 077 && node scripts/validate-release.mjs
       - run: umask 077 && npm --prefix tools/acpx-vendor ci --ignore-scripts --no-audit --no-fund
       - run: umask 077 && npm --prefix plugins/codex-co-engineer test
+      - run: umask 077 && node --no-warnings --test scripts/compare-coengineer-runs.test.mjs
+      - run: umask 077 && node --no-warnings --test scripts/collect-coengineer-trial-usage.test.mjs
+      - run: umask 077 && node --no-warnings --test scripts/prepare-coengineer-qualification.test.mjs
       - run: umask 077 && npm --prefix plugins/cursor-cloud-control test
       - run: umask 077 && npm --prefix tools/acpx-vendor run test:publish-provenance
       - run: umask 077 && node scripts/inspector-preflight.mjs
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d3925e8..2dee259 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,62 @@
 
 ## [Unreleased]
 
+## [3.4.3] - 2026-09-11
+
+Published at the maintainer's direction with partial qualification. Independent
+code review, real owned corrections, Astra acceptance, the automated release
+gate, and GitHub CI passed. Measured benefit, clean-agent onboarding, refreshed
+native-host acceptance, and Desktop wait/recovery evidence remain incomplete.
+No savings claim is made. See [PR43](https://github.com/ajhcs/Codex-Co-Engineer/pull/43)
+and the [release notes](docs/releases/v3.4.3.md) for retained failures and limits;
+existing qualification requirements remain unchanged.
+
+### Added
+
+- Explicit provider preferences and bounded candidate revisions through the
+  existing Co-Engineer tool surface, preserving external ownership and prior
+  evidence instead of rebuilding correction assignments in the lead agent.
+
+- Ordinary run results and on-demand usage evidence through the existing ledger
+  and decision-card helpers; unknown usage stays unknown and completion never
+  implies Codex acceptance.
+- A one-provider first-outcome example, issue forms, PR template, support links,
+  contributor tasks, roadmap, and a documented real development correction loop.
+- Reproducible frozen comparison cases and an offline analyzer covering native
+  helpers, corrections, failed attempts, exact source identities, and missing
+  acceptance coverage. Synthetic fixtures do not establish savings.
+- OpenAI showcase preparation with the current local-MCP submission limitation.
+
+### Changed
+
+- Delegate complete engineering assignments, checks and corrections to external
+  owners; return compact evidence for Astra and other autonomous lead agents.
+  Preserve final review, host model defaults, and repository authorization.
+
+- Cap owned correction chains at three rounds, reserve one admitted child per
+  producer across server processes, and retain lineage through restart.
+
+### Fixed
+
+- Settle ACP results after persistent-client finalization so immediate runtime
+  close can clean up agents and descendants; retain a deterministic ordering
+  regression and the independently reviewed correction history.
+
+- Point public Grok install docs at the official Grok Build overview and
+  document `grok login` / `grok login --device-auth` subscription login for
+  first-outcome work (no API key).
+- Restore the distinct local marketplace-wrapper path for older open projects
+  that share the public marketplace identity, keep the shipped marketplace
+  manifest stable, and require `plugin/list` persistence checks after restart.
+- Align the 3.4.3 evaluation gate so Astra own-output is measured versus
+  published 3.4.2 (helpers do not satisfy) and paid work does not dispatch
+  beyond the $25 cap.
+- Make supported deadline extensions govern the active ACP turn and preserve
+  timeout/cancellation truth after partial provider output.
+- Preserve empty capability restrictions and complete Unicode review feedback;
+  reject unproven producers and competing feedback instead of silently dropping it.
+- Direct terminal uncertainty to inspection and keep active work on bounded waits.
+
 ## [3.4.2] - 2026-09-08
 
 ### Fixed
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d48d9e7..96ccbc9 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,9 +1,17 @@
 # Contributing
 
-Thanks for helping improve Codex-Co-Engineer. The project is intentionally a
-thin trusted supervisor for Grok, Cursor Local, Cursor Cloud, and DeepSeek
-Harness (DSH). Keep provider capabilities intact and avoid rebuilding a
-second sandbox, target-attestation layer, daemon, or policy engine.
+Thanks for helping improve Codex-Co-Engineer. Documentation fixes, examples,
+compatibility reports, reproductions, tests, and code are all welcome. You do
+not need to start with a large provider change.
+
+**Good first contributions** live in [docs/contributor-tasks.md](docs/contributor-tasks.md).
+Report problems and ask questions through [SUPPORT.md](SUPPORT.md). The
+[roadmap](docs/roadmap.md) separates the 3.4.3 adoption package from later work.
+
+The project is intentionally a thin trusted supervisor for Grok, Cursor Local,
+Cursor Cloud, and DeepSeek Harness (DSH). Keep provider capabilities intact and
+avoid rebuilding a second sandbox, target-attestation layer, daemon, or policy
+engine.
 
 ## Before opening a pull request
 
@@ -17,6 +25,14 @@ not a sandbox or capability restriction. `npm run setup:check` validates the
 CLI/worktree dependencies, while the release/live acceptance validates this
 host boundary.
 
+Focused fixture check (no paid provider required):
+
+```bash
+node --no-warnings --test plugins/codex-co-engineer/test/r1-final-decision-card.test.mjs
+```
+
+Broader local verification before a larger change:
+
 ```bash
 node --version
 npm --prefix plugins/codex-co-engineer test
@@ -94,3 +110,7 @@ release inventory check, MCP Inspector preflight, ACPX provenance/reproducible
 checks, and package-inventory review. Update `CHANGELOG.md` for
 user-visible behavior. Codex reviews and merges the release PR only after
 those checks and any explicit live acceptance are complete.
+
+Agent-assisted drafts are welcome when the submitter owns the complete diff,
+reviews it, and states briefly what was checked. Prefer the pull request
+template's short disclosure over lengthy attestations.
diff --git a/README.md b/README.md
index 886076d..71124fd 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,9 @@
 [![Node.js 24+](https://img.shields.io/badge/Node.js-24%2B-339933?logo=nodedotjs&logoColor=white)](https://nodejs.org/)
 [![MIT license](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
 
-[Install](#install-and-authentication) · [Try it](#your-first-delegation) · [Providers](#provider-choices) · [Release notes](docs/releases/v3.4.2.md) · [Troubleshooting](#troubleshooting)
+[Install](#install-and-authentication) · [Try it](#your-first-delegation) · [Providers](#provider-choices) · [Release notes](docs/releases/v3.4.3.md) · [Troubleshooting](#troubleshooting)
+
+[Report a problem](https://github.com/ajhcs/Codex-Co-Engineer/issues/new?template=bug.yml) · [Suggest an improvement](https://github.com/ajhcs/Codex-Co-Engineer/issues/new?template=feature.yml) · [Ask or share a workflow](https://github.com/ajhcs/Codex-Co-Engineer/issues/new?template=question.yml) · [Contribute](CONTRIBUTING.md)
 
 Ask Codex to bring in **Grok, Cursor, or Muse** for implementation, investigation,
 or a second opinion. Co-Engineer prepares isolated workspaces, coordinates up to
@@ -36,9 +38,12 @@ Choose a provider, describe the work, and keep talking in the same Codex task.
 | Avoid repeated setup decisions | Existing provider choices and optional remembered repository/provider approval |
 | Review before integrating | Retained branches, output, and handoffs for Codex to inspect |
 
-**New in 3.4.2:** simpler launches, reusable consent, more reliable provider
-completion and cleanup, and concise Grok results. Read the
-[detailed release notes](docs/releases/v3.4.2.md) for compatibility and limits.
+**New in 3.4.3:** external ownership through bounded corrections, truthful
+result evidence, deadline-governed ACP turns, and the onboarding / contributor
+package. Automated checks and independent code review passed. Measured workload
+reduction, clean-agent onboarding, and refreshed native-host acceptance remain
+unverified; no savings claim is made. Read the [detailed release notes](docs/releases/v3.4.3.md)
+and historical [3.4.2 notes](docs/releases/v3.4.2.md) for compatibility and limits.
 
 ## Install and authentication
 
@@ -54,34 +59,50 @@ Install the CLI and account access for **only the providers you plan to use**.
 The provider table below separates these requirements. Co-Engineer does not
 install or sign you into Grok or Cursor.
 
-### 2. Install the release
-
-Run these commands from the directory where you keep your projects:
+### 2. Install 3.4.3
 
 ```bash
-git clone --branch v3.4.2 --single-branch https://github.com/ajhcs/Codex-Co-Engineer.git
-cd Codex-Co-Engineer
+git clone --branch v3.4.3 --single-branch https://github.com/ajhcs/Codex-Co-Engineer.git Codex-Co-Engineer-3.4.3
+cd Codex-Co-Engineer-3.4.3
 npm --prefix plugins/codex-co-engineer run setup
 codex plugin marketplace add "$PWD"
 codex plugin add codex-co-engineer@codex-co-engineer
 npm --prefix plugins/codex-co-engineer run setup:check
 ```
 
-Keep this clone: it is the registered local marketplace source. Setup installs
-pinned ACPX, Cursor SDK, and DSH dependencies globally and creates key-free DSH
-configuration. It preserves existing compatible configuration and reports
-incompatible profiles instead of overwriting them. Use a user-writable npm global
-prefix on your `PATH`; a Node version manager is one way to provide it.
+### 3. Keep installation identity consistent
+
+The public release keeps the marketplace identity `codex-co-engineer`.
+Keep the clone as its registered marketplace source. Finish or cancel active
+runs before replacing an installed version. For an existing installation,
+remove `codex-co-engineer@codex-co-engineer` with `codex plugin remove` before
+adding it again from the new source. Preserve provider login files and durable
+task state.
+
+If older open projects still use that public marketplace identity, use a
+distinct local marketplace wrapper outside the tracked release, with the
+unchanged plugin name and exact released plugin bytes. Remove/re-add alone is
+not sufficient: opening an older project can replace the same-name cache again.
+Do not rename the shipped marketplace manifest to solve a local collision.
+Prefer a clean Codex environment for onboarding. See the
+[release notes](docs/releases/v3.4.3.md) for upgrade details and qualification
+limits.
+
+Setup installs pinned ACPX, Cursor SDK, and DSH dependencies globally and creates
+key-free DSH configuration. It preserves existing compatible configuration and
+reports incompatible profiles instead of overwriting them. Use a user-writable
+npm global prefix on your `PATH`; a Node version manager is one way to provide it.
 
-`setup:check` checks Node/Python prerequisites, installed dependencies, and DSH configuration. Provider login
-and the running MCP process's Linux boundary are checked separately by `status`.
-The worktree tool is bundled; no separate `worktree-bootstrap` installation is needed.
+`setup:check` checks Node/Python prerequisites, installed dependencies, and DSH
+configuration. Provider login and the running MCP process's Linux boundary are
+checked separately by `status`. The worktree tool is bundled; no separate
+`worktree-bootstrap` installation is needed.
 
-### 3. Connect your chosen provider
+### 4. Connect your chosen provider
 
 | Provider | One-time authentication | Runs where? |
 | --- | --- | --- |
-| **Grok** | Install [Grok Build](https://docs.x.ai/build/cli), then run `grok login` | Local managed worktree |
+| **Grok** | Install [Grok Build](https://docs.x.ai/build/overview), then run `grok login` (or `grok login --device-auth` when a browser is unavailable). Subscription login only; no API key is required for a Grok first outcome. | Local managed worktree |
 | **Cursor Local** | Install [Cursor CLI](https://cursor.com/docs/cli/installation), then run `cursor-agent login` | Local managed worktree |
 | **Cursor Cloud** | Configure `CURSOR_API_KEY` or an owner-only key file; see [configuration](docs/configuration.md#cursor-cloud) | Cursor's remote environment |
 | **Muse** | From this clone, run `plugins/codex-co-engineer/bin/set-model-api-key` to save your OpenRouter key | Local DSH managed worktree |
@@ -90,9 +111,9 @@ Muse defaults to **Muse Spark 1.3 Contributor, XHigh, through OpenRouter**.
 Provider credentials stay in normal login state, environment variables, or
 owner-only key files. Never paste them into task prompts or MCP arguments.
 
-### 4. Start a new Codex session
+### 5. Start a new Codex session
 
-Ask:
+For a first route, use **one** provider. Grok is the default walkthrough:
 
 > Show Co-Engineer status, then use Grok Co-Engineer to review the latest change.
 
@@ -112,6 +133,11 @@ new decision. [Inspect or revoke remembered access](plugins/codex-co-engineer/RE
 
 ## Your first delegation
 
+Start with [one provider and a small useful outcome](docs/co-engineer-quickstart.md).
+The [copyable example](examples/first-outcome/) in the 3.4.3 source includes a
+fixed local acceptance check. It is also available directly from the
+[v3.4.3 tag](https://github.com/ajhcs/Codex-Co-Engineer/tree/v3.4.3/examples/first-outcome).
+
 > Use Grok Co-Engineer to review the authentication changes. Report actionable findings.
 
 Codex submits the assignment, Co-Engineer prepares its workspace, and the provider
@@ -136,8 +162,8 @@ acknowledgement is not a completed review.
 Independent assignments stay isolated. Assign work that can proceed independently;
 ask for a review of the resulting changes after the implementation is available.
 
-If you have no saved profile and do not name a provider, Codex asks which one to
-use. It does not silently choose a different provider or model.
+If neither your provider preferences nor a named provider resolves the choice,
+Codex asks which one to use. It does not silently choose a different provider or model.
 
 ### Continue, answer, or cancel
 
@@ -151,7 +177,9 @@ use. It does not silently choose a different provider or model.
 
 One grouped decision covers every assignment that asked; unaffected assignments
 can keep working. That answer is chatting with the existing run, not a new launch.
-Chatting requires an existing run. Starting new work remains an explicit delegation.
+Chatting requires an existing run. Ask for a correction to a reviewed candidate
+to return the findings to its external owner. Unrelated new work remains an
+explicit delegation.
 
 <!-- README_ART_SLOT: verified-final-decision -->
 
@@ -170,6 +198,26 @@ It does not describe an incomplete run as a verified result.
 
 </details>
 
+## Autonomous engineering ownership
+
+The revision operation and result reporting require 3.4.3 or newer.
+The budgeted comparison cohort and remaining host qualification stay open;
+see the [release notes](docs/releases/v3.4.3.md) and [scope and roadmap](docs/roadmap.md).
+
+Give Grok or Cursor the complete bounded assignment: relevant preparation,
+implementation, meaningful checks, and requested corrections. Use an independent
+external review where useful; Codex retains final review and integration authority.
+Co-Engineer derives revision identities and concise candidate evidence so the
+lead agent can make decisions without rebuilding routine dispatch paperwork.
+
+Provider preferences are explicit and preserve a directly selected provider.
+They do not infer subscription balances or silently replace an active worker.
+The [autonomous ownership guide](plugins/codex-co-engineer/skills/delegate-to-co-engineer/references/autonomous-ownership.md)
+explains how this reduces coordination work for Astra and other capable agents.
+Measure total native-agent work per accepted result, including any native helpers.
+Read the [actual development correction case](docs/demos/ownership-deadline.md),
+[result and usage guide](docs/run-results.md), and [comparison protocol](benchmarks/).
+
 ## Provider choices
 
 Use your preferred providers for the work at hand. Grok and Cursor keep their
@@ -192,27 +240,21 @@ The [model-role guide](plugins/codex-co-engineer/skills/delegate-to-co-engineer/
 separates practical suggestions from official model documentation. Co-Engineer
 does not change your Codex model, reasoning effort, or experimental settings.
 
-## Upgrade to 3.4.2
-
-Finish or cancel active runs first. In a **clean existing source clone**:
-
-```bash
-git fetch origin tag v3.4.2
-git switch --detach v3.4.2
-npm --prefix plugins/codex-co-engineer run setup
-codex plugin remove codex-co-engineer@codex-co-engineer
-codex plugin add codex-co-engineer@codex-co-engineer
-npm --prefix plugins/codex-co-engineer run setup:check
-```
+## Upgrade to 3.4.3
 
-Start a new Codex session, then check Co-Engineer status. Keep your local changes
-if the source clone is dirty; use a separate clean release clone instead of
-resetting it. If your marketplace uses a different name, use the installed
-identity shown by `codex plugin list`.
+Finish or cancel active runs first. Preserve dirty development checkouts and
+use a clean clone of `v3.4.3`, following the installation instructions above.
+Keep the registered source and local marketplace identity consistent; older
+open projects with the same identity can replace the shared plugin cache.
+Use a distinct local wrapper when required, preserving the public manifest and
+exact released plugin bytes.
 
-Existing task receipts and provider accounts are retained. Users with a direct
-Meta Muse profile must migrate to OpenRouter; see the
-[upgrade notes](docs/releases/v3.4.2.md#upgrading).
+Start a new Codex session, then check Co-Engineer status. Use the identity from
+`codex plugin list` if it differs. Verify project-scoped discovery and installed
+file persistence after a connection restart. Existing task receipts and provider
+accounts are retained. Direct Meta Muse profiles require the unchanged
+OpenRouter migration; see the [upgrade notes](docs/releases/v3.4.3.md#upgrading)
+and historical [3.4.2 notes](docs/releases/v3.4.2.md#upgrading).
 
 ## Troubleshooting
 
@@ -222,7 +264,7 @@ Meta Muse profile must migrate to OpenRouter; see the
 | Local provider is unavailable | Ask for Co-Engineer status; inspect `local_boundary` and the named missing dependency |
 | Setup reports an incompatible Muse profile | Follow the OpenRouter migration in the release notes; keep a backup of your configuration |
 | Repeated repository-sharing prompts | Choose remembered access; confirm the provider and repository origin have not changed |
-| Installed files disappear or an old version returns | Check for another local marketplace using the same identity; use a distinct marketplace name for development candidates |
+| Installed files disappear or an old version returns | Check for another local marketplace using the same identity; when older open projects share the public identity, use a distinct local marketplace wrapper outside the tracked candidate (unchanged plugin name and exact tested bytes), verify `plugin/list` after a connection restart, or use a separate clean Codex environment |
 | Cursor Cloud cannot see a commit | Push the exact SHA and make the branch visible through an open PR or the default branch |
 | No extra panel appears | Continue in the conversation; the CLI workflow is complete without an optional host UI |
 
@@ -256,11 +298,13 @@ single-task calls and full run envelopes remain supported.
 | [Plugin reference](plugins/codex-co-engineer/README.md) | Installed-package setup, authentication, and API examples |
 | [Configuration](docs/configuration.md) | Providers, credentials, profiles, and host variables |
 | [Contributing](CONTRIBUTING.md) | Local commands, compatibility, and review expectations |
+| [Support](SUPPORT.md) and [starter tasks](docs/contributor-tasks.md) | Reports, questions, examples, and approachable contributions |
+| [Showcase preparation](docs/showcase.md) | A source-backed demonstration and current distribution limits |
 | [Release process](docs/release.md) | Exact-candidate qualification and publication |
 
 Co-Engineer keeps coordination compact, but token parity with native subagents
 has not been established. The [efficiency guide](docs/efficient-dogfood.md) explains
 what to measure. Licensed under [MIT](LICENSE).
 
-Historical [3.4.0 notes](docs/releases/v3.4.0.md) and historical
-3.3.0 notes in [the release archive](docs/releases/v3.3.0.md) remain available.
+Historical [3.4.2 notes](docs/releases/v3.4.2.md), [3.4.0 notes](docs/releases/v3.4.0.md),
+and historical 3.3.0 notes in [the release archive](docs/releases/v3.3.0.md) remain available.
diff --git a/SUPPORT.md b/SUPPORT.md
new file mode 100644
index 0000000..ff12cda
--- /dev/null
+++ b/SUPPORT.md
@@ -0,0 +1,35 @@
+# Support
+
+Thanks for using Codex-Co-Engineer. This page explains where to ask for help and what makes a report useful.
+
+## Where to ask
+
+| Need | Where |
+| --- | --- |
+| Bug or unexpected behavior | [Bug report](https://github.com/ajhcs/Codex-Co-Engineer/issues/new?template=bug.yml) |
+| Feature or improvement idea | [Feature or improvement](https://github.com/ajhcs/Codex-Co-Engineer/issues/new?template=feature.yml) |
+| Usage question or clarification | [Question](https://github.com/ajhcs/Codex-Co-Engineer/issues/new?template=question.yml) |
+| Undisclosed vulnerability | Private [Security](https://github.com/ajhcs/Codex-Co-Engineer/security/advisories/new) route ([SECURITY.md](SECURITY.md)) |
+
+GitHub Discussions is **not** enabled on this repository. Questions use Issues until maintainers enable Discussions and update this page.
+
+Maintainers reply when they can; there is no promised response time.
+
+## What helps
+
+- What you tried and what happened (required for bugs).
+- Optional version, host, and provider.
+- Optional short reproduction notes with synthetic or redacted data.
+- Optional sanitized excerpts only—never credentials, private paths, full private prompts, or private repository contents.
+
+A confused first-time setup report is welcome. You do not need a diagnosis.
+
+## Before opening an issue
+
+1. Skim [troubleshooting](docs/co-engineer-troubleshooting.md) and the [quickstart](docs/co-engineer-quickstart.md).
+2. Confirm host prerequisites for local workers when relevant: Linux, `systemd --user`, `systemd-run` 244+, unified cgroup v2, Node.js 24+, and Python 3.11+ for bundled setup.
+3. Prefer the focused fixture checks in [CONTRIBUTING.md](CONTRIBUTING.md) when validating a documentation or code change.
+
+## Contributing
+
+Documentation, examples, compatibility reports, reproductions, tests, and code are all welcome. See [CONTRIBUTING.md](CONTRIBUTING.md), [contributor tasks](docs/contributor-tasks.md), and the [roadmap](docs/roadmap.md).
diff --git a/benchmarks/README.md b/benchmarks/README.md
new file mode 100644
index 0000000..e773ec3
--- /dev/null
+++ b/benchmarks/README.md
@@ -0,0 +1,127 @@
+# Comparison cases
+
+Frozen engineering cases for offline comparison of native Codex (including
+helpers), published 3.4.2, and the exact 3.4.3 candidate. Direct delegation is
+an optional control arm.
+
+This is not a first-run product example. Cases are local file sets with frozen
+acceptance checks. `base_sha` is the Git commit produced by the deterministic
+materializer from those bytes, not a fictional hash and not a paid-run claim.
+`analysis-fixture.json` is a synthetic, unverified record used to exercise the
+offline command. It is not independently verified and is not a live provider
+result.
+
+## Prepare a case
+
+Destination must be empty. The command writes only the frozen relative files
+and creates one reproducible initial commit with fixed Git identity and time.
+
+```bash
+DEST=$(mktemp -d "${TMPDIR:-/tmp}/ce-case-XXXX")
+node scripts/compare-coengineer-runs.mjs \
+  --materialize-case benchmarks/cases/single-file-bugfix.json \
+  --destination "$DEST"
+```
+
+Identity used for that commit:
+
+- name: `Co-Engineer Benchmark`
+- email: `benchmark@invalid`
+- date: `2026-01-01T00:00:00+0000`
+- message: `codex-co-engineer.benchmark-case.v1:<case-id>`
+
+Repeated materialization of the same case in another empty directory must
+produce the same `base_sha`. Trials bind that SHA plus the case `input_digest`.
+
+## Frozen acceptance
+
+Do not edit the case test files to make a trial pass. After materializing,
+run the exact frozen check from the case JSON. Example for
+`single-file-bugfix`:
+
+```bash
+node --test "$DEST/sum.test.mjs"
+```
+
+`failing-check-then-fix`:
+
+```bash
+node --test "$DEST/even.test.mjs"
+```
+
+`review-driven-correction`:
+
+```bash
+node --test "$DEST/parse-count.test.mjs"
+```
+
+`independent-review` is a review-finding case. Acceptance is the frozen
+`must_include` string in the case JSON, not a command, and `clamp.mjs` is
+forbidden to change.
+
+Changed checks change `input_digest` and are rejected unless the frozen digest
+is updated with the case.
+
+## Host and provider config
+
+Comparable trials use the same host model and settings:
+
+```json
+{ "host_model": "codex-default", "host_settings": { "reasoning": "default", "sandbox": "workspace-write" } }
+```
+
+Co-Engineer arms also share the case `provider_configuration` and an exact
+`coengineer_source` identity (git commit or labeled synthetic source). An arm
+label cannot mix candidate builds. Native Codex uses
+`{ "kind": "native", "value": "native-codex" }`. Duplicate case IDs are
+rejected.
+
+For real trials, replace the fixture's `codex-default` label with the actual
+host model id and record the effective settings. Record the external model ids
+and routes in `provider_configuration`, keeping them fixed across Co-Engineer
+arms. Resolve these before collecting a cohort. A stock-default setting is not
+proof that two sessions used the same effective model. Operator-supplied records
+remain unverified until their retained evidence is independently checked.
+
+## Analyze sanitized records
+
+Unknown flags are rejected. `--cases` and `--trials` are required for
+analysis. `--validate-cases DIR` accepts the directory as its own argument.
+
+```bash
+node scripts/compare-coengineer-runs.mjs --validate-cases benchmarks/cases
+node scripts/compare-coengineer-runs.mjs \
+  --cases benchmarks/cases \
+  --trials benchmarks/fixtures/analysis-fixture.json \
+  --protocol benchmarks/protocol.json
+```
+
+The fixture output is labeled `synthetic_unverified`. It does not claim
+`invented_results: false` as independent verification.
+
+## Accounting
+
+- Count every attempt, including failed attempts, every correction, and native
+  helpers.
+- `elapsed_ms` is the sum of attempt durations. `wall_elapsed_ms` is trial wall
+  time. Parallel native helpers are not wall time.
+- Native parent usage must set `native_parent_excludes_helpers: true` when
+  helpers are recorded separately.
+- Same-attempt cumulative snapshots must increase sequence and keep terminal
+  outcomes and provider/model attribution. A later snapshot cannot overwrite a terminal failure with an
+  incompatible outcome.
+- `usage_per_accepted_result` keeps failures and corrections in the numerator.
+  If any trial in the arm is missing `accepted`, the ratio is unknown until
+  acceptance coverage is complete. Zero accepted is not zero cost.
+- Provider tokens and cost stay grouped by provider and model. Mixed
+  provider/model totals are unknown/non-comparable, not one blended number.
+- Native tokens are not converted into subscription dollars.
+
+Repeated trials are extra trial rows with the same case, arm, source identity,
+host settings, and materialized base. Paid live jobs are not implemented:
+
+```bash
+node scripts/compare-coengineer-runs.mjs --live --paid-budget 1
+```
+
+That command still refuses to run jobs. Budgeted paid trials stay manual.
diff --git a/benchmarks/cases/failing-check-then-fix.json b/benchmarks/cases/failing-check-then-fix.json
new file mode 100644
index 0000000..49c429e
--- /dev/null
+++ b/benchmarks/cases/failing-check-then-fix.json
@@ -0,0 +1,30 @@
+{
+  "schema": "codex-co-engineer.benchmark-case.v1",
+  "id": "failing-check-then-fix",
+  "input_digest": "aaabbdcfefffc059272f37df1181bb41f9386a2a1d0a32987de04bfb688f7a06",
+  "base_sha": "b53a14fb12a19a5e35e35ff7eb084a48e6132e6a",
+  "title": "Count a failed check attempt before the accepted fix",
+  "summary": "isEven currently uses remainder 1. Failed attempts remain in the cohort usage-per-accepted-result denominator after the later fix.",
+  "comparable": {
+    "host_model": "codex-default",
+    "host_settings": { "reasoning": "default", "sandbox": "workspace-write" },
+    "provider_configuration": { "implement": "grok", "review": null }
+  },
+  "inputs": {
+    "files": {
+      "even.mjs": "export function isEven(value) {\n  return value % 2 === 1;\n}\n",
+      "even.test.mjs": "import assert from 'node:assert/strict';\nimport test from 'node:test';\nimport { isEven } from './even.mjs';\n\ntest('zero is even', () => {\n  assert.equal(isEven(0), true);\n});\n\ntest('two is even', () => {\n  assert.equal(isEven(2), true);\n});\n"
+    }
+  },
+  "acceptance": {
+    "checks": [
+      {
+        "id": "unit",
+        "command": ["node", "--test", "even.test.mjs"],
+        "expect_exit": 0
+      }
+    ],
+    "required_files": ["even.mjs", "even.test.mjs"],
+    "forbidden_paths": []
+  }
+}
diff --git a/benchmarks/cases/independent-review.json b/benchmarks/cases/independent-review.json
new file mode 100644
index 0000000..510b356
--- /dev/null
+++ b/benchmarks/cases/independent-review.json
@@ -0,0 +1,30 @@
+{
+  "schema": "codex-co-engineer.benchmark-case.v1",
+  "id": "independent-review",
+  "input_digest": "c599d6dec91d5a60e926929134c6cd651db80718c43ba3bc04076c8c6c6e01b8",
+  "base_sha": "5e818a5633788aa841eba133d6d7449b761502e4",
+  "title": "Review a claimed bugfix for a missed equality case",
+  "summary": "Report the missing equal-boundary finding against the frozen candidate. Do not implement the fix in this case.",
+  "comparable": {
+    "host_model": "codex-default",
+    "host_settings": { "reasoning": "default", "sandbox": "workspace-write" },
+    "provider_configuration": { "implement": null, "review": "cursor-local" }
+  },
+  "inputs": {
+    "files": {
+      "clamp.mjs": "export function clamp(value, min, max) {\n  if (value < min) return min;\n  if (value > max) return max;\n  return value;\n}\n",
+      "candidate.diff": "--- a/clamp.mjs\n+++ b/clamp.mjs\n@@ -1,5 +1,5 @@\n export function clamp(value, min, max) {\n-  if (value < min) return min;\n+  if (value <= min) return min;\n   if (value > max) return max;\n   return value;\n }\n"
+    }
+  },
+  "acceptance": {
+    "checks": [
+      {
+        "id": "required-finding",
+        "kind": "review_finding",
+        "must_include": "equal min boundary still returns min, but the claimed fix does not change behavior for value === min"
+      }
+    ],
+    "required_files": ["clamp.mjs", "candidate.diff"],
+    "forbidden_paths": ["clamp.mjs"]
+  }
+}
diff --git a/benchmarks/cases/review-driven-correction.json b/benchmarks/cases/review-driven-correction.json
new file mode 100644
index 0000000..5188f43
--- /dev/null
+++ b/benchmarks/cases/review-driven-correction.json
@@ -0,0 +1,31 @@
+{
+  "schema": "codex-co-engineer.benchmark-case.v1",
+  "id": "review-driven-correction",
+  "input_digest": "32a9a5be9d1ad43ba596799a61c64a6c9d83bd5e2c875c76eac8635ef1b9fa7d",
+  "base_sha": "12b72cb6d8e6c6cfe6b107d09750acebcf2371fa",
+  "title": "Apply a named review finding to a parser helper",
+  "summary": "Rename parseCount to parseNonNegativeCount and reject negative values with a frozen unit check.",
+  "comparable": {
+    "host_model": "codex-default",
+    "host_settings": { "reasoning": "default", "sandbox": "workspace-write" },
+    "provider_configuration": { "implement": "grok", "review": "cursor-local" }
+  },
+  "inputs": {
+    "files": {
+      "parse-count.mjs": "export function parseCount(text) {\n  return Number.parseInt(text, 10);\n}\n",
+      "finding.md": "Finding: parseCount accepts negatives. Rename to parseNonNegativeCount and throw RangeError when the parsed value is less than 0.\n",
+      "parse-count.test.mjs": "import assert from 'node:assert/strict';\nimport test from 'node:test';\nimport { parseNonNegativeCount } from './parse-count.mjs';\n\ntest('parses a non-negative count', () => {\n  assert.equal(parseNonNegativeCount('3'), 3);\n});\n\ntest('rejects negatives', () => {\n  assert.throws(() => parseNonNegativeCount('-1'), RangeError);\n});\n"
+    }
+  },
+  "acceptance": {
+    "checks": [
+      {
+        "id": "unit",
+        "command": ["node", "--test", "parse-count.test.mjs"],
+        "expect_exit": 0
+      }
+    ],
+    "required_files": ["parse-count.mjs", "parse-count.test.mjs"],
+    "forbidden_paths": []
+  }
+}
diff --git a/benchmarks/cases/single-file-bugfix.json b/benchmarks/cases/single-file-bugfix.json
new file mode 100644
index 0000000..0b78f4f
--- /dev/null
+++ b/benchmarks/cases/single-file-bugfix.json
@@ -0,0 +1,30 @@
+{
+  "schema": "codex-co-engineer.benchmark-case.v1",
+  "id": "single-file-bugfix",
+  "input_digest": "54bd89a12cdbb1a66e662467f71d96bfc5e596bafced30f6a0c715c68a71d368",
+  "base_sha": "df49c63059159a79646258358850bef0590ca583",
+  "title": "Repair an off-by-one in a sum helper",
+  "summary": "Make inclusiveRangeSum(start, end) include the end bound and keep the frozen unit check green.",
+  "comparable": {
+    "host_model": "codex-default",
+    "host_settings": { "reasoning": "default", "sandbox": "workspace-write" },
+    "provider_configuration": { "implement": "grok", "review": null }
+  },
+  "inputs": {
+    "files": {
+      "sum.mjs": "export function inclusiveRangeSum(start, end) {\n  let total = 0;\n  for (let value = start; value < end; value += 1) total += value;\n  return total;\n}\n",
+      "sum.test.mjs": "import assert from 'node:assert/strict';\nimport test from 'node:test';\nimport { inclusiveRangeSum } from './sum.mjs';\n\ntest('inclusive range includes the end bound', () => {\n  assert.equal(inclusiveRangeSum(1, 4), 10);\n});\n"
+    }
+  },
+  "acceptance": {
+    "checks": [
+      {
+        "id": "unit",
+        "command": ["node", "--test", "sum.test.mjs"],
+        "expect_exit": 0
+      }
+    ],
+    "required_files": ["sum.mjs", "sum.test.mjs"],
+    "forbidden_paths": []
+  }
+}
diff --git a/benchmarks/fixtures/analysis-fixture.json b/benchmarks/fixtures/analysis-fixture.json
new file mode 100644
index 0000000..cead0d2
--- /dev/null
+++ b/benchmarks/fixtures/analysis-fixture.json
@@ -0,0 +1,129 @@
+{
+  "schema": "codex-co-engineer.benchmark-trials.v1",
+  "provenance": {
+    "class": "synthetic_unverified",
+    "independently_verified": false,
+    "paid_live_jobs": false,
+    "note": "Synthetic fixture records for offline analysis. Not live provider results and not independently verified."
+  },
+  "trials": [
+    {
+      "schema": "codex-co-engineer.benchmark-trial.v1",
+      "trial_id": "bugfix-native-1",
+      "case_id": "single-file-bugfix",
+      "arm": "native-codex",
+      "base_sha": "df49c63059159a79646258358850bef0590ca583",
+      "input_digest": "54bd89a12cdbb1a66e662467f71d96bfc5e596bafced30f6a0c715c68a71d368",
+      "coengineer_source": { "kind": "native", "value": "native-codex" },
+      "host_model": "codex-default",
+      "host_settings": { "reasoning": "default", "sandbox": "workspace-write" },
+      "provider_configuration": { "implement": "native" },
+      "accepted": true,
+      "native_parent_excludes_helpers": true,
+      "wall_elapsed_ms": { "value": 4000, "source": "host_measured", "trust": "host_authoritative" },
+      "attempts": [
+        {
+          "attempt_id": "native-initial",
+          "kind": "initial",
+          "outcome": "completed_unaccepted",
+          "sequence": 1,
+          "usage": {
+            "native_input_tokens": { "value": 80, "source": "host_measured", "trust": "host_authoritative" },
+            "native_output_tokens": { "value": 40, "source": "host_measured", "trust": "host_authoritative" },
+            "native_helper_calls": { "value": 0, "source": "host_measured", "trust": "host_authoritative" },
+            "elapsed_ms": { "value": 4000, "source": "host_measured", "trust": "host_authoritative" }
+          }
+        },
+        {
+          "attempt_id": "native-helper",
+          "kind": "native_helper",
+          "outcome": "accepted",
+          "sequence": 2,
+          "usage": {
+            "native_input_tokens": { "value": 20, "source": "host_measured", "trust": "host_authoritative" },
+            "native_output_tokens": { "value": 10, "source": "host_measured", "trust": "host_authoritative" },
+            "native_helper_calls": { "value": 1, "source": "host_measured", "trust": "host_authoritative" },
+            "elapsed_ms": { "value": 900, "source": "host_measured", "trust": "host_authoritative" }
+          }
+        }
+      ]
+    },
+    {
+      "schema": "codex-co-engineer.benchmark-trial.v1",
+      "trial_id": "bugfix-342-1",
+      "case_id": "single-file-bugfix",
+      "arm": "published-3.4.2",
+      "base_sha": "df49c63059159a79646258358850bef0590ca583",
+      "input_digest": "54bd89a12cdbb1a66e662467f71d96bfc5e596bafced30f6a0c715c68a71d368",
+      "coengineer_source": { "kind": "synthetic_label", "value": "fixture:published-3.4.2" },
+      "host_model": "codex-default",
+      "host_settings": { "reasoning": "default", "sandbox": "workspace-write" },
+      "provider_configuration": { "implement": "grok", "review": null },
+      "accepted": true,
+      "wall_elapsed_ms": { "value": 8000, "source": "host_measured", "trust": "host_authoritative" },
+      "attempts": [
+        {
+          "attempt_id": "ce342-initial",
+          "kind": "initial",
+          "outcome": "accepted",
+          "sequence": 1,
+          "provider": "grok",
+          "model": "grok-4",
+          "usage": {
+            "native_input_tokens": { "value": 30, "source": "host_measured", "trust": "host_authoritative" },
+            "native_output_tokens": { "value": 12, "source": "host_measured", "trust": "host_authoritative" },
+            "provider_input_tokens": { "value": 50, "source": "provider_report", "trust": "provider_untrusted" },
+            "model_facing_bytes": { "value": 900, "source": "host_measured", "trust": "host_authoritative" },
+            "elapsed_ms": { "value": 8000, "source": "host_measured", "trust": "host_authoritative" }
+          }
+        }
+      ]
+    },
+    {
+      "schema": "codex-co-engineer.benchmark-trial.v1",
+      "trial_id": "bugfix-343-1",
+      "case_id": "single-file-bugfix",
+      "arm": "candidate-3.4.3",
+      "base_sha": "df49c63059159a79646258358850bef0590ca583",
+      "input_digest": "54bd89a12cdbb1a66e662467f71d96bfc5e596bafced30f6a0c715c68a71d368",
+      "coengineer_source": { "kind": "synthetic_label", "value": "fixture:candidate-3.4.3" },
+      "host_model": "codex-default",
+      "host_settings": { "reasoning": "default", "sandbox": "workspace-write" },
+      "provider_configuration": { "implement": "grok", "review": null },
+      "accepted": true,
+      "wall_elapsed_ms": { "value": 9200, "source": "host_measured", "trust": "host_authoritative" },
+      "attempts": [
+        {
+          "attempt_id": "ce343-failed",
+          "kind": "initial",
+          "outcome": "failed",
+          "sequence": 1,
+          "provider": "grok",
+          "model": "grok-4",
+          "usage": {
+            "native_input_tokens": { "value": 22, "source": "host_measured", "trust": "host_authoritative" },
+            "native_output_tokens": { "value": 8, "source": "host_measured", "trust": "host_authoritative" },
+            "provider_input_tokens": { "value": 40, "source": "provider_report", "trust": "provider_untrusted" },
+            "correction_rounds": { "value": 0, "source": "host_measured", "trust": "host_authoritative" },
+            "elapsed_ms": { "value": 5000, "source": "host_measured", "trust": "host_authoritative" }
+          }
+        },
+        {
+          "attempt_id": "ce343-fix",
+          "kind": "correction",
+          "outcome": "accepted",
+          "sequence": 2,
+          "provider": "grok",
+          "model": "grok-4",
+          "usage": {
+            "native_input_tokens": { "value": 18, "source": "host_measured", "trust": "host_authoritative" },
+            "native_output_tokens": { "value": 7, "source": "host_measured", "trust": "host_authoritative" },
+            "provider_input_tokens": { "value": 35, "source": "provider_report", "trust": "provider_untrusted" },
+            "correction_rounds": { "value": 1, "source": "host_measured", "trust": "host_authoritative" },
+            "elapsed_ms": { "value": 4200, "source": "host_measured", "trust": "host_authoritative" }
+          }
+        }
+      ]
+    }
+  ]
+}
diff --git a/benchmarks/host-usage.md b/benchmarks/host-usage.md
new file mode 100644
index 0000000..e39796e
--- /dev/null
+++ b/benchmarks/host-usage.md
@@ -0,0 +1,129 @@
+# Host usage import
+
+Offline importer for sanitized Codex session JSONL into comparison trial
+records. This is host accounting only. It does not call providers, open
+budgets, or run the release gate.
+
+## Command
+
+```bash
+node scripts/collect-coengineer-trial-usage.mjs \
+  --manifest path/to/manifest.json \
+  --sessions-root path/to/allowlisted-sessions \
+  [--write path/to/report.json]
+```
+
+Default output is stdout. Session files are read-only. `--write` is required
+to persist a report. Exit status is `0` only for `complete`; `inconclusive`
+returns nonzero. `--write` refuses to overwrite the manifest or any input
+session path. Session realpaths are validated so symlink escapes outside the
+sessions root fail closed.
+
+## Manifest
+
+Schema: `codex-co-engineer.host-usage-manifest.v1`
+
+Required fields:
+
+- `trial` — exact trial identity (`trial_id`, `case_id`, `arm`, `base_sha`,
+  `input_digest`, `coengineer_source`, `host_model`, bounded `host_settings`,
+  bounded `provider_configuration`, optional `accepted`)
+- `window` — inclusive ISO-8601 `{ start, end }` bound for the trial
+- `sessions` — allowlisted session files only (`id`, `role`, relative `path`,
+  and `parent_id` for `native_helper` rows); optional `agent_path` (canonical
+  `/root/...` identity, not a filesystem path) and optional helper
+  `expected_model`; duplicate paths and parent cycles are rejected
+- `phases` — attempt mapping (`attempt_id`, `kind`, `outcome`, `sequence`,
+  `{ start, end }`, `session_id`)
+
+`host_settings` is limited to shareable tokens `{ reasoning, sandbox }` that
+bind to observed `collaboration_mode.settings.reasoning_effort` (explicit
+`null` means default) and `sandbox_policy.type`. Legacy top-level
+`turn_context.effort` is accepted only when collaboration settings omit
+`reasoning_effort`.
+
+`provider_configuration` allowlists `implement` / `review` as either a bounded
+token (`native`, `grok`, `cursor-local`, …) or a bounded object
+`{ provider, model }` so matched trials can pin exact provider+model without
+credential or path leaks. Unknown keys and freeform path/secret fields are
+rejected.
+
+When `accepted` is omitted, the emitted trial omits the field and the report
+is `inconclusive`, but fully measured usage / by_model / cache / compaction
+totals are retained. The importer never scans directories for unrelated
+sessions. Linked native helpers are resolved only by exact allowlisted thread
+ids and parent graph (no basename fallback). `SubAgentActivity.agent_path` is
+canonical agent identity such as `/root/helper`, validated separately as an
+identity/digest, never as a session file path. Unlisted nested children make
+coverage inconclusive; missing allowlisted nested children are rejected.
+Absolute session paths and freeform settings path/secret keys are rejected.
+
+## Event accounting
+
+Primary evidence is `token_usage_record`:
+
+- Deduplicate identical `response_id` rows within a session
+- Identity is `session_id + response_id` so one session cannot suppress another
+- Reject conflicting duplicates
+- When emitted, validate `thread_id` / `session_id` against
+  `session_meta` / manifest; cross-session records are rejected
+- Helper rows keep an exact child `thread_id`. A shared root/ancestor
+  `session_id` is accepted only when manifest `parent_id` ancestry and
+  `session_meta.source.subagent.thread_spawn.parent_thread_id` linkage both
+  prove the full chain; nested helpers may share the original root session.
+  Normal parent `session_meta.source` may be a non-subagent string such as
+  `"cli"` and does not imply a parent link. Unrelated IDs, conflicting parent
+  metadata, unproven ancestors, and a parent's `thread_id` in child usage are
+  rejected
+- Support optional observed `cache_write_input_tokens`; cache stays separate
+  from reasoning, and reasoning remains included in output
+- Carry pre-window model/counters and reconcile in-window deltas to cumulative
+  `thread_token_usage`
+- Assign each source event to at most one phase: start-inclusive,
+  end-exclusive at adjacent boundaries, closed only at a terminal endpoint
+- Count compaction once across phases (compaction output is already inside
+  response records)
+- Bind allowlisted session ids to `session_meta` / thread ids and observable
+  model settings; conflicts reject, unknown attribution is inconclusive
+- Parent host model matches exactly (no alias mapping). Native helpers keep
+  their own observed model/settings; optional per-helper `expected_model`
+
+`event_msg` / `token_count` / `info.total_token_usage` is secondary and may
+omit compaction. It is not authoritative.
+
+`turn_context` supplies model plus current CLI settings fields. Child links
+are parsed from both `event_msg.type=sub_agent_activity` (`kind=started`) and
+`item_completed` / `SubAgentActivity` (`kind=started`), including nested
+started links. Incomplete primary evidence or unlisted nested children makes
+the report `inconclusive`; unknown metrics stay `{ value: null, source:
+"unknown", trust: "unknown" }` and are never coerced to zero.
+
+## Output
+
+Schema: `codex-co-engineer.host-usage-report.v1`
+
+- `trial` — complete `codex-co-engineer.benchmark-trial.v1` input for
+  `scripts/compare-coengineer-runs.mjs`
+- `breakdown` — per-attempt and total model / input-cache / cache-write /
+  reasoning / compaction counters
+- `evidence.digests` — manifest, session, link, and trial digests without raw
+  prompts, reasoning text, output snippets, absolute source paths, or
+  credentials
+
+When parent and helper attempts are both present, the trial sets
+`native_parent_excludes_helpers: true` so parent rows exclude separately
+reported children.
+
+## Budget and reports
+
+Paid budget setup, live provider jobs, and release-gate qualification are
+separate workflows. Do not use this importer to invent measured results or
+subscription-dollar conversions.
+
+## Tests
+
+```bash
+node --test scripts/collect-coengineer-trial-usage.test.mjs
+```
+
+Tests use synthetic fixtures only.
diff --git a/benchmarks/protocol.json b/benchmarks/protocol.json
new file mode 100644
index 0000000..bed1f92
--- /dev/null
+++ b/benchmarks/protocol.json
@@ -0,0 +1,73 @@
+{
+  "schema": "codex-co-engineer.benchmark-protocol.v1",
+  "version": 1,
+  "title": "Codex-Co-Engineer 3.4.3 comparison protocol",
+  "arms": {
+    "required": ["native-codex", "published-3.4.2", "candidate-3.4.3"],
+    "optional": ["direct-delegation"]
+  },
+  "comparable": {
+    "all_arms": ["case_id", "input_digest", "base_sha", "host_model", "host_settings"],
+    "coengineer_arms": ["provider_configuration", "coengineer_source"]
+  },
+  "host": {
+    "model": "codex-default",
+    "settings": { "reasoning": "default", "sandbox": "workspace-write" }
+  },
+  "attempt_kinds": ["initial", "correction", "native_helper"],
+  "metrics": [
+    { "key": "native_input_tokens", "unit": "tokens", "label": "native input tokens" },
+    { "key": "native_output_tokens", "unit": "tokens", "label": "native output tokens" },
+    { "key": "native_helper_calls", "unit": "count", "label": "native helper calls" },
+    { "key": "correction_rounds", "unit": "count", "label": "correction rounds" },
+    { "key": "elapsed_ms", "unit": "milliseconds", "label": "sum of attempt durations, not wall clock" },
+    { "key": "wall_elapsed_ms", "unit": "milliseconds", "label": "trial wall elapsed" },
+    { "key": "provider_input_tokens", "unit": "tokens", "label": "provider-reported input tokens" },
+    { "key": "provider_output_tokens", "unit": "tokens", "label": "provider-reported output tokens" },
+    { "key": "provider_cost_millicents", "unit": "millicents", "label": "provider-reported cost" },
+    { "key": "model_facing_bytes", "unit": "bytes", "label": "host-measured model-facing bytes" },
+    { "key": "evidence_bytes", "unit": "bytes", "label": "retrievable evidence bytes" }
+  ],
+  "materialize": {
+    "author_name": "Co-Engineer Benchmark",
+    "author_email": "benchmark@invalid",
+    "date": "2026-01-01T00:00:00+0000",
+    "empty_destination_only": true,
+    "safe_relative_paths": true
+  },
+  "rules": {
+    "include_every_attempt": true,
+    "include_corrections": true,
+    "include_native_helpers": true,
+    "avoid_double_count_cumulative": true,
+    "terminal_snapshot_continuity": true,
+    "native_parent_excludes_separately_recorded_helpers": true,
+    "wall_elapsed_is_not_attempt_sum": true,
+    "failed_attempts_in_usage_per_accepted": true,
+    "acceptance_rate_with_coverage": true,
+    "usage_per_accepted_requires_complete_acceptance": true,
+    "zero_accepted_is_not_zero_cost": true,
+    "unknown_is_not_zero": true,
+    "never_invent_measured_results": true,
+    "synthetic_fixtures_are_unverified": true,
+    "do_not_claim_independent_verification": true,
+    "label_unrun_and_unmatched": true,
+    "bind_case_input_digest": true,
+    "bind_coengineer_source_identity": true,
+    "reject_duplicate_case_ids": true,
+    "reject_mixed_candidate_identity": true,
+    "preserve_provider_model_groups": true,
+    "mixed_providers_are_non_comparable": true,
+    "source_trust_pairs_enforced": true,
+    "frozen_acceptance_checks": true,
+    "paid_repeated_trials_opt_in": true,
+    "live_jobs_not_implemented": true,
+    "no_proportional_subscription_claims": true
+  },
+  "sources": {
+    "host_measured": "host_authoritative",
+    "provider_report": "provider_untrusted",
+    "evidence_bytes": "host_authoritative",
+    "unknown": "unknown"
+  }
+}
diff --git a/benchmarks/qualification/README.md b/benchmarks/qualification/README.md
new file mode 100644
index 0000000..0e65a75
--- /dev/null
+++ b/benchmarks/qualification/README.md
@@ -0,0 +1,119 @@
+# 3.4.3 retrospective qualification cases
+
+Frozen representative evaluation inputs for public 3.4.3 qualification.
+These three tasks are retrospective: they reconstruct real pre-fix defects
+from public repository history and byte-bind those sources. They are
+**unrun**. This directory is not measured provider evidence.
+
+The existing offline comparator and the four fixtures under
+`benchmarks/cases/` are reused as-is. This helper does not change their API.
+Qualification cases use a separate schema because historical source
+materialization exceeds the small-fixture file and path limits.
+
+Candidate commit SHA and tree SHA, the Astra host model `gpt-6-astra`, host
+settings, and exact per-case `{provider, model}` routes are **not** tracked
+here. Bind them in an external execution manifest before collection.
+`codex-default` is not comparable truth. Do not omit `candidate.tree`.
+
+## Cases
+
+| Case | Pre-fix source SHA | Implement | Review |
+| --- | --- | --- | --- |
+| `acp-deadline-concurrent-cancel` | `dede188029aff117c60e9a8c4299cc0ab0838be9` | Cursor | Grok |
+| `run-result-outcome-acceptance` | `3131f9ac7f6807eccb2ab68f027f1d98d3db3661` | Grok | Cursor |
+| `comparison-failed-helper-cumulative` | `3131f9ac7f6807eccb2ab68f027f1d98d3db3661` | Grok | Cursor |
+
+Each packed case binds that source SHA, SHA-256 digests of the frozen
+allowlist and independent acceptance checks, and the Git commit produced by
+the deterministic materializer. Those hashes are measured, not invented.
+
+Worker context is the bounded historical snapshot plus the frozen prompt and
+checks. It does not include later corrected sources, candidate history, or
+solutions. Acceptance checks the semantic defects, not exact prose.
+
+## Protocol
+
+Four **required** approaches: `native-codex`, `published-3.4.2`,
+`candidate-3.4.3`, and `direct-delegation`. Direct delegation is not optional
+for this qualification. Three distinct cases × two repetitions = 24 trials,
+exactly six per arm. Seeded ordering uses seed `43` with Fisher-Yates over
+case/rep groups, then Fisher-Yates of approach positions within each matched
+group, so the first four scheduled rows are one matched task/rep across all
+four arms and arm order varies across groups. Trial identities are frozen
+hyphen-only ids (arm tokens `published-3-4-2` and `candidate-3-4-3`); they
+must parse with the existing
+comparator `trial_id` pattern. The entire-trial recorded deadline is one hour,
+with at most three corrections.
+
+Record the actual candidate commit SHA and tree SHA, published 3.4.2 SHA,
+Astra host `openai` / `gpt-6-astra`, host settings, frozen input/check
+digests, and exact per-case `{provider, model}` routes in the external
+execution manifest before collection. Native has no external jobs but uses
+the same planned host config. Never invent backend IDs. Do not use one global
+implement/review route: Cursor implements ACP and Grok implements the other
+two cases.
+
+Offline freeze thresholds (see `protocol.json`):
+
+- candidate 6/6 accepted
+- three task-level median native-output-per-accepted ratios: ≤ 50% of native
+  and ≤ 75% of published 3.4.2 (median of the three tasks, not a pooled ratio)
+- Astra own output decreases versus published 3.4.2 by counting `gpt-6-astra`
+  native output once from bound `host-usage-report.v1` `by_model` rows; helpers
+  are excluded unless the helper itself observed Astra. Do not invent provider
+  tokens to populate Astra. Incomplete primary coverage, including
+  `report.status=inconclusive`, stays inconclusive while measured numbers remain
+- median turnaround ≤ 2× native, using the median of per-trial candidate/native
+  wall ratios paired by case and repetition — not the ratio of summed wall
+  durations
+- native overhead ≤ 1.25× direct, using the median of three task ratios of
+  candidate native-output-per-accepted / direct native-output-per-accepted
+- failed attempts, corrections, and helpers remain in the numerator
+- missing primary evidence, missing acceptance, accounting gaps, missing
+  usage reports, and identity mismatches are inconclusive
+- $25 paid ceiling
+
+## Prepare a worker case
+
+Destination must be empty. Prefer `TMPDIR`.
+
+```bash
+DEST=$(mktemp -d "${TMPDIR:-/tmp}/ce-qual-XXXX")
+node scripts/prepare-coengineer-qualification.mjs \
+  --materialize-case benchmarks/qualification/cases/acp-deadline-concurrent-cancel.json \
+  --destination "$DEST"
+node --test "$DEST/checks/deadline-concurrent.test.mjs"
+```
+
+The known-bad source is expected to fail that frozen check.
+
+## Operator extract of pre-fix modules
+
+This is not worker context. It copies an immutable allowlist from the recorded
+pre-fix SHA into an empty destination.
+
+```bash
+DEST=$(mktemp -d "${TMPDIR:-/tmp}/ce-qual-src-XXXX")
+node scripts/prepare-coengineer-qualification.mjs \
+  --extract-source --case comparison-failed-helper-cumulative \
+  --destination "$DEST"
+```
+
+## Evaluate a sanitized cohort
+
+Supply sanitized trial records and a recorded execution manifest. Live jobs
+are not implemented.
+
+```bash
+node scripts/prepare-coengineer-qualification.mjs \
+  --evaluate-cohort \
+  --trials path/to/sanitized-trials.json \
+  --execution-manifest path/to/recorded-execution-manifest.json
+```
+
+## Safeguards
+
+Live jobs are not implemented. Paid repeated trials remain opt-in, capped at
+$25, and this helper still refuses to run them. Do not run the release gate,
+publish, or mutate baseline/candidate trees outside the assigned worktree. The
+public catalog remains `status`, `delegate`, `task`, `tasks`, and `cancel`.
diff --git a/benchmarks/qualification/cases/acp-deadline-concurrent-cancel.json b/benchmarks/qualification/cases/acp-deadline-concurrent-cancel.json
new file mode 100644
index 0000000..7065f2c
--- /dev/null
+++ b/benchmarks/qualification/cases/acp-deadline-concurrent-cancel.json
@@ -0,0 +1,375 @@
+{
+  "schema": "codex-co-engineer.qualification-case.v1",
+  "id": "acp-deadline-concurrent-cancel",
+  "title": "Honor deadline extensions and isolate concurrent ACP cancellation",
+  "summary": "In-flight turns must follow the current recorded deadline, and overlapping sessions must not steal cancellation or promote timeout partials into completed end_turn.",
+  "input_digest": "85e28b36a39db8b6d10a3095e6f81e7b89a0ce1fd3af80056376006cdaffd258",
+  "check_digest": "6ed308603e9f87dff94d41cbca2a87ebc1b2130897ad9de75d5ddb779e818198",
+  "source_sha": "dede188029aff117c60e9a8c4299cc0ab0838be9",
+  "retrospective": true,
+  "status": "unrun",
+  "implement": "cursor-local",
+  "review": "grok",
+  "allowlist": [
+    {
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+      "TASK.md": "# ACP deadline extension and concurrent cancellation\n\nThis retrospective task uses a bounded pre-fix snapshot of public repository\nsource. Repair the historical modules at their original paths so the frozen\nchecks in `checks/deadline-concurrent.test.mjs` pass.\n\nDo not edit the check file, this prompt, or recorded identity. Do not copy\nlater corrected sources, Git history, or other trial outputs into the\nworkspace.\n\nRequired behavior:\n\n- `nextDeadlineExtension` must refuse an empty reason, refuse a silent roll\n  after the recorded deadline has already passed, and require the next\n  deadline to be strictly later than the recorded one.\n- An in-flight ACP turn is governed by the task's current deadline. An audited\n  extension must re-arm that bound. Hitting the original inner timeout after a\n  valid extension is not a successful completed turn.\n- Timeout or interrupt after partial output remains timeout/cancelled. Partial\n  text must not be promoted into a completed `end_turn`.\n- Concurrent turns keep independent cancellation. Aborting turn A must not\n  cancel turn B.\n- A pre-aborted signal fails as cancelled.\n\nAcceptance is the frozen command\n`node --test checks/deadline-concurrent.test.mjs`.\n",
+      "checks/deadline-concurrent.test.mjs": "import assert from 'node:assert/strict';\nimport { mkdir, mkdtemp, readFile, writeFile } from 'node:fs/promises';\nimport { tmpdir } from 'node:os';\nimport path from 'node:path';\nimport test from 'node:test';\n\nimport { runAcpTask } from '../plugins/codex-co-engineer/mcp/v3/acp-worker.mjs';\nimport { nextDeadlineExtension } from '../plugins/codex-co-engineer/mcp/v3/deadline.mjs';\nimport { createTask, readTask, updateTask } from '../plugins/codex-co-engineer/mcp/v3/task-store.mjs';\n\nasync function writeDeadlineAgent(root, behavior) {\n  const agentPath = path.join(root, `deadline-agent-${behavior}.mjs`);\n  await writeFile(agentPath, `import { createInterface } from 'node:readline';\nimport { writeFile } from 'node:fs/promises';\nimport { join } from 'node:path';\nconst behavior = ${JSON.stringify(behavior)};\nfunction send(message) { process.stdout.write(JSON.stringify(message) + '\\\\n'); }\nfunction response(id, result) { send({ jsonrpc: '2.0', id, result }); }\nconst pending = new Map();\nasync function handle(message) {\n  const { id, method, params = {} } = message;\n  if (method === 'initialize') {\n    return response(id, {\n      protocolVersion: 1,\n      agentCapabilities: { loadSession: false, sessionCapabilities: { close: {} } },\n    });\n  }\n  if (method === 'notifications/initialized' || method === 'initialized') return;\n  if (method === 'session/new') return response(id, { sessionId: 'deadline-session-' + behavior });\n  if (method === 'session/close') {\n    await writeFile(join(process.cwd(), '.acpx-fake-close.json'), JSON.stringify(params) + '\\\\n');\n    return response(id, {});\n  }\n  if (method === 'session/cancel') {\n    for (const [promptId, entry] of pending) {\n      if (entry.timer) clearTimeout(entry.timer);\n      response(promptId, { stopReason: 'cancelled' });\n      pending.delete(promptId);\n    }\n    return;\n  }\n  if (method === 'session/prompt') {\n    send({\n      jsonrpc: '2.0',\n      method: 'session/update',\n      params: {\n        sessionId: params.sessionId,\n        update: {\n          sessionUpdate: 'agent_message_chunk',\n          content: { type: 'text', text: 'partial-before-timeout' },\n        },\n      },\n    });\n    if (behavior === 'extend-complete') {\n      const timer = setTimeout(() => {\n        send({\n          jsonrpc: '2.0',\n          method: 'session/update',\n          params: {\n            sessionId: params.sessionId,\n            update: {\n              sessionUpdate: 'agent_message_chunk',\n              content: { type: 'text', text: '+done-after-extend' },\n            },\n          },\n        });\n        response(id, { stopReason: 'end_turn' });\n        pending.delete(id);\n      }, 1_500);\n      pending.set(id, { timer });\n      return;\n    }\n    if (behavior === 'slow-cooperative') {\n      const timer = setTimeout(() => {\n        response(id, { stopReason: 'end_turn' });\n        pending.delete(id);\n      }, 8_000);\n      pending.set(id, { timer });\n      return;\n    }\n    pending.set(id, { timer: null });\n    return;\n  }\n}\nconst rl = createInterface({ input: process.stdin });\nrl.on('line', (line) => {\n  const trimmed = line.trim();\n  if (!trimmed) return;\n  handle(JSON.parse(trimmed)).catch((error) => {\n    process.stderr.write(String(error) + '\\\\n');\n  });\n});\n`);\n  return agentPath;\n}\n\ntest('deadline extension is audited and refuses a silent roll after expiry', () => {\n  const task = {\n    status: 'running',\n    expected_duration_ms: 1000,\n    timeout_ms: 1200,\n    deadline_at: new Date(1_200).toISOString(),\n    deadline_source: 'margin',\n    deadline_extensions: [],\n  };\n  const extended = nextDeadlineExtension(task, {\n    expected_duration_ms: 3000,\n    reason: 'provider still making progress on tests',\n    now: 200,\n  });\n  assert.equal(extended.deadline_source, 'extended');\n  assert.equal(extended.timeout_ms, 3600);\n  assert.equal(Date.parse(extended.deadline_at), 3800);\n  assert.equal(extended.deadline_extensions.length, 1);\n\n  assert.throws(\n    () => nextDeadlineExtension(task, { expected_duration_ms: 5000, reason: 'too late', now: 3800 }),\n    (error) => error.code === 'deadline_expired',\n  );\n  assert.throws(\n    () => nextDeadlineExtension(task, { expected_duration_ms: 5000, now: 300 }),\n    (error) => error.code === 'invalid_extend_reason',\n  );\n  assert.throws(\n    () => nextDeadlineExtension({ ...task, deadline_at: new Date(3800).toISOString() }, {\n      expected_duration_ms: 1000,\n      reason: 'would shrink the recorded deadline',\n      now: 300,\n    }),\n    (error) => error.code === 'deadline_not_extended',\n  );\n});\n\ntest('an in-flight turn is governed by the extended deadline, not the original inner timer', async () => {\n  const root = await mkdtemp(path.join(tmpdir(), 'ce-qual-deadline-extend-'));\n  const cwd = path.join(root, 'worktree');\n  await mkdir(cwd);\n  const agent = await writeDeadlineAgent(root, 'extend-complete');\n  const now = Date.now();\n  const taskId = 'deadline-extend-complete';\n  await createTask({\n    root,\n    prompt: 'finish after extension',\n    record: {\n      id: taskId,\n      status: 'accepted',\n      provider: 'grok',\n      cwd,\n      agent_argv: [process.execPath, agent],\n      timeout_ms: 700,\n      deadline_at: new Date(now + 700).toISOString(),\n    },\n  });\n  setTimeout(() => {\n    updateTask(root, taskId, {\n      deadline_at: new Date(Date.now() + 2_500).toISOString(),\n      timeout_ms: 2_500,\n      deadline_source: 'extended',\n      deadline_extensions: [{ reason: 'provider still making progress', at: new Date().toISOString() }],\n    }).catch(() => {});\n  }, 250);\n  const terminal = await runAcpTask({ root, taskId });\n  assert.equal(terminal.status, 'completed');\n  assert.equal(String(terminal.result).includes('done-after-extend'), true);\n});\n\ntest('timeout after partial output is not promoted to a completed end_turn', async () => {\n  const root = await mkdtemp(path.join(tmpdir(), 'ce-qual-deadline-partial-'));\n  const cwd = path.join(root, 'worktree');\n  await mkdir(cwd);\n  const agent = await writeDeadlineAgent(root, 'partial-hostile');\n  const now = Date.now();\n  const taskId = 'deadline-extend-expire';\n  await createTask({\n    root,\n    prompt: 'expire at the new deadline',\n    record: {\n      id: taskId,\n      status: 'accepted',\n      provider: 'grok',\n      cwd,\n      agent_argv: [process.execPath, agent],\n      timeout_ms: 500,\n      deadline_at: new Date(now + 500).toISOString(),\n    },\n  });\n  setTimeout(() => {\n    updateTask(root, taskId, {\n      deadline_at: new Date(Date.now() + 800).toISOString(),\n      timeout_ms: 800,\n      deadline_source: 'extended',\n    }).catch(() => {});\n  }, 200);\n  const started = Date.now();\n  await assert.rejects(\n    runAcpTask({ root, taskId }),\n    (error) => error.code === 'timeout',\n  );\n  const elapsed = Date.now() - started;\n  assert.ok(elapsed >= 700, `expected expiry near the extended deadline, got ${elapsed}ms`);\n  assert.ok(elapsed < 2_500, `deadline watch should not wait on the original fixed turn timer drain (${elapsed}ms)`);\n  const { task } = await readTask(root, taskId);\n  assert.equal(task.status, 'timeout');\n  assert.notEqual(task.status, 'completed');\n  const events = await readFile(path.join(root, 'tasks', taskId, 'events.jsonl'), 'utf8');\n  assert.match(events, /partial-before-timeout/u);\n  assert.doesNotMatch(events, /\"status\":\"completed\"/u);\n});\n\ntest('concurrent turns keep independent cancellation', async () => {\n  const root = await mkdtemp(path.join(tmpdir(), 'ce-qual-deadline-concurrent-'));\n  const cwdA = path.join(root, 'worktree-a');\n  const cwdB = path.join(root, 'worktree-b');\n  await mkdir(cwdA);\n  await mkdir(cwdB);\n  const agentA = await writeDeadlineAgent(root, 'slow-cooperative');\n  const agentBDir = path.join(root, 'b-agent');\n  await mkdir(agentBDir);\n  const agentB = await writeDeadlineAgent(agentBDir, 'slow-cooperative');\n  await createTask({\n    root,\n    prompt: 'turn A',\n    record: {\n      id: 'turn-a',\n      status: 'accepted',\n      provider: 'grok',\n      cwd: cwdA,\n      agent_argv: [process.execPath, agentA],\n      timeout_ms: 8_000,\n      deadline_at: new Date(Date.now() + 8_000).toISOString(),\n    },\n  });\n  await createTask({\n    root,\n    prompt: 'turn B',\n    record: {\n      id: 'turn-b',\n      status: 'accepted',\n      provider: 'grok',\n      cwd: cwdB,\n      agent_argv: [process.execPath, agentB],\n      timeout_ms: 8_000,\n      deadline_at: new Date(Date.now() + 8_000).toISOString(),\n    },\n  });\n  const abortA = new AbortController();\n  const abortB = new AbortController();\n  const runningA = runAcpTask({ root, taskId: 'turn-a', signal: abortA.signal });\n  const runningB = runAcpTask({ root, taskId: 'turn-b', signal: abortB.signal });\n  await new Promise((resolve) => setTimeout(resolve, 250));\n  abortA.abort();\n  await assert.rejects(runningA, (error) => error.code === 'cancelled');\n  const { task: taskB } = await readTask(root, 'turn-b');\n  assert.notEqual(taskB.status, 'cancelled');\n  abortB.abort();\n  try {\n    await runningB;\n  } catch {\n    // Turn B may still be running; abort is cleanup, not the assertion.\n  }\n});\n\ntest('a pre-aborted signal cancels', async () => {\n  const root = await mkdtemp(path.join(tmpdir(), 'ce-qual-deadline-preabort-'));\n  const cwd = path.join(root, 'worktree');\n  await mkdir(cwd);\n  const agent = await writeDeadlineAgent(root, 'slow-cooperative');\n  await createTask({\n    root,\n    prompt: 'already cancelled',\n    record: {\n      id: 'pre-abort',\n      status: 'accepted',\n      provider: 'grok',\n      cwd,\n      agent_argv: [process.execPath, agent],\n      timeout_ms: 5_000,\n      deadline_at: new Date(Date.now() + 5_000).toISOString(),\n    },\n  });\n  const abort = new AbortController();\n  abort.abort();\n  await assert.rejects(\n    runAcpTask({ root, taskId: 'pre-abort', signal: abort.signal }),\n    (error) => error.code === 'cancelled',\n  );\n});\n"
+    }
+  },
+  "acceptance": {
+    "checks": [
+      {
+        "id": "unit",
+        "command": [
+          "node",
+          "--test",
+          "checks/deadline-concurrent.test.mjs"
+        ],
+        "expect_exit": 0
+      }
+    ],
+    "required_files": [
+      "TASK.md",
+      "checks/deadline-concurrent.test.mjs",
+      "plugins/codex-co-engineer/mcp/v3/acp-worker.mjs",
+      "plugins/codex-co-engineer/mcp/v3/deadline.mjs"
+    ],
+    "forbidden_paths": [
+      "TASK.md",
+      "checks/deadline-concurrent.test.mjs"
+    ]
+  },
+  "base_sha": "7c8374f6eacf39e683c17f3e80c48c96459c3982"
+}
diff --git a/benchmarks/qualification/cases/comparison-failed-helper-cumulative.json b/benchmarks/qualification/cases/comparison-failed-helper-cumulative.json
new file mode 100644
index 0000000..6de071c
--- /dev/null
+++ b/benchmarks/qualification/cases/comparison-failed-helper-cumulative.json
@@ -0,0 +1,89 @@
+{
+  "schema": "codex-co-engineer.qualification-case.v1",
+  "id": "comparison-failed-helper-cumulative",
+  "title": "Count failed attempts, helpers, and compatible cumulative snapshots",
+  "summary": "Failed attempts remain in the usage-per-accepted numerator, helpers are not double-counted, mixed providers stay grouped, and cumulative snapshots cannot overwrite a terminal failure.",
+  "input_digest": "9be19e0d868d479738abc089ad32d57d93133cc9471e209d92316041cb6bcfdd",
+  "check_digest": "39f76e2d2e7e18bf2e50fe41a4a62e6862055048585805f712851344d0355b9f",
+  "source_sha": "3131f9ac7f6807eccb2ab68f027f1d98d3db3661",
+  "retrospective": true,
+  "status": "unrun",
+  "implement": "grok",
+  "review": "cursor-local",
+  "allowlist": [
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/assignment-manifest.mjs",
+      "git_sha256": "b8b90746b059cea51933757b82334db64054fc5525f3d03692f23dc39d52470b",
+      "bytes": 14355
+    },
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/contract.mjs",
+      "git_sha256": "7ec33962e8ed30fbaf628a128ca56bcc907f9d032f909950d394a99cd086970a",
+      "bytes": 4187
+    },
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/grammar.mjs",
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+      "bytes": 5842
+    },
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/identity.mjs",
+      "git_sha256": "80382e0d552f0979859f1bb919b4ceae481743c49213e199e1891b7baab7ede5",
+      "bytes": 26760
+    },
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/prompt-compiler.mjs",
+      "git_sha256": "82b33f2d086e002999a386ef659fc182d2ec22c578578f03b888f294dd18537d",
+      "bytes": 38404
+    },
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/repo-path-matcher.mjs",
+      "git_sha256": "25ffd90555229733e90ede629ec2cf4aad728ee3377e1402eb5f7488f6e87df9",
+      "bytes": 31089
+    },
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/run-manifest.mjs",
+      "git_sha256": "2ed6861654ab629cf5c1756cc3747feba45c047063fee4088973248bd55b4b44",
+      "bytes": 46207
+    },
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/run-policy.mjs",
+      "git_sha256": "aeed773fbff6b96ffdbf08555001a644aadf846155366325944360a9a6702948",
+      "bytes": 6727
+    },
+    {
+      "path": "scripts/compare-coengineer-runs.mjs",
+      "git_sha256": "9db2557d38845899c55cb7f876913b23e29070caa22374f610aa87031995108d",
+      "bytes": 18871
+    }
+  ],
+  "overlay": {
+    "files": {
+      "TASK.md": "# Failed, helper, and cumulative comparison accounting\n\nThis retrospective task uses a bounded pre-fix snapshot of public repository\nsource. Repair the historical modules at their original paths so the frozen\nchecks in `checks/failed-helper-cumulative.test.mjs` pass.\n\nDo not edit the check file, this prompt, or recorded identity. Do not copy\nlater corrected sources, Git history, or other trial outputs into the\nworkspace.\n\nRequired behavior:\n\n- Count every attempt, including failed attempts, corrections, and native\n  helpers. Failed attempts remain in the usage-per-accepted numerator.\n- If any trial in the arm is missing `accepted`, usage-per-accepted and the\n  acceptance rate stay unknown until coverage is complete. Zero accepted is\n  not zero cost.\n- Unknown metrics stay unknown. Missing primary evidence is inconclusive, not\n  measured zero.\n- `elapsed_ms` is the sum of attempt durations. `wall_elapsed_ms` is trial\n  wall time and is not that sum.\n- When native helpers are recorded separately, the parent must set\n  `native_parent_excludes_helpers: true`. Helper usage is added once.\n- Duplicate `attempt_id` values are compatible cumulative snapshots only when\n  kind, provider/model, and terminal outcome stay consistent, sequence\n  increases, and usage is monotone. A later snapshot cannot turn a terminal\n  failure into acceptance or move reported usage onto another model.\n- Provider tokens and cost stay grouped by provider and model. Mixed\n  provider/model totals are unknown/non-comparable, not one blended number.\n- An arm cannot mix `coengineer_source` identities.\n\nAcceptance is the frozen command\n`node --test checks/failed-helper-cumulative.test.mjs`.\n",
+      "checks/failed-helper-cumulative.test.mjs": "import assert from 'node:assert/strict';\nimport { createHash } from 'node:crypto';\nimport test from 'node:test';\n\nimport { canonicalJsonStringify } from '../plugins/codex-co-engineer/mcp/v3/identity.mjs';\nimport {\n  compareTrials,\n  parseTrial,\n} from '../scripts/compare-coengineer-runs.mjs';\n\nconst CASE_SCHEMA = 'codex-co-engineer.benchmark-case.v1';\nconst TRIAL_SCHEMA = 'codex-co-engineer.benchmark-trial.v1';\nconst BASE_SHA = 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa';\nconst CANDIDATE_COMMIT = 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb';\nconst OTHER_COMMIT = 'cccccccccccccccccccccccccccccccccccccccc';\nconst INPUT_DIGEST_DOMAIN = 'codex-co-engineer.benchmark-input.v1';\n\nfunction settings() {\n  return { reasoning: 'high', sandbox: 'workspace-write' };\n}\n\nfunction metric(value, source = 'host_measured') {\n  return {\n    value,\n    source,\n    trust: source === 'provider_report' ? 'provider_untrusted' : 'host_authoritative',\n  };\n}\n\nfunction unknownMetric() {\n  return { value: null, source: 'unknown', trust: 'unknown' };\n}\n\nfunction frozenCase() {\n  const files = { 'TASK.md': '# accounting\\n' };\n  const acceptance = { checks: [{ id: 'unit' }] };\n  return {\n    schema: CASE_SCHEMA,\n    id: 'accounting-case',\n    title: 'accounting',\n    summary: 'failed helper cumulative accounting',\n    base_sha: BASE_SHA,\n    input_digest: createHash('sha256')\n      .update(INPUT_DIGEST_DOMAIN, 'utf8')\n      .update('\\n', 'utf8')\n      .update(canonicalJsonStringify({ files, acceptance }), 'utf8')\n      .digest('hex'),\n    comparable: {\n      host_model: 'recorded-host-model',\n      host_settings: settings(),\n      provider_configuration: { implement: 'grok', review: 'cursor-local' },\n    },\n    inputs: { files },\n    acceptance,\n  };\n}\n\nfunction trial(overrides = {}) {\n  const arm = overrides.arm ?? 'candidate-3.4.3';\n  const caseRecord = frozenCase();\n  return {\n    schema: TRIAL_SCHEMA,\n    trial_id: overrides.trial_id ?? 'trial-one',\n    case_id: 'accounting-case',\n    arm,\n    base_sha: BASE_SHA,\n    input_digest: caseRecord.input_digest,\n    coengineer_source: arm === 'native-codex'\n      ? { kind: 'native', value: 'native-codex' }\n      : { kind: 'git_commit', value: CANDIDATE_COMMIT },\n    host_model: 'recorded-host-model',\n    host_settings: settings(),\n    provider_configuration: arm === 'native-codex'\n      ? { implement: 'native' }\n      : { implement: 'grok', review: 'cursor-local' },\n    accepted: true,\n    wall_elapsed_ms: metric(1000),\n    attempts: [{\n      attempt_id: 'attempt-one',\n      kind: 'initial',\n      outcome: 'accepted',\n      usage: { native_input_tokens: metric(10), elapsed_ms: metric(1000) },\n    }],\n    ...overrides,\n  };\n}\n\nfunction armRow(trials, arm = 'candidate-3.4.3') {\n  const comparison = compareTrials([frozenCase()], trials);\n  return comparison.cases[0].arms[arm];\n}\n\ntest('failed attempts remain in the usage-per-accepted numerator', () => {\n  const row = armRow([trial({\n    trial_id: 'fail-then-pass',\n    accepted: true,\n    attempts: [\n      {\n        attempt_id: 'first',\n        kind: 'initial',\n        outcome: 'failed',\n        usage: { native_input_tokens: metric(10), elapsed_ms: metric(1000) },\n      },\n      {\n        attempt_id: 'second',\n        kind: 'correction',\n        outcome: 'accepted',\n        usage: { native_input_tokens: metric(15), elapsed_ms: metric(2000) },\n      },\n    ],\n  })]);\n  assert.equal(row.accepted_count, 1);\n  assert.equal(row.failed_attempt_count, 1);\n  assert.equal(row.correction_count, 1);\n  assert.equal(row.usage.native_input_tokens.value, 25);\n  assert.equal(row.usage_per_accepted_result.native_input_tokens.value, 25);\n  assert.equal(row.usage_per_accepted_result.native_input_tokens.numerator, 25);\n  assert.match(String(row.usage_per_accepted_result.native_input_tokens.reason), /failed/u);\n});\n\ntest('mixed known and unknown acceptance leaves usage-per-accepted unknown', () => {\n  const missing = structuredClone(trial({ trial_id: 'missing-accept' }));\n  delete missing.accepted;\n  missing.attempts = [{\n    attempt_id: 'maybe',\n    kind: 'initial',\n    outcome: 'uncertain',\n    usage: { native_input_tokens: metric(7) },\n  }];\n  const compared = armRow([\n    trial({ trial_id: 'known-accept' }),\n    missing,\n  ]);\n  assert.equal(compared.accepted_count, 1);\n  assert.equal(compared.usage.native_input_tokens.value, 17);\n  const per = compared.usage_per_accepted_result.native_input_tokens;\n  assert.equal(per.value, null);\n  assert.equal(per.reason, 'incomplete_acceptance_coverage');\n  assert.equal(per.numerator, 17);\n  assert.equal(compared.acceptance_rate.value, null);\n});\n\ntest('zero acceptance is not zero cost and unknown is not measured zero', () => {\n  const row = armRow([trial({\n    trial_id: 'zero-accept',\n    accepted: false,\n    attempts: [{\n      attempt_id: 'only',\n      kind: 'initial',\n      outcome: 'failed',\n      usage: {\n        native_input_tokens: metric(9),\n        native_output_tokens: unknownMetric(),\n      },\n    }],\n  })]);\n  assert.equal(row.accepted_count, 0);\n  assert.equal(row.usage.native_input_tokens.value, 9);\n  assert.equal(row.usage_per_accepted_result.native_input_tokens.value, null);\n  assert.equal(row.usage_per_accepted_result.native_input_tokens.reason, 'zero_accepted_not_zero_cost');\n  assert.equal(row.usage.native_output_tokens.value, null);\n  assert.equal(row.usage.native_output_tokens.source, 'unknown');\n  assert.notEqual(row.usage.native_output_tokens.value, 0);\n});\n\ntest('native helpers are counted once and parent usage must exclude them', () => {\n  assert.throws(() => parseTrial(trial({\n    trial_id: 'parent-plus-helper',\n    attempts: [\n      {\n        attempt_id: 'parent',\n        kind: 'initial',\n        outcome: 'accepted',\n        usage: { native_input_tokens: metric(11), elapsed_ms: metric(600) },\n      },\n      {\n        attempt_id: 'helper',\n        kind: 'native_helper',\n        outcome: 'accepted',\n        usage: { native_helper_calls: metric(1), native_input_tokens: metric(4), elapsed_ms: metric(200) },\n      },\n    ],\n  })), (error) => error.code === 'identity_mismatch');\n\n  const row = armRow([trial({\n    trial_id: 'excluded-parent',\n    native_parent_excludes_helpers: true,\n    wall_elapsed_ms: metric(800),\n    attempts: [\n      {\n        attempt_id: 'parent',\n        kind: 'initial',\n        outcome: 'accepted',\n        usage: { native_input_tokens: metric(11), elapsed_ms: metric(600) },\n      },\n      {\n        attempt_id: 'helper',\n        kind: 'native_helper',\n        outcome: 'accepted',\n        usage: { native_helper_calls: metric(1), native_input_tokens: metric(4), elapsed_ms: metric(200) },\n      },\n    ],\n  })]);\n  assert.equal(row.native_helper_count, 1);\n  assert.equal(row.usage.native_input_tokens.value, 15);\n  assert.equal(row.usage.elapsed_ms.value, 800);\n  assert.equal(row.usage.elapsed_ms.role, 'attempt_duration_sum');\n  assert.equal(row.usage.wall_elapsed_ms.value, 800);\n  assert.equal(row.usage.wall_elapsed_ms.role, 'trial_wall_elapsed');\n});\n\ntest('elapsed_ms is attempt sum and wall_elapsed_ms is trial wall time', () => {\n  const row = armRow([trial({\n    trial_id: 'wall-vs-sum',\n    wall_elapsed_ms: metric(4000),\n    attempts: [\n      {\n        attempt_id: 'first',\n        kind: 'initial',\n        outcome: 'failed',\n        usage: { elapsed_ms: metric(1000) },\n      },\n      {\n        attempt_id: 'second',\n        kind: 'correction',\n        outcome: 'accepted',\n        usage: { elapsed_ms: metric(2500) },\n      },\n    ],\n  })]);\n  assert.equal(row.usage.elapsed_ms.value, 3500);\n  assert.equal(row.usage.elapsed_ms.role, 'attempt_duration_sum');\n  assert.equal(row.usage.wall_elapsed_ms.value, 4000);\n  assert.equal(row.usage.wall_elapsed_ms.role, 'trial_wall_elapsed');\n  assert.notEqual(row.usage.wall_elapsed_ms.value, row.usage.elapsed_ms.value);\n});\n\ntest('duplicate attempt IDs keep the latest compatible cumulative snapshot', () => {\n  const ok = parseTrial(trial({\n    trial_id: 'cumulative-ok',\n    attempts: [\n      {\n        attempt_id: 'same',\n        kind: 'initial',\n        outcome: 'failed',\n        sequence: 1,\n        usage: { native_input_tokens: metric(10) },\n      },\n      {\n        attempt_id: 'same',\n        kind: 'initial',\n        outcome: 'failed',\n        sequence: 2,\n        usage: { native_input_tokens: metric(18) },\n      },\n    ],\n  }));\n  assert.equal(ok.attempts.length, 1);\n  assert.equal(ok.attempts[0].usage.native_input_tokens.value, 18);\n\n  assert.throws(() => parseTrial(trial({\n    trial_id: 'flip-terminal',\n    attempts: [\n      {\n        attempt_id: 'same',\n        kind: 'initial',\n        outcome: 'failed',\n        sequence: 1,\n        usage: { native_input_tokens: metric(10) },\n      },\n      {\n        attempt_id: 'same',\n        kind: 'initial',\n        outcome: 'accepted',\n        sequence: 2,\n        usage: { native_input_tokens: metric(18) },\n      },\n    ],\n  })), (error) => error.code === 'incompatible_snapshot' || error.code === 'duplicate_attempt_id');\n\n  assert.throws(() => parseTrial(trial({\n    trial_id: 'move-model',\n    attempts: [\n      {\n        attempt_id: 'provider-attempt',\n        sequence: 1,\n        kind: 'initial',\n        outcome: 'unfinal',\n        provider: 'grok',\n        model: 'model-a',\n        usage: { provider_output_tokens: metric(20, 'provider_report') },\n      },\n      {\n        attempt_id: 'provider-attempt',\n        sequence: 2,\n        kind: 'initial',\n        outcome: 'unfinal',\n        provider: 'grok',\n        model: 'model-b',\n        usage: { provider_output_tokens: metric(20, 'provider_report') },\n      },\n    ],\n  })), (error) => error.code === 'incompatible_snapshot' || error.code === 'duplicate_attempt_id');\n});\n\ntest('mixed providers keep groups and make aggregate tokens non-comparable', () => {\n  const row = armRow([trial({\n    trial_id: 'two-providers',\n    attempts: [\n      {\n        attempt_id: 'grok-arm',\n        kind: 'initial',\n        outcome: 'completed_unaccepted',\n        provider: 'grok',\n        model: 'grok-4',\n        usage: { provider_input_tokens: metric(40, 'provider_report') },\n      },\n      {\n        attempt_id: 'cursor-arm',\n        kind: 'correction',\n        outcome: 'accepted',\n        provider: 'cursor-local',\n        model: 'composer',\n        usage: { provider_input_tokens: metric(15, 'provider_report') },\n      },\n    ],\n  })]);\n  const grouped = row.usage.provider_input_tokens;\n  assert.equal(grouped.value, null);\n  assert.equal(grouped.reason, 'mixed_providers_non_comparable');\n  assert.equal(grouped.groups.length, 2);\n});\n\ntest('an arm cannot mix coengineer_source identities', () => {\n  assert.throws(() => compareTrials([frozenCase()], [\n    trial({\n      trial_id: 'build-a',\n      coengineer_source: { kind: 'git_commit', value: CANDIDATE_COMMIT },\n    }),\n    trial({\n      trial_id: 'build-b',\n      coengineer_source: { kind: 'git_commit', value: OTHER_COMMIT },\n    }),\n  ]), (error) => error.code === 'mixed_candidate_identity');\n});\n"
+    }
+  },
+  "acceptance": {
+    "checks": [
+      {
+        "id": "unit",
+        "command": [
+          "node",
+          "--test",
+          "checks/failed-helper-cumulative.test.mjs"
+        ],
+        "expect_exit": 0
+      }
+    ],
+    "required_files": [
+      "TASK.md",
+      "checks/failed-helper-cumulative.test.mjs",
+      "scripts/compare-coengineer-runs.mjs"
+    ],
+    "forbidden_paths": [
+      "TASK.md",
+      "checks/failed-helper-cumulative.test.mjs"
+    ]
+  },
+  "base_sha": "cc1ba8a94906ce7e1fb62a52e8bc151f91dc7793"
+}
diff --git a/benchmarks/qualification/cases/run-result-outcome-acceptance.json b/benchmarks/qualification/cases/run-result-outcome-acceptance.json
new file mode 100644
index 0000000..bfff2cf
--- /dev/null
+++ b/benchmarks/qualification/cases/run-result-outcome-acceptance.json
@@ -0,0 +1,131 @@
+{
+  "schema": "codex-co-engineer.qualification-case.v1",
+  "id": "run-result-outcome-acceptance",
+  "title": "Keep run-result outcomes distinct from Codex acceptance",
+  "summary": "Completed provider work is not Codex acceptance. Failed, uncertain, and unfinal stay distinct, verify completion is not a passed check, and missing usage stays unknown.",
+  "input_digest": "b1e7571a963603bc610e41b20bb1683d273181643852c58b71a2a8c32f820cfa",
+  "check_digest": "530956f00bc8e05f8037b4e85f6c3f43a95a11da8a59ca35181a64c6d36df96c",
+  "source_sha": "3131f9ac7f6807eccb2ab68f027f1d98d3db3661",
+  "retrospective": true,
+  "status": "unrun",
+  "implement": "grok",
+  "review": "cursor-local",
+  "allowlist": [
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/artifact-path.mjs",
+      "git_sha256": "ce9170fdbdfa84e526c01fa12e74c54da77b0b998359bbd45f6d614e4142c1b6",
+      "bytes": 14445
+    },
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/artifact-ref.mjs",
+      "git_sha256": "94fcbb60974729a5c9c959b8236e1fbf2a9ff89957080769664b5181100a89b9",
+      "bytes": 16931
+    },
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/assignment-manifest.mjs",
+      "git_sha256": "b8b90746b059cea51933757b82334db64054fc5525f3d03692f23dc39d52470b",
+      "bytes": 14355
+    },
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/capability-bridge.mjs",
+      "git_sha256": "555c7ce7f94a611240cd9ba9d1a59fa9e999071f3c2e6e6fbb984575b1f76f9a",
+      "bytes": 15421
+    },
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/contract.mjs",
+      "git_sha256": "7ec33962e8ed30fbaf628a128ca56bcc907f9d032f909950d394a99cd086970a",
+      "bytes": 4187
+    },
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/final-decision-card.mjs",
+      "git_sha256": "794b756d289c4a7ff315a1168a72835ce033589b079bc4dba96f1589eb3d3e99",
+      "bytes": 54510
+    },
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/grammar.mjs",
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+      "bytes": 5842
+    },
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/identity.mjs",
+      "git_sha256": "80382e0d552f0979859f1bb919b4ceae481743c49213e199e1891b7baab7ede5",
+      "bytes": 26760
+    },
+    {
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+      "git_sha256": "82b33f2d086e002999a386ef659fc182d2ec22c578578f03b888f294dd18537d",
+      "bytes": 38404
+    },
+    {
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+      "git_sha256": "114d9bd6fe03b6a07e515980b4edc1569e03decb72e747e096efec56479fad40",
+      "bytes": 28974
+    },
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/protected-telemetry.mjs",
+      "git_sha256": "cd778870f25278753c1f22059ac9f4ff80afde38484411bb7ed6ebdac266f837",
+      "bytes": 29889
+    },
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+      "bytes": 31089
+    },
+    {
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+      "bytes": 46207
+    },
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+      "git_sha256": "aeed773fbff6b96ffdbf08555001a644aadf846155366325944360a9a6702948",
+      "bytes": 6727
+    },
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/run-result-evidence.mjs",
+      "git_sha256": "f86043263a851c5047fc487df19146da18e6869569a486174e8823672474b5e2",
+      "bytes": 16343
+    },
+    {
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+      "git_sha256": "5baca38e0d5c85bf4081d6bf73179459b6770ce4f9a40118df23a28bceae23b5",
+      "bytes": 10148
+    },
+    {
+      "path": "plugins/codex-co-engineer/mcp/v3/usage-ledger.mjs",
+      "git_sha256": "1e06b0e6c2903e69d5e16ecd8631880e7b6a845d01aacb0deff648b0413e4892",
+      "bytes": 57024
+    }
+  ],
+  "overlay": {
+    "files": {
+      "TASK.md": "# Run-result outcome and acceptance\n\nThis retrospective task uses a bounded pre-fix snapshot of public repository\nsource. Repair the historical modules at their original paths so the frozen\nchecks in `checks/run-result-outcome.test.mjs` pass.\n\nDo not edit the check file, this prompt, or recorded identity. Do not copy\nlater corrected sources, Git history, or other trial outputs into the\nworkspace.\n\nRequired behavior:\n\n- A completed provider job is not Codex acceptance. `codex_accepted` is true\n  only when the assignment result is completed and a Codex acceptance record is\n  bound to this run id and the exact candidate head.\n- Failed, uncertain, and unfinal remain distinct. A failed run stays failed\n  even when a lane completed and produced a head. Uncertain proof\n  (`lifecycle_pending`, unknown dispatch confidence, dirty handoff) is not\n  completed. A still-running lane keeps the result unfinal.\n- Completed verify work is not a passed check. Checks stay empty unless an\n  explicit check record is supplied.\n- Independent lane heads are not one composed candidate. Report a candidate\n  head only for a single lane or an explicit composed=true override.\n- Missing metrics stay unknown. Do not emit numeric zero for absent usage.\n- Shareable text must not leak owner-only prompts, worktree paths, or internal\n  tokens such as `not_accepted`.\n- Stale or unbound Codex acceptance cannot label the result Accepted. A bound\n  acceptance still cannot accept a failed assignment result.\n\nAcceptance is the frozen command\n`node --test checks/run-result-outcome.test.mjs`.\n",
+      "checks/run-result-outcome.test.mjs": "import assert from 'node:assert/strict';\nimport test from 'node:test';\n\nimport { ARTIFACT_REF_SCHEMA_ID } from '../plugins/codex-co-engineer/mcp/v3/artifact-ref.mjs';\nimport {\n  RUN_ADMISSION_RECEIPT_SCHEMA_ID,\n  RUN_RESULT_EVIDENCE_SCHEMA_ID,\n  detailRunResultEvidenceV1,\n  projectRunResultEvidenceV1,\n  summarizeRunResultEvidenceV1,\n} from '../plugins/codex-co-engineer/mcp/v3/run-result-evidence.mjs';\n\nconst RUN_ID = 'run-result-01';\nconst BASE_SHA = 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa';\nconst HEAD_SHA = 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb';\nconst OTHER_HEAD = 'cccccccccccccccccccccccccccccccccccccccc';\nconst HOSTILE_PATH = '/tmp/secret-repo-do-not-leak';\nconst HOSTILE_PROMPT = 'owner-only prompt with secret token';\n\nfunction artifactRef() {\n  return {\n    schema: ARTIFACT_REF_SCHEMA_ID,\n    run_id: RUN_ID,\n    assignment_id: 'lane-writer',\n    artifact_kind: 'git_diff',\n    artifact_class: 'sanitized',\n    relative_path: `runs/${RUN_ID}/lane-writer/diff-1.patch`,\n    byte_length: 128,\n    sha256: 'ab'.repeat(32),\n    media_type: 'text/plain',\n    content_encoding: 'identity',\n  };\n}\n\nfunction writerLane(overrides = {}) {\n  return {\n    assignment_id: 'lane-writer',\n    provider: 'grok',\n    role: 'implement',\n    required: true,\n    phase: 'completed',\n    status: 'completed',\n    prompt_dispatched: true,\n    dispatch_confidence: 'authoritative',\n    task_final: true,\n    clean: true,\n    head: HEAD_SHA,\n    result: HOSTILE_PROMPT,\n    handoff: {\n      worktree: HOSTILE_PATH,\n      current_head: HEAD_SHA,\n      branch: 'ce/lane-writer',\n    },\n    artifact_refs: [artifactRef()],\n    ...overrides,\n  };\n}\n\nfunction receipt(overrides = {}) {\n  const result = {\n    schema: RUN_ADMISSION_RECEIPT_SCHEMA_ID,\n    version: 1,\n    run_id: RUN_ID,\n    phase: 'completed',\n    status: 'completed',\n    base_sha: BASE_SHA,\n    git: { base_sha: BASE_SHA, digest: 'sha256:not-copied' },\n    objective: HOSTILE_PROMPT,\n    complete_candidate_blocked: false,\n    lanes: [writerLane()],\n    ...overrides,\n  };\n  return {\n    ...result,\n    lanes: result.lanes.map((lane) => ({\n      prompt_dispatched: true,\n      dispatch_confidence: 'authoritative',\n      task_final: true,\n      clean: true,\n      ...lane,\n    })),\n  };\n}\n\ntest('completed admission work is not Codex acceptance', () => {\n  const summary = summarizeRunResultEvidenceV1(receipt());\n  assert.equal(summary.schema, RUN_RESULT_EVIDENCE_SCHEMA_ID);\n  assert.equal(summary.assignment_result, 'completed');\n  assert.equal(summary.codex_accepted, false);\n  assert.equal(summary.review_needed, true);\n  assert.equal(summary.next_decision, 'review_candidate');\n  assert.equal(summary.candidate.head, HEAD_SHA);\n  assert.match(summary.text, /needs review/iu);\n  assert.equal(summary.text.includes('not_accepted'), false);\n});\n\ntest('failed, uncertain, and unfinal states stay distinct', () => {\n  const failed = summarizeRunResultEvidenceV1(receipt({\n    phase: 'failed',\n    status: 'failed',\n    lanes: [writerLane({\n      phase: 'failed_pre_prompt',\n      status: 'failed_pre_prompt',\n      head: null,\n    })],\n  }));\n  assert.equal(failed.assignment_result, 'failed');\n  assert.equal(failed.next_decision, 'resolve_failures');\n  assert.equal(failed.codex_accepted, false);\n\n  const uncertain = summarizeRunResultEvidenceV1(receipt({\n    phase: 'needs_attention',\n    status: 'needs_attention',\n    lanes: [writerLane({\n      phase: 'needs_attention',\n      status: 'needs_attention',\n      dispatch_confidence: 'uncertain',\n    })],\n  }));\n  assert.equal(uncertain.assignment_result, 'uncertain');\n  assert.equal(uncertain.unresolved, true);\n  assert.equal(uncertain.next_decision, 'inspect_unresolved');\n\n  const unfinal = summarizeRunResultEvidenceV1(receipt({\n    phase: 'running',\n    status: 'running',\n    lanes: [writerLane({\n      phase: 'running',\n      status: 'running',\n    })],\n  }));\n  assert.equal(unfinal.assignment_result, 'unfinal');\n  assert.equal(unfinal.next_decision, 'wait_for_completion');\n});\n\ntest('mismatched run and lane states stay coherent', () => {\n  const failedWithOutput = summarizeRunResultEvidenceV1(receipt({\n    phase: 'failed',\n    status: 'failed',\n    lanes: [writerLane()],\n  }));\n  assert.equal(failedWithOutput.assignment_result, 'failed');\n  assert.equal(failedWithOutput.label, 'Failed');\n  assert.equal(failedWithOutput.next_decision, 'resolve_failures');\n  assert.equal(failedWithOutput.review_needed, false);\n\n  const pending = summarizeRunResultEvidenceV1(receipt({\n    phase: 'lifecycle_pending',\n    status: 'lifecycle_pending',\n    lanes: [writerLane({ task_final: false })],\n  }));\n  assert.equal(pending.assignment_result, 'uncertain');\n  assert.equal(pending.next_decision, 'inspect_unresolved');\n\n  const unknownProof = summarizeRunResultEvidenceV1(receipt({\n    lanes: [writerLane({ dispatch_confidence: 'unknown' })],\n  }));\n  assert.equal(unknownProof.assignment_result, 'uncertain');\n\n  const dirty = summarizeRunResultEvidenceV1(receipt({\n    lanes: [writerLane({ clean: false })],\n  }));\n  assert.equal(dirty.assignment_result, 'uncertain');\n\n  const stillRunning = summarizeRunResultEvidenceV1(receipt({\n    phase: 'running',\n    status: 'running',\n    lanes: [\n      writerLane(),\n      {\n        assignment_id: 'lane-reviewer',\n        provider: 'cursor-local',\n        role: 'review',\n        required: false,\n        phase: 'running',\n        status: 'running',\n      },\n    ],\n  }));\n  assert.equal(stillRunning.assignment_result, 'unfinal');\n  assert.match(stillRunning.text, /in progress/iu);\n});\n\ntest('completed verify work is not treated as a passed check', () => {\n  const detailed = detailRunResultEvidenceV1(receipt({\n    lanes: [{\n      assignment_id: 'lane-verify',\n      provider: 'grok',\n      role: 'verify',\n      required: true,\n      phase: 'completed',\n      status: 'completed',\n      prompt_dispatched: true,\n      dispatch_confidence: 'authoritative',\n      task_final: true,\n      clean: true,\n      head: HEAD_SHA,\n    }],\n  }));\n  assert.equal(detailed.assignment_result, 'completed');\n  assert.equal(detailed.assignments[0].role, 'verify');\n  assert.equal(detailed.assignments[0].outcome, 'completed');\n  assert.equal(detailed.checks.length, 0);\n  assert.equal(detailed.codex_accepted, false);\n  assert.equal(detailed.review_needed, true);\n});\n\ntest('candidate heads stay unambiguous and composition must be explicit', () => {\n  const mixed = summarizeRunResultEvidenceV1(receipt({\n    lanes: [\n      writerLane(),\n      {\n        assignment_id: 'lane-docs',\n        provider: 'cursor-local',\n        role: 'implement',\n        required: true,\n        phase: 'completed',\n        status: 'completed',\n        prompt_dispatched: true,\n        dispatch_confidence: 'authoritative',\n        task_final: true,\n        clean: true,\n        head: OTHER_HEAD,\n      },\n    ],\n  }));\n  assert.equal(mixed.candidate.head, null);\n  assert.equal(mixed.candidate.composed, false);\n\n  const composed = projectRunResultEvidenceV1({\n    receipt: receipt({\n      lanes: [\n        writerLane(),\n        {\n          assignment_id: 'lane-docs',\n          provider: 'cursor-local',\n          role: 'implement',\n          required: true,\n          phase: 'completed',\n          status: 'completed',\n          prompt_dispatched: true,\n          dispatch_confidence: 'authoritative',\n          task_final: true,\n          clean: true,\n          head: OTHER_HEAD,\n        },\n      ],\n    }),\n    candidate: {\n      head: HEAD_SHA,\n      composed: true,\n    },\n  });\n  assert.equal(composed.candidate.head, HEAD_SHA);\n  assert.equal(composed.candidate.composed, true);\n});\n\ntest('missing metrics stay unknown and shareable text omits owner-only data', () => {\n  const missing = summarizeRunResultEvidenceV1(receipt());\n  assert.equal(missing.usage.present, false);\n  assert.equal(JSON.stringify(missing.usage).includes('\"value\":0'), false);\n  assert.equal(missing.text.includes(HOSTILE_PATH), false);\n  assert.equal(missing.text.includes(HOSTILE_PROMPT), false);\n  assert.equal(missing.text.includes('/tmp/'), false);\n  assert.equal(missing.text.includes('not_accepted'), false);\n});\n\ntest('unbound or stale Codex acceptance cannot label Accepted', () => {\n  const flagOnly = projectRunResultEvidenceV1({\n    receipt: receipt(),\n    codex_acceptance: { accepted: true, authority: 'codex' },\n  });\n  assert.equal(flagOnly.codex_accepted, false);\n  assert.equal(flagOnly.label, 'Review needed');\n\n  const stale = projectRunResultEvidenceV1({\n    receipt: receipt(),\n    codex_acceptance: {\n      accepted: true,\n      authority: 'codex',\n      run_id: RUN_ID,\n      head: OTHER_HEAD,\n    },\n  });\n  assert.equal(stale.codex_accepted, false);\n\n  const bound = projectRunResultEvidenceV1({\n    receipt: receipt(),\n    codex_acceptance: {\n      accepted: true,\n      authority: 'codex',\n      run_id: RUN_ID,\n      head: HEAD_SHA,\n    },\n  });\n  assert.equal(bound.codex_accepted, true);\n  assert.equal(bound.label, 'Accepted');\n\n  const failed = projectRunResultEvidenceV1({\n    receipt: receipt({\n      phase: 'failed',\n      status: 'failed',\n      lanes: [writerLane({ phase: 'failed', status: 'failed' })],\n    }),\n    codex_acceptance: {\n      accepted: true,\n      authority: 'codex',\n      run_id: RUN_ID,\n      head: HEAD_SHA,\n    },\n  });\n  assert.equal(failed.codex_accepted, false);\n  assert.equal(failed.label, 'Failed');\n});\n"
+    }
+  },
+  "acceptance": {
+    "checks": [
+      {
+        "id": "unit",
+        "command": [
+          "node",
+          "--test",
+          "checks/run-result-outcome.test.mjs"
+        ],
+        "expect_exit": 0
+      }
+    ],
+    "required_files": [
+      "TASK.md",
+      "checks/run-result-outcome.test.mjs",
+      "plugins/codex-co-engineer/mcp/v3/run-result-evidence.mjs",
+      "plugins/codex-co-engineer/mcp/v3/final-decision-card.mjs",
+      "plugins/codex-co-engineer/mcp/v3/usage-ledger.mjs"
+    ],
+    "forbidden_paths": [
+      "TASK.md",
+      "checks/run-result-outcome.test.mjs"
+    ]
+  },
+  "base_sha": "5884323286145e6f71a64fb92d723431633b6fa6"
+}
diff --git a/benchmarks/qualification/fixtures/host-usage-report-astra.json b/benchmarks/qualification/fixtures/host-usage-report-astra.json
new file mode 100644
index 0000000..2e85880
--- /dev/null
+++ b/benchmarks/qualification/fixtures/host-usage-report-astra.json
@@ -0,0 +1,157 @@
+{
+  "schema": "codex-co-engineer.host-usage-report.v1",
+  "status": "complete",
+  "trial": {
+    "schema": "codex-co-engineer.benchmark-trial.v1",
+    "trial_id": "acp-deadline-concurrent-cancel-candidate-3-4-3-r2",
+    "case_id": "acp-deadline-concurrent-cancel",
+    "arm": "candidate-3.4.3",
+    "base_sha": "7c8374f6eacf39e683c17f3e80c48c96459c3982",
+    "input_digest": "85e28b36a39db8b6d10a3095e6f81e7b89a0ce1fd3af80056376006cdaffd258",
+    "coengineer_source": {
+      "kind": "git_commit",
+      "value": "c0ffeeabc0ffeeabc0ffeeabc0ffeeabc0ffeeab"
+    },
+    "host_model": "gpt-6-astra",
+    "host_settings": {
+      "reasoning": "high",
+      "sandbox": "workspace-write"
+    },
+    "provider_configuration": {
+      "implement": {
+        "provider": "cursor-local",
+        "model": "composer-1"
+      },
+      "review": {
+        "provider": "grok",
+        "model": "grok-4"
+      }
+    },
+    "wall_elapsed_ms": {
+      "value": 1500,
+      "source": "host_measured",
+      "trust": "host_authoritative"
+    },
+    "attempts": [
+      {
+        "attempt_id": "initial",
+        "kind": "initial",
+        "outcome": "accepted",
+        "sequence": 1,
+        "usage": {
+          "native_input_tokens": {
+            "value": 80,
+            "source": "host_measured",
+            "trust": "host_authoritative"
+          },
+          "native_output_tokens": {
+            "value": 40,
+            "source": "host_measured",
+            "trust": "host_authoritative"
+          },
+          "native_helper_calls": {
+            "value": 0,
+            "source": "host_measured",
+            "trust": "host_authoritative"
+          },
+          "correction_rounds": {
+            "value": 0,
+            "source": "host_measured",
+            "trust": "host_authoritative"
+          },
+          "elapsed_ms": {
+            "value": 11000,
+            "source": "host_measured",
+            "trust": "host_authoritative"
+          },
+          "provider_input_tokens": {
+            "value": null,
+            "source": "unknown",
+            "trust": "unknown"
+          },
+          "provider_output_tokens": {
+            "value": null,
+            "source": "unknown",
+            "trust": "unknown"
+          },
+          "provider_cost_millicents": {
+            "value": null,
+            "source": "unknown",
+            "trust": "unknown"
+          },
+          "model_facing_bytes": {
+            "value": null,
+            "source": "unknown",
+            "trust": "unknown"
+          },
+          "evidence_bytes": {
+            "value": null,
+            "source": "unknown",
+            "trust": "unknown"
+          }
+        }
+      }
+    ],
+    "accepted": true
+  },
+  "breakdown": {
+    "attempts": [
+      {
+        "attempt_id": "initial",
+        "session_id": "parent-session",
+        "input_tokens": 80,
+        "cached_input_tokens": 10,
+        "cache_write_input_tokens": 2,
+        "output_tokens": 40,
+        "reasoning_output_tokens": 12,
+        "compaction_events": 0,
+        "by_model": [
+          {
+            "model": "gpt-6-astra",
+            "input_tokens": 80,
+            "cached_input_tokens": 10,
+            "output_tokens": 40,
+            "reasoning_output_tokens": 12,
+            "total_tokens": 120,
+            "cache_write_input_tokens": 2
+          }
+        ]
+      }
+    ],
+    "totals": {
+      "input_tokens": 80,
+      "cached_input_tokens": 10,
+      "cache_write_input_tokens": 2,
+      "output_tokens": 40,
+      "reasoning_output_tokens": 12,
+      "compaction_events": 0
+    },
+    "accounting": {
+      "response_id_deduped": true,
+      "response_identity": "session_and_response",
+      "phase_endpoints": "start_inclusive_end_exclusive_unless_terminal",
+      "compaction_counted_once": true,
+      "reasoning_included_in_output": true,
+      "cache_counters_separate": true,
+      "secondary_token_count": "non_authoritative",
+      "native_parent_excludes_helpers": false,
+      "walked_sessions": [
+        "parent-session"
+      ],
+      "acceptance_unknown": false,
+      "measurement_incomplete": false
+    }
+  },
+  "evidence": {
+    "digests": {
+      "manifest": "6ffdbbe7bf1d733899bac37b9ca70deadfbaec06d962d6ecba7db5f5c3c7d37a",
+      "sessions": {
+        "parent-session": "2140108ad836dc5fdaf5ab6ec66b1b36a4f0d43d76984ac003bc9305450a98ca"
+      },
+      "links": [],
+      "trial": "46841902ce7188459c67ac276d28f665955742067a64d779ca8c66b310a3e210"
+    },
+    "notes": [],
+    "incomplete_primary_evidence": false
+  }
+}
diff --git a/benchmarks/qualification/inputs/acp-deadline-concurrent-cancel/TASK.md b/benchmarks/qualification/inputs/acp-deadline-concurrent-cancel/TASK.md
new file mode 100644
index 0000000..65d6d79
--- /dev/null
+++ b/benchmarks/qualification/inputs/acp-deadline-concurrent-cancel/TASK.md
@@ -0,0 +1,26 @@
+# ACP deadline extension and concurrent cancellation
+
+This retrospective task uses a bounded pre-fix snapshot of public repository
+source. Repair the historical modules at their original paths so the frozen
+checks in `checks/deadline-concurrent.test.mjs` pass.
+
+Do not edit the check file, this prompt, or recorded identity. Do not copy
+later corrected sources, Git history, or other trial outputs into the
+workspace.
+
+Required behavior:
+
+- `nextDeadlineExtension` must refuse an empty reason, refuse a silent roll
+  after the recorded deadline has already passed, and require the next
+  deadline to be strictly later than the recorded one.
+- An in-flight ACP turn is governed by the task's current deadline. An audited
+  extension must re-arm that bound. Hitting the original inner timeout after a
+  valid extension is not a successful completed turn.
+- Timeout or interrupt after partial output remains timeout/cancelled. Partial
+  text must not be promoted into a completed `end_turn`.
+- Concurrent turns keep independent cancellation. Aborting turn A must not
+  cancel turn B.
+- A pre-aborted signal fails as cancelled.
+
+Acceptance is the frozen command
+`node --test checks/deadline-concurrent.test.mjs`.
diff --git a/benchmarks/qualification/inputs/acp-deadline-concurrent-cancel/checks/deadline-concurrent.test.mjs b/benchmarks/qualification/inputs/acp-deadline-concurrent-cancel/checks/deadline-concurrent.test.mjs
new file mode 100644
index 0000000..ec9689a
--- /dev/null
+++ b/benchmarks/qualification/inputs/acp-deadline-concurrent-cancel/checks/deadline-concurrent.test.mjs
@@ -0,0 +1,287 @@
+import assert from 'node:assert/strict';
+import { mkdir, mkdtemp, readFile, writeFile } from 'node:fs/promises';
+import { tmpdir } from 'node:os';
+import path from 'node:path';
+import test from 'node:test';
+
+import { runAcpTask } from '../plugins/codex-co-engineer/mcp/v3/acp-worker.mjs';
+import { nextDeadlineExtension } from '../plugins/codex-co-engineer/mcp/v3/deadline.mjs';
+import { createTask, readTask, updateTask } from '../plugins/codex-co-engineer/mcp/v3/task-store.mjs';
+
+async function writeDeadlineAgent(root, behavior) {
+  const agentPath = path.join(root, `deadline-agent-${behavior}.mjs`);
+  await writeFile(agentPath, `import { createInterface } from 'node:readline';
+import { writeFile } from 'node:fs/promises';
+import { join } from 'node:path';
+const behavior = ${JSON.stringify(behavior)};
+function send(message) { process.stdout.write(JSON.stringify(message) + '\\n'); }
+function response(id, result) { send({ jsonrpc: '2.0', id, result }); }
+const pending = new Map();
+async function handle(message) {
+  const { id, method, params = {} } = message;
+  if (method === 'initialize') {
+    return response(id, {
+      protocolVersion: 1,
+      agentCapabilities: { loadSession: false, sessionCapabilities: { close: {} } },
+    });
+  }
+  if (method === 'notifications/initialized' || method === 'initialized') return;
+  if (method === 'session/new') return response(id, { sessionId: 'deadline-session-' + behavior });
+  if (method === 'session/close') {
+    await writeFile(join(process.cwd(), '.acpx-fake-close.json'), JSON.stringify(params) + '\\n');
+    return response(id, {});
+  }
+  if (method === 'session/cancel') {
+    for (const [promptId, entry] of pending) {
+      if (entry.timer) clearTimeout(entry.timer);
+      response(promptId, { stopReason: 'cancelled' });
+      pending.delete(promptId);
+    }
+    return;
+  }
+  if (method === 'session/prompt') {
+    send({
+      jsonrpc: '2.0',
+      method: 'session/update',
+      params: {
+        sessionId: params.sessionId,
+        update: {
+          sessionUpdate: 'agent_message_chunk',
+          content: { type: 'text', text: 'partial-before-timeout' },
+        },
+      },
+    });
+    if (behavior === 'extend-complete') {
+      const timer = setTimeout(() => {
+        send({
+          jsonrpc: '2.0',
+          method: 'session/update',
+          params: {
+            sessionId: params.sessionId,
+            update: {
+              sessionUpdate: 'agent_message_chunk',
+              content: { type: 'text', text: '+done-after-extend' },
+            },
+          },
+        });
+        response(id, { stopReason: 'end_turn' });
+        pending.delete(id);
+      }, 1_500);
+      pending.set(id, { timer });
+      return;
+    }
+    if (behavior === 'slow-cooperative') {
+      const timer = setTimeout(() => {
+        response(id, { stopReason: 'end_turn' });
+        pending.delete(id);
+      }, 8_000);
+      pending.set(id, { timer });
+      return;
+    }
+    pending.set(id, { timer: null });
+    return;
+  }
+}
+const rl = createInterface({ input: process.stdin });
+rl.on('line', (line) => {
+  const trimmed = line.trim();
+  if (!trimmed) return;
+  handle(JSON.parse(trimmed)).catch((error) => {
+    process.stderr.write(String(error) + '\\n');
+  });
+});
+`);
+  return agentPath;
+}
+
+test('deadline extension is audited and refuses a silent roll after expiry', () => {
+  const task = {
+    status: 'running',
+    expected_duration_ms: 1000,
+    timeout_ms: 1200,
+    deadline_at: new Date(1_200).toISOString(),
+    deadline_source: 'margin',
+    deadline_extensions: [],
+  };
+  const extended = nextDeadlineExtension(task, {
+    expected_duration_ms: 3000,
+    reason: 'provider still making progress on tests',
+    now: 200,
+  });
+  assert.equal(extended.deadline_source, 'extended');
+  assert.equal(extended.timeout_ms, 3600);
+  assert.equal(Date.parse(extended.deadline_at), 3800);
+  assert.equal(extended.deadline_extensions.length, 1);
+
+  assert.throws(
+    () => nextDeadlineExtension(task, { expected_duration_ms: 5000, reason: 'too late', now: 3800 }),
+    (error) => error.code === 'deadline_expired',
+  );
+  assert.throws(
+    () => nextDeadlineExtension(task, { expected_duration_ms: 5000, now: 300 }),
+    (error) => error.code === 'invalid_extend_reason',
+  );
+  assert.throws(
+    () => nextDeadlineExtension({ ...task, deadline_at: new Date(3800).toISOString() }, {
+      expected_duration_ms: 1000,
+      reason: 'would shrink the recorded deadline',
+      now: 300,
+    }),
+    (error) => error.code === 'deadline_not_extended',
+  );
+});
+
+test('an in-flight turn is governed by the extended deadline, not the original inner timer', async () => {
+  const root = await mkdtemp(path.join(tmpdir(), 'ce-qual-deadline-extend-'));
+  const cwd = path.join(root, 'worktree');
+  await mkdir(cwd);
+  const agent = await writeDeadlineAgent(root, 'extend-complete');
+  const now = Date.now();
+  const taskId = 'deadline-extend-complete';
+  await createTask({
+    root,
+    prompt: 'finish after extension',
+    record: {
+      id: taskId,
+      status: 'accepted',
+      provider: 'grok',
+      cwd,
+      agent_argv: [process.execPath, agent],
+      timeout_ms: 700,
+      deadline_at: new Date(now + 700).toISOString(),
+    },
+  });
+  setTimeout(() => {
+    updateTask(root, taskId, {
+      deadline_at: new Date(Date.now() + 2_500).toISOString(),
+      timeout_ms: 2_500,
+      deadline_source: 'extended',
+      deadline_extensions: [{ reason: 'provider still making progress', at: new Date().toISOString() }],
+    }).catch(() => {});
+  }, 250);
+  const terminal = await runAcpTask({ root, taskId });
+  assert.equal(terminal.status, 'completed');
+  assert.equal(String(terminal.result).includes('done-after-extend'), true);
+});
+
+test('timeout after partial output is not promoted to a completed end_turn', async () => {
+  const root = await mkdtemp(path.join(tmpdir(), 'ce-qual-deadline-partial-'));
+  const cwd = path.join(root, 'worktree');
+  await mkdir(cwd);
+  const agent = await writeDeadlineAgent(root, 'partial-hostile');
+  const now = Date.now();
+  const taskId = 'deadline-extend-expire';
+  await createTask({
+    root,
+    prompt: 'expire at the new deadline',
+    record: {
+      id: taskId,
+      status: 'accepted',
+      provider: 'grok',
+      cwd,
+      agent_argv: [process.execPath, agent],
+      timeout_ms: 500,
+      deadline_at: new Date(now + 500).toISOString(),
+    },
+  });
+  setTimeout(() => {
+    updateTask(root, taskId, {
+      deadline_at: new Date(Date.now() + 800).toISOString(),
+      timeout_ms: 800,
+      deadline_source: 'extended',
+    }).catch(() => {});
+  }, 200);
+  const started = Date.now();
+  await assert.rejects(
+    runAcpTask({ root, taskId }),
+    (error) => error.code === 'timeout',
+  );
+  const elapsed = Date.now() - started;
+  assert.ok(elapsed >= 700, `expected expiry near the extended deadline, got ${elapsed}ms`);
+  assert.ok(elapsed < 2_500, `deadline watch should not wait on the original fixed turn timer drain (${elapsed}ms)`);
+  const { task } = await readTask(root, taskId);
+  assert.equal(task.status, 'timeout');
+  assert.notEqual(task.status, 'completed');
+  const events = await readFile(path.join(root, 'tasks', taskId, 'events.jsonl'), 'utf8');
+  assert.match(events, /partial-before-timeout/u);
+  assert.doesNotMatch(events, /"status":"completed"/u);
+});
+
+test('concurrent turns keep independent cancellation', async () => {
+  const root = await mkdtemp(path.join(tmpdir(), 'ce-qual-deadline-concurrent-'));
+  const cwdA = path.join(root, 'worktree-a');
+  const cwdB = path.join(root, 'worktree-b');
+  await mkdir(cwdA);
+  await mkdir(cwdB);
+  const agentA = await writeDeadlineAgent(root, 'slow-cooperative');
+  const agentBDir = path.join(root, 'b-agent');
+  await mkdir(agentBDir);
+  const agentB = await writeDeadlineAgent(agentBDir, 'slow-cooperative');
+  await createTask({
+    root,
+    prompt: 'turn A',
+    record: {
+      id: 'turn-a',
+      status: 'accepted',
+      provider: 'grok',
+      cwd: cwdA,
+      agent_argv: [process.execPath, agentA],
+      timeout_ms: 8_000,
+      deadline_at: new Date(Date.now() + 8_000).toISOString(),
+    },
+  });
+  await createTask({
+    root,
+    prompt: 'turn B',
+    record: {
+      id: 'turn-b',
+      status: 'accepted',
+      provider: 'grok',
+      cwd: cwdB,
+      agent_argv: [process.execPath, agentB],
+      timeout_ms: 8_000,
+      deadline_at: new Date(Date.now() + 8_000).toISOString(),
+    },
+  });
+  const abortA = new AbortController();
+  const abortB = new AbortController();
+  const runningA = runAcpTask({ root, taskId: 'turn-a', signal: abortA.signal });
+  const runningB = runAcpTask({ root, taskId: 'turn-b', signal: abortB.signal });
+  await new Promise((resolve) => setTimeout(resolve, 250));
+  abortA.abort();
+  await assert.rejects(runningA, (error) => error.code === 'cancelled');
+  const { task: taskB } = await readTask(root, 'turn-b');
+  assert.notEqual(taskB.status, 'cancelled');
+  abortB.abort();
+  try {
+    await runningB;
+  } catch {
+    // Turn B may still be running; abort is cleanup, not the assertion.
+  }
+});
+
+test('a pre-aborted signal cancels', async () => {
+  const root = await mkdtemp(path.join(tmpdir(), 'ce-qual-deadline-preabort-'));
+  const cwd = path.join(root, 'worktree');
+  await mkdir(cwd);
+  const agent = await writeDeadlineAgent(root, 'slow-cooperative');
+  await createTask({
+    root,
+    prompt: 'already cancelled',
+    record: {
+      id: 'pre-abort',
+      status: 'accepted',
+      provider: 'grok',
+      cwd,
+      agent_argv: [process.execPath, agent],
+      timeout_ms: 5_000,
+      deadline_at: new Date(Date.now() + 5_000).toISOString(),
+    },
+  });
+  const abort = new AbortController();
+  abort.abort();
+  await assert.rejects(
+    runAcpTask({ root, taskId: 'pre-abort', signal: abort.signal }),
+    (error) => error.code === 'cancelled',
+  );
+});
diff --git a/benchmarks/qualification/inputs/comparison-failed-helper-cumulative/TASK.md b/benchmarks/qualification/inputs/comparison-failed-helper-cumulative/TASK.md
new file mode 100644
index 0000000..1cbeb86
--- /dev/null
+++ b/benchmarks/qualification/inputs/comparison-failed-helper-cumulative/TASK.md
@@ -0,0 +1,33 @@
+# Failed, helper, and cumulative comparison accounting
+
+This retrospective task uses a bounded pre-fix snapshot of public repository
+source. Repair the historical modules at their original paths so the frozen
+checks in `checks/failed-helper-cumulative.test.mjs` pass.
+
+Do not edit the check file, this prompt, or recorded identity. Do not copy
+later corrected sources, Git history, or other trial outputs into the
+workspace.
+
+Required behavior:
+
+- Count every attempt, including failed attempts, corrections, and native
+  helpers. Failed attempts remain in the usage-per-accepted numerator.
+- If any trial in the arm is missing `accepted`, usage-per-accepted and the
+  acceptance rate stay unknown until coverage is complete. Zero accepted is
+  not zero cost.
+- Unknown metrics stay unknown. Missing primary evidence is inconclusive, not
+  measured zero.
+- `elapsed_ms` is the sum of attempt durations. `wall_elapsed_ms` is trial
+  wall time and is not that sum.
+- When native helpers are recorded separately, the parent must set
+  `native_parent_excludes_helpers: true`. Helper usage is added once.
+- Duplicate `attempt_id` values are compatible cumulative snapshots only when
+  kind, provider/model, and terminal outcome stay consistent, sequence
+  increases, and usage is monotone. A later snapshot cannot turn a terminal
+  failure into acceptance or move reported usage onto another model.
+- Provider tokens and cost stay grouped by provider and model. Mixed
+  provider/model totals are unknown/non-comparable, not one blended number.
+- An arm cannot mix `coengineer_source` identities.
+
+Acceptance is the frozen command
+`node --test checks/failed-helper-cumulative.test.mjs`.
diff --git a/benchmarks/qualification/inputs/comparison-failed-helper-cumulative/checks/failed-helper-cumulative.test.mjs b/benchmarks/qualification/inputs/comparison-failed-helper-cumulative/checks/failed-helper-cumulative.test.mjs
new file mode 100644
index 0000000..6d5aa0b
--- /dev/null
+++ b/benchmarks/qualification/inputs/comparison-failed-helper-cumulative/checks/failed-helper-cumulative.test.mjs
@@ -0,0 +1,345 @@
+import assert from 'node:assert/strict';
+import { createHash } from 'node:crypto';
+import test from 'node:test';
+
+import { canonicalJsonStringify } from '../plugins/codex-co-engineer/mcp/v3/identity.mjs';
+import {
+  compareTrials,
+  parseTrial,
+} from '../scripts/compare-coengineer-runs.mjs';
+
+const CASE_SCHEMA = 'codex-co-engineer.benchmark-case.v1';
+const TRIAL_SCHEMA = 'codex-co-engineer.benchmark-trial.v1';
+const BASE_SHA = 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa';
+const CANDIDATE_COMMIT = 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb';
+const OTHER_COMMIT = 'cccccccccccccccccccccccccccccccccccccccc';
+const INPUT_DIGEST_DOMAIN = 'codex-co-engineer.benchmark-input.v1';
+
+function settings() {
+  return { reasoning: 'high', sandbox: 'workspace-write' };
+}
+
+function metric(value, source = 'host_measured') {
+  return {
+    value,
+    source,
+    trust: source === 'provider_report' ? 'provider_untrusted' : 'host_authoritative',
+  };
+}
+
+function unknownMetric() {
+  return { value: null, source: 'unknown', trust: 'unknown' };
+}
+
+function frozenCase() {
+  const files = { 'TASK.md': '# accounting\n' };
+  const acceptance = { checks: [{ id: 'unit' }] };
+  return {
+    schema: CASE_SCHEMA,
+    id: 'accounting-case',
+    title: 'accounting',
+    summary: 'failed helper cumulative accounting',
+    base_sha: BASE_SHA,
+    input_digest: createHash('sha256')
+      .update(INPUT_DIGEST_DOMAIN, 'utf8')
+      .update('\n', 'utf8')
+      .update(canonicalJsonStringify({ files, acceptance }), 'utf8')
+      .digest('hex'),
+    comparable: {
+      host_model: 'recorded-host-model',
+      host_settings: settings(),
+      provider_configuration: { implement: 'grok', review: 'cursor-local' },
+    },
+    inputs: { files },
+    acceptance,
+  };
+}
+
+function trial(overrides = {}) {
+  const arm = overrides.arm ?? 'candidate-3.4.3';
+  const caseRecord = frozenCase();
+  return {
+    schema: TRIAL_SCHEMA,
+    trial_id: overrides.trial_id ?? 'trial-one',
+    case_id: 'accounting-case',
+    arm,
+    base_sha: BASE_SHA,
+    input_digest: caseRecord.input_digest,
+    coengineer_source: arm === 'native-codex'
+      ? { kind: 'native', value: 'native-codex' }
+      : { kind: 'git_commit', value: CANDIDATE_COMMIT },
+    host_model: 'recorded-host-model',
+    host_settings: settings(),
+    provider_configuration: arm === 'native-codex'
+      ? { implement: 'native' }
+      : { implement: 'grok', review: 'cursor-local' },
+    accepted: true,
+    wall_elapsed_ms: metric(1000),
+    attempts: [{
+      attempt_id: 'attempt-one',
+      kind: 'initial',
+      outcome: 'accepted',
+      usage: { native_input_tokens: metric(10), elapsed_ms: metric(1000) },
+    }],
+    ...overrides,
+  };
+}
+
+function armRow(trials, arm = 'candidate-3.4.3') {
+  const comparison = compareTrials([frozenCase()], trials);
+  return comparison.cases[0].arms[arm];
+}
+
+test('failed attempts remain in the usage-per-accepted numerator', () => {
+  const row = armRow([trial({
+    trial_id: 'fail-then-pass',
+    accepted: true,
+    attempts: [
+      {
+        attempt_id: 'first',
+        kind: 'initial',
+        outcome: 'failed',
+        usage: { native_input_tokens: metric(10), elapsed_ms: metric(1000) },
+      },
+      {
+        attempt_id: 'second',
+        kind: 'correction',
+        outcome: 'accepted',
+        usage: { native_input_tokens: metric(15), elapsed_ms: metric(2000) },
+      },
+    ],
+  })]);
+  assert.equal(row.accepted_count, 1);
+  assert.equal(row.failed_attempt_count, 1);
+  assert.equal(row.correction_count, 1);
+  assert.equal(row.usage.native_input_tokens.value, 25);
+  assert.equal(row.usage_per_accepted_result.native_input_tokens.value, 25);
+  assert.equal(row.usage_per_accepted_result.native_input_tokens.numerator, 25);
+  assert.match(String(row.usage_per_accepted_result.native_input_tokens.reason), /failed/u);
+});
+
+test('mixed known and unknown acceptance leaves usage-per-accepted unknown', () => {
+  const missing = structuredClone(trial({ trial_id: 'missing-accept' }));
+  delete missing.accepted;
+  missing.attempts = [{
+    attempt_id: 'maybe',
+    kind: 'initial',
+    outcome: 'uncertain',
+    usage: { native_input_tokens: metric(7) },
+  }];
+  const compared = armRow([
+    trial({ trial_id: 'known-accept' }),
+    missing,
+  ]);
+  assert.equal(compared.accepted_count, 1);
+  assert.equal(compared.usage.native_input_tokens.value, 17);
+  const per = compared.usage_per_accepted_result.native_input_tokens;
+  assert.equal(per.value, null);
+  assert.equal(per.reason, 'incomplete_acceptance_coverage');
+  assert.equal(per.numerator, 17);
+  assert.equal(compared.acceptance_rate.value, null);
+});
+
+test('zero acceptance is not zero cost and unknown is not measured zero', () => {
+  const row = armRow([trial({
+    trial_id: 'zero-accept',
+    accepted: false,
+    attempts: [{
+      attempt_id: 'only',
+      kind: 'initial',
+      outcome: 'failed',
+      usage: {
+        native_input_tokens: metric(9),
+        native_output_tokens: unknownMetric(),
+      },
+    }],
+  })]);
+  assert.equal(row.accepted_count, 0);
+  assert.equal(row.usage.native_input_tokens.value, 9);
+  assert.equal(row.usage_per_accepted_result.native_input_tokens.value, null);
+  assert.equal(row.usage_per_accepted_result.native_input_tokens.reason, 'zero_accepted_not_zero_cost');
+  assert.equal(row.usage.native_output_tokens.value, null);
+  assert.equal(row.usage.native_output_tokens.source, 'unknown');
+  assert.notEqual(row.usage.native_output_tokens.value, 0);
+});
+
+test('native helpers are counted once and parent usage must exclude them', () => {
+  assert.throws(() => parseTrial(trial({
+    trial_id: 'parent-plus-helper',
+    attempts: [
+      {
+        attempt_id: 'parent',
+        kind: 'initial',
+        outcome: 'accepted',
+        usage: { native_input_tokens: metric(11), elapsed_ms: metric(600) },
+      },
+      {
+        attempt_id: 'helper',
+        kind: 'native_helper',
+        outcome: 'accepted',
+        usage: { native_helper_calls: metric(1), native_input_tokens: metric(4), elapsed_ms: metric(200) },
+      },
+    ],
+  })), (error) => error.code === 'identity_mismatch');
+
+  const row = armRow([trial({
+    trial_id: 'excluded-parent',
+    native_parent_excludes_helpers: true,
+    wall_elapsed_ms: metric(800),
+    attempts: [
+      {
+        attempt_id: 'parent',
+        kind: 'initial',
+        outcome: 'accepted',
+        usage: { native_input_tokens: metric(11), elapsed_ms: metric(600) },
+      },
+      {
+        attempt_id: 'helper',
+        kind: 'native_helper',
+        outcome: 'accepted',
+        usage: { native_helper_calls: metric(1), native_input_tokens: metric(4), elapsed_ms: metric(200) },
+      },
+    ],
+  })]);
+  assert.equal(row.native_helper_count, 1);
+  assert.equal(row.usage.native_input_tokens.value, 15);
+  assert.equal(row.usage.elapsed_ms.value, 800);
+  assert.equal(row.usage.elapsed_ms.role, 'attempt_duration_sum');
+  assert.equal(row.usage.wall_elapsed_ms.value, 800);
+  assert.equal(row.usage.wall_elapsed_ms.role, 'trial_wall_elapsed');
+});
+
+test('elapsed_ms is attempt sum and wall_elapsed_ms is trial wall time', () => {
+  const row = armRow([trial({
+    trial_id: 'wall-vs-sum',
+    wall_elapsed_ms: metric(4000),
+    attempts: [
+      {
+        attempt_id: 'first',
+        kind: 'initial',
+        outcome: 'failed',
+        usage: { elapsed_ms: metric(1000) },
+      },
+      {
+        attempt_id: 'second',
+        kind: 'correction',
+        outcome: 'accepted',
+        usage: { elapsed_ms: metric(2500) },
+      },
+    ],
+  })]);
+  assert.equal(row.usage.elapsed_ms.value, 3500);
+  assert.equal(row.usage.elapsed_ms.role, 'attempt_duration_sum');
+  assert.equal(row.usage.wall_elapsed_ms.value, 4000);
+  assert.equal(row.usage.wall_elapsed_ms.role, 'trial_wall_elapsed');
+  assert.notEqual(row.usage.wall_elapsed_ms.value, row.usage.elapsed_ms.value);
+});
+
+test('duplicate attempt IDs keep the latest compatible cumulative snapshot', () => {
+  const ok = parseTrial(trial({
+    trial_id: 'cumulative-ok',
+    attempts: [
+      {
+        attempt_id: 'same',
+        kind: 'initial',
+        outcome: 'failed',
+        sequence: 1,
+        usage: { native_input_tokens: metric(10) },
+      },
+      {
+        attempt_id: 'same',
+        kind: 'initial',
+        outcome: 'failed',
+        sequence: 2,
+        usage: { native_input_tokens: metric(18) },
+      },
+    ],
+  }));
+  assert.equal(ok.attempts.length, 1);
+  assert.equal(ok.attempts[0].usage.native_input_tokens.value, 18);
+
+  assert.throws(() => parseTrial(trial({
+    trial_id: 'flip-terminal',
+    attempts: [
+      {
+        attempt_id: 'same',
+        kind: 'initial',
+        outcome: 'failed',
+        sequence: 1,
+        usage: { native_input_tokens: metric(10) },
+      },
+      {
+        attempt_id: 'same',
+        kind: 'initial',
+        outcome: 'accepted',
+        sequence: 2,
+        usage: { native_input_tokens: metric(18) },
+      },
+    ],
+  })), (error) => error.code === 'incompatible_snapshot' || error.code === 'duplicate_attempt_id');
+
+  assert.throws(() => parseTrial(trial({
+    trial_id: 'move-model',
+    attempts: [
+      {
+        attempt_id: 'provider-attempt',
+        sequence: 1,
+        kind: 'initial',
+        outcome: 'unfinal',
+        provider: 'grok',
+        model: 'model-a',
+        usage: { provider_output_tokens: metric(20, 'provider_report') },
+      },
+      {
+        attempt_id: 'provider-attempt',
+        sequence: 2,
+        kind: 'initial',
+        outcome: 'unfinal',
+        provider: 'grok',
+        model: 'model-b',
+        usage: { provider_output_tokens: metric(20, 'provider_report') },
+      },
+    ],
+  })), (error) => error.code === 'incompatible_snapshot' || error.code === 'duplicate_attempt_id');
+});
+
+test('mixed providers keep groups and make aggregate tokens non-comparable', () => {
+  const row = armRow([trial({
+    trial_id: 'two-providers',
+    attempts: [
+      {
+        attempt_id: 'grok-arm',
+        kind: 'initial',
+        outcome: 'completed_unaccepted',
+        provider: 'grok',
+        model: 'grok-4',
+        usage: { provider_input_tokens: metric(40, 'provider_report') },
+      },
+      {
+        attempt_id: 'cursor-arm',
+        kind: 'correction',
+        outcome: 'accepted',
+        provider: 'cursor-local',
+        model: 'composer',
+        usage: { provider_input_tokens: metric(15, 'provider_report') },
+      },
+    ],
+  })]);
+  const grouped = row.usage.provider_input_tokens;
+  assert.equal(grouped.value, null);
+  assert.equal(grouped.reason, 'mixed_providers_non_comparable');
+  assert.equal(grouped.groups.length, 2);
+});
+
+test('an arm cannot mix coengineer_source identities', () => {
+  assert.throws(() => compareTrials([frozenCase()], [
+    trial({
+      trial_id: 'build-a',
+      coengineer_source: { kind: 'git_commit', value: CANDIDATE_COMMIT },
+    }),
+    trial({
+      trial_id: 'build-b',
+      coengineer_source: { kind: 'git_commit', value: OTHER_COMMIT },
+    }),
+  ]), (error) => error.code === 'mixed_candidate_identity');
+});
diff --git a/benchmarks/qualification/inputs/run-result-outcome-acceptance/TASK.md b/benchmarks/qualification/inputs/run-result-outcome-acceptance/TASK.md
new file mode 100644
index 0000000..f1dc872
--- /dev/null
+++ b/benchmarks/qualification/inputs/run-result-outcome-acceptance/TASK.md
@@ -0,0 +1,31 @@
+# Run-result outcome and acceptance
+
+This retrospective task uses a bounded pre-fix snapshot of public repository
+source. Repair the historical modules at their original paths so the frozen
+checks in `checks/run-result-outcome.test.mjs` pass.
+
+Do not edit the check file, this prompt, or recorded identity. Do not copy
+later corrected sources, Git history, or other trial outputs into the
+workspace.
+
+Required behavior:
+
+- A completed provider job is not Codex acceptance. `codex_accepted` is true
+  only when the assignment result is completed and a Codex acceptance record is
+  bound to this run id and the exact candidate head.
+- Failed, uncertain, and unfinal remain distinct. A failed run stays failed
+  even when a lane completed and produced a head. Uncertain proof
+  (`lifecycle_pending`, unknown dispatch confidence, dirty handoff) is not
+  completed. A still-running lane keeps the result unfinal.
+- Completed verify work is not a passed check. Checks stay empty unless an
+  explicit check record is supplied.
+- Independent lane heads are not one composed candidate. Report a candidate
+  head only for a single lane or an explicit composed=true override.
+- Missing metrics stay unknown. Do not emit numeric zero for absent usage.
+- Shareable text must not leak owner-only prompts, worktree paths, or internal
+  tokens such as `not_accepted`.
+- Stale or unbound Codex acceptance cannot label the result Accepted. A bound
+  acceptance still cannot accept a failed assignment result.
+
+Acceptance is the frozen command
+`node --test checks/run-result-outcome.test.mjs`.
diff --git a/benchmarks/qualification/inputs/run-result-outcome-acceptance/checks/run-result-outcome.test.mjs b/benchmarks/qualification/inputs/run-result-outcome-acceptance/checks/run-result-outcome.test.mjs
new file mode 100644
index 0000000..83f46b4
--- /dev/null
+++ b/benchmarks/qualification/inputs/run-result-outcome-acceptance/checks/run-result-outcome.test.mjs
@@ -0,0 +1,314 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import { ARTIFACT_REF_SCHEMA_ID } from '../plugins/codex-co-engineer/mcp/v3/artifact-ref.mjs';
+import {
+  RUN_ADMISSION_RECEIPT_SCHEMA_ID,
+  RUN_RESULT_EVIDENCE_SCHEMA_ID,
+  detailRunResultEvidenceV1,
+  projectRunResultEvidenceV1,
+  summarizeRunResultEvidenceV1,
+} from '../plugins/codex-co-engineer/mcp/v3/run-result-evidence.mjs';
+
+const RUN_ID = 'run-result-01';
+const BASE_SHA = 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa';
+const HEAD_SHA = 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb';
+const OTHER_HEAD = 'cccccccccccccccccccccccccccccccccccccccc';
+const HOSTILE_PATH = '/tmp/secret-repo-do-not-leak';
+const HOSTILE_PROMPT = 'owner-only prompt with secret token';
+
+function artifactRef() {
+  return {
+    schema: ARTIFACT_REF_SCHEMA_ID,
+    run_id: RUN_ID,
+    assignment_id: 'lane-writer',
+    artifact_kind: 'git_diff',
+    artifact_class: 'sanitized',
+    relative_path: `runs/${RUN_ID}/lane-writer/diff-1.patch`,
+    byte_length: 128,
+    sha256: 'ab'.repeat(32),
+    media_type: 'text/plain',
+    content_encoding: 'identity',
+  };
+}
+
+function writerLane(overrides = {}) {
+  return {
+    assignment_id: 'lane-writer',
+    provider: 'grok',
+    role: 'implement',
+    required: true,
+    phase: 'completed',
+    status: 'completed',
+    prompt_dispatched: true,
+    dispatch_confidence: 'authoritative',
+    task_final: true,
+    clean: true,
+    head: HEAD_SHA,
+    result: HOSTILE_PROMPT,
+    handoff: {
+      worktree: HOSTILE_PATH,
+      current_head: HEAD_SHA,
+      branch: 'ce/lane-writer',
+    },
+    artifact_refs: [artifactRef()],
+    ...overrides,
+  };
+}
+
+function receipt(overrides = {}) {
+  const result = {
+    schema: RUN_ADMISSION_RECEIPT_SCHEMA_ID,
+    version: 1,
+    run_id: RUN_ID,
+    phase: 'completed',
+    status: 'completed',
+    base_sha: BASE_SHA,
+    git: { base_sha: BASE_SHA, digest: 'sha256:not-copied' },
+    objective: HOSTILE_PROMPT,
+    complete_candidate_blocked: false,
+    lanes: [writerLane()],
+    ...overrides,
+  };
+  return {
+    ...result,
+    lanes: result.lanes.map((lane) => ({
+      prompt_dispatched: true,
+      dispatch_confidence: 'authoritative',
+      task_final: true,
+      clean: true,
+      ...lane,
+    })),
+  };
+}
+
+test('completed admission work is not Codex acceptance', () => {
+  const summary = summarizeRunResultEvidenceV1(receipt());
+  assert.equal(summary.schema, RUN_RESULT_EVIDENCE_SCHEMA_ID);
+  assert.equal(summary.assignment_result, 'completed');
+  assert.equal(summary.codex_accepted, false);
+  assert.equal(summary.review_needed, true);
+  assert.equal(summary.next_decision, 'review_candidate');
+  assert.equal(summary.candidate.head, HEAD_SHA);
+  assert.match(summary.text, /needs review/iu);
+  assert.equal(summary.text.includes('not_accepted'), false);
+});
+
+test('failed, uncertain, and unfinal states stay distinct', () => {
+  const failed = summarizeRunResultEvidenceV1(receipt({
+    phase: 'failed',
+    status: 'failed',
+    lanes: [writerLane({
+      phase: 'failed_pre_prompt',
+      status: 'failed_pre_prompt',
+      head: null,
+    })],
+  }));
+  assert.equal(failed.assignment_result, 'failed');
+  assert.equal(failed.next_decision, 'resolve_failures');
+  assert.equal(failed.codex_accepted, false);
+
+  const uncertain = summarizeRunResultEvidenceV1(receipt({
+    phase: 'needs_attention',
+    status: 'needs_attention',
+    lanes: [writerLane({
+      phase: 'needs_attention',
+      status: 'needs_attention',
+      dispatch_confidence: 'uncertain',
+    })],
+  }));
+  assert.equal(uncertain.assignment_result, 'uncertain');
+  assert.equal(uncertain.unresolved, true);
+  assert.equal(uncertain.next_decision, 'inspect_unresolved');
+
+  const unfinal = summarizeRunResultEvidenceV1(receipt({
+    phase: 'running',
+    status: 'running',
+    lanes: [writerLane({
+      phase: 'running',
+      status: 'running',
+    })],
+  }));
+  assert.equal(unfinal.assignment_result, 'unfinal');
+  assert.equal(unfinal.next_decision, 'wait_for_completion');
+});
+
+test('mismatched run and lane states stay coherent', () => {
+  const failedWithOutput = summarizeRunResultEvidenceV1(receipt({
+    phase: 'failed',
+    status: 'failed',
+    lanes: [writerLane()],
+  }));
+  assert.equal(failedWithOutput.assignment_result, 'failed');
+  assert.equal(failedWithOutput.label, 'Failed');
+  assert.equal(failedWithOutput.next_decision, 'resolve_failures');
+  assert.equal(failedWithOutput.review_needed, false);
+
+  const pending = summarizeRunResultEvidenceV1(receipt({
+    phase: 'lifecycle_pending',
+    status: 'lifecycle_pending',
+    lanes: [writerLane({ task_final: false })],
+  }));
+  assert.equal(pending.assignment_result, 'uncertain');
+  assert.equal(pending.next_decision, 'inspect_unresolved');
+
+  const unknownProof = summarizeRunResultEvidenceV1(receipt({
+    lanes: [writerLane({ dispatch_confidence: 'unknown' })],
+  }));
+  assert.equal(unknownProof.assignment_result, 'uncertain');
+
+  const dirty = summarizeRunResultEvidenceV1(receipt({
+    lanes: [writerLane({ clean: false })],
+  }));
+  assert.equal(dirty.assignment_result, 'uncertain');
+
+  const stillRunning = summarizeRunResultEvidenceV1(receipt({
+    phase: 'running',
+    status: 'running',
+    lanes: [
+      writerLane(),
+      {
+        assignment_id: 'lane-reviewer',
+        provider: 'cursor-local',
+        role: 'review',
+        required: false,
+        phase: 'running',
+        status: 'running',
+      },
+    ],
+  }));
+  assert.equal(stillRunning.assignment_result, 'unfinal');
+  assert.match(stillRunning.text, /in progress/iu);
+});
+
+test('completed verify work is not treated as a passed check', () => {
+  const detailed = detailRunResultEvidenceV1(receipt({
+    lanes: [{
+      assignment_id: 'lane-verify',
+      provider: 'grok',
+      role: 'verify',
+      required: true,
+      phase: 'completed',
+      status: 'completed',
+      prompt_dispatched: true,
+      dispatch_confidence: 'authoritative',
+      task_final: true,
+      clean: true,
+      head: HEAD_SHA,
+    }],
+  }));
+  assert.equal(detailed.assignment_result, 'completed');
+  assert.equal(detailed.assignments[0].role, 'verify');
+  assert.equal(detailed.assignments[0].outcome, 'completed');
+  assert.equal(detailed.checks.length, 0);
+  assert.equal(detailed.codex_accepted, false);
+  assert.equal(detailed.review_needed, true);
+});
+
+test('candidate heads stay unambiguous and composition must be explicit', () => {
+  const mixed = summarizeRunResultEvidenceV1(receipt({
+    lanes: [
+      writerLane(),
+      {
+        assignment_id: 'lane-docs',
+        provider: 'cursor-local',
+        role: 'implement',
+        required: true,
+        phase: 'completed',
+        status: 'completed',
+        prompt_dispatched: true,
+        dispatch_confidence: 'authoritative',
+        task_final: true,
+        clean: true,
+        head: OTHER_HEAD,
+      },
+    ],
+  }));
+  assert.equal(mixed.candidate.head, null);
+  assert.equal(mixed.candidate.composed, false);
+
+  const composed = projectRunResultEvidenceV1({
+    receipt: receipt({
+      lanes: [
+        writerLane(),
+        {
+          assignment_id: 'lane-docs',
+          provider: 'cursor-local',
+          role: 'implement',
+          required: true,
+          phase: 'completed',
+          status: 'completed',
+          prompt_dispatched: true,
+          dispatch_confidence: 'authoritative',
+          task_final: true,
+          clean: true,
+          head: OTHER_HEAD,
+        },
+      ],
+    }),
+    candidate: {
+      head: HEAD_SHA,
+      composed: true,
+    },
+  });
+  assert.equal(composed.candidate.head, HEAD_SHA);
+  assert.equal(composed.candidate.composed, true);
+});
+
+test('missing metrics stay unknown and shareable text omits owner-only data', () => {
+  const missing = summarizeRunResultEvidenceV1(receipt());
+  assert.equal(missing.usage.present, false);
+  assert.equal(JSON.stringify(missing.usage).includes('"value":0'), false);
+  assert.equal(missing.text.includes(HOSTILE_PATH), false);
+  assert.equal(missing.text.includes(HOSTILE_PROMPT), false);
+  assert.equal(missing.text.includes('/tmp/'), false);
+  assert.equal(missing.text.includes('not_accepted'), false);
+});
+
+test('unbound or stale Codex acceptance cannot label Accepted', () => {
+  const flagOnly = projectRunResultEvidenceV1({
+    receipt: receipt(),
+    codex_acceptance: { accepted: true, authority: 'codex' },
+  });
+  assert.equal(flagOnly.codex_accepted, false);
+  assert.equal(flagOnly.label, 'Review needed');
+
+  const stale = projectRunResultEvidenceV1({
+    receipt: receipt(),
+    codex_acceptance: {
+      accepted: true,
+      authority: 'codex',
+      run_id: RUN_ID,
+      head: OTHER_HEAD,
+    },
+  });
+  assert.equal(stale.codex_accepted, false);
+
+  const bound = projectRunResultEvidenceV1({
+    receipt: receipt(),
+    codex_acceptance: {
+      accepted: true,
+      authority: 'codex',
+      run_id: RUN_ID,
+      head: HEAD_SHA,
+    },
+  });
+  assert.equal(bound.codex_accepted, true);
+  assert.equal(bound.label, 'Accepted');
+
+  const failed = projectRunResultEvidenceV1({
+    receipt: receipt({
+      phase: 'failed',
+      status: 'failed',
+      lanes: [writerLane({ phase: 'failed', status: 'failed' })],
+    }),
+    codex_acceptance: {
+      accepted: true,
+      authority: 'codex',
+      run_id: RUN_ID,
+      head: HEAD_SHA,
+    },
+  });
+  assert.equal(failed.codex_accepted, false);
+  assert.equal(failed.label, 'Failed');
+});
diff --git a/benchmarks/qualification/operator-manifest.json b/benchmarks/qualification/operator-manifest.json
new file mode 100644
index 0000000..d221a35
--- /dev/null
+++ b/benchmarks/qualification/operator-manifest.json
@@ -0,0 +1,287 @@
+{
+  "schema": "codex-co-engineer.qualification-manifest.v1",
+  "version": 1,
+  "status": "unrun",
+  "title": "Operator schedule for 3.4.3 retrospective qualification",
+  "note": "All 24 trials are unrun retrospective cases. Do not treat this manifest as measured evidence. Candidate and published SHAs are bound in the external execution manifest, not here.",
+  "assignments": {
+    "acp-deadline-concurrent-cancel": {
+      "implement": {
+        "provider": "cursor-local"
+      },
+      "review": {
+        "provider": "grok"
+      }
+    },
+    "run-result-outcome-acceptance": {
+      "implement": {
+        "provider": "grok"
+      },
+      "review": {
+        "provider": "cursor-local"
+      }
+    },
+    "comparison-failed-helper-cumulative": {
+      "implement": {
+        "provider": "grok"
+      },
+      "review": {
+        "provider": "cursor-local"
+      }
+    }
+  },
+  "paid_ceiling_usd": 25,
+  "live_jobs": "not_implemented",
+  "ordering": {
+    "seed": 43,
+    "algorithm": "mulberry32-fisher-yates-grouped-by-case-rep-then-approach-positions",
+    "trial_count": 24
+  },
+  "schedule": [
+    {
+      "trial_id": "comparison-failed-helper-cumulative-published-3-4-2-r1",
+      "case_id": "comparison-failed-helper-cumulative",
+      "arm": "published-3.4.2",
+      "rep": 1,
+      "implement": "grok",
+      "review": "cursor-local",
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "comparison-failed-helper-cumulative-direct-delegation-r1",
+      "case_id": "comparison-failed-helper-cumulative",
+      "arm": "direct-delegation",
+      "rep": 1,
+      "implement": "grok",
+      "review": "cursor-local",
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "comparison-failed-helper-cumulative-native-codex-r1",
+      "case_id": "comparison-failed-helper-cumulative",
+      "arm": "native-codex",
+      "rep": 1,
+      "implement": "native",
+      "review": null,
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "comparison-failed-helper-cumulative-candidate-3-4-3-r1",
+      "case_id": "comparison-failed-helper-cumulative",
+      "arm": "candidate-3.4.3",
+      "rep": 1,
+      "implement": "grok",
+      "review": "cursor-local",
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "run-result-outcome-acceptance-published-3-4-2-r2",
+      "case_id": "run-result-outcome-acceptance",
+      "arm": "published-3.4.2",
+      "rep": 2,
+      "implement": "grok",
+      "review": "cursor-local",
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "run-result-outcome-acceptance-candidate-3-4-3-r2",
+      "case_id": "run-result-outcome-acceptance",
+      "arm": "candidate-3.4.3",
+      "rep": 2,
+      "implement": "grok",
+      "review": "cursor-local",
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "run-result-outcome-acceptance-native-codex-r2",
+      "case_id": "run-result-outcome-acceptance",
+      "arm": "native-codex",
+      "rep": 2,
+      "implement": "native",
+      "review": null,
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "run-result-outcome-acceptance-direct-delegation-r2",
+      "case_id": "run-result-outcome-acceptance",
+      "arm": "direct-delegation",
+      "rep": 2,
+      "implement": "grok",
+      "review": "cursor-local",
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "acp-deadline-concurrent-cancel-published-3-4-2-r1",
+      "case_id": "acp-deadline-concurrent-cancel",
+      "arm": "published-3.4.2",
+      "rep": 1,
+      "implement": "cursor-local",
+      "review": "grok",
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "acp-deadline-concurrent-cancel-native-codex-r1",
+      "case_id": "acp-deadline-concurrent-cancel",
+      "arm": "native-codex",
+      "rep": 1,
+      "implement": "native",
+      "review": null,
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "acp-deadline-concurrent-cancel-candidate-3-4-3-r1",
+      "case_id": "acp-deadline-concurrent-cancel",
+      "arm": "candidate-3.4.3",
+      "rep": 1,
+      "implement": "cursor-local",
+      "review": "grok",
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "acp-deadline-concurrent-cancel-direct-delegation-r1",
+      "case_id": "acp-deadline-concurrent-cancel",
+      "arm": "direct-delegation",
+      "rep": 1,
+      "implement": "cursor-local",
+      "review": "grok",
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "run-result-outcome-acceptance-direct-delegation-r1",
+      "case_id": "run-result-outcome-acceptance",
+      "arm": "direct-delegation",
+      "rep": 1,
+      "implement": "grok",
+      "review": "cursor-local",
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "run-result-outcome-acceptance-candidate-3-4-3-r1",
+      "case_id": "run-result-outcome-acceptance",
+      "arm": "candidate-3.4.3",
+      "rep": 1,
+      "implement": "grok",
+      "review": "cursor-local",
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "run-result-outcome-acceptance-native-codex-r1",
+      "case_id": "run-result-outcome-acceptance",
+      "arm": "native-codex",
+      "rep": 1,
+      "implement": "native",
+      "review": null,
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "run-result-outcome-acceptance-published-3-4-2-r1",
+      "case_id": "run-result-outcome-acceptance",
+      "arm": "published-3.4.2",
+      "rep": 1,
+      "implement": "grok",
+      "review": "cursor-local",
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "acp-deadline-concurrent-cancel-native-codex-r2",
+      "case_id": "acp-deadline-concurrent-cancel",
+      "arm": "native-codex",
+      "rep": 2,
+      "implement": "native",
+      "review": null,
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "acp-deadline-concurrent-cancel-published-3-4-2-r2",
+      "case_id": "acp-deadline-concurrent-cancel",
+      "arm": "published-3.4.2",
+      "rep": 2,
+      "implement": "cursor-local",
+      "review": "grok",
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "acp-deadline-concurrent-cancel-direct-delegation-r2",
+      "case_id": "acp-deadline-concurrent-cancel",
+      "arm": "direct-delegation",
+      "rep": 2,
+      "implement": "cursor-local",
+      "review": "grok",
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "acp-deadline-concurrent-cancel-candidate-3-4-3-r2",
+      "case_id": "acp-deadline-concurrent-cancel",
+      "arm": "candidate-3.4.3",
+      "rep": 2,
+      "implement": "cursor-local",
+      "review": "grok",
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "comparison-failed-helper-cumulative-candidate-3-4-3-r2",
+      "case_id": "comparison-failed-helper-cumulative",
+      "arm": "candidate-3.4.3",
+      "rep": 2,
+      "implement": "grok",
+      "review": "cursor-local",
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "comparison-failed-helper-cumulative-published-3-4-2-r2",
+      "case_id": "comparison-failed-helper-cumulative",
+      "arm": "published-3.4.2",
+      "rep": 2,
+      "implement": "grok",
+      "review": "cursor-local",
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "comparison-failed-helper-cumulative-direct-delegation-r2",
+      "case_id": "comparison-failed-helper-cumulative",
+      "arm": "direct-delegation",
+      "rep": 2,
+      "implement": "grok",
+      "review": "cursor-local",
+      "status": "unrun",
+      "retrospective": true
+    },
+    {
+      "trial_id": "comparison-failed-helper-cumulative-native-codex-r2",
+      "case_id": "comparison-failed-helper-cumulative",
+      "arm": "native-codex",
+      "rep": 2,
+      "implement": "native",
+      "review": null,
+      "status": "unrun",
+      "retrospective": true
+    }
+  ],
+  "unrun_case_ids": [
+    "acp-deadline-concurrent-cancel",
+    "run-result-outcome-acceptance",
+    "comparison-failed-helper-cumulative"
+  ]
+}
diff --git a/benchmarks/qualification/precollection-manifest.json b/benchmarks/qualification/precollection-manifest.json
new file mode 100644
index 0000000..2d4706e
--- /dev/null
+++ b/benchmarks/qualification/precollection-manifest.json
@@ -0,0 +1,27 @@
+{
+  "schema": "codex-co-engineer.qualification-execution-manifest.v1",
+  "version": 1,
+  "status": "unrecorded",
+  "note": "Record actual Astra host model gpt-6-astra, effective settings, and exact per-case {provider,model} routes before collection. Native has no external jobs but uses the same planned host config. Never invent backend IDs. Bind immutable candidate commit SHA and tree SHA, published 3.4.2 SHA, and frozen input/check digests here so later results cannot change tracked files. Do not omit candidate.tree.",
+  "candidate": null,
+  "published_3_4_2": null,
+  "host": null,
+  "astra": null,
+  "provider_configuration": null,
+  "approaches": {
+    "native-codex": {
+      "external_jobs": false
+    },
+    "published-3.4.2": {
+      "external_jobs": true
+    },
+    "candidate-3.4.3": {
+      "external_jobs": true
+    },
+    "direct-delegation": {
+      "external_jobs": true
+    }
+  },
+  "input_digests": {},
+  "check_digests": {}
+}
diff --git a/benchmarks/qualification/protocol.json b/benchmarks/qualification/protocol.json
new file mode 100644
index 0000000..c8be50f
--- /dev/null
+++ b/benchmarks/qualification/protocol.json
@@ -0,0 +1,107 @@
+{
+  "schema": "codex-co-engineer.qualification-protocol.v1",
+  "version": 1,
+  "title": "Codex-Co-Engineer 3.4.3 retrospective qualification protocol",
+  "status": "unrun",
+  "arms": {
+    "required": [
+      "native-codex",
+      "published-3.4.2",
+      "candidate-3.4.3",
+      "direct-delegation"
+    ],
+    "optional": []
+  },
+  "approaches": [
+    "native-codex",
+    "published-3.4.2",
+    "candidate-3.4.3",
+    "direct-delegation"
+  ],
+  "cases": [
+    {
+      "id": "acp-deadline-concurrent-cancel",
+      "status": "unrun",
+      "retrospective": true,
+      "source_sha": "dede188029aff117c60e9a8c4299cc0ab0838be9",
+      "implement": "cursor-local",
+      "review": "grok"
+    },
+    {
+      "id": "run-result-outcome-acceptance",
+      "status": "unrun",
+      "retrospective": true,
+      "source_sha": "3131f9ac7f6807eccb2ab68f027f1d98d3db3661",
+      "implement": "grok",
+      "review": "cursor-local"
+    },
+    {
+      "id": "comparison-failed-helper-cumulative",
+      "status": "unrun",
+      "retrospective": true,
+      "source_sha": "3131f9ac7f6807eccb2ab68f027f1d98d3db3661",
+      "implement": "grok",
+      "review": "cursor-local"
+    }
+  ],
+  "repetitions": 2,
+  "trial_count": 24,
+  "planned_identities": 24,
+  "ordering": {
+    "seed": 43,
+    "algorithm": "mulberry32-fisher-yates-grouped-by-case-rep-then-approach-positions",
+    "first_matched_group": "same-case-and-rep-all-four-arms"
+  },
+  "deadline": {
+    "entire_trial_ms": 3600000,
+    "max_corrections": 3
+  },
+  "paid_ceiling_usd": 25,
+  "live_jobs": "not_implemented",
+  "execution_identity": {
+    "bound_in": "external_execution_manifest",
+    "host_placeholders_forbidden": true,
+    "candidate_sha_not_tracked_here": true
+  },
+  "freeze_thresholds": {
+    "candidate_accepted": "6/6",
+    "task_median_native_output_per_accepted_vs_native_max": 0.5,
+    "task_median_native_output_per_accepted_vs_published_342_max": 0.75,
+    "astra_own_output_decreases_vs_published_342": true,
+    "median_turnaround_vs_native_max": 2,
+    "native_overhead_vs_direct_max": 1.25,
+    "failed_attempts_in_numerator": true,
+    "missing_primary_evidence": "inconclusive",
+    "paid_ceiling_usd": 25,
+    "max_corrections": 3,
+    "entire_trial_deadline_ms": 3600000,
+    "turnaround_reduction": "median of per-trial candidate/native wall ratios paired by case_id and rep; not the ratio of summed wall durations",
+    "native_overhead_reduction": "median of 3 task ratios of candidate native_output_per_accepted / direct native_output_per_accepted",
+    "astra_own_output_reduction": "count gpt-6-astra native output once from host-usage-report.v1 by_model; helpers excluded unless observed as Astra"
+  },
+  "accounting": {
+    "failed_attempts_in_numerator": true,
+    "missing_primary_evidence": "inconclusive",
+    "reuse_offline_comparator_parsing": true,
+    "task_median_not_pooled": true,
+    "helpers_in_total_not_astra_unless_astra": true,
+    "all_four_approaches_required": true,
+    "routes_bound_per_case": true,
+    "turnaround_reduction": "median of per-trial candidate/native wall ratios paired by case_id and rep; not the ratio of summed wall durations",
+    "native_overhead_reduction": "median of 3 task ratios of candidate native_output_per_accepted / direct native_output_per_accepted",
+    "astra_own_output_reduction": "count gpt-6-astra native output once from host-usage-report.v1 by_model; helpers excluded unless observed as Astra"
+  },
+  "safeguards": {
+    "public_mcp_tools": [
+      "status",
+      "delegate",
+      "task",
+      "tasks",
+      "cancel"
+    ],
+    "do_not_run_release_gate": true,
+    "do_not_publish": true,
+    "do_not_mutate_baseline_or_candidate_outside_worktree": true,
+    "no_live_jobs_in_helper": true
+  }
+}
diff --git a/docs/co-engineer-quickstart.md b/docs/co-engineer-quickstart.md
index c8a5c8b..84a6dc3 100644
--- a/docs/co-engineer-quickstart.md
+++ b/docs/co-engineer-quickstart.md
@@ -2,15 +2,48 @@
 
 Give Codex a team of external co-engineers without giving up control.
 
-This is the 60-second path after
+Start with **compatibility**, then **one chosen provider**, then one useful
+first outcome. Speak in ordinary language. You do not write tool payloads.
+
+## 1. Confirm the host
+
+Local Grok, Cursor Local, and Muse workers need:
+
+- Linux with a working `systemd --user` manager
+- `systemd-run` 244 or newer and unified cgroup v2
+- Node.js 24+
+- Python 3.11+ for bundled setup
+- A current Codex CLI with plugin support
+
+Cursor Cloud runs remotely and does not need that local process boundary.
+
+Follow
 [install and authentication](../README.md#install-and-authentication).
-Speak in ordinary language. You do not write tool payloads.
+Bundled setup may install **shared** package prerequisites. Authenticate only
+the **one** provider you plan to use first. Do not assume setup installs
+providers selectively.
 
 Start a **new** Codex session after the plugin add. Any extra Co-Engineer
-panel is optional, feature-detected, and host-specific. If this host has
-no panel, keep talking in Codex CLI. That headless path is complete.
+panel is optional, feature-detected, and host-specific. If this host has no
+panel, use the interactive Codex CLI with normal repository-sharing consent.
+Non-interactive evaluation did not complete that consent path; it is not
+validated as an unattended onboarding route.
+
+## 2. One useful first outcome
+
+From the **v3.4.3** source clone, copy `examples/first-outcome` into a clean
+Git repository (see that folder's README). Then ask Codex with your chosen
+provider—Grok is the default first route:
 
-## Delegate one assignment
+> Use Grok Co-Engineer to implement `lib/summarize-checks.cjs` so
+> `node summarize-checks.mjs` summarizes named check JSON (passed / failed /
+> skipped counts and failure names) and make the frozen `node check.mjs`
+> pass without editing the checker. Commit the result.
+
+Replace Grok with Cursor or Muse when that is your provider. Acceptance is
+local and deterministic: `node check.mjs`. No MCP payloads.
+
+## 3. Delegate one assignment
 
 You:
 
@@ -31,20 +64,21 @@ Codex waits once. When the work is complete, Codex inspects it:
 You still decide whether to keep, change, or discard the result. That
 sentence is Codex's review, not a merge, push, or pull request.
 
-## Delegate several independent assignments
+## 4. Independent assignments and review order
 
-Independent means the assignments do not share a writer path. The bound
-is eight. This is still one bounded run and one coordinated wait.
+Independent means the assignments do not share a writer path. The bound is
+eight. This is still one bounded run and one coordinated wait.
 
 You:
 
-> Split this into three isolated independent assignments: API
-> validation, the operator guide, and a review of both diffs.
+> Use Grok for API validation and Muse for the operator guide in two
+> isolated assignments. Once both finish, have Cursor review the integrated
+> candidate.
 
 Codex:
 
-> I am delegating this to Co-Engineer. Co-Engineer is preparing 3
-> independent assignments.
+> I am delegating this to Co-Engineer. Co-Engineer is preparing 2
+> independent assignments. I will arrange review after integration.
 
 The first card says `preparing` until every required lane has authoritative
 prompt-dispatch evidence; only then does it say `running`.
@@ -57,12 +91,23 @@ Name co-engineers when you care which route takes which assignment:
 Codex:
 
 > I am delegating this to Co-Engineer. Using Grok Co-Engineer.
-> Using Muse Co-Engineer. Using Cursor Co-Engineer. Co-Engineer is
-> preparing 3 assignments.
+> Using Muse Co-Engineer. Co-Engineer is preparing 2 assignments.
+> Cursor will review the resulting candidate in a subsequent assignment.
+
+For multi-provider recipes, **review the resulting immutable candidate**. Do
+not run a dependent review concurrently against the shared base while writers
+are still producing it.
 
-## Ask once when nothing is named
+Version 3.4.3 adds provider preferences and `task.revision`.
+Published 3.4.2 uses explicit fresh assignments for completed-candidate fixes.
 
-If you want a team and have no saved profile and no named co-engineers:
+Provider preferences on a run request reuse ownership **for that request** by
+role. Exact assignment provider or model choices win. Preferences are not
+saved global Codex settings.
+
+## 5. Ask once when nothing is named
+
+If no provider choice is available from the request or earlier conversation:
 
 You:
 
@@ -82,10 +127,11 @@ Codex:
 > I am delegating this to Co-Engineer. Using Grok Co-Engineer.
 > Using Muse Co-Engineer. Co-Engineer is preparing 2 assignments.
 
-## Chat with existing work
+## 6. Chat, correct, or cancel
 
-`Chatting with Co-Engineer` never starts a run. It inspects, continues,
-answers grouped attention, or cancels work that already exists.
+`Chatting with Co-Engineer` manages an existing assignment: inspect,
+continue, answer grouped attention, or cancel. Unrelated new work needs an
+explicit new delegation, not chat.
 
 If Codex groups questions from more than one assignment:
 
@@ -93,6 +139,10 @@ If Codex groups questions from more than one assignment:
 
 Answer once. That is not a second delegation.
 
+To correct a **completed** candidate, ask Codex to return bounded findings to
+the same external owner. That uses a fresh scoped `task.revision`, not a
+terminal `run_reply`. `run_reply` is for pending questions or consent only.
+
 If a required assignment fails or stays unresolved, Codex does not say
 Co-Engineer finished, and I verified the candidate. You may cancel:
 
@@ -103,8 +153,9 @@ Co-Engineer finished, and I verified the candidate. You may cancel:
 The honest shape is up to eight isolated external co-engineers, one
 bounded run, one coordinated wait, one verified decision.
 
-Codex remains chief engineer and reviewer. External workers may commit within
-their assigned scope. Publication and merge require user authorization and Codex review.
+The public MCP catalog remains five tools: `status`, `delegate`, `task`,
+`tasks`, and `cancel`. Codex remains chief engineer and reviewer.
+External workers may commit within their assigned scope. Publication and merge require user authorization and Codex review.
 Review exact commit and tree identities, verification results, and current CI
 before integration. The user retains version, tag, release, and protected-ref authority.
 
diff --git a/docs/co-engineer-troubleshooting.md b/docs/co-engineer-troubleshooting.md
index f5e221d..18544e3 100644
--- a/docs/co-engineer-troubleshooting.md
+++ b/docs/co-engineer-troubleshooting.md
@@ -51,6 +51,15 @@ codex plugin marketplace add LOCAL_ROOT
 codex plugin add codex-co-engineer@codex-co-engineer
 ```
 
+When older open projects still use the public marketplace identity
+`codex-co-engineer`, create that local marketplace wrapper outside the tracked
+candidate with the unchanged plugin name and exact tested plugin bytes.
+Remove/re-add alone is not sufficient because opening an older project can
+replace the same-name cache again. Verify project-scoped `plugin/list`
+inventory and persistence after a connection restart. A separate clean Codex
+environment remains valid for clean onboarding. Keep the shipped
+`.agents/plugins/marketplace.json` unchanged.
+
 Treat client-to-host resync as suspected until versions or file hashes confirm
 it. Do not add an auto-repair cron, replace the cache with a symlink, or disable
 unrelated configuration to mask the problem.
@@ -95,7 +104,9 @@ natural language and do not replay the prompt automatically.
 No. Use normal provider login or the owner-only key files. Credentials
 must not appear in MCP arguments, prompts, receipts, fixtures, or Git.
 
-- Grok: `grok login`
+- Grok: `grok login`, or `grok login --device-auth` when a browser is
+  unavailable. Subscription login only; no API key is required for a Grok
+  first outcome.
 - Cursor Local: `cursor-agent login`
 - Muse and optional Ox Alpha: `OPENROUTER_API_KEY`,
   `CODEX_CO_ENGINEER_OPENROUTER_API_KEY_FILE`, or
diff --git a/docs/configuration.md b/docs/configuration.md
index 3c1be3b..cfb821f 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -266,12 +266,13 @@ Muse. Codex does not invent a default router.
 
 ## Authentication
 
-Authenticate Grok and Cursor Local with their normal CLIs. DSH Muse and DSH
-Ox Alpha use the owner-only OpenRouter key, and Cursor Cloud uses its normal
-API key. Credentials
-must not be placed in MCP arguments, prompts, receipts, fixtures, or
-Git. Provider login state persists in the provider's normal user
-configuration between Codex tasks.
+Authenticate Grok and Cursor Local with their normal CLIs. For Grok, run
+`grok login`, or `grok login --device-auth` when a browser is unavailable.
+Grok first-outcome work uses subscription login; no API key is required.
+DSH Muse and DSH Ox Alpha use the owner-only OpenRouter key, and Cursor Cloud
+uses its normal API key. Credentials must not be placed in MCP arguments,
+prompts, receipts, fixtures, or Git. Provider login state persists in the
+provider's normal user configuration between Codex tasks.
 
 ## State and retention
 
diff --git a/docs/contributor-tasks.md b/docs/contributor-tasks.md
new file mode 100644
index 0000000..33884e8
--- /dev/null
+++ b/docs/contributor-tasks.md
@@ -0,0 +1,131 @@
+# Contributor starter tasks
+
+These are approachable, self-contained tasks. They are **not** pre-created
+GitHub issues; open a new issue or pull request when you take one. Prefer a
+focused fixture check over a full suite while iterating. Complex provider
+integrations and cancellation-boundary redesigns need maintainer guidance and
+are omitted here.
+
+## 1. Clarify one local setup error path
+
+**Problem:** A first-time user on a supported Linux host hits a missing
+`systemd --user` or cgroup v2 prerequisite and cannot tell which check to run
+next.
+
+**Scope:** Improve one troubleshooting or configuration paragraph (and its
+matching fixture or packaged-doc assertion if one already covers the phrase).
+Do not change installer behavior or provider drivers.
+
+**Acceptance:** The docs name the prerequisite and the next local command
+(`status` or `setup:check` as appropriate). No personal paths or credentials.
+
+**Check:**
+
+```bash
+node --no-warnings --test plugins/codex-co-engineer/test/branding.test.mjs
+node scripts/validate-package-docs.mjs
+```
+
+## 2. Extend the first-outcome example
+
+**Problem:** `examples/first-outcome` ships a useful but tiny summarize-checks
+stub; contributors can deepen the utility or add one more frozen acceptance
+case without live providers.
+
+**Scope:** Edit only files under `examples/first-outcome/**`. Keep the starter
+prompt in ordinary language. Do not weaken `check.mjs` to force a pass. Do not
+add paid-provider or npm-package prerequisites.
+
+**Acceptance:** Keep the shipped implementation incomplete so it remains an
+assignment. Demonstrate the added case with a temporary completed implementation
+and retain the intentionally failing baseline. Do not commit the answer to the
+starter exercise. The example still copies into a fresh Git repository.
+
+**Check:**
+
+```bash
+node examples/first-outcome/check.mjs
+```
+
+## 3. Document one supported-host setup failure
+
+**Problem:** Maintainers need redacted reports of real setup failures on
+supported hosts (Node 24+, Python 3.11+, Linux systemd/cgroup v2).
+
+**Scope:** Add a short compatibility note under `docs/` (or extend
+troubleshooting) with the failure category, host class, and the command that
+surfaced it. Synthetic excerpts only.
+
+**Acceptance:** Another reader can recognize the same failure class and know
+which check to re-run. No private paths, logs from a personal home directory,
+or credentials.
+
+**Check:**
+
+```bash
+git diff --check
+node scripts/validate-package-docs.mjs
+```
+
+## 4. Improve issue or PR template clarity
+
+**Problem:** New reporters still leave out attempt/outcome, or PR descriptions
+omit checks and limits.
+
+**Scope:** Edit only `.github/ISSUE_TEMPLATE/**` or
+`.github/pull_request_template.md`. Keep required fields minimal; keep the
+private security route; do not claim Discussions is enabled.
+
+**Acceptance:** Required bug fields and security advisory routing remain
+present; PR template still has Problem / Result / Checks / Limits headings;
+questions remain issue-based. These grep checks confirm key phrases—they are
+not a YAML schema validator.
+
+**Check:**
+
+```bash
+grep -n 'required: true' .github/ISSUE_TEMPLATE/bug.yml
+grep -n 'security/advisories/new' .github/ISSUE_TEMPLATE/config.yml
+grep -n '^## Problem\|^## Result\|^## Checks\|^## Limits' .github/pull_request_template.md
+test ! -e .github/DISCUSSION_TEMPLATE
+```
+
+## 5. Add a fixture-only regression for a documented contract
+
+**Problem:** A documented public contract (for example five-tool catalog text
+or publication authority wording) can drift without a focused test.
+
+**Scope:** Add or tighten one provider-free unit/fixture test under
+`plugins/codex-co-engineer/test/`. No live provider calls, no schema version
+bumps, no sixth tool.
+
+**Acceptance:** The new or updated test fails when the contract text or
+behavior regresses, and passes on the current tree.
+
+**Check:**
+
+```bash
+# Run only the test file you added or changed, for example:
+node --no-warnings --test plugins/codex-co-engineer/test/<your-contract-test>.mjs
+```
+
+## 6. Add one small frozen comparison case
+
+**Problem:** Reproducible comparisons need useful shared tasks and decisive
+acceptance checks before any paid cohort runs.
+
+**Scope:** Add one case under `benchmarks/cases/` and update its fixture coverage
+in `scripts/compare-coengineer-runs.test.mjs`. Follow `benchmarks/README.md` to
+materialize the initial commit and retain its input digest. Keep the task small.
+
+**Acceptance:** The initial input has the intended failure or review finding;
+an independently checked solution satisfies the frozen acceptance. Repeated
+materialization produces the same base commit. Unrun arms remain unrun; synthetic
+measurements stay labeled. No paid providers are needed for this contribution.
+
+**Check:**
+
+```bash
+node scripts/compare-coengineer-runs.mjs --validate-cases benchmarks/cases
+node --no-warnings --test scripts/compare-coengineer-runs.test.mjs
+```
diff --git a/docs/demos/ownership-deadline.md b/docs/demos/ownership-deadline.md
new file mode 100644
index 0000000..9e39fa3
--- /dev/null
+++ b/docs/demos/ownership-deadline.md
@@ -0,0 +1,81 @@
+# A real correction during Co-Engineer development
+
+On September 10, 2026, Co-Engineer used external coding agents to build its next
+ownership and deadline changes. This case records one completed engineering
+loop from that work. It is a development record, not a staged terminal session
+or a comparative benchmark.
+
+## Implementation → independent review → correction → Codex acceptance
+
+1. **Cursor implemented extensible ACP deadlines.** The active provider turn
+   had an inner fixed timeout that could outlive the intent of the supervisor's
+   recorded extension. The change made the supervisor's current deadline and
+   cancellation signal govern the turn and retained timeout truth after
+   partial output. Producer commit: `4e8460ee097f686c1ae804c3b5b651ecd8f321ec`;
+   integrated as `d2c691f`.
+2. **Codex reviewed the implementation independently.** A module-global
+   active signal let concurrent ACP sessions replace each other's cancellation
+   context. Late promise settlement also needed to remain observed. A passing
+   single-session test would not establish correct concurrent behavior.
+3. **The same external owner corrected the findings.** Cursor replaced the
+   global signal with per-turn `AsyncLocalStorage`, handled late settlement,
+   and added concurrent-session and pre-aborted-turn coverage. Producer commit:
+   `43d9e79f229c93681cee7ee902f5ef233da51066`; integrated as `eed128c`.
+4. **Codex accepted the correction into the development candidate.** Independent
+   focused runtime checks passed 53/53; provenance and offline reproducibility
+   checks passed 9/9. The checked vendor bundle reproduced byte for byte.
+   This acceptance covers the deadline correction. It is not permission to
+   publish, merge, or describe all of 3.4.3 as qualified.
+
+The installed coordinator used for these jobs was 3.4.2. Correction was a fresh
+explicit assignment tied to the completed producer. This record therefore
+demonstrates the ownership practice and the resulting code; it does not alone
+prove the new `task.revision` operation on an installed 3.4.3 host. Production
+supervisor-path fixtures exercise that operation against actual Git worktrees.
+The release procedure still requires native host acceptance.
+
+## Retained observations
+
+| Observation | Implementation | Correction |
+| --- | --- | --- |
+| Provider/model recorded by the task | Cursor Local / composer-1 | Cursor Local / composer-1 |
+| Task created (UTC) | 21:00:53.867 | 21:18:13.966 |
+| Task finished (UTC) | 21:13:40.920 | 21:22:00.620 |
+| Created-to-finished duration | 767,053 ms | 226,654 ms |
+| Reconciled terminal state | completed | completed |
+| Process boundary / writer lock | inactive_empty / unlocked | inactive_empty / unlocked |
+| Provider tokens and cost | unknown | unknown |
+| Total native usage, including helpers | unknown | unknown |
+
+Times come from durable task timestamps. They include startup and cleanup and
+are not active model-compute times. These two jobs total 993,707 ms; their
+overlapping parent task also included Grok work and other review activity.
+Do not use this sum as total project elapsed time or a native-only counterfactual.
+
+The original aggregate briefly reported a transport observation problem;
+subsequent task inspection proved normal completion and cleanup. The provider
+job was not replayed. A local sandbox initially prevented test subprocesses
+from completing their ACP handshake; running the same checks with the required
+host process support passed. Both recovery work and correction work belong in
+any future cost comparison.
+
+## Reproduce the code checks
+
+From the candidate checkout, with Node.js 24 and its documented dependencies:
+
+```sh
+node --no-warnings --test \
+  plugins/codex-co-engineer/test/acpx-runtime.test.mjs \
+  plugins/codex-co-engineer/test/v3-acp-worker.test.mjs
+npm --prefix tools/acpx-vendor run test:reproducible
+```
+
+These deterministic checks require local child-process support and no paid
+provider. Their counts can grow with later regression coverage. The complete
+[release gate](../release.md) is still authoritative for release qualification.
+For a first external assignment use the [quickstart](../co-engineer-quickstart.md).
+For quantitative comparisons use the [benchmark protocol](../../benchmarks/).
+
+Raw task receipts remain private: they contain worktree locations and provider
+output. This page intentionally records only the facts needed to examine the
+engineering claim. Missing usage has not been filled with token estimates.
diff --git a/docs/efficient-dogfood.md b/docs/efficient-dogfood.md
index 2608f07..5272ad0 100644
--- a/docs/efficient-dogfood.md
+++ b/docs/efficient-dogfood.md
@@ -1,6 +1,15 @@
 # Efficient Codex-Co-Engineer dogfood workflow
 
-This workflow for Codex-Co-Engineer 3.2.0 minimizes coordination calls and
+For current semantic runs, read
+`skills/delegate-to-co-engineer/references/autonomous-ownership.md` and
+`skills/delegate-to-co-engineer/references/launch.md` inside the installed plugin
+(`plugins/codex-co-engineer/` in a source clone), plus the [run API](run-tool-api.md). Delegate preparation, implementation, tests and
+corrections together, retain provider preferences, and use compact candidate
+evidence at the review boundary. Measure parent plus native-child usage per
+accepted result; moving work from Astra to a native helper does not measure
+external-capacity utilization. Missing provider usage stays unknown.
+
+The compatible 3.2.0 workflow below minimizes coordination calls and
 repeated receipt content without weakening Codex's review and merge
 authority. The core pattern is:
 
diff --git a/docs/release.md b/docs/release.md
index 00a7d97..c9226c3 100644
--- a/docs/release.md
+++ b/docs/release.md
@@ -5,7 +5,7 @@ The authoritative gate runs once against one exact clean local candidate:
 ```sh
 release-gate plan --repo "$PWD"
 release-gate run --repo "$PWD" \
-  --receipt /tmp/codex-co-engineer-v3.4.2-release-gate.json
+  --receipt /tmp/codex-co-engineer-v3.4.3-release-gate.json
 ```
 
 The package supports Node.js 24 and newer. The release gate is intentionally
@@ -66,11 +66,22 @@ After the provider-free gate passes:
 
 ## Local release installation identity
 
-Use a distinct local marketplace name for an unpublished release candidate when
-an open project still contains an older plugin under the public marketplace name.
-Keep the plugin name and tested plugin bytes unchanged. Remove the conflicting
-installed identity through the supported plugin CLI; preserve any dirty source
-checkout instead of changing its version label or replacing its files.
+The public release candidate keeps the stable marketplace identity
+`codex-co-engineer` in `.agents/plugins/marketplace.json`. Do not rename the
+shipped marketplace to solve a local install collision, invent unsupported
+install flags, or silently modify tracked manifests during installation.
+
+Prefer a clean Codex installation for candidate qualification and onboarding.
+A separate clean Codex environment remains valid for clean onboarding.
+
+When older open projects still use that public marketplace identity, create a
+distinct local marketplace wrapper outside the tracked candidate. Keep the
+plugin name and the exact tested plugin bytes unchanged; only the local wrapper
+marketplace identity differs. Finish or cancel active runs first. Remove/re-add
+alone is not sufficient: opening an older project with the same
+marketplace/plugin identity can replace the shared cache again. Preserve any
+dirty source checkout instead of changing its version label or replacing its
+files.
 
 Codex can refresh installed local plugins when listing project marketplaces.
 A project source with the same marketplace/plugin identity can replace the
@@ -79,10 +90,12 @@ An existing MCP process then retains paths into the removed version.
 
 After installation, verify the actual project-scoped `plugin/list` operation for
 open development checkouts: the candidate must remain installed and enabled,
-its complete file inventory must match the qualified source, and old identities
-must remain uninstalled. Repeat the inventory check after the host connection
-restarts, then run native provider acceptance. CLI marketplace listing alone
-and a successful check immediately after copying files do not prove persistence.
+its complete file inventory must match the qualified source, and stale
+installations must remain uninstalled. Repeat the inventory check after the host
+connection restarts, then run native provider acceptance. CLI marketplace
+listing alone and a successful check immediately after copying files do not prove
+persistence. Historical release notes alone do not preserve the current host
+gate.
 
 ## Native run acceptance
 
@@ -107,6 +120,65 @@ Record the tested commit and whether other provider routes were exercised.
 The lifecycle ownership decision is
 [ADR 0002](adr/0002-native-run-lifecycle.md).
 
+## Additional 3.4.3 candidate evidence
+
+Keep every existing requirement above. The new result and comparison fixtures
+are provider-free; they do not establish paid evaluation results or replace
+live acceptance. The local gate and CI both run the comparison fixture suite
+and the provider-free trial-usage and qualification unit stages. Historical
+qualification fixtures require full Git history so CI can read pinned commits.
+
+For ownership changes, retain evidence of a completed producer, independent
+review, specific feedback, a corrected candidate, and Codex's acceptance.
+Exercise the successful revision, exhausted correction limit, stale head,
+concurrent repeated request, missing lifecycle proof, and timeout after partial
+output. Inspect revision lineage again after restart. Prove deadline extensions
+against both the old and extended deadline with concurrent sessions.
+
+The [development case study](demos/ownership-deadline.md) records real work;
+it identifies the installed coordinator and the limit of each check. Before a
+release showcase, capture actual use on the qualified host and label elapsed
+time and any compression. Do not present a scripted walkthrough or fixture
+comparison as live provider evidence. Fresh-user installation observations
+should record the chosen provider, host class, tested version, first successful
+outcome or failing step, and time to that result; keep private diagnostics local.
+
+### Required 3.4.3 evaluation cohort
+
+Before treating the candidate as evaluation-complete, run the matched
+comparison under these rules. Missing evidence is inconclusive, not a pass.
+Do not claim human-validation of agent onboarding.
+
+1. **Budget.** Cap TOTAL API/Cloud spend at **$25** with an enforceable cap or a
+   bounded maximum cost checked before dispatch. Do not dispatch paid work beyond
+   the cap.
+2. **Design.** Four approaches — native Codex, published 3.4.2, candidate
+   3.4.3, and direct delegation — times **three** representative retrospective
+   tasks times **two** repetitions = **24** trials. Use the seed43 case set and
+   bind exact source identities.
+3. **Accounting.** Record complete parent, helpers, reasoning, and compaction
+   usage. Count every attempt, correction, and native helper. Cap owned
+   corrections at **three** rounds. Enforce a **1-hour** total trial deadline.
+4. **Gate thresholds (all required).**
+   - Candidate: **6/6** accepted.
+   - Median task-level native output per accepted result: **≤ 50%** of native
+     and **≤ 75%** of published 3.4.2.
+   - Astra's own output decreases relative to published 3.4.2; native helpers
+     do not satisfy this threshold.
+   - Median wall clock: **≤ 2×** native.
+   - Native overhead versus direct: **≤ 1.25×**.
+5. **Onboarding.** Collect clean-environment agent onboarding evidence for the
+   candidate install path. Do not claim that a human validated the agent
+   onboarding path.
+
+Follow the [benchmark protocol](../benchmarks/) for materialization and
+analysis. Link [PR43](https://github.com/ajhcs/Codex-Co-Engineer/pull/43) for
+the candidate path and for actual measurements when retained. Parent tip
+`c50550e` is historical development evidence; an external execution manifest
+binds the final integrated candidate SHA after integration. Synthetic fixtures
+and this checklist do not establish savings. Missing usage stays unknown in the
+[result report](run-results.md).
+
 ## Handoff and cleanup
 
 Codex reviews and merges. Managed local worktrees remain until their result is
@@ -133,9 +205,10 @@ opened. Never create an empty PR.
 
 ## Authorized GitHub publication
 
-The release body is [releases/v3.4.2.md](releases/v3.4.2.md). Preserve all historical
-release notes, including [3.4.0](releases/v3.4.0.md). Documentation changes alone
-are not publication authorization; an explicit maintainer release instruction is.
+The release body is [releases/v3.4.3.md](releases/v3.4.3.md). Preserve all historical
+release notes, including [3.4.2](releases/v3.4.2.md) and [3.4.0](releases/v3.4.0.md).
+Documentation changes alone are not publication authorization; an explicit
+maintainer release instruction is.
 
 1. Fetch public main and reconcile it into the candidate. Both the published
    baseline and the accepted local fixes must be ancestors of the release.
@@ -147,8 +220,8 @@ are not publication authorization; an explicit maintainer release instruction is
 5. Merge the reviewed branch, capture the exact resulting main SHA, and verify
    that its tree matches the qualified candidate. If content changed, qualify
    the new candidate before tagging.
-6. Create `v3.4.2` at that reviewed main SHA and publish the body from
-   `docs/releases/v3.4.2.md`. Verify the remote tag, release body, source download,
+6. Create `v3.4.3` at that reviewed main SHA and publish the body from
+   `docs/releases/v3.4.3.md`. Verify the remote tag, release body, source download,
    and tag-based installation instructions after publication.
 
 The public release includes source and documentation. Never attach owner-only
diff --git a/docs/releases/v3.4.3.md b/docs/releases/v3.4.3.md
new file mode 100644
index 0000000..d35c341
--- /dev/null
+++ b/docs/releases/v3.4.3.md
@@ -0,0 +1,157 @@
+# Codex-Co-Engineer 3.4.3
+
+Released 2026-09-11 with **partial qualification**, at the maintainer's
+direction. External ownership, independent review, corrections, and Codex
+acceptance were demonstrated on real implementation work. Automated release
+checks and GitHub CI passed; publication does not establish measured savings.
+
+The comparison has **zero valid matched results**. Its first attempt was
+retained as invalid because inherited host instructions exposed later
+implementation context; normal non-interactive consent also did not complete.
+Clean-environment agent onboarding, refreshed native-host provider acceptance,
+and Desktop wait/recovery checks remain incomplete. These requirements remain
+in the release process and are follow-up qualification work, not passed gates.
+See the [public evidence on PR43](https://github.com/ajhcs/Codex-Co-Engineer/pull/43#issuecomment-5637539472)
+for failures, limitations, and the separately reported setup accounting.
+
+[Installation](../../README.md#install-and-authentication) ·
+[Configuration](../configuration.md) · [Troubleshooting](../co-engineer-troubleshooting.md) ·
+[Release process](https://github.com/ajhcs/Codex-Co-Engineer/blob/main/docs/release.md)
+
+## Highlights
+
+| Before | With 3.4.3 |
+| --- | --- |
+| Corrections and checks often return to the lead agent | Bounded external ownership keeps implementation, checks, and up to three correction rounds with the producer |
+| Completion can be mistaken for acceptance or savings | Ordinary results expose compact evidence; unknown usage stays unknown; no invented savings claim |
+| Extended deadlines did not always govern the active turn | Supported deadline extensions govern the active ACP turn and keep timeout/cancellation truthful |
+| New contributors lacked a first outcome and evaluation path | Onboarding example, support routes, contributor tasks, frozen cases, and an offline analyzer |
+
+## Ownership and corrections
+
+Delegate complete engineering assignments—preparation, implementation,
+meaningful checks, and requested corrections—to the external owner. Codex and
+other lead agents retain independent review and final acceptance.
+
+- Role preferences and an explicit provider choice preserve ownership for that
+  request; they do not infer balances or silently replace an active worker.
+- `task.revision` returns bounded findings to the same owner and scope within
+  the existing five-tool catalog (`status`, `delegate`, `task`, `tasks`,
+  `cancel`).
+- Correction chains cap at three rounds. Duplicate or conflicting feedback is
+  explicit; identical repeated requests stay safe without prompt replay.
+- One admitted child per producer is reserved across server processes, with
+  lineage retained through restart.
+
+## Truthful evidence
+
+Ordinary run replies include compact `result_evidence` tied to the existing
+usage ledger and decision-card helpers.
+
+- Show measured submissions, available elapsed time, candidate identity, and
+  review state when known.
+- Unknown usage stays unknown. Completion is never Codex acceptance.
+- Do not convert native tokens into subscription dollars or invent percentage
+  savings from fixtures.
+- [PR43](https://github.com/ajhcs/Codex-Co-Engineer/pull/43) retains the real
+  development evidence and unsuccessful evaluation attempt. Actual matched
+  measurements remain pending under the published budget rules; development
+  cases and synthetic fixtures do not establish workload reduction.
+
+## Deadline fix
+
+Supported deadline extensions govern the active ACP turn, including concurrent
+sessions and late provider output. Timeout and cancellation remain truthful
+after partial provider output. Direct terminal uncertainty to inspection and
+keep active work on bounded waits.
+
+ACP results now settle after persistent-client finalization, so an immediate
+runtime close can clean up the retained agent and its descendants. Cursor
+corrected a real CI cleanup failure through two owned revisions; Grok checked
+the final commit independently, including stress checks and a regression that
+fails against the prior runtime. Astra accepted the correction.
+
+## Onboarding and contributor package
+
+- One-provider first-outcome example under `examples/first-outcome` in the
+  v3.4.3 source. Clean-agent completion remains unverified.
+- Issue forms, PR template, `SUPPORT.md`, contributor tasks, and a roadmap that
+  separates this adoption package from later work.
+- Frozen comparison cases and an offline analyzer that count native helpers,
+  corrections, and failed attempts. Synthetic fixtures do not establish savings.
+- OpenAI showcase preparation notes the current local-MCP submission limitation
+  without submitting a listing.
+
+## Upgrading
+
+### Install the published tag
+
+Finish or cancel active runs before upgrading. Preserve a dirty development
+clone and install from a separate clean clone:
+
+```bash
+git clone --branch v3.4.3 --single-branch https://github.com/ajhcs/Codex-Co-Engineer.git Codex-Co-Engineer-3.4.3
+cd Codex-Co-Engineer-3.4.3
+npm --prefix plugins/codex-co-engineer run setup
+codex plugin marketplace add "$PWD"
+codex plugin add codex-co-engineer@codex-co-engineer
+npm --prefix plugins/codex-co-engineer run setup:check
+```
+
+Keep this clone as the registered marketplace source. For an existing public
+installation, remove `codex-co-engineer@codex-co-engineer` with `codex plugin
+remove` before adding it again from this new source. Start a new Codex session
+and ask for Co-Engineer status. Historical compatibility and the previous
+release remain documented in the [3.4.2 notes](v3.4.2.md).
+
+The public release keeps the marketplace identity `codex-co-engineer` in the
+shipped manifest. Prefer a clean Codex environment for onboarding. If older
+open projects share that identity, create a distinct local marketplace wrapper
+outside the tracked release, with the unchanged plugin name and exact released
+plugin bytes. Remove/re-add alone is not sufficient: opening an older project
+can replace the same-name cache again. Do not rename the shipped manifest to
+solve a local collision.
+
+### From an already-installed local 3.4.3 candidate
+
+Finish or cancel active runs. If older open projects still share the public
+marketplace identity, refresh through a distinct local marketplace wrapper
+outside the tracked candidate (unchanged plugin name and exact tested bytes),
+then restart the Codex session. Remove/re-add alone may not survive opening an
+older same-identity project. Do not assume the version string proves that the
+currently running MCP process contains the new build. Existing durable state
+retains its prior directory identity for compatibility. Do not delete task
+state or provider login files as an upgrade step.
+
+### Muse OpenRouter migration
+
+Users still on a direct Meta Muse profile must migrate to OpenRouter as
+documented for [3.4.2](v3.4.2.md#migrating-a-direct-meta-muse-profile). That
+migration is unchanged in 3.4.3.
+
+## Compatibility
+
+The public MCP catalog remains exactly five tools. No new MCP tools, quota
+router, or automatic balance routing ship in 3.4.3. Published 3.4.2
+behavior remains the baseline for arms that intentionally install that release.
+Cursor compatibility package versioning is independent and is not bumped here.
+
+## Requirements and known limits
+
+- Node.js 24+, Git, Python 3.11+ for bundled setup, and Codex plugin support are
+  required. The release gate runs on Node.js 24 for reproducibility.
+- Local providers require Linux, a working `systemd --user` manager,
+  `systemd-run` 244+, unified cgroup v2, and Python 3.11+ for the bundled
+  worktree tool. Lifecycle control is not a sandbox.
+- Publication is not a substitute for host acceptance, clean-environment
+  agent onboarding evidence, or the budgeted comparison cohort.
+- Missing evaluation evidence is inconclusive; it is not a pass.
+
+## Validation
+
+Keep every existing exact-candidate gate, CI, host, and native-run acceptance
+requirement in [the release process](https://github.com/ajhcs/Codex-Co-Engineer/blob/main/docs/release.md). Additional 3.4.3 evaluation
+rules there cover the $25 TOTAL API/Cloud cap, seed43 cohort shape, accounting,
+acceptance thresholds (including Astra own-output versus published 3.4.2; helpers
+do not satisfy), and clean-environment onboarding. Do not treat provider-free
+fixture suites or this document as live provider proof.
diff --git a/docs/roadmap.md b/docs/roadmap.md
new file mode 100644
index 0000000..e33e7ba
--- /dev/null
+++ b/docs/roadmap.md
@@ -0,0 +1,50 @@
+# Roadmap
+
+Status: 3.4.3 is published with partial qualification. Measured benefit,
+clean-agent onboarding, and refreshed native-host acceptance remain open.
+See the [release notes](releases/v3.4.3.md) and [release requirements](release.md).
+
+This roadmap distinguishes the **3.4.3 adoption and ownership package** from
+later ideas. It is not a usage forecast, adoption claim, or endorsement.
+
+## In scope for 3.4.3
+
+| Theme | Intent |
+| --- | --- |
+| Ownership and deadlines | Finish complete external ownership through bounded correction, with truthful deadline and revision behavior. |
+| Demonstrable outcomes | Make a reviewed candidate understandable: assignment outcome, changes, decisive checks, review state, and unresolved decisions. |
+| Onboarding | A short first-success path: host compatibility, one chosen provider, and a tiny public example under `examples/first-outcome`. |
+| Contribution and evaluation package | Issue forms, PR template, `SUPPORT.md`, welcoming contributor guide, starter tasks, frozen comparison cases and an offline analyzer that includes native helpers, corrections, and failed attempts. |
+
+## Remaining qualification and showcase evidence
+
+The [development case](demos/ownership-deadline.md) records actual implementation,
+review, correction, and Codex acceptance of a specific fix. Complete the existing
+gate and host acceptance before labeling a recording as a qualified-release demo.
+Run fresh-user installation attempts and matched paid comparison cohorts with an
+explicit evaluation budget; publish failures and missing measurements too.
+See [showcase preparation](showcase.md) for the current local-MCP distribution route.
+
+## Later (not this package)
+
+These remain open design or later release work. They are **not** beginner
+contributor tasks for 3.4.3:
+
+- Broad graph or visual workflow editing UI
+- Wide OS expansion beyond the current Linux/systemd/cgroup v2 local boundary
+- Large multi-provider catalog expansion
+- Automatic budget or subscription-balance routing
+- Product analytics or predicted usage percentages
+
+Compatibility experiments with other tools can be evaluated independently.
+They should not be tightly coupled into this patch's qualification scope.
+
+## Contribution guidance
+
+Approachable starter work is listed in [contributor-tasks.md](contributor-tasks.md).
+Complex provider integrations and cancellation-boundary redesigns need
+maintainer guidance and should not be labeled beginner tasks.
+
+Questions and reports use Issues today; see [SUPPORT.md](../SUPPORT.md).
+Preserve the five-tool catalog (`status`, `delegate`, `task`, `tasks`,
+`cancel`) and Codex as final review authority in any contribution.
diff --git a/docs/run-results.md b/docs/run-results.md
new file mode 100644
index 0000000..0ec1da2
--- /dev/null
+++ b/docs/run-results.md
@@ -0,0 +1,75 @@
+# Understand a Co-Engineer result
+
+In 3.4.3, ordinary run replies include a compact `result_evidence`
+view. Ask Codex what finished, what needs review, and which decision comes next.
+Ask for the run's diagnostics when you need the detailed outcome and usage
+report. This uses the existing `task` tool with `view: "diagnostics"`.
+
+## What finished?
+
+The result distinguishes work in progress, completed work needing review,
+failed work, and unresolved evidence. A completed provider job does not mean
+Codex accepted its changes. A provider's PASS message does not prove a check
+passed. Codex reviews the exact candidate and makes the acceptance decision
+in the conversation; the tool does not accept or merge code automatically.
+
+The coordination packet keeps each producer's exact head and request identity.
+Independent branches are not described as one composed candidate. Existing
+handoffs and bounded provider results remain available beside the result
+card. Missing checks or composition evidence stay unknown.
+
+For corrections, follow the returned revision run ID. The original producer,
+reviewed head, correction round, and existing child are retained. The fixed
+limit is three successive correction rounds, with one distinct admitted child
+per producer. An exhausted loop requires a deliberate new bounded assignment;
+it never automatically starts one.
+
+## What did this run use?
+
+The report uses the existing usage ledger. The ordinary admission path derives
+a bounded snapshot from its retained facts:
+
+| Fact | Meaning |
+| --- | --- |
+| Submissions | One semantic run submission, counted once across its assignments |
+| Provider invocations | Positively acknowledged dispatches; attempted but unacknowledged work remains unknown |
+| Attention rounds | The admission runtime's recorded attention count |
+| Elapsed time | Recorded time to the terminal handoff, including coordination delay; unknown while unavailable |
+| Provider tokens and cost | Unknown on this path unless a separately bound ledger supplies them |
+| Native tokens, helpers, and subscription balance | Unknown; the plugin does not read private host accounting |
+| Tool calls and response/evidence bytes | Unknown where the runtime has not instrumented the complete quantity |
+
+Run-wide counters contribute once to ledger totals. They are not measurements
+of an individual provider's latency. Re-reading or restarting does not turn
+cumulative observations into extra work. This report covers the current run;
+it does not silently combine previous producers, revisions, or native helpers.
+Compare the complete sequence when evaluating an outcome.
+
+The ledger distinguishes host measurements, provider reports, evidence bytes,
+and unknown values. Bytes are not tokens. Provider reports do not become host
+measurements. Unlike provider/model token counts must remain distinguishable.
+One run cannot establish savings against a workflow that was never measured.
+
+## Sharing and reproducing evidence
+
+The bounded result projection omits raw prompts, transcripts, and worktree
+paths. Review identifiers and any selected evidence before posting a report;
+a useful task name may still reveal private context. Nothing is published
+automatically. Use the repository's support route to share the relevant
+summary and your description of the problem.
+
+The [run API](run-tool-api.md) describes the machine fields. In a source clone,
+`benchmarks/README.md` describes case preparation and offline comparisons,
+including native helpers, corrections, failed attempts, and missing metrics.
+Paid comparisons need an explicit evaluation budget. Supplied fixture data
+demonstrates the analyzer and is not a measured performance result.
+
+The underlying helpers are `projectRunResultEvidenceV1`, `projectUsageReportV1`,
+and `projectLocalOutcomeCardV1`. The existing PR/CI decision card retains its
+separate exact-candidate requirements. The public catalog remains `status`,
+`delegate`, `task`, `tasks`, and `cancel`.
+
+Different feedback against a producer with an admitted child is rejected with
+that child's id and a statement that the feedback was not applied. Inspect the
+child before requesting its next correction. A pending durable reservation
+without a child receipt requires inspection; it never authorizes a replay.
diff --git a/docs/run-tool-api.md b/docs/run-tool-api.md
index abac0a3..06a1d45 100644
--- a/docs/run-tool-api.md
+++ b/docs/run-tool-api.md
@@ -1,6 +1,9 @@
-# Run tool API (3.4.1)
+# Run tool API
 
-3.4.1 keeps the five-tool MCP catalog. Submit, status, wait, attention,
+The 3.4.3 additions are role preferences, candidate revisions, and
+compact result/usage evidence. Published 3.4.2 does not expose those additions.
+
+Co-Engineer keeps the five-tool MCP catalog. Submit, status, wait, attention,
 reply, cancel, and cleanup are parameters and modes on `status`, `delegate`,
 `task`, `tasks`, and `cancel`. The preferred bounded-run ingress is the small
 server-compiled `run_request`; the 3.4.0 full `run` envelope remains accepted
@@ -34,12 +37,49 @@ structured/wait/diagnostic/reply/cancel behavior and response shapes.
 | wait | `task` or `tasks` | `run_id` plus `wait_until: "decision_or_attention"` |
 | attention | `task` | `run_id` plus `attention` |
 | reply | `task` | `run_id` plus `run_reply` |
+| revision | `task` | `run_id` plus `revision` |
 | cancel | `cancel` | `run_id` plus optional `assignment_ids` |
 | cleanup | `cancel` | `run_id` plus `cleanup: true` |
 
 `wait_until` remains `progress` and `terminal` for 3.2.1. The additive
 run mode is `decision_or_attention`. Routine progress never wakes.
 
+`task.revision` derives a new bounded correction from a completed, clean,
+exactly identified producer assignment. It preserves provider, model, write
+scope, access, capabilities, and the original assignment constraints for a
+fresh worker, plus correction feedback and the reviewed HEAD. If the combined
+prompt cannot fit the existing 16,384-byte bound, `bounded_context_overflow`
+rejects it before dispatch; constraints are never silently clipped. Public
+admission receipts and the compact coordination packet return the producer
+request identity (`request_idempotency_key`) and unambiguous per-assignment
+HEAD/status. Completed candidates next-action to `review`; `revision` is an
+available capability for a proven clean completed writer. The coordinator
+decides whether findings warrant using it; provider prose does not make that decision. Completed-but-dirty,
+uncertain, or cleanup-incomplete evidence stays unresolved. Active,
+uncertain, dirty, stale, missing, remote, or unfinal producers fail closed
+and are never replayed. Duplicate calls with the same identity, including
+concurrent duplicates, dispatch once. Compact packets include retrievable
+artifact refs when those artifacts exist; identity hashes are not presented
+as retrievable artifacts.
+
+The correction chain has a fixed limit of three admitted rounds and one
+distinct child per producer. The child retains original and immediate producer
+identity, `round`, and `limit`. Repeated identical requests follow that child;
+different feedback is rejected with `revision_child_exists` and the child id,
+explicitly stating that the new feedback was not applied. An admitted
+failure does not replenish a consumed round. `revision_budget_exhausted` requires
+a deliberate new bounded assignment and never dispatches it automatically.
+The production store reserves that child exclusively across MCP processes.
+If a crash leaves a reservation without a child receipt, the operation returns
+`revision_admission_pending`. Inspect the retained state; no automatic replay or
+budget replenishment follows. A deliberate new bounded assignment is a separate
+decision and is not a recovery claim that earlier work never ran.
+
+Normal run replies also contain `result_evidence`; `view: "diagnostics"` requests
+its detailed outcome and usage view. It uses the existing ledger and local
+decision card. Completion is not Codex acceptance; unknown usage stays unknown.
+See [run results](run-results.md) for measurement scope and limits.
+
 Mixing a run body with 3.2.1 `task_id` / `workspace_mode` / `create_pr` /
 `reply` fields fails closed.
 
@@ -71,6 +111,36 @@ and `verify` derive `read_only`. An explicit value must agree with the role.
 Omitting access and supplying its equivalent explicit value produce the same
 normalized request. Multiple writer lanes need explicit disjoint write scopes.
 
+Optional `preferences` reuse provider ownership by role so eligible
+assignments may omit `provider` / `model`. Exact assignment selections win,
+including when they override an unknown role preference. Unknown or
+unavailable preferred providers are reported only when an assignment would
+use them; unused unknown role preferences do not block dispatch. Used
+unknown preferences return a pre-admission result with no persisted run and
+`next_action=resubmit` instead of a fake identity that asks for `reply`.
+Omitted preferences keep the explicit provider path unchanged.
+
+```json
+{
+  "run_request": {
+    "run_id": "vale-hardening",
+    "repo": "/absolute/repository/path",
+    "objective": "Implement and review the hardening plan.",
+    "preferences": {
+      "implement": { "provider": "grok" },
+      "review": { "provider": "cursor-local" }
+    },
+    "assignments": [
+      {
+        "assignment_id": "social-implementation",
+        "role": "implement",
+        "prompt": "Implement the social ingestion slice."
+      }
+    ]
+  }
+}
+```
+
 The server observes the clean exact Git identity, resolves the provider model,
 and derives the request idempotency key, manifest/prompt-envelope/lane
 digests, child and task identities, and managed-workspace policy. Callers
diff --git a/docs/showcase.md b/docs/showcase.md
new file mode 100644
index 0000000..756b421
--- /dev/null
+++ b/docs/showcase.md
@@ -0,0 +1,62 @@
+# OpenAI showcase preparation
+
+Status: a development case study and submission draft for 3.4.3. Publication
+does not complete the remaining qualification described in the [release notes](releases/v3.4.3.md).
+This is not a published release, submitted listing, or claim of OpenAI endorsement.
+
+## The story
+
+**Give Codex a team. Your other coding agents implement, test, and revise;
+Codex reviews the result.**
+
+Co-Engineer lets a Codex task use supported Grok and Cursor agents, and Muse
+through OpenRouter, for bounded engineering assignments. Billing follows each
+provider route; Cloud and API routes do not imply local subscription usage. External agents own implementation and fixes.
+Codex handles the consequential decisions: selecting useful assignments,
+reviewing the exact candidate, resolving conflicting findings, and accepting
+the result. Durable workspaces and concise evidence keep that work inspectable.
+
+The development of this upgrade is the first case study. Review of a real
+deadline implementation found a concurrent-session cancellation defect. The
+external implementation owner corrected it, and Codex independently checked
+the result. See the [recorded development case](demos/ownership-deadline.md).
+This establishes a useful engineering outcome; it does not establish a
+subscription saving or a measured advantage over native Codex helpers.
+
+## Materials for a submission
+
+- Public [repository](https://github.com/ajhcs/Codex-Co-Engineer), supported-host
+  [quickstart](co-engineer-quickstart.md), and [first outcome](../examples/first-outcome/).
+- The recorded case, exact candidate identity, independent checks, and an
+  explanation of what remains unknown in the [result report](run-results.md).
+- A [comparison protocol](../benchmarks/) that counts native helpers,
+  corrections, and failed attempts. Publish matched trials only after running
+  them with an explicit evaluation budget; fixture data is not a benchmark result.
+- [Support](../SUPPORT.md), [contributor tasks](contributor-tasks.md), and a
+  [roadmap](roadmap.md) that welcome reproductions and counterexamples.
+
+Before representing the candidate as a released product, complete the existing
+[release requirements](release.md). Record actual use through the qualified
+host: assignment, implementation, independent review, useful findings,
+correction, and Codex's checked acceptance. Keep original elapsed times on
+screen, label time compression, and redact private repository content and
+account information. The README hero remains a conceptual illustration.
+A development evidence walkthrough must not be labeled a recording of the
+qualified release.
+
+## Distribution and OpenAI route
+
+OpenAI's [community page](https://developers.openai.com/community) offers a
+developer-showcase route for projects, demonstrations, and workflows. Prepare
+the materials above for that conversation; appearing there is not guaranteed.
+
+The [plugin submission documentation](https://developers.openai.com/plugins/deploy/submission)
+currently describes skills-only and remote MCP submissions. Local MCP developers
+who cannot offer the required public HTTPS endpoint are directed to their
+OpenAI contact. Checked September 10, 2026. Co-Engineer's local supervisor
+therefore needs an appropriate local-plugin review/distribution conversation.
+Keep repository-marketplace installation available. Changing a local process
+supervisor into a public service is separate architecture work, not a patch
+release shortcut to portal eligibility.
+
+No listing, message, or showcase submission is sent by preparing these files.
diff --git a/examples/first-outcome/README.md b/examples/first-outcome/README.md
new file mode 100644
index 0000000..d9006f4
--- /dev/null
+++ b/examples/first-outcome/README.md
@@ -0,0 +1,93 @@
+# First outcome example
+
+Tiny public assignment you can copy into a **clean Git repository**. Its local
+acceptance check needs only Node, with no `package.json` or `npm install`.
+Delegating the implementation uses your chosen provider's account and usage.
+
+The shipped library is an **intentionally incomplete stub**. `node check.mjs`
+fails until a provider implements the summarizer. After a useful outcome, the
+same check passes.
+
+## Contents
+
+| File | Role |
+| --- | --- |
+| `lib/summarize-checks.cjs` | Stub to implement: summarize named check JSON |
+| `summarize-checks.mjs` | Local CLI (`stdin` or a file path argument) |
+| `check.mjs` | Frozen deterministic acceptance (do not edit to pass) |
+| `starter-prompt.md` | Ordinary-language request for Codex |
+
+## What the utility does
+
+Input is a JSON array of `{ "name": string, "status": "passed"|"failed"|"skipped" }`.
+Output is deterministic text, for example after a mixed run:
+
+```text
+passed: 1
+failed: 2
+skipped: 1
+failures:
+- unit
+- typecheck
+```
+
+An empty JSON array (`[]`) prints zero counts and an empty `failures:` list.
+Empty stdin is invalid JSON and exits non-zero. Other invalid JSON, missing
+names, or unknown statuses also exit non-zero with an error on stderr.
+
+## Compatibility before providers
+
+On the Co-Engineer host you still need the published local requirements when
+using a local worker: **Linux**, working **`systemd --user`**, **`systemd-run`
+244+**, unified **cgroup v2**, **Node.js 24+**, and **Python 3.11+** for bundled
+setup. Authenticate **one** chosen provider only. Bundled `npm run setup` may
+install shared prerequisites for the package; it does not selectively install
+only the provider you picked.
+
+## Clean Git copy and commit
+
+From a Co-Engineer source checkout, create an empty repository and copy only
+this example (no personal home paths):
+
+```bash
+mkdir first-outcome-demo
+cd first-outcome-demo
+git init
+cp -R /path/to/Codex-Co-Engineer/examples/first-outcome/. .
+git add .
+git commit -m "Add first-outcome starter fixture."
+```
+
+Replace `/path/to/Codex-Co-Engineer` with your local clone of this repository.
+
+## Try it
+
+1. After the copy/commit above, confirm the stub fails acceptance:
+
+```bash
+node check.mjs
+```
+
+Expect a non-zero exit while `summarizeChecks` is unimplemented.
+
+2. In a Codex session, use [starter-prompt.md](starter-prompt.md) with your one
+   chosen provider (for example Grok Co-Engineer). Do not let the worker edit
+   `check.mjs` to pass.
+
+3. When the candidate is ready, run acceptance again:
+
+```bash
+node check.mjs
+```
+
+Expect `first-outcome acceptance passed` and exit 0. You can also exercise the
+CLI directly:
+
+```bash
+printf '%s\n' '[{"name":"lint","status":"passed"},{"name":"unit","status":"failed"}]' \
+  | node summarize-checks.mjs
+```
+
+Do not construct MCP payloads. Speak in ordinary language. Codex remains the
+reviewer. External workers may commit within their assigned scope. Publication
+and merge require user authorization and Codex review.
diff --git a/examples/first-outcome/check.mjs b/examples/first-outcome/check.mjs
new file mode 100644
index 0000000..f419e7c
--- /dev/null
+++ b/examples/first-outcome/check.mjs
@@ -0,0 +1,71 @@
+/**
+ * Frozen acceptance for the first-outcome summarize utility.
+ * Do not edit this file to make the assignment pass — implement lib/summarize-checks.cjs.
+ */
+import assert from 'node:assert/strict';
+import { spawnSync } from 'node:child_process';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const root = path.dirname(fileURLToPath(import.meta.url));
+const cli = path.join(root, 'summarize-checks.mjs');
+
+function run(input) {
+  return spawnSync(process.execPath, [cli], {
+    cwd: root,
+    encoding: 'utf8',
+    input: typeof input === 'string' ? input : JSON.stringify(input),
+  });
+}
+
+function assertSuccess(result, expectedStdout) {
+  assert.equal(result.status, 0, result.stderr || 'expected exit 0');
+  assert.equal(result.stdout, expectedStdout);
+}
+
+function assertFailure(result, pattern) {
+  assert.notEqual(result.status, 0, 'expected non-zero exit');
+  assert.match(`${result.stderr}\n${result.stdout}`, pattern);
+}
+
+// Empty input: zero counts and an empty failures list.
+assertSuccess(
+  run([]),
+  ['passed: 0', 'failed: 0', 'skipped: 0', 'failures:', ''].join('\n'),
+);
+
+// Mixed statuses: count each and list failure names in order.
+assertSuccess(
+  run([
+    { name: 'lint', status: 'passed' },
+    { name: 'unit', status: 'failed' },
+    { name: 'docs', status: 'skipped' },
+    { name: 'typecheck', status: 'failed' },
+  ]),
+  [
+    'passed: 1',
+    'failed: 2',
+    'skipped: 1',
+    'failures:',
+    '- unit',
+    '- typecheck',
+    '',
+  ].join('\n'),
+);
+
+// Invalid JSON.
+assertFailure(run('{'), /invalid JSON/i);
+
+// Unknown status.
+assertFailure(
+  run([{ name: 'lint', status: 'flaky' }]),
+  /unknown status/i,
+);
+
+// Missing name.
+assertFailure(
+  run([{ status: 'passed' }]),
+  /name/i,
+);
+
+process.stdout.write('first-outcome acceptance passed\n');
diff --git a/examples/first-outcome/lib/summarize-checks.cjs b/examples/first-outcome/lib/summarize-checks.cjs
new file mode 100644
index 0000000..28a9560
--- /dev/null
+++ b/examples/first-outcome/lib/summarize-checks.cjs
@@ -0,0 +1,28 @@
+'use strict';
+
+/**
+ * Summarize named check results from a JSON array.
+ *
+ * Each element must be `{ "name": string, "status": "passed"|"failed"|"skipped" }`.
+ * Returns `{ passed, failed, skipped, failures }` where `failures` is the ordered
+ * list of names whose status is `failed`.
+ *
+ * Intentionally incomplete starter stub: replace this body so `node check.mjs` passes.
+ * Do not edit `check.mjs` to force a pass.
+ */
+function summarizeChecks(_checks) {
+  throw new Error('summarizeChecks is not implemented');
+}
+
+function formatSummary(summary) {
+  const lines = [
+    `passed: ${summary.passed}`,
+    `failed: ${summary.failed}`,
+    `skipped: ${summary.skipped}`,
+    'failures:',
+    ...summary.failures.map((name) => `- ${name}`),
+  ];
+  return `${lines.join('\n')}\n`;
+}
+
+module.exports = { summarizeChecks, formatSummary };
diff --git a/examples/first-outcome/starter-prompt.md b/examples/first-outcome/starter-prompt.md
new file mode 100644
index 0000000..e74c6ff
--- /dev/null
+++ b/examples/first-outcome/starter-prompt.md
@@ -0,0 +1,14 @@
+# Starter prompt
+
+Copy into a Codex session after Co-Engineer is installed and one provider is
+authenticated:
+
+> Use Grok Co-Engineer to implement `lib/summarize-checks.cjs` so the local CLI
+> `node summarize-checks.mjs` summarizes named check results from JSON: counts of
+> `passed`, `failed`, and `skipped`, plus the ordered names of failures. Keep the
+> existing CLI and `formatSummary` contract. Make the frozen acceptance
+> `node check.mjs` pass. Do not edit `check.mjs` to force a pass. Commit the
+> result in the assigned workspace.
+
+Replace `Grok` with `Cursor` or `Muse` if that is your chosen provider. Keep the
+same acceptance check.
diff --git a/examples/first-outcome/summarize-checks.mjs b/examples/first-outcome/summarize-checks.mjs
new file mode 100644
index 0000000..924eea8
--- /dev/null
+++ b/examples/first-outcome/summarize-checks.mjs
@@ -0,0 +1,48 @@
+#!/usr/bin/env node
+import { createRequire } from 'node:module';
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const root = path.dirname(fileURLToPath(import.meta.url));
+const require = createRequire(import.meta.url);
+const { summarizeChecks, formatSummary } = require(
+  path.join(root, 'lib', 'summarize-checks.cjs'),
+);
+
+function readInput(argv) {
+  if (argv.length > 0) {
+    return fs.readFileSync(argv[0], 'utf8');
+  }
+  return fs.readFileSync(0, 'utf8');
+}
+
+function main(argv) {
+  let raw;
+  try {
+    raw = readInput(argv);
+  } catch (error) {
+    process.stderr.write(`failed to read input: ${error.message}\n`);
+    process.exitCode = 1;
+    return;
+  }
+
+  let checks;
+  try {
+    checks = JSON.parse(raw);
+  } catch (error) {
+    process.stderr.write(`invalid JSON: ${error.message}\n`);
+    process.exitCode = 1;
+    return;
+  }
+
+  try {
+    const summary = summarizeChecks(checks);
+    process.stdout.write(formatSummary(summary));
+  } catch (error) {
+    process.stderr.write(`${error.message}\n`);
+    process.exitCode = 1;
+  }
+}
+
+main(process.argv.slice(2));
diff --git a/plugins/codex-co-engineer/.codex-plugin/plugin.json b/plugins/codex-co-engineer/.codex-plugin/plugin.json
index d376a5a..7524c7e 100644
--- a/plugins/codex-co-engineer/.codex-plugin/plugin.json
+++ b/plugins/codex-co-engineer/.codex-plugin/plugin.json
@@ -1,6 +1,6 @@
 {
   "name": "codex-co-engineer",
-  "version": "3.4.2",
+  "version": "3.4.3",
   "description": "Give Codex a team of external co-engineers without giving up control. Delegating to Co-Engineer starts one bounded run. The honest shape is up to eight isolated external co-engineers, one bounded run, one coordinated wait, one verified decision.",
   "author": {
     "name": "Codex-Co-Engineer"
diff --git a/plugins/codex-co-engineer/README.md b/plugins/codex-co-engineer/README.md
index 75679aa..7a9a9c9 100644
--- a/plugins/codex-co-engineer/README.md
+++ b/plugins/codex-co-engineer/README.md
@@ -8,13 +8,36 @@ eight independent assignments and returns their results for Codex to inspect.
 You decide what ships.
 
 [Quickstart](docs/co-engineer-quickstart.md) · [Configuration](docs/configuration.md) ·
-[Troubleshooting](docs/co-engineer-troubleshooting.md) · [3.4.2 release notes](docs/releases/v3.4.2.md)
+[Troubleshooting](docs/co-engineer-troubleshooting.md) · [3.4.3 release notes](docs/releases/v3.4.3.md)
 
 > Use Grok Co-Engineer to review the latest change. Report actionable findings.
 
 Speak naturally; you do not need tool payloads, a profile, or another manager
-for an ordinary launch. A separate host panel is optional. The CLI conversation
-is a complete workflow. The stable plugin and MCP identifier is `codex-co-engineer`.
+for an ordinary launch. A separate host panel is optional. Use an interactive
+Codex conversation that can present the normal repository-sharing consent. The stable plugin and MCP identifier is `codex-co-engineer`.
+
+## Complete engineering assignments
+
+The revision operation and result reporting below are available in 3.4.3.
+Automated checks and independent code review passed. Measured workload
+reduction, clean-agent onboarding, and refreshed native-host acceptance remain
+unverified; no savings claim is made here.
+
+Grok and Cursor can own preparation, implementation, meaningful checks, and
+requested corrections. Tell Codex your provider preferences once in the task;
+it can reuse them for eligible assignments while you retain final control.
+Co-Engineer returns concise candidate evidence and supports bounded revisions
+without rebuilding dispatch details. An explicit provider choice takes priority.
+
+The [autonomous ownership guide](skills/delegate-to-co-engineer/references/autonomous-ownership.md)
+explains coordination for Astra and other autonomous agents. Compare total
+native-agent work per accepted result, including native helpers; provider
+readiness does not establish a subscription balance.
+See the [result guide](docs/run-results.md) and the public repository’s
+[contribution guide](https://github.com/ajhcs/Codex-Co-Engineer/blob/main/CONTRIBUTING.md),
+[support routes](https://github.com/ajhcs/Codex-Co-Engineer/blob/main/SUPPORT.md),
+and the
+[first-outcome example](https://github.com/ajhcs/Codex-Co-Engineer/tree/v3.4.3/examples/first-outcome).
 
 ## Install and authentication
 
@@ -27,18 +50,36 @@ is a complete workflow. The stable plugin and MCP identifier is `codex-co-engine
 
 The worktree tool is bundled; no separate `worktree-bootstrap` installation is needed.
 
-### Install from a release clone
+### Install 3.4.3
 
 ```bash
-git clone --branch v3.4.2 --single-branch https://github.com/ajhcs/Codex-Co-Engineer.git
-cd Codex-Co-Engineer
+git clone --branch v3.4.3 --single-branch https://github.com/ajhcs/Codex-Co-Engineer.git Codex-Co-Engineer-3.4.3
+cd Codex-Co-Engineer-3.4.3
 npm --prefix plugins/codex-co-engineer run setup
 codex plugin marketplace add "$PWD"
 codex plugin add codex-co-engineer@codex-co-engineer
 npm --prefix plugins/codex-co-engineer run setup:check
 ```
 
-Keep the clone as the registered marketplace source. Setup installs pinned ACPX
+### Upgrading an existing installation
+
+The public release keeps the marketplace identity `codex-co-engineer`.
+Keep the clone as its registered marketplace source. Finish or cancel active
+runs before replacing an installed version. For an existing installation,
+remove `codex-co-engineer@codex-co-engineer` with `codex plugin remove` before
+adding it again from the new source. Preserve provider login files and durable
+task state.
+
+If older open projects still use that public marketplace identity, use a
+distinct local marketplace wrapper outside the tracked release, with the
+unchanged plugin name and exact released plugin bytes. Remove/re-add alone is
+not sufficient: opening an older project can replace the same-name cache again.
+Do not rename the shipped marketplace manifest to solve a local collision.
+Prefer a clean Codex environment for onboarding. See the
+[release notes](docs/releases/v3.4.3.md) for upgrade details and qualification
+limits.
+
+Setup installs pinned ACPX
 0.13.0, Cursor SDK 1.0.28, and the DSH 0.1.0-rc.7 composition globally. Use a
 user-writable npm global prefix on your `PATH`; a Node version manager is one
 way to provide it. Setup creates key-free DSH profiles and owner-only session
@@ -51,7 +92,7 @@ commands are `npm run setup` and `npm run setup:check`.
 
 | Route | Authentication |
 | --- | --- |
-| Grok | Install the official Grok Build CLI, then `grok login` |
+| Grok | Install the official [Grok Build](https://docs.x.ai/build/overview) CLI, then `grok login` (or `grok login --device-auth` when a browser is unavailable). Subscription login only; no API key is required for a Grok first outcome. |
 | Cursor Local | Install Cursor CLI, then `cursor-agent login` |
 | Cursor Cloud | `CURSOR_API_KEY`, `CURSOR_API_KEY_FILE`, or its owner-only key file |
 | Muse / DSH | From the clone, run `plugins/codex-co-engineer/bin/set-model-api-key` for OpenRouter |
@@ -64,27 +105,27 @@ never include credentials in prompts or tool arguments. See
 
 ### Verify and start
 
-Start a new Codex session and ask: **Show Co-Engineer status.** Then name a
+Start a new Codex session. For a first route, use **one** provider—Grok is the
+default walkthrough—and ask: **Show Co-Engineer status.** Then name that
 provider and describe its first assignment. Setup checks dependencies and DSH
 profiles; the live `status` tool checks provider readiness and the MCP process's
 local Linux boundary. Setup does not install or authenticate Grok or Cursor.
 
 ### Upgrade
 
-Finish or cancel active runs, then update your clean registered source clone:
+Finish or cancel active runs first. Preserve dirty development checkouts and
+use a clean clone of `v3.4.3`, following the installation instructions above.
+Keep the registered source and local marketplace identity consistent; older
+open projects with the same identity can replace the shared plugin cache.
+Use a distinct local wrapper when required, preserving the public manifest and
+exact released plugin bytes.
 
-```bash
-git fetch origin tag v3.4.2
-git switch --detach v3.4.2
-npm --prefix plugins/codex-co-engineer run setup
-codex plugin remove codex-co-engineer@codex-co-engineer
-codex plugin add codex-co-engineer@codex-co-engineer
-npm --prefix plugins/codex-co-engineer run setup:check
-```
-
-Restart the Codex session. Use the identity from `codex plugin list` if your
-marketplace name differs. Preserve dirty source clones and existing task state.
-Direct Meta Muse profiles need the [OpenRouter migration](docs/releases/v3.4.2.md#upgrading).
+Start a new Codex session, then check Co-Engineer status. Use the identity from
+`codex plugin list` if it differs. Verify project-scoped discovery and installed
+file persistence after a connection restart. Existing task receipts and provider
+accounts are retained. Direct Meta Muse profiles require the unchanged
+OpenRouter migration; see the [upgrade notes](docs/releases/v3.4.3.md#upgrading)
+and historical [3.4.2 notes](docs/releases/v3.4.2.md#upgrading).
 
 ## Execution and safety model
 
@@ -151,14 +192,22 @@ are visible to that process.
 **Where should I run setup?**
 From this package directory (`plugins/codex-co-engineer` in a clone), or
 with `npm --prefix plugins/codex-co-engineer run setup` from the
-repository root. The copy/paste plugin registration from the repository root
-is:
+repository root. Registration from the repository root uses the stable
+marketplace identity `codex-co-engineer` for both 3.4.2 and 3.4.3:
 
 ```bash
 codex plugin marketplace add "$PWD"
 codex plugin add codex-co-engineer@codex-co-engineer
 ```
 
+Prefer a clean Codex installation for onboarding. A separate clean
+environment remains valid for clean onboarding. If older open projects still
+use the public marketplace identity, finish or cancel active runs, then create a
+distinct local marketplace wrapper outside the tracked candidate with the
+unchanged plugin name and exact tested plugin bytes. Remove/re-add alone is not
+sufficient because opening an older project can replace the same-name cache
+again. Historical notes alone do not preserve the current host gate.
+
 **A managed worktree appeared without a receipt.**
 Do not guess or delete it. Inspect `git worktree list` and
 `worktree-bootstrap lock inspect`, then clean only an exact identified
@@ -235,7 +284,7 @@ keep exact 3.2.1 single-task behavior. Run wait is a bounded
 `decision_or_attention` wait. See
 [the run tool API](docs/run-tool-api.md).
 
-For a bounded 3.4.2 run, `delegate` accepts the small semantic
+For a bounded 3.4.3 run, `delegate` accepts the small semantic
 `run_request` body. The server derives the clean Git identity, provider
 model, task/workspace/dispatch identities, prompt and manifest digests, and
 managed-workspace policy. Do not construct the legacy full `run` envelope or
diff --git a/plugins/codex-co-engineer/assets/acpx-runtime.manifest.json b/plugins/codex-co-engineer/assets/acpx-runtime.manifest.json
index 9481ce4..db5c341 100644
--- a/plugins/codex-co-engineer/assets/acpx-runtime.manifest.json
+++ b/plugins/codex-co-engineer/assets/acpx-runtime.manifest.json
@@ -1,7 +1,7 @@
 {
   "schema": 1,
   "bundle": "acpx-runtime.mjs",
-  "bundle_sha512": "sha512-x+vqruKkvLflf6Ef/8NmXfN2X2+3M7o9sVdI/YTWejlphXSGUlLNIpv+BylInQkep8fq9Z9HO79vjny+0zJM6g==",
+  "bundle_sha512": "sha512-7PlHWX7vbzSOhQcmdKNHC9HuR62+1zUFqMidizfS8fqOfxNoK4jrVUDdY2Z7xiSzIAxMZ6cBwXgLsRVOtru1fA==",
   "exports": [
     "createAcpRuntime",
     "createAgentRegistry",
@@ -17,7 +17,7 @@
   },
   "hardening_overlay": {
     "path": "tools/acpx-vendor/src/hardening-overlay.mjs",
-    "sha512": "sha512-gCOwrvbgkEVhuvT28X+mPkaeOpnGOgyrVf3K1RtGOP2Pz7XTRob5jN4dC0tvJjahf+wTVy6AQwx9/bCU+vqM6g==",
+    "sha512": "sha512-0nt3d5bylj7/g/ghBzkHmTPfsk1RnT8NzRnutpHCyst3n7eLnTlT/vkejXdPFoqdwo+9735qbZamYl0CveGHDA==",
     "application": "append_after_upstream_bundle"
   },
   "bundled_packages": [
diff --git a/plugins/codex-co-engineer/assets/acpx-runtime.mjs b/plugins/codex-co-engineer/assets/acpx-runtime.mjs
index b3e1413..4c9c817 100644
--- a/plugins/codex-co-engineer/assets/acpx-runtime.mjs
+++ b/plugins/codex-co-engineer/assets/acpx-runtime.mjs
@@ -559,3 +559,133 @@ AcpClient.prototype.killAgentIfRunning = async function coEngineerKillAgentIfRun
   }
   return coEngineerWaitForAgentTree(child, waitMs);
 };
+
+/*
+ * Turn deadlines must stay extensible. Upstream runPromptTurn races the prompt
+ * against a fixed withTimeout; when that timer fires after any agent reply it
+ * fabricates {stopReason:'end_turn',source:'session'}, which the manager
+ * records as a completed turn. Co-Engineer therefore:
+ *   1. races the prompt against the turn AbortSignal (worker-owned deadline)
+ *   2. never promotes TimeoutError / interrupt into a synthetic end_turn
+ * Session startup and bounded cleanup keep using their own withTimeout paths.
+ *
+ * The turn signal is propagated with AsyncLocalStorage so overlapping turns
+ * (and managers) cannot overwrite each other's AbortSignal across awaits.
+ * A module-global would race: turn B could steal turn A's signal, or A's
+ * finally could restore a stale value while B is still awaiting.
+ */
+const { AsyncLocalStorage: CoEngineerAsyncLocalStorage } = process.getBuiltinModule('node:async_hooks');
+const coEngineerTurnSignalStore = new CoEngineerAsyncLocalStorage();
+
+/*
+ * Upstream settles turn.result before finalizeRuntimeTurn retains (or closes)
+ * the persistent client. Callers that await result then close() race an empty
+ * pendingPersistentClients map, so close returns without terminating the ACP
+ * agent or its detached descendants. Defer settlement until after the upstream
+ * turn task — including finalize — completes so retention precedes result.
+ */
+const coEngineerOriginalRunRuntimeTurnTask = AcpRuntimeManager.prototype.runRuntimeTurnTask;
+AcpRuntimeManager.prototype.runRuntimeTurnTask = function coEngineerRunRuntimeTurnTask(task) {
+  const originalSettleResult = task.settleResult;
+  let deferredSettlement;
+  task.settleResult = (next) => {
+    if (deferredSettlement === undefined) deferredSettlement = next;
+  };
+  return coEngineerTurnSignalStore.run(task?.input?.signal ?? null, async () => {
+    try {
+      await coEngineerOriginalRunRuntimeTurnTask.call(this, task);
+    } finally {
+      if (deferredSettlement !== undefined) originalSettleResult(deferredSettlement);
+    }
+  });
+};
+
+/*
+ * finalizeRuntimeTurnRecord samples refreshClosedState, then awaits
+ * sessionStore.save before retainPersistentClientAfterTurn. close() can finish
+ * in that gap: it persists closed=true on a freshly loaded record, but
+ * finalization still holds a stale not-closed decision, overwrites the stored
+ * snapshot, and retains the live client. Refuse retain after close intent
+ * (closingActiveRecords / closed) and re-persist the closed snapshot after
+ * that save.
+ */
+const coEngineerOriginalRetainPersistentClientAfterTurn = AcpRuntimeManager.prototype.retainPersistentClientAfterTurn;
+AcpRuntimeManager.prototype.retainPersistentClientAfterTurn = async function coEngineerRetainPersistentClientAfterTurn(input) {
+  if (input.record.closed || this.closingActiveRecords.has(input.record.acpxRecordId)) return false;
+  return coEngineerOriginalRetainPersistentClientAfterTurn.call(this, input);
+};
+
+const coEngineerOriginalFinalizeRuntimeTurnRecord = AcpRuntimeManager.prototype.finalizeRuntimeTurnRecord;
+AcpRuntimeManager.prototype.finalizeRuntimeTurnRecord = async function coEngineerFinalizeRuntimeTurnRecord(turn) {
+  const retained = await coEngineerOriginalFinalizeRuntimeTurnRecord.call(this, turn);
+  const closed = await this.refreshClosedState(turn.record);
+  if (!closed) return retained;
+  if (retained) await this.closePendingPersistentClient(turn.record.acpxRecordId);
+  await this.options.sessionStore.save(turn.record).catch(() => {});
+  return false;
+};
+
+async function coEngineerAwaitPromptWithDeadline(promise, { timeoutMs, signal } = {}) {
+  const hasTimeout = timeoutMs != null && timeoutMs > 0;
+  const hasSignal = signal != null;
+  if (!hasTimeout && !hasSignal) return await promise;
+  return await new Promise((resolve, reject) => {
+    let settled = false;
+    let timer;
+    let abortTimer;
+    const cleanup = () => {
+      if (timer) clearTimeout(timer);
+      if (abortTimer) clearTimeout(abortTimer);
+      if (hasSignal) signal.removeEventListener('abort', onAbort);
+    };
+    const finish = (callback, value) => {
+      if (settled) return;
+      settled = true;
+      cleanup();
+      callback(value);
+    };
+    const onAbort = () => {
+      // Let session/cancel settle cooperatively before forcing a turn failure.
+      // Hostile agents that ignore cancel still fail after this short grace.
+      abortTimer = setTimeout(() => finish(reject, new InterruptedError()), 200);
+    };
+    // Observe the prompt before any early abort path so a pre-aborted signal
+    // or hostile late settlement cannot become an unhandled rejection.
+    promise.then(
+      (value) => finish(resolve, value),
+      (error) => finish(reject, error),
+    );
+    if (signal?.aborted) {
+      finish(reject, new InterruptedError());
+      return;
+    }
+    if (hasSignal) signal.addEventListener('abort', onAbort, { once: true });
+    if (hasTimeout) {
+      timer = setTimeout(() => finish(reject, new TimeoutError(timeoutMs)), timeoutMs);
+    }
+  });
+}
+
+runPromptTurn = async function coEngineerRunPromptTurn(params) {
+  const promptPromise = params.client.prompt(params.sessionId, params.prompt);
+  try {
+    await params.onPromptStarted?.();
+    const response = await coEngineerAwaitPromptWithDeadline(promptPromise, {
+      timeoutMs: params.timeoutMs,
+      signal: params.signal ?? coEngineerTurnSignalStore.getStore(),
+    });
+    await params.client.waitForSessionUpdatesIdle?.({
+      idleMs: SESSION_REPLY_IDLE_MS,
+      timeoutMs: SESSION_REPLY_DRAIN_TIMEOUT_MS,
+    }).catch(() => {});
+    recordPromptResponseUsage(params.conversation, response.usage, params.promptMessageId);
+    return { stopReason: response.stopReason, source: 'rpc' };
+  } catch (error) {
+    // Absorb late prompt settlement after interrupt/timeout; never replay.
+    void promptPromise.then(() => {}, () => {});
+    if (error instanceof InterruptedError) {
+      return { stopReason: 'cancelled', source: 'signal' };
+    }
+    throw error;
+  }
+};
diff --git a/plugins/codex-co-engineer/docs/co-engineer-quickstart.md b/plugins/codex-co-engineer/docs/co-engineer-quickstart.md
index c8a5c8b..84a6dc3 100644
--- a/plugins/codex-co-engineer/docs/co-engineer-quickstart.md
+++ b/plugins/codex-co-engineer/docs/co-engineer-quickstart.md
@@ -2,15 +2,48 @@
 
 Give Codex a team of external co-engineers without giving up control.
 
-This is the 60-second path after
+Start with **compatibility**, then **one chosen provider**, then one useful
+first outcome. Speak in ordinary language. You do not write tool payloads.
+
+## 1. Confirm the host
+
+Local Grok, Cursor Local, and Muse workers need:
+
+- Linux with a working `systemd --user` manager
+- `systemd-run` 244 or newer and unified cgroup v2
+- Node.js 24+
+- Python 3.11+ for bundled setup
+- A current Codex CLI with plugin support
+
+Cursor Cloud runs remotely and does not need that local process boundary.
+
+Follow
 [install and authentication](../README.md#install-and-authentication).
-Speak in ordinary language. You do not write tool payloads.
+Bundled setup may install **shared** package prerequisites. Authenticate only
+the **one** provider you plan to use first. Do not assume setup installs
+providers selectively.
 
 Start a **new** Codex session after the plugin add. Any extra Co-Engineer
-panel is optional, feature-detected, and host-specific. If this host has
-no panel, keep talking in Codex CLI. That headless path is complete.
+panel is optional, feature-detected, and host-specific. If this host has no
+panel, use the interactive Codex CLI with normal repository-sharing consent.
+Non-interactive evaluation did not complete that consent path; it is not
+validated as an unattended onboarding route.
+
+## 2. One useful first outcome
+
+From the **v3.4.3** source clone, copy `examples/first-outcome` into a clean
+Git repository (see that folder's README). Then ask Codex with your chosen
+provider—Grok is the default first route:
 
-## Delegate one assignment
+> Use Grok Co-Engineer to implement `lib/summarize-checks.cjs` so
+> `node summarize-checks.mjs` summarizes named check JSON (passed / failed /
+> skipped counts and failure names) and make the frozen `node check.mjs`
+> pass without editing the checker. Commit the result.
+
+Replace Grok with Cursor or Muse when that is your provider. Acceptance is
+local and deterministic: `node check.mjs`. No MCP payloads.
+
+## 3. Delegate one assignment
 
 You:
 
@@ -31,20 +64,21 @@ Codex waits once. When the work is complete, Codex inspects it:
 You still decide whether to keep, change, or discard the result. That
 sentence is Codex's review, not a merge, push, or pull request.
 
-## Delegate several independent assignments
+## 4. Independent assignments and review order
 
-Independent means the assignments do not share a writer path. The bound
-is eight. This is still one bounded run and one coordinated wait.
+Independent means the assignments do not share a writer path. The bound is
+eight. This is still one bounded run and one coordinated wait.
 
 You:
 
-> Split this into three isolated independent assignments: API
-> validation, the operator guide, and a review of both diffs.
+> Use Grok for API validation and Muse for the operator guide in two
+> isolated assignments. Once both finish, have Cursor review the integrated
+> candidate.
 
 Codex:
 
-> I am delegating this to Co-Engineer. Co-Engineer is preparing 3
-> independent assignments.
+> I am delegating this to Co-Engineer. Co-Engineer is preparing 2
+> independent assignments. I will arrange review after integration.
 
 The first card says `preparing` until every required lane has authoritative
 prompt-dispatch evidence; only then does it say `running`.
@@ -57,12 +91,23 @@ Name co-engineers when you care which route takes which assignment:
 Codex:
 
 > I am delegating this to Co-Engineer. Using Grok Co-Engineer.
-> Using Muse Co-Engineer. Using Cursor Co-Engineer. Co-Engineer is
-> preparing 3 assignments.
+> Using Muse Co-Engineer. Co-Engineer is preparing 2 assignments.
+> Cursor will review the resulting candidate in a subsequent assignment.
+
+For multi-provider recipes, **review the resulting immutable candidate**. Do
+not run a dependent review concurrently against the shared base while writers
+are still producing it.
 
-## Ask once when nothing is named
+Version 3.4.3 adds provider preferences and `task.revision`.
+Published 3.4.2 uses explicit fresh assignments for completed-candidate fixes.
 
-If you want a team and have no saved profile and no named co-engineers:
+Provider preferences on a run request reuse ownership **for that request** by
+role. Exact assignment provider or model choices win. Preferences are not
+saved global Codex settings.
+
+## 5. Ask once when nothing is named
+
+If no provider choice is available from the request or earlier conversation:
 
 You:
 
@@ -82,10 +127,11 @@ Codex:
 > I am delegating this to Co-Engineer. Using Grok Co-Engineer.
 > Using Muse Co-Engineer. Co-Engineer is preparing 2 assignments.
 
-## Chat with existing work
+## 6. Chat, correct, or cancel
 
-`Chatting with Co-Engineer` never starts a run. It inspects, continues,
-answers grouped attention, or cancels work that already exists.
+`Chatting with Co-Engineer` manages an existing assignment: inspect,
+continue, answer grouped attention, or cancel. Unrelated new work needs an
+explicit new delegation, not chat.
 
 If Codex groups questions from more than one assignment:
 
@@ -93,6 +139,10 @@ If Codex groups questions from more than one assignment:
 
 Answer once. That is not a second delegation.
 
+To correct a **completed** candidate, ask Codex to return bounded findings to
+the same external owner. That uses a fresh scoped `task.revision`, not a
+terminal `run_reply`. `run_reply` is for pending questions or consent only.
+
 If a required assignment fails or stays unresolved, Codex does not say
 Co-Engineer finished, and I verified the candidate. You may cancel:
 
@@ -103,8 +153,9 @@ Co-Engineer finished, and I verified the candidate. You may cancel:
 The honest shape is up to eight isolated external co-engineers, one
 bounded run, one coordinated wait, one verified decision.
 
-Codex remains chief engineer and reviewer. External workers may commit within
-their assigned scope. Publication and merge require user authorization and Codex review.
+The public MCP catalog remains five tools: `status`, `delegate`, `task`,
+`tasks`, and `cancel`. Codex remains chief engineer and reviewer.
+External workers may commit within their assigned scope. Publication and merge require user authorization and Codex review.
 Review exact commit and tree identities, verification results, and current CI
 before integration. The user retains version, tag, release, and protected-ref authority.
 
diff --git a/plugins/codex-co-engineer/docs/co-engineer-troubleshooting.md b/plugins/codex-co-engineer/docs/co-engineer-troubleshooting.md
index f5e221d..18544e3 100644
--- a/plugins/codex-co-engineer/docs/co-engineer-troubleshooting.md
+++ b/plugins/codex-co-engineer/docs/co-engineer-troubleshooting.md
@@ -51,6 +51,15 @@ codex plugin marketplace add LOCAL_ROOT
 codex plugin add codex-co-engineer@codex-co-engineer
 ```
 
+When older open projects still use the public marketplace identity
+`codex-co-engineer`, create that local marketplace wrapper outside the tracked
+candidate with the unchanged plugin name and exact tested plugin bytes.
+Remove/re-add alone is not sufficient because opening an older project can
+replace the same-name cache again. Verify project-scoped `plugin/list`
+inventory and persistence after a connection restart. A separate clean Codex
+environment remains valid for clean onboarding. Keep the shipped
+`.agents/plugins/marketplace.json` unchanged.
+
 Treat client-to-host resync as suspected until versions or file hashes confirm
 it. Do not add an auto-repair cron, replace the cache with a symlink, or disable
 unrelated configuration to mask the problem.
@@ -95,7 +104,9 @@ natural language and do not replay the prompt automatically.
 No. Use normal provider login or the owner-only key files. Credentials
 must not appear in MCP arguments, prompts, receipts, fixtures, or Git.
 
-- Grok: `grok login`
+- Grok: `grok login`, or `grok login --device-auth` when a browser is
+  unavailable. Subscription login only; no API key is required for a Grok
+  first outcome.
 - Cursor Local: `cursor-agent login`
 - Muse and optional Ox Alpha: `OPENROUTER_API_KEY`,
   `CODEX_CO_ENGINEER_OPENROUTER_API_KEY_FILE`, or
diff --git a/plugins/codex-co-engineer/docs/configuration.md b/plugins/codex-co-engineer/docs/configuration.md
index 3c1be3b..cfb821f 100644
--- a/plugins/codex-co-engineer/docs/configuration.md
+++ b/plugins/codex-co-engineer/docs/configuration.md
@@ -266,12 +266,13 @@ Muse. Codex does not invent a default router.
 
 ## Authentication
 
-Authenticate Grok and Cursor Local with their normal CLIs. DSH Muse and DSH
-Ox Alpha use the owner-only OpenRouter key, and Cursor Cloud uses its normal
-API key. Credentials
-must not be placed in MCP arguments, prompts, receipts, fixtures, or
-Git. Provider login state persists in the provider's normal user
-configuration between Codex tasks.
+Authenticate Grok and Cursor Local with their normal CLIs. For Grok, run
+`grok login`, or `grok login --device-auth` when a browser is unavailable.
+Grok first-outcome work uses subscription login; no API key is required.
+DSH Muse and DSH Ox Alpha use the owner-only OpenRouter key, and Cursor Cloud
+uses its normal API key. Credentials must not be placed in MCP arguments,
+prompts, receipts, fixtures, or Git. Provider login state persists in the
+provider's normal user configuration between Codex tasks.
 
 ## State and retention
 
diff --git a/plugins/codex-co-engineer/docs/efficient-dogfood.md b/plugins/codex-co-engineer/docs/efficient-dogfood.md
index 2608f07..5272ad0 100644
--- a/plugins/codex-co-engineer/docs/efficient-dogfood.md
+++ b/plugins/codex-co-engineer/docs/efficient-dogfood.md
@@ -1,6 +1,15 @@
 # Efficient Codex-Co-Engineer dogfood workflow
 
-This workflow for Codex-Co-Engineer 3.2.0 minimizes coordination calls and
+For current semantic runs, read
+`skills/delegate-to-co-engineer/references/autonomous-ownership.md` and
+`skills/delegate-to-co-engineer/references/launch.md` inside the installed plugin
+(`plugins/codex-co-engineer/` in a source clone), plus the [run API](run-tool-api.md). Delegate preparation, implementation, tests and
+corrections together, retain provider preferences, and use compact candidate
+evidence at the review boundary. Measure parent plus native-child usage per
+accepted result; moving work from Astra to a native helper does not measure
+external-capacity utilization. Missing provider usage stays unknown.
+
+The compatible 3.2.0 workflow below minimizes coordination calls and
 repeated receipt content without weakening Codex's review and merge
 authority. The core pattern is:
 
diff --git a/plugins/codex-co-engineer/docs/releases/v3.4.3.md b/plugins/codex-co-engineer/docs/releases/v3.4.3.md
new file mode 100644
index 0000000..d35c341
--- /dev/null
+++ b/plugins/codex-co-engineer/docs/releases/v3.4.3.md
@@ -0,0 +1,157 @@
+# Codex-Co-Engineer 3.4.3
+
+Released 2026-09-11 with **partial qualification**, at the maintainer's
+direction. External ownership, independent review, corrections, and Codex
+acceptance were demonstrated on real implementation work. Automated release
+checks and GitHub CI passed; publication does not establish measured savings.
+
+The comparison has **zero valid matched results**. Its first attempt was
+retained as invalid because inherited host instructions exposed later
+implementation context; normal non-interactive consent also did not complete.
+Clean-environment agent onboarding, refreshed native-host provider acceptance,
+and Desktop wait/recovery checks remain incomplete. These requirements remain
+in the release process and are follow-up qualification work, not passed gates.
+See the [public evidence on PR43](https://github.com/ajhcs/Codex-Co-Engineer/pull/43#issuecomment-5637539472)
+for failures, limitations, and the separately reported setup accounting.
+
+[Installation](../../README.md#install-and-authentication) ·
+[Configuration](../configuration.md) · [Troubleshooting](../co-engineer-troubleshooting.md) ·
+[Release process](https://github.com/ajhcs/Codex-Co-Engineer/blob/main/docs/release.md)
+
+## Highlights
+
+| Before | With 3.4.3 |
+| --- | --- |
+| Corrections and checks often return to the lead agent | Bounded external ownership keeps implementation, checks, and up to three correction rounds with the producer |
+| Completion can be mistaken for acceptance or savings | Ordinary results expose compact evidence; unknown usage stays unknown; no invented savings claim |
+| Extended deadlines did not always govern the active turn | Supported deadline extensions govern the active ACP turn and keep timeout/cancellation truthful |
+| New contributors lacked a first outcome and evaluation path | Onboarding example, support routes, contributor tasks, frozen cases, and an offline analyzer |
+
+## Ownership and corrections
+
+Delegate complete engineering assignments—preparation, implementation,
+meaningful checks, and requested corrections—to the external owner. Codex and
+other lead agents retain independent review and final acceptance.
+
+- Role preferences and an explicit provider choice preserve ownership for that
+  request; they do not infer balances or silently replace an active worker.
+- `task.revision` returns bounded findings to the same owner and scope within
+  the existing five-tool catalog (`status`, `delegate`, `task`, `tasks`,
+  `cancel`).
+- Correction chains cap at three rounds. Duplicate or conflicting feedback is
+  explicit; identical repeated requests stay safe without prompt replay.
+- One admitted child per producer is reserved across server processes, with
+  lineage retained through restart.
+
+## Truthful evidence
+
+Ordinary run replies include compact `result_evidence` tied to the existing
+usage ledger and decision-card helpers.
+
+- Show measured submissions, available elapsed time, candidate identity, and
+  review state when known.
+- Unknown usage stays unknown. Completion is never Codex acceptance.
+- Do not convert native tokens into subscription dollars or invent percentage
+  savings from fixtures.
+- [PR43](https://github.com/ajhcs/Codex-Co-Engineer/pull/43) retains the real
+  development evidence and unsuccessful evaluation attempt. Actual matched
+  measurements remain pending under the published budget rules; development
+  cases and synthetic fixtures do not establish workload reduction.
+
+## Deadline fix
+
+Supported deadline extensions govern the active ACP turn, including concurrent
+sessions and late provider output. Timeout and cancellation remain truthful
+after partial provider output. Direct terminal uncertainty to inspection and
+keep active work on bounded waits.
+
+ACP results now settle after persistent-client finalization, so an immediate
+runtime close can clean up the retained agent and its descendants. Cursor
+corrected a real CI cleanup failure through two owned revisions; Grok checked
+the final commit independently, including stress checks and a regression that
+fails against the prior runtime. Astra accepted the correction.
+
+## Onboarding and contributor package
+
+- One-provider first-outcome example under `examples/first-outcome` in the
+  v3.4.3 source. Clean-agent completion remains unverified.
+- Issue forms, PR template, `SUPPORT.md`, contributor tasks, and a roadmap that
+  separates this adoption package from later work.
+- Frozen comparison cases and an offline analyzer that count native helpers,
+  corrections, and failed attempts. Synthetic fixtures do not establish savings.
+- OpenAI showcase preparation notes the current local-MCP submission limitation
+  without submitting a listing.
+
+## Upgrading
+
+### Install the published tag
+
+Finish or cancel active runs before upgrading. Preserve a dirty development
+clone and install from a separate clean clone:
+
+```bash
+git clone --branch v3.4.3 --single-branch https://github.com/ajhcs/Codex-Co-Engineer.git Codex-Co-Engineer-3.4.3
+cd Codex-Co-Engineer-3.4.3
+npm --prefix plugins/codex-co-engineer run setup
+codex plugin marketplace add "$PWD"
+codex plugin add codex-co-engineer@codex-co-engineer
+npm --prefix plugins/codex-co-engineer run setup:check
+```
+
+Keep this clone as the registered marketplace source. For an existing public
+installation, remove `codex-co-engineer@codex-co-engineer` with `codex plugin
+remove` before adding it again from this new source. Start a new Codex session
+and ask for Co-Engineer status. Historical compatibility and the previous
+release remain documented in the [3.4.2 notes](v3.4.2.md).
+
+The public release keeps the marketplace identity `codex-co-engineer` in the
+shipped manifest. Prefer a clean Codex environment for onboarding. If older
+open projects share that identity, create a distinct local marketplace wrapper
+outside the tracked release, with the unchanged plugin name and exact released
+plugin bytes. Remove/re-add alone is not sufficient: opening an older project
+can replace the same-name cache again. Do not rename the shipped manifest to
+solve a local collision.
+
+### From an already-installed local 3.4.3 candidate
+
+Finish or cancel active runs. If older open projects still share the public
+marketplace identity, refresh through a distinct local marketplace wrapper
+outside the tracked candidate (unchanged plugin name and exact tested bytes),
+then restart the Codex session. Remove/re-add alone may not survive opening an
+older same-identity project. Do not assume the version string proves that the
+currently running MCP process contains the new build. Existing durable state
+retains its prior directory identity for compatibility. Do not delete task
+state or provider login files as an upgrade step.
+
+### Muse OpenRouter migration
+
+Users still on a direct Meta Muse profile must migrate to OpenRouter as
+documented for [3.4.2](v3.4.2.md#migrating-a-direct-meta-muse-profile). That
+migration is unchanged in 3.4.3.
+
+## Compatibility
+
+The public MCP catalog remains exactly five tools. No new MCP tools, quota
+router, or automatic balance routing ship in 3.4.3. Published 3.4.2
+behavior remains the baseline for arms that intentionally install that release.
+Cursor compatibility package versioning is independent and is not bumped here.
+
+## Requirements and known limits
+
+- Node.js 24+, Git, Python 3.11+ for bundled setup, and Codex plugin support are
+  required. The release gate runs on Node.js 24 for reproducibility.
+- Local providers require Linux, a working `systemd --user` manager,
+  `systemd-run` 244+, unified cgroup v2, and Python 3.11+ for the bundled
+  worktree tool. Lifecycle control is not a sandbox.
+- Publication is not a substitute for host acceptance, clean-environment
+  agent onboarding evidence, or the budgeted comparison cohort.
+- Missing evaluation evidence is inconclusive; it is not a pass.
+
+## Validation
+
+Keep every existing exact-candidate gate, CI, host, and native-run acceptance
+requirement in [the release process](https://github.com/ajhcs/Codex-Co-Engineer/blob/main/docs/release.md). Additional 3.4.3 evaluation
+rules there cover the $25 TOTAL API/Cloud cap, seed43 cohort shape, accounting,
+acceptance thresholds (including Astra own-output versus published 3.4.2; helpers
+do not satisfy), and clean-environment onboarding. Do not treat provider-free
+fixture suites or this document as live provider proof.
diff --git a/plugins/codex-co-engineer/docs/run-results.md b/plugins/codex-co-engineer/docs/run-results.md
new file mode 100644
index 0000000..0ec1da2
--- /dev/null
+++ b/plugins/codex-co-engineer/docs/run-results.md
@@ -0,0 +1,75 @@
+# Understand a Co-Engineer result
+
+In 3.4.3, ordinary run replies include a compact `result_evidence`
+view. Ask Codex what finished, what needs review, and which decision comes next.
+Ask for the run's diagnostics when you need the detailed outcome and usage
+report. This uses the existing `task` tool with `view: "diagnostics"`.
+
+## What finished?
+
+The result distinguishes work in progress, completed work needing review,
+failed work, and unresolved evidence. A completed provider job does not mean
+Codex accepted its changes. A provider's PASS message does not prove a check
+passed. Codex reviews the exact candidate and makes the acceptance decision
+in the conversation; the tool does not accept or merge code automatically.
+
+The coordination packet keeps each producer's exact head and request identity.
+Independent branches are not described as one composed candidate. Existing
+handoffs and bounded provider results remain available beside the result
+card. Missing checks or composition evidence stay unknown.
+
+For corrections, follow the returned revision run ID. The original producer,
+reviewed head, correction round, and existing child are retained. The fixed
+limit is three successive correction rounds, with one distinct admitted child
+per producer. An exhausted loop requires a deliberate new bounded assignment;
+it never automatically starts one.
+
+## What did this run use?
+
+The report uses the existing usage ledger. The ordinary admission path derives
+a bounded snapshot from its retained facts:
+
+| Fact | Meaning |
+| --- | --- |
+| Submissions | One semantic run submission, counted once across its assignments |
+| Provider invocations | Positively acknowledged dispatches; attempted but unacknowledged work remains unknown |
+| Attention rounds | The admission runtime's recorded attention count |
+| Elapsed time | Recorded time to the terminal handoff, including coordination delay; unknown while unavailable |
+| Provider tokens and cost | Unknown on this path unless a separately bound ledger supplies them |
+| Native tokens, helpers, and subscription balance | Unknown; the plugin does not read private host accounting |
+| Tool calls and response/evidence bytes | Unknown where the runtime has not instrumented the complete quantity |
+
+Run-wide counters contribute once to ledger totals. They are not measurements
+of an individual provider's latency. Re-reading or restarting does not turn
+cumulative observations into extra work. This report covers the current run;
+it does not silently combine previous producers, revisions, or native helpers.
+Compare the complete sequence when evaluating an outcome.
+
+The ledger distinguishes host measurements, provider reports, evidence bytes,
+and unknown values. Bytes are not tokens. Provider reports do not become host
+measurements. Unlike provider/model token counts must remain distinguishable.
+One run cannot establish savings against a workflow that was never measured.
+
+## Sharing and reproducing evidence
+
+The bounded result projection omits raw prompts, transcripts, and worktree
+paths. Review identifiers and any selected evidence before posting a report;
+a useful task name may still reveal private context. Nothing is published
+automatically. Use the repository's support route to share the relevant
+summary and your description of the problem.
+
+The [run API](run-tool-api.md) describes the machine fields. In a source clone,
+`benchmarks/README.md` describes case preparation and offline comparisons,
+including native helpers, corrections, failed attempts, and missing metrics.
+Paid comparisons need an explicit evaluation budget. Supplied fixture data
+demonstrates the analyzer and is not a measured performance result.
+
+The underlying helpers are `projectRunResultEvidenceV1`, `projectUsageReportV1`,
+and `projectLocalOutcomeCardV1`. The existing PR/CI decision card retains its
+separate exact-candidate requirements. The public catalog remains `status`,
+`delegate`, `task`, `tasks`, and `cancel`.
+
+Different feedback against a producer with an admitted child is rejected with
+that child's id and a statement that the feedback was not applied. Inspect the
+child before requesting its next correction. A pending durable reservation
+without a child receipt requires inspection; it never authorizes a replay.
diff --git a/plugins/codex-co-engineer/docs/run-tool-api.md b/plugins/codex-co-engineer/docs/run-tool-api.md
index abac0a3..06a1d45 100644
--- a/plugins/codex-co-engineer/docs/run-tool-api.md
+++ b/plugins/codex-co-engineer/docs/run-tool-api.md
@@ -1,6 +1,9 @@
-# Run tool API (3.4.1)
+# Run tool API
 
-3.4.1 keeps the five-tool MCP catalog. Submit, status, wait, attention,
+The 3.4.3 additions are role preferences, candidate revisions, and
+compact result/usage evidence. Published 3.4.2 does not expose those additions.
+
+Co-Engineer keeps the five-tool MCP catalog. Submit, status, wait, attention,
 reply, cancel, and cleanup are parameters and modes on `status`, `delegate`,
 `task`, `tasks`, and `cancel`. The preferred bounded-run ingress is the small
 server-compiled `run_request`; the 3.4.0 full `run` envelope remains accepted
@@ -34,12 +37,49 @@ structured/wait/diagnostic/reply/cancel behavior and response shapes.
 | wait | `task` or `tasks` | `run_id` plus `wait_until: "decision_or_attention"` |
 | attention | `task` | `run_id` plus `attention` |
 | reply | `task` | `run_id` plus `run_reply` |
+| revision | `task` | `run_id` plus `revision` |
 | cancel | `cancel` | `run_id` plus optional `assignment_ids` |
 | cleanup | `cancel` | `run_id` plus `cleanup: true` |
 
 `wait_until` remains `progress` and `terminal` for 3.2.1. The additive
 run mode is `decision_or_attention`. Routine progress never wakes.
 
+`task.revision` derives a new bounded correction from a completed, clean,
+exactly identified producer assignment. It preserves provider, model, write
+scope, access, capabilities, and the original assignment constraints for a
+fresh worker, plus correction feedback and the reviewed HEAD. If the combined
+prompt cannot fit the existing 16,384-byte bound, `bounded_context_overflow`
+rejects it before dispatch; constraints are never silently clipped. Public
+admission receipts and the compact coordination packet return the producer
+request identity (`request_idempotency_key`) and unambiguous per-assignment
+HEAD/status. Completed candidates next-action to `review`; `revision` is an
+available capability for a proven clean completed writer. The coordinator
+decides whether findings warrant using it; provider prose does not make that decision. Completed-but-dirty,
+uncertain, or cleanup-incomplete evidence stays unresolved. Active,
+uncertain, dirty, stale, missing, remote, or unfinal producers fail closed
+and are never replayed. Duplicate calls with the same identity, including
+concurrent duplicates, dispatch once. Compact packets include retrievable
+artifact refs when those artifacts exist; identity hashes are not presented
+as retrievable artifacts.
+
+The correction chain has a fixed limit of three admitted rounds and one
+distinct child per producer. The child retains original and immediate producer
+identity, `round`, and `limit`. Repeated identical requests follow that child;
+different feedback is rejected with `revision_child_exists` and the child id,
+explicitly stating that the new feedback was not applied. An admitted
+failure does not replenish a consumed round. `revision_budget_exhausted` requires
+a deliberate new bounded assignment and never dispatches it automatically.
+The production store reserves that child exclusively across MCP processes.
+If a crash leaves a reservation without a child receipt, the operation returns
+`revision_admission_pending`. Inspect the retained state; no automatic replay or
+budget replenishment follows. A deliberate new bounded assignment is a separate
+decision and is not a recovery claim that earlier work never ran.
+
+Normal run replies also contain `result_evidence`; `view: "diagnostics"` requests
+its detailed outcome and usage view. It uses the existing ledger and local
+decision card. Completion is not Codex acceptance; unknown usage stays unknown.
+See [run results](run-results.md) for measurement scope and limits.
+
 Mixing a run body with 3.2.1 `task_id` / `workspace_mode` / `create_pr` /
 `reply` fields fails closed.
 
@@ -71,6 +111,36 @@ and `verify` derive `read_only`. An explicit value must agree with the role.
 Omitting access and supplying its equivalent explicit value produce the same
 normalized request. Multiple writer lanes need explicit disjoint write scopes.
 
+Optional `preferences` reuse provider ownership by role so eligible
+assignments may omit `provider` / `model`. Exact assignment selections win,
+including when they override an unknown role preference. Unknown or
+unavailable preferred providers are reported only when an assignment would
+use them; unused unknown role preferences do not block dispatch. Used
+unknown preferences return a pre-admission result with no persisted run and
+`next_action=resubmit` instead of a fake identity that asks for `reply`.
+Omitted preferences keep the explicit provider path unchanged.
+
+```json
+{
+  "run_request": {
+    "run_id": "vale-hardening",
+    "repo": "/absolute/repository/path",
+    "objective": "Implement and review the hardening plan.",
+    "preferences": {
+      "implement": { "provider": "grok" },
+      "review": { "provider": "cursor-local" }
+    },
+    "assignments": [
+      {
+        "assignment_id": "social-implementation",
+        "role": "implement",
+        "prompt": "Implement the social ingestion slice."
+      }
+    ]
+  }
+}
+```
+
 The server observes the clean exact Git identity, resolves the provider model,
 and derives the request idempotency key, manifest/prompt-envelope/lane
 digests, child and task identities, and managed-workspace policy. Callers
diff --git a/plugins/codex-co-engineer/mcp/v3/acp-worker.mjs b/plugins/codex-co-engineer/mcp/v3/acp-worker.mjs
index fbdef63..4e9fe59 100644
--- a/plugins/codex-co-engineer/mcp/v3/acp-worker.mjs
+++ b/plugins/codex-co-engineer/mcp/v3/acp-worker.mjs
@@ -1682,15 +1682,21 @@ export async function runAcpTask({ root, taskId, signal } = {}) {
   const cwd = requireAbsoluteDirectory(task.cwd);
   const prompt = await readPrompt(root, taskId);
   const configuration = providerConfiguration(task);
-  const timeoutMs = taskTimeoutMs(task);
-  if (!Number.isSafeInteger(timeoutMs) || timeoutMs < 1) fail('invalid_timeout', 'timeout_ms must be at least 1000.');
+  // Session startup / reconnect keep a bounded timeout. The turn itself is
+  // owned by startDeadlineWatch + AbortSignal so audited extensions re-arm.
+  const startupTimeoutMs = taskTimeoutMs(task);
+  if (!Number.isSafeInteger(startupTimeoutMs) || startupTimeoutMs < 1) {
+    fail('invalid_timeout', 'timeout_ms must be at least 1000.');
+  }
 
   if (task.provider === 'dsh') {
-    return runDshExec({ root, task, prompt, cwd, configuration, timeoutMs, signal });
+    return runDshExec({ root, task, prompt, cwd, configuration, timeoutMs: startupTimeoutMs, signal });
   }
 
   const childEnv = providerChildEnvironment(task);
-  const runtime = await makeRuntime({ root, cwd, configuration, timeoutMs, taskId, signal, env: childEnv });
+  const runtime = await makeRuntime({
+    root, cwd, configuration, timeoutMs: startupTimeoutMs, taskId, signal, env: childEnv,
+  });
   const controller = new AbortController();
   let timedOut = false;
   const abort = () => controller.abort(signal?.reason ?? new AcpWorkerError(timedOut ? 'timeout' : 'cancelled', timedOut ? 'ACP task exceeded its recorded deadline.' : 'Task cancelled.'));
@@ -1739,7 +1745,9 @@ export async function runAcpTask({ root, taskId, signal } = {}) {
       text: prompt,
       mode: 'prompt',
       requestId,
-      timeoutMs,
+      // Disable the fixed inner turn timer; the worker deadline AbortSignal is
+      // the sole extensible execution bound for this prompt.
+      timeoutMs: 0,
       signal: controller.signal,
     });
     // From this point onward the provider may have accepted the prompt. A
@@ -1773,6 +1781,12 @@ export async function runAcpTask({ root, taskId, signal } = {}) {
     }
 
     const result = await turn.result;
+    // Authoritative deadline / cancel outcomes beat any runtime settlement,
+    // including partial text that upstream historically treated as end_turn.
+    if (timedOut) fail('timeout', 'ACP task exceeded its recorded deadline.');
+    if (result.status === 'cancelled' || controller.signal.aborted) {
+      fail('cancelled', 'ACP task was cancelled.');
+    }
     const current = (await readTask(root, taskId)).task;
     const unsupportedQuestion = isStructuredAskUserQuestionUnsupported(lastEvent)
       || observedUnsupportedQuestion;
diff --git a/plugins/codex-co-engineer/mcp/v3/admission-usage.mjs b/plugins/codex-co-engineer/mcp/v3/admission-usage.mjs
new file mode 100644
index 0000000..6ad1bc0
--- /dev/null
+++ b/plugins/codex-co-engineer/mcp/v3/admission-usage.mjs
@@ -0,0 +1,58 @@
+// Project the current durable admission facts through UsageLedgerV1.
+// This is a snapshot of one run, not a history of its correction ancestors.
+// It performs no I/O, token estimation, quota lookup, or provider-prose parsing.
+import { IDENTITY_LABELS } from './identity.mjs';
+import { correlateTelemetryFieldV1 } from './protected-telemetry.mjs';
+import {
+  appendUsageReceiptV1, correlateUsageAssignmentV1, correlateUsageModelV1,
+  hostMeasuredMetricV1, MAX_USAGE_COUNTER, MAX_USAGE_DURATION_MS,
+  openUsageLedgerV1, unknownHostUsageV1, unknownProviderUsageV1,
+} from './usage-ledger.mjs';
+
+function measured(value, maximum) {
+  return Number.isSafeInteger(value) && value >= 0 && value <= maximum
+    ? hostMeasuredMetricV1(value) : null;
+}
+
+export function projectAdmissionUsageLedgerV1(record) {
+  let ledger = openUsageLedgerV1({ budgets: [] });
+  const lanes = record.lanes;
+  const runDigest = correlateTelemetryFieldV1(IDENTITY_LABELS.RUN_IDENTITY, 'run_id', record.run_id);
+  for (let index = 0; index < lanes.length; index += 1) {
+    const lane = lanes[index];
+    const host = unknownHostUsageV1();
+    // Run-wide counters contribute once to the ledger total. They are not
+    // individual provider timing. Other rows carry zero contributions.
+    host.submissions = hostMeasuredMetricV1(index === 0 ? 1 : 0);
+    const attention = measured(record.telemetry?.attention_count, MAX_USAGE_COUNTER);
+    if (attention) host.attention_rounds = index === 0 ? attention : hostMeasuredMetricV1(0);
+    const elapsed = measured(record.telemetry?.time_to_terminal_handoff_ms, MAX_USAGE_DURATION_MS);
+    if (elapsed) host.elapsed_ms = index === 0 ? elapsed : hostMeasuredMetricV1(0);
+    if (lane.prompt_dispatched === true && lane.dispatch_confidence === 'authoritative') {
+      host.provider_invocations = hostMeasuredMetricV1(1);
+    } else if (lane.prompt_attempted === false) {
+      host.provider_invocations = hostMeasuredMetricV1(0);
+    }
+    // Attempted but unacknowledged dispatch remains unknown, including failure.
+    // Normal task receipts do not supply trustworthy provider-token counters.
+    const model = correlateUsageModelV1(lane.provider, lane.model);
+    ledger = appendUsageReceiptV1(ledger, {
+      seq: 1,
+      recorded_at: record.updated_at,
+      identity: {
+        run_id_digest: runDigest,
+        assignment_id_digest: correlateUsageAssignmentV1(lane.assignment_id),
+        attempt: lane.dispatch_identity?.attempt ?? 1,
+        generation: 1,
+        provider: lane.provider,
+        requested_model_digest: model,
+        effective_model_digest: model,
+        requested_effort: null,
+        effective_effort: null,
+      },
+      provider_usage: unknownProviderUsageV1(),
+      host_usage: host,
+    });
+  }
+  return ledger;
+}
diff --git a/plugins/codex-co-engineer/mcp/v3/contract.mjs b/plugins/codex-co-engineer/mcp/v3/contract.mjs
index 7593284..e0eaa59 100644
--- a/plugins/codex-co-engineer/mcp/v3/contract.mjs
+++ b/plugins/codex-co-engineer/mcp/v3/contract.mjs
@@ -1,4 +1,4 @@
-export const VERSION = '3.4.2';
+export const VERSION = '3.4.3';
 export const DURATION_MARGIN = 1.20;
 export const MIN_DURATION_MS = 1_000;
 export const MAX_EXPECTED_DURATION_MS = 86_400_000;
@@ -108,6 +108,9 @@ export function providerCapabilities(provider) {
   });
 }
 
+export const MAX_REVISION_FEEDBACK_BYTES = 4_096;
+export const MIN_REVISION_FEEDBACK_BYTES = 1;
+
 export function mcpPendingCallReport() {
   return Object.freeze({
     advertised_budget_ms: MCP_PENDING_CALL_BUDGET_MS,
diff --git a/plugins/codex-co-engineer/mcp/v3/delegation-preferences.mjs b/plugins/codex-co-engineer/mcp/v3/delegation-preferences.mjs
new file mode 100644
index 0000000..2ff0319
--- /dev/null
+++ b/plugins/codex-co-engineer/mcp/v3/delegation-preferences.mjs
@@ -0,0 +1,212 @@
+// DelegationPreferencesV1 — explicit reusable provider ownership for simple
+// run_request assignments. Preferences fill omitted provider/model fields by
+// role. Exact assignment selections win. Unknown providers never substitute.
+
+import {
+  capturedFreeze,
+  capturedHasOwn,
+  capturedIncludes,
+  capturedOwnKeys,
+  isKnownProvider,
+  isKnownRole,
+  isModelId,
+  knownProvidersJoined,
+} from './grammar.mjs';
+import { RunContractV1Error } from './run-manifest.mjs';
+import {
+  assertDirectJsonClosure,
+  assertNotProxy,
+  assertPlainObject,
+  freezeData,
+  ownDataValue,
+} from './selection-json.mjs';
+
+export const DELEGATION_PREFERENCES_SCHEMA_ID = 'codex-co-engineer.delegation-preferences.v1';
+export const DELEGATION_PREFERENCES_VERSION = 1;
+export const DELEGATION_PREFERENCE_ROLES = capturedFreeze(['implement', 'review', 'verify']);
+export const DELEGATION_PREFERENCE_ENTRY_KEYS = capturedFreeze(['provider', 'model']);
+
+function preferenceError(code, field, message) {
+  throw new RunContractV1Error(code, field, message);
+}
+
+function emptyPreferences() {
+  return freezeData({
+    schema: DELEGATION_PREFERENCES_SCHEMA_ID,
+    version: DELEGATION_PREFERENCES_VERSION,
+    by_role: {},
+    attention: null,
+  });
+}
+
+function parseEntry(value, field) {
+  assertNotProxy(value, field);
+  assertPlainObject(value, 'invalid_type', field, 'preference');
+  assertDirectJsonClosure(value, field);
+  for (const key of capturedOwnKeys(value)) {
+    if (typeof key !== 'string') preferenceError('symbol_key_denied', field);
+    if (!capturedIncludes(DELEGATION_PREFERENCE_ENTRY_KEYS, key)) {
+      preferenceError('unknown_key', `${field}.${key}`, 'Preference entries accept only provider and optional model.');
+    }
+  }
+  if (!capturedHasOwn(value, 'provider')) {
+    preferenceError('missing_key', `${field}.provider`, 'A reusable preference must name an exact provider.');
+  }
+  const provider = ownDataValue(value, 'provider', `${field}.provider`);
+  if (typeof provider !== 'string') {
+    preferenceError('invalid_type', `${field}.provider`, 'provider must be a string.');
+  }
+  const known = isKnownProvider(provider);
+  let model;
+  if (capturedHasOwn(value, 'model')) {
+    model = ownDataValue(value, 'model', `${field}.model`);
+    if (typeof model !== 'string' || !isModelId(model)) {
+      preferenceError('invalid_model', `${field}.model`, 'The preferred model is not in the provider model grammar.');
+    }
+  }
+  return freezeData({
+    provider,
+    ...(model !== undefined ? { model } : {}),
+    known,
+  });
+}
+
+/**
+ * Parse optional run_request.preferences. Omitted preferences preserve the
+ * legacy explicit-provider path. Invalid shapes fail closed.
+ */
+export function parseDelegationPreferencesV1(value, field = 'run_request.preferences') {
+  if (value === undefined) return emptyPreferences();
+  assertNotProxy(value, field);
+  assertPlainObject(value, 'invalid_type', field, 'preferences');
+  assertDirectJsonClosure(value, field);
+  const byRole = {};
+  for (const key of capturedOwnKeys(value)) {
+    if (typeof key !== 'string') preferenceError('symbol_key_denied', field);
+    if (!capturedIncludes(DELEGATION_PREFERENCE_ROLES, key) || !isKnownRole(key)) {
+      preferenceError('unknown_key', `${field}.${key}`, 'Preferences are keyed by implement, review, or verify.');
+    }
+    byRole[key] = parseEntry(ownDataValue(value, key, `${field}.${key}`), `${field}.${key}`);
+  }
+  return freezeData({
+    schema: DELEGATION_PREFERENCES_SCHEMA_ID,
+    version: DELEGATION_PREFERENCES_VERSION,
+    by_role: freezeData(byRole),
+    attention: null,
+  });
+}
+
+/**
+ * Resolve one assignment's provider/model. Explicit assignment fields win.
+ * Unknown preferred providers never become a different slot. Model may be
+ * omitted; the run-request compiler applies the closed provider default.
+ */
+export function resolveAssignmentPreferenceV1(assignment, preferences, field) {
+  const role = assignment?.role;
+  const requestedProvider = assignment?.provider;
+  const requestedModel = assignment?.model;
+  const preference = role && preferences?.by_role && capturedHasOwn(preferences.by_role, role)
+    ? preferences.by_role[role]
+    : undefined;
+
+  if (requestedProvider !== undefined) {
+    if (typeof requestedProvider !== 'string' || !isKnownProvider(requestedProvider)) {
+      preferenceError('unknown_provider', `${field}.provider`, `provider must be one of ${knownProvidersJoined()}.`);
+    }
+    const model = requestedModel !== undefined
+      ? requestedModel
+      : (preference && preference.known === true && preference.provider === requestedProvider
+        ? preference.model
+        : undefined);
+    return freezeData({
+      provider: requestedProvider,
+      ...(model !== undefined ? { model } : {}),
+      source: 'explicit',
+    });
+  }
+
+  if (preference === undefined) {
+    preferenceError('missing_key', `${field}.provider`, 'provider is required unless a reusable role preference fills it.');
+  }
+  if (preference.known !== true) {
+    preferenceError(
+      'preferred_provider_unavailable',
+      `${field}.provider`,
+      'The preferred provider is unknown or unavailable; supply an explicit four-slot provider instead of substituting.',
+    );
+  }
+  const model = requestedModel !== undefined ? requestedModel : preference.model;
+  return freezeData({
+    provider: preference.provider,
+    ...(model !== undefined ? { model } : {}),
+    source: 'preference',
+  });
+}
+
+/**
+ * Inspect a simple run_request for reusable preferences without compiling Git
+ * identity. Used by the adapter to surface honest attention before dispatch.
+ */
+export function inspectDelegationPreferencesV1(request, field = 'run_request') {
+  assertNotProxy(request, field);
+  assertPlainObject(request, 'invalid_type', field, 'run_request');
+  const raw = capturedHasOwn(request, 'preferences')
+    ? ownDataValue(request, 'preferences', `${field}.preferences`)
+    : undefined;
+  const preferences = parseDelegationPreferencesV1(raw, `${field}.preferences`);
+  const assignments = capturedHasOwn(request, 'assignments')
+    ? ownDataValue(request, 'assignments', `${field}.assignments`)
+    : undefined;
+  const resolved = [];
+  const usedUnknown = [];
+  if (Array.isArray(assignments)) {
+    for (let index = 0; index < assignments.length; index += 1) {
+      const assignmentField = `${field}.assignments[${index}]`;
+      const assignment = assignments[index];
+      if (!assignment || typeof assignment !== 'object') continue;
+      const role = capturedHasOwn(assignment, 'role')
+        ? ownDataValue(assignment, 'role', `${assignmentField}.role`)
+        : undefined;
+      const provider = capturedHasOwn(assignment, 'provider')
+        ? ownDataValue(assignment, 'provider', `${assignmentField}.provider`)
+        : undefined;
+      const model = capturedHasOwn(assignment, 'model')
+        ? ownDataValue(assignment, 'model', `${assignmentField}.model`)
+        : undefined;
+      const preference = role && preferences.by_role && capturedHasOwn(preferences.by_role, role)
+        ? preferences.by_role[role]
+        : undefined;
+      if (provider === undefined && preference && preference.known !== true) {
+        usedUnknown.push(freezeData({
+          role,
+          provider: preference.provider,
+          code: 'preferred_provider_unavailable',
+        }));
+        continue;
+      }
+      resolved.push(resolveAssignmentPreferenceV1(
+        { role, provider, model },
+        preferences,
+        assignmentField,
+      ));
+    }
+  }
+  const attention = usedUnknown.length === 0 ? null : freezeData({
+    status: 'blocked',
+    code: 'preferred_provider_unavailable',
+    next_action: 'supply_explicit_provider',
+    items: usedUnknown,
+  });
+  return freezeData({
+    preferences: freezeData({
+      ...preferences,
+      attention,
+    }),
+    attention,
+    resolved,
+  });
+}
+
+capturedFreeze(parseDelegationPreferencesV1);
+capturedFreeze(resolveAssignmentPreferenceV1);
+capturedFreeze(inspectDelegationPreferencesV1);
diff --git a/plugins/codex-co-engineer/mcp/v3/final-decision-card.mjs b/plugins/codex-co-engineer/mcp/v3/final-decision-card.mjs
index 04d98c7..63da209 100644
--- a/plugins/codex-co-engineer/mcp/v3/final-decision-card.mjs
+++ b/plugins/codex-co-engineer/mcp/v3/final-decision-card.mjs
@@ -248,6 +248,58 @@ export const SUMMARY_KEYS = capturedFreeze([
   'blocker_count', 'branch', 'ci', 'head', 'pr', 'push', 'ready_for_sol_merge',
   'text', 'tree', 'worktree',
 ]);
+export const LOCAL_OUTCOME_SCHEMA_ID = 'codex-co-engineer.local-outcome.v1';
+export const LOCAL_OUTCOME_RESULT_SCHEMA_ID = 'codex-co-engineer.local-outcome-result.v1';
+export const LOCAL_OUTCOME_VERSION = 1;
+export const PUBLIC_LABEL_REVIEW_NEEDED = 'Review needed';
+export const PUBLIC_LABEL_UNRESOLVED = 'Unresolved';
+export const PUBLIC_LABEL_FAILED = 'Failed';
+export const PUBLIC_LABEL_IN_PROGRESS = 'In progress';
+export const PUBLIC_LABEL_ACCEPTED = 'Accepted';
+export const LOCAL_PUBLIC_LABELS = capturedFreeze([
+  PUBLIC_LABEL_REVIEW_NEEDED, PUBLIC_LABEL_UNRESOLVED, PUBLIC_LABEL_FAILED,
+  PUBLIC_LABEL_IN_PROGRESS, PUBLIC_LABEL_ACCEPTED,
+]);
+export const ASSIGNMENT_OUTCOMES = capturedFreeze([
+  'cancelled', 'completed', 'failed', 'uncertain', 'unfinal',
+]);
+export const NEXT_DECISIONS = capturedFreeze([
+  'inspect_unresolved', 'none', 'resolve_failures', 'review_candidate', 'wait_for_completion',
+]);
+export const LOCAL_CHECK_STATUSES = capturedFreeze([
+  'failed', 'missing', 'passed', 'provider_pass', 'unknown',
+]);
+export const LOCAL_OUTCOME_INPUT_KEYS = capturedFreeze([
+  'artifacts', 'assignments', 'candidate', 'checks', 'codex_acceptance', 'identity',
+  'schema', 'version',
+]);
+export const LOCAL_OUTCOME_REQUIRED_KEYS = capturedFreeze([
+  'assignments', 'candidate', 'identity', 'schema', 'version',
+]);
+export const LOCAL_CANDIDATE_KEYS = capturedFreeze(['branch', 'composed', 'head', 'tree']);
+export const LOCAL_ASSIGNMENT_KEYS = capturedFreeze([
+  'assignment_id', 'head', 'outcome', 'provider', 'required', 'role',
+]);
+export const LOCAL_ASSIGNMENT_REQUIRED_KEYS = capturedFreeze([
+  'assignment_id', 'outcome', 'provider', 'required', 'role',
+]);
+export const LOCAL_CHECK_KEYS = capturedFreeze(['id', 'present', 'status']);
+export const LOCAL_ACCEPTANCE_KEYS = capturedFreeze([
+  'accepted', 'authority', 'head', 'run_id', 'tree',
+]);
+export const LOCAL_ACCEPTANCE_REQUIRED_KEYS = capturedFreeze(['accepted', 'authority']);
+export const LOCAL_OUTCOME_RESULT_KEYS = capturedFreeze([
+  'artifacts', 'assignment_result', 'assignments', 'candidate', 'checks',
+  'codex_accepted', 'label', 'next_decision', 'review_needed', 'schema',
+  'summary', 'truncation', 'unresolved', 'version',
+]);
+export const LOCAL_SUMMARY_KEYS = capturedFreeze([
+  'assignment_result', 'codex_accepted', 'head', 'next_decision', 'review_needed',
+  'text', 'tree', 'unresolved',
+]);
+export const CODEX_ACCEPTANCE_AUTHORITY = 'codex';
+export const MAX_LOCAL_CHECKS = 8;
+export const MAX_CHECK_ID_BYTES = 64;
 
 export const FINAL_DECISION_CARD_ERROR_CODES = capturedFreeze([
   'accessor_property_denied', 'aliased_reference_denied', 'bounds_exceeded',
@@ -949,8 +1001,15 @@ export function describeFinalDecisionCardV1() {
     version: FINAL_DECISION_CARD_VERSION,
     result_schema: FINAL_DECISION_CARD_RESULT_SCHEMA_ID,
     rule: 'typed_facts_only_never_provider_prose',
-    api: capturedFreeze(['describeFinalDecisionCardV1', 'projectFinalDecisionCardV1']),
+    api: capturedFreeze([
+      'describeFinalDecisionCardV1',
+      'projectFinalDecisionCardV1',
+      'projectLocalOutcomeCardV1',
+    ]),
     public_labels: PUBLIC_LABELS,
+    local_outcome_schema: LOCAL_OUTCOME_SCHEMA_ID,
+    local_outcome_result_schema: LOCAL_OUTCOME_RESULT_SCHEMA_ID,
+    local_public_labels: LOCAL_PUBLIC_LABELS,
     blocker_codes: BLOCKER_CODES,
     checks: CARD_CHECKS,
     error_codes: FINAL_DECISION_CARD_ERROR_CODES,
@@ -1050,5 +1109,294 @@ export function projectFinalDecisionCardV1(input) {
   return freezeData(card);
 }
 
+function optionalSha40(object, key, pathLabel) {
+  const value = ownDataValue(object, key, pathLabel);
+  if (value === null) return null;
+  if (typeof value !== 'string') deny('invalid_type', pathLabel);
+  if (!isSha40(value)) deny('invalid_format', pathLabel);
+  return value;
+}
+
+function optionalBranch(object, key, pathLabel) {
+  const value = ownDataValue(object, key, pathLabel);
+  if (value === null) return null;
+  return ownBranch(object, key, pathLabel);
+}
+
+function parseLocalCandidate(input, pathLabel) {
+  const object = assertClosedObject(input, LOCAL_CANDIDATE_KEYS, pathLabel);
+  requireKeys(object, LOCAL_CANDIDATE_KEYS, pathLabel);
+  return freezeRecord(LOCAL_CANDIDATE_KEYS, {
+    branch: optionalBranch(object, 'branch', `${pathLabel}.branch`),
+    head: optionalSha40(object, 'head', `${pathLabel}.head`),
+    tree: optionalSha40(object, 'tree', `${pathLabel}.tree`),
+    composed: ownBoolean(object, 'composed', `${pathLabel}.composed`),
+  });
+}
+
+function parseLocalAssignment(input, pathLabel) {
+  const object = assertClosedObject(input, LOCAL_ASSIGNMENT_KEYS, pathLabel);
+  requireKeys(object, LOCAL_ASSIGNMENT_REQUIRED_KEYS, pathLabel);
+  const assignmentId = ownString(object, 'assignment_id', `${pathLabel}.assignment_id`);
+  if (!isAssignmentId(assignmentId)) deny('invalid_format', `${pathLabel}.assignment_id`);
+  const provider = ownString(object, 'provider', `${pathLabel}.provider`);
+  if (!isKnownProvider(provider)) deny('invalid_format', `${pathLabel}.provider`);
+  const role = ownString(object, 'role', `${pathLabel}.role`);
+  if (!isKnownRole(role)) deny('invalid_format', `${pathLabel}.role`);
+  const head = hasOwn(object, 'head')
+    ? optionalSha40(object, 'head', `${pathLabel}.head`)
+    : null;
+  return freezeRecord(LOCAL_ASSIGNMENT_KEYS, {
+    assignment_id: assignmentId,
+    provider,
+    role,
+    required: ownBoolean(object, 'required', `${pathLabel}.required`),
+    outcome: ownEnum(object, 'outcome', ASSIGNMENT_OUTCOMES, `${pathLabel}.outcome`),
+    head,
+  });
+}
+
+function parseLocalAssignments(input, pathLabel) {
+  try { assertNotProxy(input, pathLabel); } catch (error) { remapClosure(error, pathLabel); }
+  try { assertDenseJsonArray(input, pathLabel); } catch (error) { remapClosure(error, pathLabel); }
+  if (input.length < MIN_ASSIGNMENTS || input.length > MAX_ASSIGNMENTS) {
+    deny('bounds_exceeded', pathLabel);
+  }
+  const assignments = [];
+  const seen = new SET_CTOR();
+  for (let i = 0; i < input.length; i += 1) {
+    const assignment = parseLocalAssignment(input[i], `${pathLabel}[${i}]`);
+    if (seen.has(assignment.assignment_id)) deny('invalid_format', `${pathLabel}[${i}].assignment_id`);
+    seen.add(assignment.assignment_id);
+    assignments.push(assignment);
+  }
+  assignments.sort((left, right) => {
+    if (left.assignment_id === right.assignment_id) return 0;
+    return left.assignment_id < right.assignment_id ? -1 : 1;
+  });
+  return freezeList(assignments);
+}
+
+function parseLocalCheck(input, pathLabel) {
+  const object = assertClosedObject(input, LOCAL_CHECK_KEYS, pathLabel);
+  requireKeys(object, LOCAL_CHECK_KEYS, pathLabel);
+  return freezeRecord(LOCAL_CHECK_KEYS, {
+    id: ownString(object, 'id', `${pathLabel}.id`, MAX_CHECK_ID_BYTES),
+    present: ownBoolean(object, 'present', `${pathLabel}.present`),
+    status: ownEnum(object, 'status', LOCAL_CHECK_STATUSES, `${pathLabel}.status`),
+  });
+}
+
+function parseLocalChecks(input, pathLabel) {
+  if (input === undefined) return freezeList([]);
+  try { assertNotProxy(input, pathLabel); } catch (error) { remapClosure(error, pathLabel); }
+  try { assertDenseJsonArray(input, pathLabel); } catch (error) { remapClosure(error, pathLabel); }
+  if (input.length > MAX_LOCAL_CHECKS) deny('bounds_exceeded', pathLabel);
+  const checks = [];
+  const seen = new SET_CTOR();
+  for (let i = 0; i < input.length; i += 1) {
+    const check = parseLocalCheck(input[i], `${pathLabel}[${i}]`);
+    if (seen.has(check.id)) deny('invalid_format', `${pathLabel}[${i}].id`);
+    seen.add(check.id);
+    checks.push(check);
+  }
+  return freezeList(checks);
+}
+
+function parseCodexAcceptance(input, pathLabel) {
+  if (input === undefined) {
+    return freezeRecord(LOCAL_ACCEPTANCE_KEYS, {
+      accepted: false, authority: null, run_id: null, head: null, tree: null,
+    });
+  }
+  const object = assertClosedObject(input, LOCAL_ACCEPTANCE_KEYS, pathLabel);
+  requireKeys(object, LOCAL_ACCEPTANCE_REQUIRED_KEYS, pathLabel);
+  const accepted = ownBoolean(object, 'accepted', `${pathLabel}.accepted`);
+  const authority = ownDataValue(object, 'authority', `${pathLabel}.authority`);
+  if (authority !== null && typeof authority !== 'string') deny('invalid_type', `${pathLabel}.authority`);
+  if (authority !== null && authority !== CODEX_ACCEPTANCE_AUTHORITY) {
+    deny('invalid_format', `${pathLabel}.authority`);
+  }
+  const runId = hasOwn(object, 'run_id')
+    ? ownDataValue(object, 'run_id', `${pathLabel}.run_id`)
+    : null;
+  if (runId !== null && typeof runId !== 'string') deny('invalid_type', `${pathLabel}.run_id`);
+  if (typeof runId === 'string') bindRunId(runId, `${pathLabel}.run_id`);
+  const head = hasOwn(object, 'head')
+    ? optionalSha40(object, 'head', `${pathLabel}.head`)
+    : null;
+  const tree = hasOwn(object, 'tree')
+    ? optionalSha40(object, 'tree', `${pathLabel}.tree`)
+    : null;
+  return freezeRecord(LOCAL_ACCEPTANCE_KEYS, {
+    accepted: accepted === true,
+    authority: authority === CODEX_ACCEPTANCE_AUTHORITY ? CODEX_ACCEPTANCE_AUTHORITY : null,
+    run_id: typeof runId === 'string' ? runId : null,
+    head,
+    tree,
+  });
+}
+
+function hasKnownFailedCheck(checks) {
+  for (let i = 0; i < checks.length; i += 1) {
+    if (checks[i].status === 'failed') return true;
+  }
+  return false;
+}
+
+function honorCodexAcceptance(acceptance, identity, candidate, assignmentResult, checks) {
+  if (acceptance.accepted !== true) return false;
+  if (acceptance.authority !== CODEX_ACCEPTANCE_AUTHORITY) return false;
+  if (assignmentResult !== 'completed') return false;
+  if (acceptance.run_id == null || acceptance.head == null) return false;
+  if (acceptance.run_id !== identity.run_id) return false;
+  if (candidate.head == null || acceptance.head !== candidate.head) return false;
+  if (acceptance.tree != null && acceptance.tree !== candidate.tree) return false;
+  if (hasKnownFailedCheck(checks)) return false;
+  return true;
+}
+
+export function rollupAssignmentResult(assignments, runOutcome) {
+  let hasActive = false;
+  let hasFailed = false;
+  let hasCancelled = false;
+  let hasUncertain = false;
+  let completedRequired = 0;
+  let requiredCount = 0;
+  for (let i = 0; i < assignments.length; i += 1) {
+    const assignment = assignments[i];
+    if (assignment.required === true) requiredCount += 1;
+    if (assignment.outcome === 'unfinal') hasActive = true;
+    else if (assignment.outcome === 'failed') hasFailed = true;
+    else if (assignment.outcome === 'cancelled') hasCancelled = true;
+    else if (assignment.outcome === 'uncertain') hasUncertain = true;
+    else if (assignment.outcome === 'completed' && assignment.required === true) {
+      completedRequired += 1;
+    }
+  }
+  if (runOutcome === 'failed' || hasFailed) return 'failed';
+  if (runOutcome === 'cancelled' || hasCancelled) return 'cancelled';
+  if (hasActive || runOutcome === 'unfinal') return 'unfinal';
+  if (runOutcome === 'uncertain' || hasUncertain) return 'uncertain';
+  if ((runOutcome == null || runOutcome === 'completed')
+    && requiredCount > 0 && completedRequired === requiredCount) {
+    return 'completed';
+  }
+  return 'uncertain';
+}
+
+function deriveNextDecision(result, reviewNeeded, unresolved) {
+  if (result === 'unfinal') return 'wait_for_completion';
+  if (result === 'failed' || result === 'cancelled') return 'resolve_failures';
+  if (result === 'uncertain' || unresolved === true) return 'inspect_unresolved';
+  if (reviewNeeded === true) return 'review_candidate';
+  return 'none';
+}
+
+function localLabel(result, reviewNeeded, unresolved, accepted) {
+  if (accepted === true && result === 'completed') return PUBLIC_LABEL_ACCEPTED;
+  if (result === 'failed' || result === 'cancelled') return PUBLIC_LABEL_FAILED;
+  if (result === 'unfinal') return PUBLIC_LABEL_IN_PROGRESS;
+  if (unresolved === true || result === 'uncertain') return PUBLIC_LABEL_UNRESOLVED;
+  if (reviewNeeded === true) return PUBLIC_LABEL_REVIEW_NEEDED;
+  return PUBLIC_LABEL_REVIEW_NEEDED;
+}
+
+function localSummaryText(result, accepted, reviewNeeded, unresolved) {
+  if (accepted === true && result === 'completed') {
+    return 'Codex accepted this completed candidate.';
+  }
+  if (result === 'failed') return 'The run failed; resolve the failures.';
+  if (result === 'cancelled') return 'The run was cancelled; resolve the failures.';
+  if (result === 'unfinal') return 'Work is still in progress; wait for completion.';
+  if (result === 'uncertain' || unresolved === true) {
+    return 'The outcome is unresolved; inspect before deciding.';
+  }
+  if (reviewNeeded === true) return 'Completed work needs review; it is not Codex-accepted.';
+  return 'Completed work is not Codex-accepted.';
+}
+
+function projectLocalSummary(candidate, result, accepted, reviewNeeded, unresolved, nextDecision) {
+  const text = clipSummaryText(localSummaryText(result, accepted, reviewNeeded, unresolved));
+  return freezeRecord(LOCAL_SUMMARY_KEYS, {
+    assignment_result: result,
+    codex_accepted: accepted,
+    review_needed: reviewNeeded,
+    unresolved,
+    next_decision: nextDecision,
+    head: candidate.head,
+    tree: candidate.tree,
+    text,
+  });
+}
+
+export function projectLocalOutcomeCardV1(input) {
+  if (IS_PROXY(input)) deny('proxy_denied', 'request');
+  const object = assertClosedObject(input, LOCAL_OUTCOME_INPUT_KEYS, 'request');
+  requireKeys(object, LOCAL_OUTCOME_REQUIRED_KEYS, 'request');
+  const schema = ownString(object, 'schema', 'request.schema', MAX_CARD_STRING_BYTES);
+  if (schema !== LOCAL_OUTCOME_SCHEMA_ID) deny('invalid_format', 'request.schema');
+  const version = ownDataValue(object, 'version', 'request.version');
+  if (version !== LOCAL_OUTCOME_VERSION) deny('invalid_format', 'request.version');
+  const identity = parseIdentity(ownDataValue(object, 'identity', 'identity'), 'identity');
+  const candidate = parseLocalCandidate(ownDataValue(object, 'candidate', 'candidate'), 'candidate');
+  const assignments = parseLocalAssignments(
+    ownDataValue(object, 'assignments', 'assignments'),
+    'assignments',
+  );
+  const assignmentIds = new SET_CTOR();
+  for (let i = 0; i < assignments.length; i += 1) assignmentIds.add(assignments[i].assignment_id);
+  const checks = parseLocalChecks(
+    optionalOwn(object, 'checks', 'checks', (src, key, label) => ownDataValue(src, key, label)),
+    'checks',
+  );
+  const artifacts = parseArtifacts(
+    optionalOwn(object, 'artifacts', 'artifacts', (src, key, label) => ownDataValue(src, key, label)),
+    identity,
+    assignmentIds,
+    'artifacts',
+  );
+  const acceptance = parseCodexAcceptance(
+    optionalOwn(object, 'codex_acceptance', 'codex_acceptance', (src, key, label) => ownDataValue(src, key, label)),
+    'codex_acceptance',
+  );
+  const assignmentResult = rollupAssignmentResult(assignments);
+  const unresolved = assignmentResult === 'uncertain' || assignmentResult === 'unfinal';
+  const codexAccepted = honorCodexAcceptance(
+    acceptance, identity, candidate, assignmentResult, checks,
+  );
+  const reviewNeeded = codexAccepted !== true && assignmentResult === 'completed';
+  const nextDecision = deriveNextDecision(assignmentResult, reviewNeeded, unresolved);
+  const truncation = freezeRecord(TRUNCATION_KEYS, {
+    truncated: artifacts.truncated,
+    fields: freezeList(artifacts.truncated ? ['artifacts'] : []),
+    original_count: artifacts.original_count,
+    retained: artifacts.artifacts.length,
+    omitted: artifacts.omitted,
+    reason: artifacts.truncated ? ARTIFACT_TRUNCATION_REASON : null,
+  });
+  const card = freezeRecord(LOCAL_OUTCOME_RESULT_KEYS, {
+    schema: LOCAL_OUTCOME_RESULT_SCHEMA_ID,
+    version: LOCAL_OUTCOME_VERSION,
+    label: localLabel(assignmentResult, reviewNeeded, unresolved, codexAccepted),
+    assignment_result: assignmentResult,
+    codex_accepted: codexAccepted,
+    review_needed: reviewNeeded,
+    unresolved,
+    next_decision: nextDecision,
+    candidate,
+    assignments,
+    checks,
+    artifacts: artifacts.artifacts,
+    summary: projectLocalSummary(
+      candidate, assignmentResult, codexAccepted, reviewNeeded, unresolved, nextDecision,
+    ),
+    truncation,
+  });
+  return freezeData(card);
+}
+
 capturedFreeze(projectFinalDecisionCardV1);
 capturedFreeze(describeFinalDecisionCardV1);
+capturedFreeze(projectLocalOutcomeCardV1);
+capturedFreeze(rollupAssignmentResult);
diff --git a/plugins/codex-co-engineer/mcp/v3/owned-delegation.mjs b/plugins/codex-co-engineer/mcp/v3/owned-delegation.mjs
new file mode 100644
index 0000000..784c0d0
--- /dev/null
+++ b/plugins/codex-co-engineer/mcp/v3/owned-delegation.mjs
@@ -0,0 +1,536 @@
+// OwnedDelegationV1 — derive a fresh bounded correction assignment from a
+// completed, clean, exactly identified producer. Never replay an active or
+// uncertain task. Provider, model, and write scope are preserved.
+//
+// Correction rounds are a fixed chain-depth ceiling of three, independent of
+// each assignment's duration. One admitted correction child per producer;
+// different feedback against the same producer is rejected with its child id
+// rather than silently dropping feedback or branching a first-round candidate. Exhausted budget rejects before
+// provider dispatch and requires a deliberate new bounded assignment. An
+// admitted child that later fails does not replenish its consumed round.
+
+import { createHash } from 'node:crypto';
+
+import {
+  capturedFreeze,
+  capturedHasOwn,
+  capturedIncludes,
+  capturedOwnKeys,
+  capturedTest,
+  isKnownProvider,
+  isModelId,
+} from './grammar.mjs';
+import { canonicalJsonStringify } from './identity.mjs';
+import { compileOwnedCorrectionPromptV1 } from './prompt-compiler.mjs';
+import {
+  RunContractV1Error,
+  assertBaseSha,
+  assertBoundedText,
+  assertRunId,
+  isAssignmentId,
+  isSha40,
+} from './run-manifest.mjs';
+import {
+  assertDirectJsonClosure,
+  assertNotProxy,
+  assertPlainObject,
+  freezeData,
+  ownDataValue,
+} from './selection-json.mjs';
+
+export const OWNED_DELEGATION_SCHEMA_ID = 'codex-co-engineer.owned-delegation.v1';
+export const OWNED_DELEGATION_VERSION = 1;
+export const OWNED_REVISION_IDENTITY_DOMAIN = 'codex-co-engineer.owned-revision.v1';
+export const OWNED_REVISION_REQUEST_KEYS = capturedFreeze([
+  'assignment_id', 'feedback', 'expected_head', 'expected_idempotency_key',
+]);
+export const OWNED_CORRECTION_LINEAGE_KEYS = capturedFreeze([
+  'schema', 'version', 'lineage', 'producer_run_id', 'producer_assignment_id', 'reviewed_head',
+  'original_run_id', 'original_assignment_id', 'round', 'limit',
+]);
+export const OWNED_CORRECTION_FOLLOW_KEYS = capturedFreeze([
+  'child_run_id', 'child_assignment_id', 'identity_digest',
+]);
+export const OWNED_CORRECTION_ROUND_LIMIT = 3;
+export const MAX_REVISION_FEEDBACK_BYTES = 4_096;
+export const MIN_REVISION_FEEDBACK_BYTES = 1;
+export const IDEMPOTENCY_KEY_PATTERN = /^sha256:[0-9a-f]{64}$/u;
+export const AUTHORITATIVE_DISPATCH_CONFIDENCE = 'authoritative';
+export const REVISION_BUDGET_EXHAUSTED_MESSAGE = `Owned correction rounds are exhausted (${OWNED_CORRECTION_ROUND_LIMIT} of ${OWNED_CORRECTION_ROUND_LIMIT}); submit a new bounded assignment. This path does not start that assignment.`;
+
+const COMPLETED_PRODUCER_PHASES = capturedFreeze(['completed']);
+const ACTIVE_OR_UNCERTAIN_PHASES = capturedFreeze([
+  'planned', 'prepared', 'session_ready', 'prompt_dispatched', 'running',
+  'needs_attention', 'accepted', 'starting', 'cancelling', 'dispatching',
+  'validating', 'preparing_workspaces', 'awaiting_consent',
+]);
+
+function revisionError(code, field, message) {
+  throw new RunContractV1Error(code, field, message);
+}
+
+function sha256Hex(parts) {
+  return createHash('sha256')
+    .update(OWNED_REVISION_IDENTITY_DOMAIN, 'utf8')
+    .update('\0', 'utf8')
+    .update(canonicalJsonStringify(parts), 'utf8')
+    .digest('hex');
+}
+
+export function parseOwnedRevisionRequestV1(value, field = 'revision') {
+  assertNotProxy(value, field);
+  assertPlainObject(value, 'invalid_type', field, 'revision');
+  assertDirectJsonClosure(value, field);
+  for (const key of capturedOwnKeys(value)) {
+    if (typeof key !== 'string') revisionError('symbol_key_denied', field);
+    if (!capturedIncludes(OWNED_REVISION_REQUEST_KEYS, key)) {
+      revisionError('unknown_key', `${field}.${key}`, 'Revision accepts assignment_id, feedback, expected_head, and expected_idempotency_key.');
+    }
+  }
+  if (!capturedHasOwn(value, 'assignment_id')) {
+    revisionError('missing_key', `${field}.assignment_id`, 'A revision must name the exact producer assignment.');
+  }
+  const assignmentId = ownDataValue(value, 'assignment_id', `${field}.assignment_id`);
+  if (typeof assignmentId !== 'string' || !isAssignmentId(assignmentId)) {
+    revisionError('invalid_format', `${field}.assignment_id`, 'assignment_id is not valid.');
+  }
+  if (!capturedHasOwn(value, 'feedback')) {
+    revisionError('missing_key', `${field}.feedback`, 'A revision must include concise feedback.');
+  }
+  const feedback = ownDataValue(value, 'feedback', `${field}.feedback`);
+  assertBoundedText(feedback, {
+    min: MIN_REVISION_FEEDBACK_BYTES,
+    max: MAX_REVISION_FEEDBACK_BYTES,
+    path: `${field}.feedback`,
+    label: `${field}.feedback`,
+  });
+  if (!capturedHasOwn(value, 'expected_head')) {
+    revisionError('missing_key', `${field}.expected_head`, 'A revision must name the exact producer HEAD.');
+  }
+  const expectedHead = ownDataValue(value, 'expected_head', `${field}.expected_head`);
+  assertBaseSha(expectedHead, `${field}.expected_head`);
+  if (!capturedHasOwn(value, 'expected_idempotency_key')) {
+    revisionError('missing_key', `${field}.expected_idempotency_key`, 'A revision must name the producer request identity.');
+  }
+  const expectedKey = ownDataValue(value, 'expected_idempotency_key', `${field}.expected_idempotency_key`);
+  if (typeof expectedKey !== 'string' || !capturedTest(IDEMPOTENCY_KEY_PATTERN, expectedKey)) {
+    revisionError('invalid_format', `${field}.expected_idempotency_key`, 'expected_idempotency_key must be an exact sha256 digest.');
+  }
+  return freezeData({
+    assignment_id: assignmentId,
+    feedback,
+    expected_head: expectedHead,
+    expected_idempotency_key: expectedKey,
+  });
+}
+
+export function compactOwnedCorrectionLineageV1(value, field = 'correction') {
+  assertNotProxy(value, field);
+  assertPlainObject(value, 'invalid_type', field, 'correction');
+  assertDirectJsonClosure(value, field);
+  for (const key of capturedOwnKeys(value)) {
+    if (typeof key !== 'string') revisionError('symbol_key_denied', field);
+    if (!capturedIncludes(OWNED_CORRECTION_LINEAGE_KEYS, key)) {
+      revisionError('unknown_key', `${field}.${key}`, 'Correction lineage is a closed machine record.');
+    }
+  }
+  for (const key of OWNED_CORRECTION_LINEAGE_KEYS) {
+    if (!capturedHasOwn(value, key)) {
+      revisionError('missing_key', `${field}.${key}`, 'Correction lineage is incomplete.');
+    }
+  }
+  const schema = ownDataValue(value, 'schema', `${field}.schema`);
+  if (schema !== OWNED_DELEGATION_SCHEMA_ID) {
+    revisionError('invalid_format', `${field}.schema`, 'Correction lineage schema is invalid.');
+  }
+  const version = ownDataValue(value, 'version', `${field}.version`);
+  if (version !== OWNED_DELEGATION_VERSION) {
+    revisionError('invalid_format', `${field}.version`, 'Correction lineage version is invalid.');
+  }
+  const lineage = ownDataValue(value, 'lineage', `${field}.lineage`);
+  if (lineage !== 'owned_revision') {
+    revisionError('invalid_format', `${field}.lineage`, 'Correction lineage must be owned_revision.');
+  }
+  const producerRunId = ownDataValue(value, 'producer_run_id', `${field}.producer_run_id`);
+  assertRunId(producerRunId, `${field}.producer_run_id`);
+  const producerAssignmentId = ownDataValue(value, 'producer_assignment_id', `${field}.producer_assignment_id`);
+  if (typeof producerAssignmentId !== 'string' || !isAssignmentId(producerAssignmentId)) {
+    revisionError('invalid_format', `${field}.producer_assignment_id`, 'producer_assignment_id is not valid.');
+  }
+  const reviewedHead = ownDataValue(value, 'reviewed_head', `${field}.reviewed_head`);
+  assertBaseSha(reviewedHead, `${field}.reviewed_head`);
+  const originalRunId = ownDataValue(value, 'original_run_id', `${field}.original_run_id`);
+  assertRunId(originalRunId, `${field}.original_run_id`);
+  const originalAssignmentId = ownDataValue(value, 'original_assignment_id', `${field}.original_assignment_id`);
+  if (typeof originalAssignmentId !== 'string' || !isAssignmentId(originalAssignmentId)) {
+    revisionError('invalid_format', `${field}.original_assignment_id`, 'original_assignment_id is not valid.');
+  }
+  const round = ownDataValue(value, 'round', `${field}.round`);
+  const limit = ownDataValue(value, 'limit', `${field}.limit`);
+  if (!Number.isSafeInteger(limit) || limit !== OWNED_CORRECTION_ROUND_LIMIT) {
+    revisionError(
+      'invalid_format',
+      `${field}.limit`,
+      `Correction round limit is the fixed ceiling of ${OWNED_CORRECTION_ROUND_LIMIT}.`,
+    );
+  }
+  if (!Number.isSafeInteger(round) || round < 1 || round > limit) {
+    revisionError('invalid_format', `${field}.round`, 'Correction round is outside the fixed ceiling.');
+  }
+  return freezeData({
+    schema: OWNED_DELEGATION_SCHEMA_ID,
+    version: OWNED_DELEGATION_VERSION,
+    lineage: 'owned_revision',
+    producer_run_id: producerRunId,
+    producer_assignment_id: producerAssignmentId,
+    reviewed_head: reviewedHead,
+    original_run_id: originalRunId,
+    original_assignment_id: originalAssignmentId,
+    round,
+    limit,
+  });
+}
+
+export function compactOwnedCorrectionFollowV1(value, field = 'correction_follow') {
+  assertNotProxy(value, field);
+  assertPlainObject(value, 'invalid_type', field, 'correction follow');
+  assertDirectJsonClosure(value, field);
+  for (const key of capturedOwnKeys(value)) {
+    if (typeof key !== 'string') revisionError('symbol_key_denied', field);
+    if (!capturedIncludes(OWNED_CORRECTION_FOLLOW_KEYS, key)) {
+      revisionError('unknown_key', `${field}.${key}`, 'Correction follow is a closed machine record.');
+    }
+  }
+  for (const key of OWNED_CORRECTION_FOLLOW_KEYS) {
+    if (!capturedHasOwn(value, key)) {
+      revisionError('missing_key', `${field}.${key}`, 'Correction follow is incomplete.');
+    }
+  }
+  const childRunId = ownDataValue(value, 'child_run_id', `${field}.child_run_id`);
+  assertRunId(childRunId, `${field}.child_run_id`);
+  const childAssignmentId = ownDataValue(value, 'child_assignment_id', `${field}.child_assignment_id`);
+  if (typeof childAssignmentId !== 'string' || !isAssignmentId(childAssignmentId)) {
+    revisionError('invalid_format', `${field}.child_assignment_id`, 'child_assignment_id is not valid.');
+  }
+  const identityDigest = ownDataValue(value, 'identity_digest', `${field}.identity_digest`);
+  if (typeof identityDigest !== 'string' || !capturedTest(IDEMPOTENCY_KEY_PATTERN, identityDigest)) {
+    revisionError('invalid_format', `${field}.identity_digest`, 'identity_digest must be an exact sha256 digest.');
+  }
+  return freezeData({
+    child_run_id: childRunId,
+    child_assignment_id: childAssignmentId,
+    identity_digest: identityDigest,
+  });
+}
+
+export function ownedCorrectionPolicyV1(producer, field = 'revision') {
+  if (!producer || typeof producer !== 'object') {
+    revisionError('revision_producer_not_found', field, 'The named producer assignment is not known.');
+  }
+  if (typeof producer.run_id !== 'string') {
+    revisionError('revision_producer_not_found', field, 'The named producer assignment is not known.');
+  }
+  assertRunId(producer.run_id, `${field}.run_id`);
+  if (typeof producer.assignment_id !== 'string' || !isAssignmentId(producer.assignment_id)) {
+    revisionError('invalid_format', `${field}.assignment_id`, 'assignment_id is not valid.');
+  }
+  if (producer.correction != null) {
+    const parent = compactOwnedCorrectionLineageV1(producer.correction, `${field}.correction`);
+    return freezeData({
+      original_run_id: parent.original_run_id,
+      original_assignment_id: parent.original_assignment_id,
+      producer_run_id: producer.run_id,
+      producer_assignment_id: producer.assignment_id,
+      round: parent.round + 1,
+      limit: parent.limit,
+    });
+  }
+  return freezeData({
+    original_run_id: producer.run_id,
+    original_assignment_id: producer.assignment_id,
+    producer_run_id: producer.run_id,
+    producer_assignment_id: producer.assignment_id,
+    round: 1,
+    limit: OWNED_CORRECTION_ROUND_LIMIT,
+  });
+}
+
+export function assertOwnedCorrectionBudgetV1(policy, field = 'revision') {
+  if (!policy || typeof policy !== 'object'
+    || !Number.isSafeInteger(policy.round)
+    || !Number.isSafeInteger(policy.limit)
+    || policy.limit !== OWNED_CORRECTION_ROUND_LIMIT) {
+    revisionError('invalid_format', field, 'Correction round policy is invalid.');
+  }
+  if (policy.round > policy.limit) {
+    revisionError('revision_budget_exhausted', field, REVISION_BUDGET_EXHAUSTED_MESSAGE);
+  }
+  if (policy.round < 1) {
+    revisionError('invalid_format', `${field}.round`, 'Correction round is outside the fixed ceiling.');
+  }
+  return policy;
+}
+
+export function ownedCorrectionBudgetRemainingV1(correction) {
+  if (correction == null) return true;
+  if (typeof correction !== 'object') return false;
+  const round = correction.round;
+  const limit = correction.limit;
+  if (!Number.isSafeInteger(round) || !Number.isSafeInteger(limit) || limit !== OWNED_CORRECTION_ROUND_LIMIT) {
+    return false;
+  }
+  return round < limit;
+}
+
+export function ownedRevisionIdentityV1({ producer, revision }) {
+  const digestHex = sha256Hex({
+    producer_run_id: producer.run_id,
+    producer_assignment_id: producer.assignment_id,
+    producer_task_id: producer.task_id ?? null,
+    expected_head: revision.expected_head,
+    expected_idempotency_key: revision.expected_idempotency_key,
+    feedback: revision.feedback,
+    provider: producer.provider,
+    model: producer.model,
+    write_scope: [...(producer.write_scope ?? [])],
+  });
+  const runId = `rev-${digestHex.slice(0, 16)}`;
+  assertRunId(runId, 'owned_revision.run_id');
+  return freezeData({
+    schema: OWNED_DELEGATION_SCHEMA_ID,
+    version: OWNED_DELEGATION_VERSION,
+    digest: `sha256:${digestHex}`,
+    run_id: runId,
+    assignment_id: producer.assignment_id,
+    producer_run_id: producer.run_id,
+    producer_assignment_id: producer.assignment_id,
+  });
+}
+
+function producerPhase(producer) {
+  return typeof producer?.phase === 'string'
+    ? producer.phase
+    : (typeof producer?.status === 'string' ? producer.status : null);
+}
+
+export function assertOwnedRevisionProducerV1(producer, revision, field = 'revision') {
+  if (!producer || typeof producer !== 'object') {
+    revisionError('revision_producer_not_found', field, 'The named producer assignment is not known.');
+  }
+  if (producer.assignment_id !== revision.assignment_id) {
+    revisionError('revision_producer_not_found', `${field}.assignment_id`, 'The named producer assignment is not known.');
+  }
+  const phase = producerPhase(producer);
+  const confidence = producer.dispatch_confidence;
+  const unproven = producer.prompt_dispatched !== true
+    || confidence !== AUTHORITATIVE_DISPATCH_CONFIDENCE
+    || capturedIncludes(ACTIVE_OR_UNCERTAIN_PHASES, phase);
+  if (unproven || !capturedIncludes(COMPLETED_PRODUCER_PHASES, phase)) {
+    revisionError(
+      'revision_producer_active',
+      field,
+      'A revision requires a completed, certain producer; active or uncertain tasks are never replayed.',
+    );
+  }
+  if (typeof producer.task_id !== 'string' || producer.task_id.length === 0) {
+    revisionError(
+      'revision_lifecycle_unfinal',
+      field,
+      'A revision requires proven terminal lifecycle; a missing task is not a completed producer.',
+    );
+  }
+  if (producer.clean !== true) {
+    revisionError('revision_producer_dirty', field, 'A revision requires a clean producer worktree.');
+  }
+  const head = typeof producer.head === 'string' ? producer.head.toLowerCase() : null;
+  if (!isSha40(head) || head !== revision.expected_head) {
+    revisionError('revision_producer_stale', `${field}.expected_head`, 'expected_head does not match the exact producer HEAD.');
+  }
+  if (producer.request_idempotency_key !== revision.expected_idempotency_key) {
+    revisionError(
+      'revision_identity_mismatch',
+      `${field}.expected_idempotency_key`,
+      'expected_idempotency_key does not match the producer request identity.',
+    );
+  }
+  if (typeof producer.provider !== 'string' || !isKnownProvider(producer.provider)
+    || typeof producer.model !== 'string' || !isModelId(producer.model)) {
+    revisionError('revision_authority_missing', field, 'The producer provider and model must remain exact.');
+  }
+  if (!Array.isArray(producer.write_scope)) {
+    revisionError('revision_scope_missing', field, 'The producer write scope must remain exact.');
+  }
+  if (typeof producer.repo !== 'string' || producer.repo.length === 0) {
+    revisionError('revision_producer_not_found', field, 'The producer repository path is missing.');
+  }
+  return producer;
+}
+
+function collectRetrievableArtifactRefs(value, assignmentId, refs) {
+  if (!Array.isArray(value)) return;
+  for (const entry of value.slice(0, 8)) {
+    if (!entry || typeof entry !== 'object') continue;
+    if (typeof entry.relative_path !== 'string' || typeof entry.artifact_kind !== 'string') continue;
+    const digest = typeof entry.sha256 === 'string'
+      ? entry.sha256
+      : (typeof entry.digest === 'string' ? entry.digest : null);
+    if (typeof digest !== 'string') continue;
+    refs.push(freezeData({
+      kind: 'artifact',
+      artifact_kind: entry.artifact_kind,
+      relative_path: entry.relative_path,
+      digest: digest.startsWith('sha256:') ? digest : `sha256:${digest}`,
+      ...(typeof assignmentId === 'string' ? { assignment_id: assignmentId } : {}),
+    }));
+  }
+}
+
+export function projectOwnedProducerCandidateV1({
+  record,
+  assignment,
+  lane,
+  workspace = null,
+} = {}) {
+  if (!record || !assignment || !lane) {
+    revisionError('revision_producer_not_found', 'producer', 'The named producer assignment is not known.');
+  }
+  if (assignment.provider === 'cursor-cloud') {
+    revisionError(
+      'revision_workspace_unsupported',
+      'revision',
+      'Remote candidate revision is not supported; a local inspectable HEAD is required.',
+    );
+  }
+  if (!workspace || typeof workspace !== 'object' || Array.isArray(workspace)) {
+    revisionError(
+      'revision_workspace_uninspectable',
+      'workspace',
+      'A revision requires a fresh successful workspace inspection.',
+    );
+  }
+  const head = typeof workspace.current_head === 'string'
+    ? workspace.current_head.toLowerCase()
+    : null;
+  if (!isSha40(head)) {
+    revisionError(
+      'revision_workspace_uninspectable',
+      'workspace.current_head',
+      'A revision requires a fresh exact HEAD from a successful workspace inspection.',
+    );
+  }
+  if (workspace.clean !== true && workspace.clean !== false) {
+    revisionError(
+      'revision_workspace_uninspectable',
+      'workspace.clean',
+      'A revision requires fresh clean proof from a successful workspace inspection.',
+    );
+  }
+  const manifestAssignment = Array.isArray(record.compiled?.manifest?.assignments)
+    ? record.compiled.manifest.assignments.find((entry) => entry?.assignment_id === assignment.assignment_id)
+    : null;
+  const evidenceRefs = [];
+  collectRetrievableArtifactRefs(lane.artifact_refs, assignment.assignment_id, evidenceRefs);
+  collectRetrievableArtifactRefs(record.artifact_refs, assignment.assignment_id, evidenceRefs);
+  return freezeData({
+    run_id: record.run_id,
+    assignment_id: assignment.assignment_id,
+    task_id: assignment.task_id ?? lane.task_id ?? null,
+    provider: assignment.provider,
+    model: assignment.model,
+    role: assignment.role,
+    access: assignment.access,
+    write_scope: [...(assignment.write_scope ?? [])],
+    capabilities: [...(assignment.capabilities ?? [])],
+    expected_duration_ms: assignment.expected_duration_ms,
+    repo: record.compiled?.repo ?? record.compiled?.git?.repository_path ?? null,
+    objective: record.compiled?.objective ?? null,
+    prompt: typeof assignment.prompt === 'string' ? assignment.prompt : null,
+    acceptance: Array.isArray(manifestAssignment?.acceptance) ? [...manifestAssignment.acceptance] : [],
+    required_evidence: Array.isArray(manifestAssignment?.required_evidence)
+      ? [...manifestAssignment.required_evidence]
+      : [],
+    request_idempotency_key: record.compiled?.request_idempotency_key ?? null,
+    phase: lane.phase ?? lane.status ?? null,
+    status: lane.status ?? lane.phase ?? null,
+    prompt_dispatched: lane.prompt_dispatched === true,
+    dispatch_confidence: lane.dispatch_confidence ?? null,
+    head,
+    clean: workspace.clean === true,
+    evidence_refs: evidenceRefs,
+    ...(record.correction ? { correction: record.correction } : {}),
+  });
+}
+
+export function deriveOwnedRevisionRequestV1(producer, revisionInput) {
+  const revision = parseOwnedRevisionRequestV1(revisionInput);
+  assertOwnedRevisionProducerV1(producer, revision);
+  const policy = assertOwnedCorrectionBudgetV1(ownedCorrectionPolicyV1(producer));
+  const identity = ownedRevisionIdentityV1({ producer, revision });
+  const prompt = compileOwnedCorrectionPromptV1({
+    producer_run_id: producer.run_id,
+    producer_assignment_id: producer.assignment_id,
+    feedback: revision.feedback,
+    write_scope: producer.write_scope,
+    provider: producer.provider,
+    model: producer.model,
+    access: producer.access,
+    capabilities: producer.capabilities,
+    objective: producer.objective,
+    original_prompt: producer.prompt,
+    acceptance: producer.acceptance,
+    required_evidence: producer.required_evidence,
+    expected_head: revision.expected_head,
+  });
+  const objective = `Correct the reviewed ${producer.assignment_id} candidate.`;
+  const assignment = {
+    assignment_id: producer.assignment_id,
+    provider: producer.provider,
+    model: producer.model,
+    role: producer.role ?? 'implement',
+    prompt,
+    expected_duration_ms: producer.expected_duration_ms,
+    write_scope: [...producer.write_scope],
+    required: true,
+    ...(Array.isArray(producer.capabilities)
+      ? { capabilities: [...producer.capabilities] }
+      : {}),
+  };
+  if (producer.access !== undefined) assignment.access = producer.access === 'writer' ? 'write' : producer.access;
+  const correction = compactOwnedCorrectionLineageV1({
+    schema: OWNED_DELEGATION_SCHEMA_ID,
+    version: OWNED_DELEGATION_VERSION,
+    lineage: 'owned_revision',
+    producer_run_id: producer.run_id,
+    producer_assignment_id: producer.assignment_id,
+    reviewed_head: revision.expected_head,
+    original_run_id: policy.original_run_id,
+    original_assignment_id: policy.original_assignment_id,
+    round: policy.round,
+    limit: policy.limit,
+  });
+  return freezeData({
+    schema: OWNED_DELEGATION_SCHEMA_ID,
+    version: OWNED_DELEGATION_VERSION,
+    identity,
+    producer_run_id: producer.run_id,
+    correction,
+    run_request: freezeData({
+      run_id: identity.run_id,
+      repo: producer.repo,
+      objective,
+      base_sha: revision.expected_head,
+      assignments: [freezeData(assignment)],
+    }),
+  });
+}
+
+capturedFreeze(parseOwnedRevisionRequestV1);
+capturedFreeze(ownedRevisionIdentityV1);
+capturedFreeze(compactOwnedCorrectionLineageV1);
+capturedFreeze(compactOwnedCorrectionFollowV1);
+capturedFreeze(ownedCorrectionPolicyV1);
+capturedFreeze(assertOwnedCorrectionBudgetV1);
+capturedFreeze(ownedCorrectionBudgetRemainingV1);
+capturedFreeze(assertOwnedRevisionProducerV1);
+capturedFreeze(projectOwnedProducerCandidateV1);
+capturedFreeze(deriveOwnedRevisionRequestV1);
diff --git a/plugins/codex-co-engineer/mcp/v3/prompt-compiler.mjs b/plugins/codex-co-engineer/mcp/v3/prompt-compiler.mjs
index 4d12529..d221776 100644
--- a/plugins/codex-co-engineer/mcp/v3/prompt-compiler.mjs
+++ b/plugins/codex-co-engineer/mcp/v3/prompt-compiler.mjs
@@ -732,3 +732,114 @@ export function parseChildEnvelopeV1(envelopeText) {
     envelope_text: envelopeText,
   });
 }
+
+const CORRECTION_PROMPT_PREFIX = 'This is a fresh correction workspace already at the reviewed commit. Implementation and all commits must occur in the current assigned working directory. Original run, assignment, and repository paths are lineage and reference, not navigation. Inspect pwd and Git identity and report a mismatch instead of seeking the producer worktree. Preserve the provider, model, write scope, access, and capabilities. Do not recreate worktrees, receipts, or lifecycle paperwork. Implement only the requested correction.';
+
+function correctionScopeSection(writeScope, access) {
+  const readOnly = access === 'read_only' || access === 'read';
+  if (readOnly) return 'Write access: read-only; no write scope.';
+  if (!Array.isArray(writeScope) || writeScope.length === 0) {
+    return 'Write scope: none.';
+  }
+  return ['Write scope:', ...writeScope.map((pattern) => `- ${pattern}`)].join('\n');
+}
+
+function correctionAcceptanceSection(acceptance, requiredEvidence) {
+  const lines = ['Acceptance constraints:'];
+  if (Array.isArray(acceptance) && acceptance.length > 0) {
+    for (const entry of acceptance) {
+      if (typeof entry === 'string' && entry.length > 0) {
+        lines.push(`- ${entry}`);
+        continue;
+      }
+      if (!entry || typeof entry !== 'object') continue;
+      const commandId = typeof entry.command_id === 'string' ? entry.command_id : null;
+      if (commandId) lines.push(`- ${commandId}`);
+    }
+  } else {
+    lines.push('- none specified');
+  }
+  if (Array.isArray(requiredEvidence) && requiredEvidence.length > 0) {
+    lines.push(`Required evidence: ${requiredEvidence.filter((kind) => typeof kind === 'string').join(', ')}`);
+  }
+  return lines.join('\n');
+}
+
+/**
+ * Build the opaque assignment.prompt for an owned correction. The child
+ * envelope template is unchanged; this text is framed as the prompt block.
+ */
+export function compileOwnedCorrectionPromptV1({
+  producer_run_id: producerRunId,
+  producer_assignment_id: producerAssignmentId,
+  feedback,
+  write_scope: writeScope,
+  provider,
+  model,
+  access,
+  capabilities,
+  objective,
+  original_prompt: originalPrompt,
+  acceptance,
+  required_evidence: requiredEvidence,
+  expected_head: expectedHead,
+} = {}) {
+  if (typeof producerAssignmentId !== 'string' || !ASSIGNMENT_ID_PATTERN.test(producerAssignmentId)) {
+    fail('invalid_format', 'producer_assignment_id', 'A correction prompt requires the exact producer assignment_id.');
+  }
+  assertBoundedText(feedback, {
+    min: 1,
+    max: PROMPT_MAX_BYTES,
+    path: 'feedback',
+    label: 'feedback',
+  });
+  const identityLine = typeof producerRunId === 'string'
+    ? `Producer: ${producerRunId}/${producerAssignmentId}`
+    : `Producer assignment: ${producerAssignmentId}`;
+  const reviewedHead = typeof expectedHead === 'string' && SHA40_PATTERN.test(expectedHead)
+    ? `Reviewed HEAD: ${expectedHead}`
+    : null;
+  const executionParts = [];
+  if (typeof provider === 'string') {
+    executionParts.push(`Execution remains ${provider}${typeof model === 'string' ? `/${model}` : ''}.`);
+  } else {
+    executionParts.push('Execution remains the producer provider and model.');
+  }
+  if (typeof access === 'string') executionParts.push(`Access remains ${access}.`);
+  if (Array.isArray(capabilities) && capabilities.length > 0) {
+    executionParts.push(`Capabilities remain ${capabilities.join(', ')}.`);
+  }
+  const originalObjective = typeof objective === 'string' && objective.length > 0 ? objective : '';
+  const originalAssignment = typeof originalPrompt === 'string' && originalPrompt.length > 0 ? originalPrompt : '';
+  const lineage = typeof producerRunId === 'string'
+    ? `Correction lineage: fresh owned revision of ${producerRunId}/${producerAssignmentId}.`
+    : `Correction lineage: fresh owned revision of ${producerAssignmentId}.`;
+  const prompt = [
+    CORRECTION_PROMPT_PREFIX,
+    identityLine,
+    ...(reviewedHead ? [reviewedHead] : []),
+    executionParts.join(' '),
+    correctionScopeSection(writeScope, access),
+    ...(originalObjective ? ['Original objective:', originalObjective] : []),
+    ...(originalAssignment ? ['Original assignment:', originalAssignment] : []),
+    correctionAcceptanceSection(acceptance, requiredEvidence),
+    lineage,
+    'Feedback:',
+    feedback,
+  ].join('\n');
+  const promptBytes = utf8ByteLength(prompt);
+  if (promptBytes > PROMPT_MAX_BYTES) {
+    fail(
+      'bounded_context_overflow',
+      'prompt',
+      `The derived correction prompt is ${promptBytes} bytes and cannot preserve original constraints within the ${PROMPT_MAX_BYTES}-byte assignment bound.`,
+    );
+  }
+  assertBoundedText(prompt, {
+    min: PROMPT_MIN_BYTES,
+    max: PROMPT_MAX_BYTES,
+    path: 'prompt',
+    label: 'owned correction prompt',
+  });
+  return prompt;
+}
diff --git a/plugins/codex-co-engineer/mcp/v3/run-admission-store.mjs b/plugins/codex-co-engineer/mcp/v3/run-admission-store.mjs
index 109b30a..c1178e2 100644
--- a/plugins/codex-co-engineer/mcp/v3/run-admission-store.mjs
+++ b/plugins/codex-co-engineer/mcp/v3/run-admission-store.mjs
@@ -10,7 +10,8 @@ import { randomUUID } from 'node:crypto';
 import { chmod, mkdir, open, rename, lstat, unlink } from 'node:fs/promises';
 import path from 'node:path';
 
-import { assertRunId } from './run-manifest.mjs';
+import { assertRunId, isAssignmentId } from './run-manifest.mjs';
+import { compactOwnedCorrectionFollowV1 } from './owned-delegation.mjs';
 import { assertDirectJsonClosure } from './selection-json.mjs';
 
 export const RUN_ADMISSION_STORE_SCHEMA = 'codex-co-engineer.run-admission-store.v1';
@@ -223,9 +224,81 @@ export function createRunAdmissionStore(root) {
     }
   }
 
+  // Exclusive durable reservation before child admission. A second MCP process
+  // may inspect the same child, but cannot dispatch a competing correction.
+  // A crash before child persistence leaves a pending reservation: do not
+  // automatically reclaim it or assume the provider did no work.
+  async function reserveRevision(producerRunId, assignmentId, followInput) {
+    safeRunId(producerRunId);
+    if (!isAssignmentId(assignmentId)) storeError('run_store_identity_invalid', 'Invalid correction assignment.');
+    const follow = compactOwnedCorrectionFollowV1(followInput);
+    const target = path.join(directory, `${producerRunId}.${assignmentId}.revision.json`);
+    const schema = 'codex-co-engineer.owned-revision-reservation.v1';
+    const reservationId = randomUUID();
+    await initialize();
+    const rootHandle = await openRoot(directory);
+    let handle;
+    try {
+      try {
+        handle = await open(target, WRITE_FLAGS, 0o600);
+      } catch (error) {
+        if (error?.code !== 'EEXIST') throw error;
+        const existing = await open(target, READ_FLAGS);
+        try {
+          const metadata = await existing.stat();
+          assertPrivateFile(metadata);
+          if (metadata.size > 2048) storeError('run_store_record_too_large', 'Correction reservation exceeds its bound.');
+          let record;
+          try { record = JSON.parse(await existing.readFile('utf8')); } catch {
+            storeError('revision_admission_pending', 'Correction reservation is pending; inspect before retrying.');
+          }
+          if (record?.schema !== schema || record.producer_run_id !== producerRunId
+            || record.assignment_id !== assignmentId || typeof record.reservation_id !== 'string') {
+            storeError('run_store_identity_mismatch', 'Correction reservation identity differs.');
+          }
+          return { reserved: false, follow: compactOwnedCorrectionFollowV1(record.follow) };
+        } finally {
+          await existing.close();
+        }
+      }
+      const text = JSON.stringify({ schema, producer_run_id: producerRunId,
+        assignment_id: assignmentId, reservation_id: reservationId, follow });
+      await handle.chmod(0o600);
+      await handle.writeFile(text, 'utf8');
+      await handle.sync();
+      const written = await handle.stat();
+      assertPrivateFile(written);
+      await rootHandle.handle.sync();
+      return {
+        reserved: true,
+        follow,
+        // Only the winning caller can release its own pre-admission failure.
+        // An admitted child, including failed work, permanently consumes it.
+        release: async () => {
+          const existing = await open(target, READ_FLAGS);
+          try {
+            const metadata = await existing.stat();
+            assertPrivateFile(metadata);
+            if (metadata.ino !== written.ino || metadata.dev !== written.dev) {
+              storeError('run_store_record_changed', 'Correction reservation changed.');
+            }
+            const record = JSON.parse(await existing.readFile('utf8'));
+            if (record.reservation_id !== reservationId) storeError('run_store_record_changed', 'Correction reservation changed.');
+            await unlink(target);
+          } finally {
+            await existing.close();
+          }
+        },
+      };
+    } finally {
+      await handle?.close().catch(() => {});
+      await rootHandle.handle.close().catch(() => {});
+    }
+  }
+
   async function has(runId) {
     return (await load(runId)) !== null;
   }
 
-  return Object.freeze({ directory, load, save, has });
+  return Object.freeze({ directory, load, save, has, reserveRevision });
 }
diff --git a/plugins/codex-co-engineer/mcp/v3/run-admission.mjs b/plugins/codex-co-engineer/mcp/v3/run-admission.mjs
index e89e9a1..2281fd0 100644
--- a/plugins/codex-co-engineer/mcp/v3/run-admission.mjs
+++ b/plugins/codex-co-engineer/mcp/v3/run-admission.mjs
@@ -47,6 +47,13 @@ import {
   validateRunIdentityV1,
   validateWorkspaceIdentityV1,
 } from './protected-identity.mjs';
+import { projectAdmissionUsageLedgerV1 } from './admission-usage.mjs';
+import {
+  compactOwnedCorrectionFollowV1,
+  compactOwnedCorrectionLineageV1,
+  ownedCorrectionPolicyV1,
+  assertOwnedCorrectionBudgetV1,
+} from './owned-delegation.mjs';
 
 export const RUN_ADMISSION_SCHEMA_ID = 'codex-co-engineer.run-admission.v1';
 export const RUN_ADMISSION_VERSION = 1;
@@ -93,7 +100,7 @@ export const RUN_ADMISSION_DEPENDENCIES = capturedFreeze([
   'verifyRepository', 'prepareWorkspace', 'cleanupWorkspace', 'createSession',
   'dispatchPrompt', 'inspectLane', 'reconnectLane', 'replyAttention', 'cancelLane',
   'inspectWorkspace', 'buildHandoff', 'verifyRun', 'clock', 'sleep', 'compile',
-  'loadRecord', 'persistRecord', 'waitForProgress',
+  'loadRecord', 'persistRecord', 'waitForProgress', 'reserveRevision',
 ]);
 const MAX_PROVIDER_RESULT_BYTES = 8 * 1024;
 
@@ -583,6 +590,31 @@ function validatePersistedRecord(record, runId) {
           'Persisted workspace identity is invalid.');
       }
     }
+    if (capturedHasOwn(lane, 'correction_follow') && lane.correction_follow != null) {
+      try {
+        lane.correction_follow = compactOwnedCorrectionFollowV1(
+          lane.correction_follow,
+          `persisted_run.lanes[${index}].correction_follow`,
+        );
+      } catch (error) {
+        if (error instanceof RunContractV1Error) {
+          admissionError('durable_state_mismatch', `persisted_run.lanes[${index}].correction_follow`,
+            'Persisted correction follow is invalid.');
+        }
+        throw error;
+      }
+    }
+  }
+  if (capturedHasOwn(record, 'correction') && record.correction != null) {
+    try {
+      record.correction = compactOwnedCorrectionLineageV1(record.correction, 'persisted_run.correction');
+    } catch (error) {
+      if (error instanceof RunContractV1Error) {
+        admissionError('durable_state_mismatch', 'persisted_run.correction',
+          'Persisted correction lineage is invalid.');
+      }
+      throw error;
+    }
   }
   if (seen.size !== assignments.length) {
     admissionError('durable_state_mismatch', 'persisted_run.lanes',
@@ -752,7 +784,13 @@ function boundedHandoff(value, fallback) {
   return freezeData(candidate);
 }
 
-function laneReceipt(lane) {
+function laneReceipt(lane, compiled) {
+  const assignment = Array.isArray(compiled?.assignments)
+    ? compiled.assignments.find((entry) => entry?.assignment_id === lane.assignment_id)
+    : null;
+  const head = typeof lane.handoff?.current_head === 'string'
+    ? lane.handoff.current_head.toLowerCase()
+    : null;
   return {
     assignment_id: lane.assignment_id,
     task_id: lane.task_id,
@@ -760,6 +798,9 @@ function laneReceipt(lane) {
     model: lane.model,
     role: lane.role,
     access: lane.access,
+    write_scope: Array.isArray(assignment?.write_scope)
+      ? [...assignment.write_scope]
+      : (Array.isArray(lane.write_scope) ? [...lane.write_scope] : []),
     required: lane.required,
     phase: lane.phase,
     status: laneStatus(lane.phase),
@@ -780,9 +821,14 @@ function laneReceipt(lane) {
     provider_run_identity_digest: lane.provider_run_identity?.digest ?? null,
     workspace_identity_digest: lane.workspace_identity?.digest ?? null,
     workspace_identity: lane.workspace_identity ?? null,
+    request_idempotency_key: compiled?.request_idempotency_key ?? null,
+    head,
+    clean: typeof lane.handoff?.clean === 'boolean' ? lane.handoff.clean : null,
+    artifact_refs: Array.isArray(lane.artifact_refs) ? lane.artifact_refs : [],
     error: lane.error ?? null,
     recovery_classification: lane.recovery_classification ?? null,
     handoff: lane.handoff ?? null,
+    ...(lane.correction_follow ? { correction_follow: lane.correction_follow } : {}),
   };
 }
 
@@ -796,18 +842,20 @@ function receipt(record, extras = {}) {
     schema: RUN_ADMISSION_SCHEMA_ID,
     version: RUN_ADMISSION_VERSION,
     run_id: record.run_id,
+    persisted: true,
     phase: record.phase,
     status: record.phase,
     revision: record.revision,
     cursor: String(record.revision),
     objective: record.compiled.objective,
     base_sha: record.compiled.git.base_sha,
+    request_idempotency_key: record.compiled.request_idempotency_key ?? null,
     git: {
       base_sha: record.compiled.git.base_sha,
       digest: record.compiled.git_identity.digest,
     },
     assignment_count: record.lanes.length,
-    lanes: record.lanes.map(laneReceipt),
+    lanes: record.lanes.map((lane) => laneReceipt(lane, record.compiled)),
     consent: record.consent_request
       ? { status: record.consent_status, request: record.consent_request }
       : {
@@ -830,6 +878,8 @@ function receipt(record, extras = {}) {
     // are immutable snapshots, while later cancellation/reconciliation still
     // needs to update the record's counters.
     telemetry: { ...record.telemetry },
+    usage_ledger: projectAdmissionUsageLedgerV1(record),
+    ...(record.correction ? { correction: record.correction } : {}),
     ...extras,
   });
 }
@@ -929,6 +979,13 @@ function createDefaultDependencies(overrides) {
     compile: compileRunRequestV1,
     loadRecord: async () => null,
     persistRecord: async () => {},
+    reserveRevision: async () => {
+      admissionError(
+        'revision_reservation_unavailable',
+        'reserveRevision',
+        'Revision admission requires an atomic reservation.',
+      );
+    },
   };
   for (const key of RUN_ADMISSION_DEPENDENCIES) {
     if (capturedHasOwn(overrides ?? {}, key)) {
@@ -993,12 +1050,13 @@ export function createRunAdmissionRuntime(overrides = {}) {
     record.updated_at = nowIso(injected.clock);
   }
 
-  function makeRecord(compiled) {
+  function makeRecord(compiled, correction = null) {
     return {
       schema: RUN_ADMISSION_SCHEMA_ID,
       version: RUN_ADMISSION_VERSION,
       run_id: compiled.run_id,
       compiled,
+      ...(correction ? { correction } : {}),
       phase: 'validating',
       revision: 0,
       created_at: nowIso(injected.clock),
@@ -1729,6 +1787,9 @@ export function createRunAdmissionRuntime(overrides = {}) {
   async function submitRunRequest(request, options = {}) {
     const compiled = await injected.compile(request, options.compile_options ?? {});
     const { runId } = validateCompiled(compiled);
+    const correction = capturedHasOwn(options, 'correction') && options.correction != null
+      ? compactOwnedCorrectionLineageV1(options.correction, 'correction')
+      : null;
     return enqueue(runId, async () => {
       const existing = await loadRecord(runId);
       if (existing) {
@@ -1737,7 +1798,7 @@ export function createRunAdmissionRuntime(overrides = {}) {
         }
         return receipt(existing, { idempotent: true });
       }
-      const record = makeRecord(compiled);
+      const record = makeRecord(compiled, correction);
       records.set(runId, record);
       bump(record);
       await persist(record);
@@ -1748,6 +1809,96 @@ export function createRunAdmissionRuntime(overrides = {}) {
     });
   }
 
+  async function submitOwnedRevision(producerRunId, derived, options = {}) {
+    assertRunId(producerRunId, 'producer_run_id');
+    if (!derived || typeof derived !== 'object' || Array.isArray(derived)) {
+      admissionError('invalid_type', 'correction', 'Owned revision derivation is invalid.');
+    }
+    const identity = derived.identity;
+    if (!identity || typeof identity !== 'object' || Array.isArray(identity)
+      || typeof identity.run_id !== 'string'
+      || typeof identity.assignment_id !== 'string'
+      || typeof identity.digest !== 'string') {
+      admissionError('invalid_format', 'correction', 'Owned revision identity is incomplete.');
+    }
+    assertRunId(identity.run_id, 'owned_revision.run_id');
+    if (!isAssignmentId(identity.assignment_id)) {
+      admissionError('invalid_format', 'owned_revision.assignment_id', 'assignment_id is not valid.');
+    }
+    const correction = compactOwnedCorrectionLineageV1(derived.correction, 'correction');
+    const follow = compactOwnedCorrectionFollowV1({
+      child_run_id: identity.run_id,
+      child_assignment_id: identity.assignment_id,
+      identity_digest: identity.digest,
+    }, 'correction_follow');
+    if (identity.run_id === producerRunId) {
+      admissionError('run_identity_conflict', 'owned_revision.run_id',
+        'A correction child cannot reuse the producer run identity.');
+    }
+    return enqueue(producerRunId, async () => {
+      const producer = await loadRecord(producerRunId);
+      if (!producer) admissionError('revision_producer_not_found', 'run_id',
+        'The named producer assignment is not known.');
+      const lane = producer.lanes.find((entry) => entry.assignment_id === correction.producer_assignment_id);
+      if (!lane || correction.producer_run_id !== producer.run_id) {
+        admissionError('revision_producer_not_found', 'revision.assignment_id',
+          'The named producer assignment is not known.');
+      }
+      const existingFollow = lane.correction_follow
+        ? compactOwnedCorrectionFollowV1(lane.correction_follow, 'correction_follow')
+        : null;
+      if (existingFollow && existingFollow.identity_digest !== follow.identity_digest) {
+        admissionError('revision_child_exists', 'revision',
+          `Feedback was not applied. Inspect correction child ${existingFollow.child_run_id}; this producer already consumed its correction slot.`);
+      }
+      const expected = assertOwnedCorrectionBudgetV1(ownedCorrectionPolicyV1({
+        run_id: producer.run_id,
+        assignment_id: correction.producer_assignment_id,
+        ...(producer.correction ? { correction: producer.correction } : {}),
+      }));
+      if (correction.round !== expected.round
+        || correction.limit !== expected.limit
+        || correction.original_run_id !== expected.original_run_id
+        || correction.original_assignment_id !== expected.original_assignment_id) {
+        admissionError('durable_state_mismatch', 'correction',
+          'Derived correction lineage does not match the producer round policy.');
+      }
+      const reservation = await injected.reserveRevision(producerRunId, lane.assignment_id, follow);
+      if (reservation.reserved !== true) {
+        const reservedFollow = compactOwnedCorrectionFollowV1(reservation.follow, 'correction_follow');
+        if (reservedFollow.identity_digest !== follow.identity_digest
+          || reservedFollow.child_run_id !== follow.child_run_id
+          || reservedFollow.child_assignment_id !== follow.child_assignment_id) {
+          admissionError('revision_child_exists', 'revision',
+            `Feedback was not applied. Inspect correction child ${reservedFollow.child_run_id}; this producer already consumed its correction slot.`);
+        }
+        const child = await loadRecord(reservedFollow.child_run_id);
+        if (!child) admissionError('revision_admission_pending', 'revision',
+          `Correction ${reservedFollow.child_run_id} is reserved but its receipt is unavailable; inspect before starting new work.`);
+        return inspectRun({ run_id: child.run_id });
+      }
+      lane.correction_follow = follow;
+      bump(producer);
+      await persist(producer);
+      try {
+        return await submitRunRequest(derived.run_request, { ...options, correction });
+      } catch (error) {
+        const child = await loadRecord(identity.run_id);
+        if (!child) {
+          delete lane.correction_follow;
+          bump(producer);
+          try {
+            await persist(producer);
+            await reservation.release();
+          } catch {
+            // Keep the fail-closed reservation rather than masking the original error.
+          }
+        }
+        throw error;
+      }
+    });
+  }
+
   async function inspectRun(request) {
     const parsed = ownObject(request, 'request');
     assertKeys(parsed, ['run_id'], 'request');
@@ -1972,6 +2123,7 @@ export function createRunAdmissionRuntime(overrides = {}) {
 
   return capturedFreeze({
     submitRunRequest,
+    submitOwnedRevision,
     inspectRun,
     resumeRun,
     replyRun,
diff --git a/plugins/codex-co-engineer/mcp/v3/run-coordination-response.mjs b/plugins/codex-co-engineer/mcp/v3/run-coordination-response.mjs
new file mode 100644
index 0000000..88d247e
--- /dev/null
+++ b/plugins/codex-co-engineer/mcp/v3/run-coordination-response.mjs
@@ -0,0 +1,328 @@
+// Compact machine-derived coordination packet for review and correction
+// handoffs. Candidate Git identity, existing evidence refs, unresolved work,
+// and the exact next action — not a reconstructed prompt or receipt.
+
+import {
+  capturedFreeze,
+  capturedIncludes,
+  capturedTest,
+} from './grammar.mjs';
+import { ownedCorrectionBudgetRemainingV1 } from './owned-delegation.mjs';
+import { freezeData } from './selection-json.mjs';
+
+export const RUN_COORDINATION_RESPONSE_SCHEMA_ID = 'codex-co-engineer.run-coordination-response.v1';
+export const RUN_COORDINATION_RESPONSE_VERSION = 1;
+
+const SHA40 = /^[0-9a-fA-F]{40}$/u;
+const DIGEST = /^(?:sha256:)?[0-9a-f]{64}$/u;
+const COMPLETED = capturedFreeze(['completed', 'succeeded']);
+const FAILED = capturedFreeze([
+  'failed', 'failed_pre_prompt', 'timeout', 'timed_out', 'cancelled',
+  'transport_lost', 'environment_blocked', 'unrecoverable_post_prompt',
+]);
+const ATTENTION = capturedFreeze(['needs_attention', 'awaiting_consent']);
+const ACTIVE = capturedFreeze([
+  'accepted', 'starting', 'running', 'cancelling', 'dispatching',
+  'preparing_workspaces', 'validating', 'prompt_dispatched', 'session_ready',
+  'prepared', 'planned',
+]);
+const NEXT_ACTIONS = capturedFreeze([
+  'wait', 'reply', 'revision', 'review', 'inspect', 'none', 'resubmit',
+]);
+
+function compactSha(value) {
+  return typeof value === 'string' && capturedTest(SHA40, value)
+    ? value.toLowerCase()
+    : null;
+}
+
+function compactDigest(value) {
+  if (typeof value !== 'string' || !capturedTest(DIGEST, value)) return null;
+  return value.startsWith('sha256:') ? value : `sha256:${value}`;
+}
+
+function laneStatus(lane) {
+  if (typeof lane?.status === 'string' && lane.status.length > 0) return lane.status;
+  if (typeof lane?.phase === 'string' && lane.phase.length > 0) return lane.phase;
+  return null;
+}
+
+function pushRef(refs, seen, entry) {
+  const digest = compactDigest(entry.digest);
+  if (digest === null) return;
+  const relativePath = typeof entry.relative_path === 'string' ? entry.relative_path : null;
+  const key = `${entry.kind}:${entry.assignment_id ?? ''}:${relativePath ?? ''}:${digest}`;
+  if (seen.has(key)) return;
+  seen.add(key);
+  refs.push(freezeData({
+    kind: entry.kind,
+    digest,
+    ...(typeof entry.assignment_id === 'string' ? { assignment_id: entry.assignment_id } : {}),
+    ...(typeof entry.artifact_kind === 'string' ? { artifact_kind: entry.artifact_kind } : {}),
+    ...(relativePath ? { relative_path: relativePath } : {}),
+  }));
+}
+
+function isRetrievableArtifactRef(ref) {
+  if (!ref || typeof ref !== 'object') return false;
+  const kind = typeof ref.artifact_kind === 'string' ? ref.artifact_kind : null;
+  const relativePath = typeof ref.relative_path === 'string' ? ref.relative_path : null;
+  const digest = compactDigest(ref.sha256 ?? ref.digest);
+  return kind !== null && relativePath !== null && digest !== null;
+}
+
+function collectEvidenceRefs(receipt) {
+  const refs = [];
+  const seen = new Set();
+  const lanes = Array.isArray(receipt?.lanes) ? receipt.lanes : [];
+  for (const lane of lanes) {
+    const assignmentId = typeof lane?.assignment_id === 'string' ? lane.assignment_id : undefined;
+    const extra = [
+      ...(Array.isArray(lane?.artifact_refs) ? lane.artifact_refs : []),
+      ...(Array.isArray(lane?.evidence_refs) ? lane.evidence_refs : []),
+    ];
+    for (const ref of extra.slice(0, 8)) {
+      if (!isRetrievableArtifactRef(ref)) continue;
+      pushRef(refs, seen, {
+        kind: 'artifact',
+        assignment_id: assignmentId,
+        digest: ref.sha256 ?? ref.digest,
+        artifact_kind: ref.artifact_kind,
+        relative_path: ref.relative_path,
+      });
+    }
+  }
+  const top = [
+    ...(Array.isArray(receipt?.artifact_refs) ? receipt.artifact_refs : []),
+    ...(Array.isArray(receipt?.evidence_refs) ? receipt.evidence_refs : []),
+  ];
+  for (const ref of top.slice(0, 8)) {
+    if (!isRetrievableArtifactRef(ref)) continue;
+    pushRef(refs, seen, {
+      kind: 'artifact',
+      digest: ref.sha256 ?? ref.digest,
+      assignment_id: typeof ref.assignment_id === 'string' ? ref.assignment_id : undefined,
+      artifact_kind: ref.artifact_kind,
+      relative_path: ref.relative_path,
+    });
+  }
+  return refs.slice(0, 16);
+}
+
+function laneClean(lane) {
+  if (typeof lane?.clean === 'boolean') return lane.clean;
+  if (typeof lane?.handoff?.clean === 'boolean') return lane.handoff.clean;
+  return null;
+}
+
+function laneCleanupIncomplete(lane, receipt) {
+  if (lane?.task_final === false && capturedIncludes(COMPLETED, laneStatus(lane))) return true;
+  if (lane?.status === 'lifecycle_pending' || lane?.phase === 'lifecycle_pending') return true;
+  const cleanup = receipt?.cleanup;
+  if (cleanup?.proof_bound === false) return true;
+  if (Array.isArray(cleanup?.unresolved) && cleanup.unresolved.length > 0) return true;
+  if (receipt?.blockers?.cleanup === true) return true;
+  return false;
+}
+
+function collectUnresolved(lanes, receipt) {
+  const unresolved = [];
+  for (const lane of lanes.slice(0, 8)) {
+    const status = laneStatus(lane);
+    const required = lane?.required !== false;
+    const clean = laneClean(lane);
+    let reason = null;
+    if (laneCleanupIncomplete(lane, receipt)) reason = 'cleanup';
+    else if (clean === false) reason = 'dirty';
+    else if (status === null) reason = 'unresolved';
+    else if (capturedIncludes(ATTENTION, status)) reason = 'needs_attention';
+    else if (capturedIncludes(FAILED, status)) reason = 'failed';
+    else if (capturedIncludes(ACTIVE, status)) reason = 'active';
+    else if (lane?.dispatch_confidence === 'uncertain' || lane?.dispatch_confidence === 'not_sent'
+      || lane?.dispatch_confidence === 'unknown') reason = 'uncertain';
+    else if (capturedIncludes(COMPLETED, status)) {
+      if (clean !== true || lane?.task_final !== true || lane?.dispatch_confidence !== 'authoritative' || lane?.prompt_dispatched !== true) {
+        reason = 'unresolved';
+      } else {
+        continue;
+      }
+    } else reason = 'unresolved';
+    unresolved.push(freezeData({
+      assignment_id: typeof lane?.assignment_id === 'string' ? lane.assignment_id : null,
+      status,
+      required,
+      reason,
+    }));
+  }
+  return unresolved;
+}
+
+function isProvenCompletedCleanWriter(lane) {
+  return capturedIncludes(COMPLETED, laneStatus(lane))
+    && (lane?.access === 'writer' || lane?.access === 'write' || lane?.role === 'implement')
+    && laneClean(lane) === true
+    && lane?.task_final === true
+    && lane?.dispatch_confidence === 'authoritative'
+    && lane?.prompt_dispatched === true;
+}
+
+function firstFollowRunId(lanes) {
+  for (const lane of lanes) {
+    const childRunId = lane?.correction_follow?.child_run_id;
+    if (typeof childRunId === 'string' && childRunId.length > 0) return childRunId;
+  }
+  return null;
+}
+
+function chooseNextAction(receipt, lanes, unresolved) {
+  const runId = typeof receipt?.run_id === 'string' ? receipt.run_id : null;
+  if (receipt?.persisted === false) {
+    return freezeData({
+      tool: 'delegate',
+      operation: 'submit',
+      run_id: null,
+      action: 'resubmit',
+    });
+  }
+  if (receipt?.attention?.status === 'open' || unresolved.some((item) => item.reason === 'needs_attention')) {
+    return freezeData({
+      tool: 'task',
+      operation: 'reply',
+      run_id: runId,
+      action: 'reply',
+    });
+  }
+  if (unresolved.some((item) => item.reason === 'active')) {
+    return freezeData({
+      tool: 'task',
+      operation: 'wait',
+      run_id: runId,
+      action: 'wait',
+    });
+  }
+  const failed = unresolved.find((item) => (
+    item.reason === 'failed'
+    || item.reason === 'dirty'
+    || item.reason === 'cleanup'
+    || item.reason === 'unresolved'
+    || item.reason === 'uncertain'
+  ));
+  if (failed) {
+    return freezeData({
+      tool: 'task',
+      operation: 'status',
+      run_id: runId,
+      assignment_id: failed.assignment_id,
+      action: 'inspect',
+    });
+  }
+  const followRunId = firstFollowRunId(lanes);
+  if (followRunId && unresolved.length === 0) {
+    return freezeData({
+      tool: 'task',
+      operation: 'status',
+      run_id: followRunId,
+      action: 'inspect',
+    });
+  }
+  if (unresolved.length === 0 && lanes.some((lane) => capturedIncludes(COMPLETED, laneStatus(lane)))) {
+    return freezeData({
+      tool: 'task',
+      operation: 'status',
+      run_id: runId,
+      action: 'review',
+    });
+  }
+  return freezeData({
+    tool: 'task',
+    operation: 'status',
+    run_id: runId,
+    action: 'none',
+  });
+}
+
+function collectProducers(receipt, lanes) {
+  const requestKey = compactDigest(receipt?.request_idempotency_key);
+  return lanes.slice(0, 8).map((lane) => freezeData({
+    assignment_id: typeof lane?.assignment_id === 'string' ? lane.assignment_id : null,
+    status: laneStatus(lane),
+    head: compactSha(lane?.head)
+      ?? compactSha(lane?.handoff?.current_head)
+      ?? compactSha(lane?.handoff?.head),
+    clean: laneClean(lane),
+    request_idempotency_key: compactDigest(lane?.request_idempotency_key) ?? requestKey,
+    role: typeof lane?.role === 'string' ? lane.role : null,
+    access: typeof lane?.access === 'string' ? lane.access : null,
+  }));
+}
+
+function collectAvailableActions(nextAction, lanes, unresolved, receipt) {
+  const actions = [];
+  if (typeof nextAction?.action === 'string' && capturedIncludes(NEXT_ACTIONS, nextAction.action)
+    && nextAction.action !== 'none') {
+    actions.push(nextAction.action);
+  }
+  const completedCleanWriter = unresolved.length === 0 && lanes.some(isProvenCompletedCleanWriter);
+  const followRunId = firstFollowRunId(lanes);
+  const budgetRemaining = ownedCorrectionBudgetRemainingV1(receipt?.correction);
+  if (completedCleanWriter && !followRunId && budgetRemaining && !actions.includes('revision')) {
+    actions.push('revision');
+  }
+  if (completedCleanWriter && !followRunId && !budgetRemaining && !actions.includes('resubmit')) {
+    actions.push('resubmit');
+  }
+  return actions;
+}
+
+export function projectRunCoordinationResponseV1(receipt) {
+  if (!receipt || typeof receipt !== 'object') {
+    return freezeData({
+      schema: RUN_COORDINATION_RESPONSE_SCHEMA_ID,
+      version: RUN_COORDINATION_RESPONSE_VERSION,
+      run_id: null,
+      persisted: false,
+      request_idempotency_key: null,
+      git: null,
+      producers: [],
+      evidence_refs: [],
+      unresolved: [],
+      next_action: freezeData({
+        tool: 'task',
+        operation: 'status',
+        run_id: null,
+        action: 'none',
+      }),
+      available_actions: [],
+    });
+  }
+  const lanes = Array.isArray(receipt.lanes) ? receipt.lanes : [];
+  const git = freezeData({
+    head: compactSha(receipt.git?.head) ?? compactSha(receipt.candidate?.head) ?? null,
+    base_sha: compactSha(receipt.git?.base_sha) ?? compactSha(receipt.base_sha),
+    digest: compactDigest(receipt.git?.digest),
+    clean: typeof receipt.candidate?.clean === 'boolean'
+      ? receipt.candidate.clean
+      : (typeof receipt.git?.clean === 'boolean' ? receipt.git.clean : null),
+  });
+  const unresolved = collectUnresolved(lanes, receipt);
+  const nextAction = chooseNextAction(receipt, lanes, unresolved);
+  return freezeData({
+    schema: RUN_COORDINATION_RESPONSE_SCHEMA_ID,
+    version: RUN_COORDINATION_RESPONSE_VERSION,
+    run_id: receipt.persisted === false
+      ? null
+      : (typeof receipt.run_id === 'string' ? receipt.run_id : null),
+    persisted: receipt.persisted !== false,
+    request_idempotency_key: compactDigest(receipt.request_idempotency_key),
+    git,
+    producers: collectProducers(receipt, lanes),
+    evidence_refs: collectEvidenceRefs(receipt),
+    unresolved,
+    next_action: nextAction,
+    available_actions: collectAvailableActions(nextAction, lanes, unresolved, receipt),
+  });
+}
+
+capturedFreeze(projectRunCoordinationResponseV1);
+capturedFreeze(firstFollowRunId);
+capturedFreeze(NEXT_ACTIONS);
diff --git a/plugins/codex-co-engineer/mcp/v3/run-request-compiler.mjs b/plugins/codex-co-engineer/mcp/v3/run-request-compiler.mjs
index a40c9dd..5633312 100644
--- a/plugins/codex-co-engineer/mcp/v3/run-request-compiler.mjs
+++ b/plugins/codex-co-engineer/mcp/v3/run-request-compiler.mjs
@@ -54,6 +54,10 @@ import {
   isAssignmentId,
 } from './run-manifest.mjs';
 import { parseRunManifestV1 } from './run-policy.mjs';
+import {
+  parseDelegationPreferencesV1,
+  resolveAssignmentPreferenceV1,
+} from './delegation-preferences.mjs';
 import {
   assertDirectJsonClosure,
   assertNotProxy,
@@ -70,7 +74,7 @@ const REALPATH = nodeRealpath;
 export const RUN_REQUEST_SCHEMA_ID = 'codex-co-engineer.run-request.v1';
 export const RUN_REQUEST_VERSION = 1;
 export const RUN_REQUEST_ALLOWED_KEYS = capturedFreeze([
-  'run_id', 'repo', 'objective', 'base_sha', 'assignments',
+  'run_id', 'repo', 'objective', 'base_sha', 'assignments', 'preferences',
 ]);
 export const RUN_REQUEST_ASSIGNMENT_ALLOWED_KEYS = capturedFreeze([
   'assignment_id', 'provider', 'model', 'role', 'access', 'prompt',
@@ -245,21 +249,26 @@ function assertAssignmentShape(value, index) {
   rejectUnknownKeys(value, ASSIGNMENT_KEY_SET, field);
 }
 
-function normalizeAssignment(value, index, baseSha) {
+function normalizeAssignment(value, index, baseSha, preferences) {
   const field = `run_request.assignments[${index}]`;
   assertAssignmentShape(value, index);
   const assignmentId = readRequired(value, 'assignment_id', `${field}.assignment_id`);
   if (typeof assignmentId !== 'string' || !isAssignmentId(assignmentId)) {
     compilerError('invalid_format', `${field}.assignment_id`, 'assignment_id is not valid.');
   }
-  const provider = readRequired(value, 'provider', `${field}.provider`);
-  if (typeof provider !== 'string' || !isKnownProvider(provider)) {
-    compilerError('unknown_provider', `${field}.provider`, `provider must be one of ${knownProvidersJoined()}.`);
-  }
   const role = readRequired(value, 'role', `${field}.role`);
   if (typeof role !== 'string' || !isKnownRole(role)) {
     compilerError('unknown_role', `${field}.role`, 'role must be implement, review, or verify.');
   }
+  const selection = resolveAssignmentPreferenceV1({
+    role,
+    provider: readOptional(value, 'provider', `${field}.provider`),
+    model: readOptional(value, 'model', `${field}.model`),
+  }, preferences, field);
+  const provider = selection.provider;
+  if (typeof provider !== 'string' || !isKnownProvider(provider)) {
+    compilerError('unknown_provider', `${field}.provider`, `provider must be one of ${knownProvidersJoined()}.`);
+  }
   const requestedAccess = readOptional(value, 'access', `${field}.access`);
   const access = requestedAccess === undefined
     ? requiredAccessForRole(role)
@@ -285,7 +294,7 @@ function normalizeAssignment(value, index, baseSha) {
   }
   const model = normalizeModel(
     provider,
-    readOptional(value, 'model', `${field}.model`),
+    selection.model,
     `${field}.model`,
   );
   const requestedScope = readOptional(value, 'write_scope', `${field}.write_scope`);
@@ -310,6 +319,7 @@ function normalizeAssignment(value, index, baseSha) {
     required: required ?? true,
     provider,
     model,
+    selection_source: selection.source,
     ...(requestedScope !== undefined ? { requested_write_scope: [...requestedScope] } : {}),
     capabilities,
     ...(startingRef !== undefined ? { starting_ref: startingRef } : {}),
@@ -474,6 +484,7 @@ function makePublicSummary(compiled) {
       task_id: assignment.task_id,
       provider: assignment.provider,
       model: assignment.model,
+      selection_source: assignment.selection_source,
       role: assignment.role,
       access: assignment.access,
       required: assignment.required,
@@ -506,6 +517,10 @@ export async function compileRunRequestV1(request, options = {}) {
     label: 'run_request.objective',
   });
   const requestedBaseSha = normalizeBaseSha(readOptional(request, 'base_sha', 'run_request.base_sha'));
+  const preferences = parseDelegationPreferencesV1(
+    readOptional(request, 'preferences', 'run_request.preferences'),
+    'run_request.preferences',
+  );
   const rawAssignments = readRequired(request, 'assignments', 'run_request.assignments');
   assertArray(rawAssignments, 'run_request.assignments', MIN_ASSIGNMENTS, MAX_ASSIGNMENTS);
   const observed = typeof options.observeGit === 'function'
@@ -542,7 +557,7 @@ export async function compileRunRequestV1(request, options = {}) {
   const normalized = [];
   const seenIds = new Set();
   for (let index = 0; index < rawAssignments.length; index += 1) {
-    const assignment = normalizeAssignment(rawAssignments[index], index, git.base_sha);
+    const assignment = normalizeAssignment(rawAssignments[index], index, git.base_sha, preferences);
     if (seenIds.has(assignment.assignment_id)) {
       compilerError('duplicate_assignment_id', `run_request.assignments[${index}].assignment_id`, 'Assignment IDs must be unique.');
     }
@@ -621,6 +636,7 @@ export async function compileRunRequestV1(request, options = {}) {
       task_id: taskIdFor(runId, assignment.assignment_id, provisionalRequestKey),
       provider: assignment.provider,
       model: assignment.model,
+      selection_source: assignment.selection_source,
       role: assignment.role,
       access: assignment.access,
       required: assignment.required,
diff --git a/plugins/codex-co-engineer/mcp/v3/run-result-evidence.mjs b/plugins/codex-co-engineer/mcp/v3/run-result-evidence.mjs
new file mode 100644
index 0000000..50fc628
--- /dev/null
+++ b/plugins/codex-co-engineer/mcp/v3/run-result-evidence.mjs
@@ -0,0 +1,726 @@
+// RunResultEvidenceV1 — bounded shareable projection of simple run-admission
+// receipts onto existing usage-ledger and local-outcome components.
+//
+// The admission adapter calls this projection on its measured receipt facts.
+// This module is not an MCP tool,
+// does not scrape private Codex state, and does not dump a usage ledger
+// into every wait. Summary is the default; detail is on-demand.
+//
+// Completed provider work is not Codex acceptance. Provider PASS is not
+// promoted. Missing native/provider tokens and subscription balances stay
+// unknown. Bytes stay labeled as bytes. Savings are never inferred.
+
+import { Buffer as NodeBuffer } from 'node:buffer';
+
+import {
+  compareArtifactRefsV1,
+  parseArtifactRefV1,
+} from './artifact-ref.mjs';
+import {
+  LOCAL_OUTCOME_SCHEMA_ID,
+  LOCAL_OUTCOME_VERSION,
+  PUBLIC_LABEL_ACCEPTED,
+  PUBLIC_LABEL_FAILED,
+  PUBLIC_LABEL_IN_PROGRESS,
+  PUBLIC_LABEL_REVIEW_NEEDED,
+  PUBLIC_LABEL_UNRESOLVED,
+  TRUNCATION_KEYS,
+  projectLocalOutcomeCardV1,
+  rollupAssignmentResult,
+} from './final-decision-card.mjs';
+import {
+  capturedFreeze,
+  capturedHasOwn,
+  capturedIncludes,
+  capturedIsArray,
+  capturedOwnKeys,
+  capturedTest,
+  capturedUtf8ByteLength,
+  isKnownProvider,
+  isKnownRole,
+} from './grammar.mjs';
+import { canonicalJsonStringify } from './identity.mjs';
+import {
+  MAX_ASSIGNMENTS,
+  MIN_ASSIGNMENTS,
+  assertRunId,
+  isAssignmentId,
+  isSha40,
+} from './run-manifest.mjs';
+import {
+  assertDirectJsonClosure,
+  assertNotProxy,
+  fail,
+  freezeData,
+  hasOwn,
+} from './selection-json.mjs';
+import {
+  MAX_USAGE_DETAIL_BYTES,
+  MAX_USAGE_SUMMARY_BYTES,
+  MAX_USAGE_SUMMARY_TEXT_BYTES,
+  USAGE_REPORT_TRUNCATION_REASON,
+  projectUsageReportV1,
+  unknownUsageReportV1,
+  validateUsageLedgerV1,
+} from './usage-ledger.mjs';
+
+export const RUN_RESULT_EVIDENCE_SCHEMA_ID = 'codex-co-engineer.run-result-evidence.v1';
+export const RUN_RESULT_EVIDENCE_VERSION = 1;
+export const RUN_ADMISSION_RECEIPT_SCHEMA_ID = 'codex-co-engineer.run-admission.v1';
+export const RUN_RESULT_EVIDENCE_VIEWS = capturedFreeze(['detail', 'summary']);
+export const RUN_RESULT_EVIDENCE_API = capturedFreeze([
+  'describeRunResultEvidenceV1',
+  'detailRunResultEvidenceV1',
+  'projectRunResultEvidenceV1',
+  'summarizeRunResultEvidenceV1',
+]);
+export const MAX_RUN_RESULT_SUMMARY_BYTES = 2048;
+export const MAX_RUN_RESULT_DETAIL_BYTES = 16_384;
+export const MAX_RUN_RESULT_TEXT_BYTES = 512;
+export const MAX_SHAREABLE_STRING_BYTES = 128;
+export const WRAPPER_KEYS = capturedFreeze([
+  'artifacts', 'candidate', 'checks', 'codex_acceptance', 'receipt', 'usage_ledger',
+]);
+export const SUMMARY_RESULT_KEYS = capturedFreeze([
+  'assignment_result', 'candidate', 'codex_accepted', 'label', 'next_decision',
+  'review_needed', 'run_id', 'schema', 'text', 'truncation', 'unresolved',
+  'usage', 'version', 'view',
+]);
+export const DETAIL_RESULT_KEYS = capturedFreeze([
+  ...SUMMARY_RESULT_KEYS, 'artifacts', 'assignments', 'checks',
+]);
+export const RUN_RESULT_REPORT_TRUNCATION_REASON = USAGE_REPORT_TRUNCATION_REASON;
+
+const BRANCH_PATTERN = /^[A-Za-z0-9][A-Za-z0-9._-]{0,63}(?:\/[A-Za-z0-9][A-Za-z0-9._-]{0,63}){0,7}$/u;
+const CHECK_ID_PATTERN = /^[A-Za-z0-9][A-Za-z0-9._-]{0,63}$/u;
+const ABSOLUTE_PATH_PATTERN = /^(?:\/|~\/|[A-Za-z]:[\\/])/u;
+const FAILED_OUTCOMES = capturedFreeze([
+  'blocked', 'cancelled', 'environment_blocked', 'failed', 'failed_pre_prompt',
+  'timeout', 'timed_out', 'transport_lost', 'unrecoverable_post_prompt',
+]);
+const UNCERTAIN_OUTCOMES = capturedFreeze([
+  'degraded', 'lifecycle_pending', 'needs_attention', 'partial_handoff',
+  'unknown', 'unresolved',
+]);
+const UNFINAL_OUTCOMES = capturedFreeze([
+  'accepted', 'awaiting_consent', 'dispatching', 'dispatched', 'planned',
+  'prepared', 'preparing_workspaces', 'prompt_dispatched', 'running',
+  'session_ready', 'starting', 'validating', 'verifying',
+]);
+const DEFINE = Object.defineProperty;
+const STRING = String;
+const BYTE_LENGTH = NodeBuffer.byteLength.bind(NodeBuffer);
+
+function deny(code, pathLabel, message) {
+  fail(code, pathLabel, message ?? `RunResultEvidenceV1 rejected ${pathLabel}.`);
+}
+
+function freezeRecord(keys, values) {
+  const snapshot = {};
+  for (let i = 0; i < keys.length; i += 1) {
+    const key = keys[i];
+    if (!capturedHasOwn(values, key)) continue;
+    DEFINE(snapshot, key, {
+      value: values[key], enumerable: true, writable: false, configurable: false,
+    });
+  }
+  return capturedFreeze(snapshot);
+}
+
+function freezeList(values) {
+  const copy = [];
+  for (let i = 0; i < values.length; i += 1) copy[i] = values[i];
+  return capturedFreeze(copy);
+}
+
+function clipText(text, maxBytes) {
+  if (capturedUtf8ByteLength(text) <= maxBytes) return text;
+  const encoded = NodeBuffer.from(text, 'utf8');
+  let end = maxBytes - 3;
+  while (end > 0 && (encoded[end] & 0xc0) === 0x80) end -= 1;
+  return `${encoded.subarray(0, end).toString('utf8')}…`;
+}
+
+function isShareableString(value, maxBytes = MAX_SHAREABLE_STRING_BYTES) {
+  if (typeof value !== 'string' || value.length === 0) return false;
+  if (BYTE_LENGTH(value, 'utf8') > maxBytes) return false;
+  if (capturedTest(ABSOLUTE_PATH_PATTERN, value)) return false;
+  if (value.includes('\\') || value.includes('\0')) return false;
+  return true;
+}
+
+function ownPlain(value, pathLabel) {
+  if (value === undefined || value === null) deny('invalid_type', pathLabel);
+  assertNotProxy(value, pathLabel);
+  if (typeof value !== 'object' || capturedIsArray(value)) deny('invalid_type', pathLabel);
+  assertDirectJsonClosure(value, pathLabel);
+  return value;
+}
+
+function laneToken(lane) {
+  const status = typeof lane.status === 'string' ? lane.status : null;
+  const phase = typeof lane.phase === 'string' ? lane.phase : null;
+  return status ?? phase;
+}
+
+function cleanProof(value) {
+  if (value === false) return 'dirty';
+  if (value === true) return 'clean';
+  return 'unknown';
+}
+
+function laneCleanliness(lane) {
+  const laneProof = cleanProof(lane.clean);
+  const handoff = lane.handoff;
+  const handoffProof = handoff && typeof handoff === 'object' && !capturedIsArray(handoff)
+    ? cleanProof(handoff.clean)
+    : 'unknown';
+  if (laneProof === 'dirty' || handoffProof === 'dirty') return 'dirty';
+  if (laneProof === 'clean' || handoffProof === 'clean') return 'clean';
+  return 'unknown';
+}
+
+function mapLaneOutcome(lane) {
+  const token = laneToken(lane);
+  const confidence = typeof lane.dispatch_confidence === 'string' ? lane.dispatch_confidence : null;
+  if (capturedIncludes(FAILED_OUTCOMES, token)) {
+    return token === 'cancelled' ? 'cancelled' : 'failed';
+  }
+  if (capturedIncludes(UNFINAL_OUTCOMES, token)) return 'unfinal';
+  if (token === 'lifecycle_pending') return 'uncertain';
+  if (lane.task_final === false) return 'uncertain';
+  const cleanliness = laneCleanliness(lane);
+  if (cleanliness === 'dirty') return 'uncertain';
+  if (confidence === 'uncertain' || confidence === 'unknown') return 'uncertain';
+  if (token === 'completed') {
+    return confidence === 'authoritative' && lane.prompt_dispatched === true && lane.task_final === true
+      && cleanliness === 'clean'
+      ? 'completed' : 'uncertain';
+  }
+  if (capturedIncludes(UNCERTAIN_OUTCOMES, token)) return 'uncertain';
+  return 'uncertain';
+}
+
+function mapRunOutcome(phase) {
+  if (phase === 'completed') return 'completed';
+  if (phase === 'failed') return 'failed';
+  if (phase === 'cancelled') return 'cancelled';
+  if (capturedIncludes(FAILED_OUTCOMES, phase)) {
+    return phase === 'cancelled' ? 'cancelled' : 'failed';
+  }
+  if (capturedIncludes(UNFINAL_OUTCOMES, phase)) return 'unfinal';
+  if (capturedIncludes(UNCERTAIN_OUTCOMES, phase)) return 'uncertain';
+  return 'uncertain';
+}
+
+function resultLabel(result, accepted, reviewNeeded) {
+  if (accepted === true && result === 'completed') return PUBLIC_LABEL_ACCEPTED;
+  if (result === 'failed' || result === 'cancelled') return PUBLIC_LABEL_FAILED;
+  if (result === 'unfinal') return PUBLIC_LABEL_IN_PROGRESS;
+  if (result === 'uncertain') return PUBLIC_LABEL_UNRESOLVED;
+  if (reviewNeeded === true) return PUBLIC_LABEL_REVIEW_NEEDED;
+  return PUBLIC_LABEL_REVIEW_NEEDED;
+}
+
+function resultNextDecision(result, reviewNeeded) {
+  if (result === 'unfinal') return 'wait_for_completion';
+  if (result === 'failed' || result === 'cancelled') return 'resolve_failures';
+  if (result === 'uncertain') return 'inspect_unresolved';
+  if (reviewNeeded === true) return 'review_candidate';
+  return 'none';
+}
+
+function readSha(value) {
+  return typeof value === 'string' && isSha40(value) ? value : null;
+}
+
+function readBranch(value) {
+  return typeof value === 'string' && capturedTest(BRANCH_PATTERN, value) && isShareableString(value, 200)
+    ? value
+    : null;
+}
+
+function sanitizeArtifact(value, runId, assignmentIds) {
+  let snapshot;
+  try {
+    snapshot = parseArtifactRefV1(value, 'artifact_ref');
+  } catch {
+    return null;
+  }
+  if (snapshot.run_id !== runId) return null;
+  if (!assignmentIds.has(snapshot.assignment_id)) return null;
+  if (snapshot.artifact_class !== 'sanitized') return null;
+  return snapshot;
+}
+
+function parseWrapper(source) {
+  const object = ownPlain(source, 'source');
+  const keys = capturedOwnKeys(object);
+  for (let i = 0; i < keys.length; i += 1) {
+    if (!capturedIncludes(WRAPPER_KEYS, keys[i])) deny('unknown_key', `source.${STRING(keys[i])}`);
+  }
+  if (!hasOwn(object, 'receipt')) deny('missing_key', 'source.receipt');
+  return object;
+}
+
+function asReceipt(source) {
+  const object = ownPlain(source, 'source');
+  if (object.schema === RUN_ADMISSION_RECEIPT_SCHEMA_ID) return { receipt: object };
+  return parseWrapper(object);
+}
+
+function parseLane(raw, index) {
+  if (raw === null || typeof raw !== 'object' || capturedIsArray(raw)) return null;
+  try { assertNotProxy(raw, `lanes[${index}]`); } catch { return null; }
+  const assignmentId = raw.assignment_id;
+  const provider = raw.provider;
+  const role = raw.role;
+  if (!isAssignmentId(assignmentId) || !isKnownProvider(provider) || !isKnownRole(role)) {
+    return null;
+  }
+  return {
+    assignment_id: assignmentId,
+    provider,
+    role,
+    required: raw.required !== false,
+    outcome: mapLaneOutcome(raw),
+    head: readSha(raw.head),
+    artifact_refs: capturedIsArray(raw.artifact_refs) ? raw.artifact_refs : [],
+  };
+}
+
+function selectCandidate(lanes, override) {
+  if (override && typeof override === 'object') {
+    const head = readSha(override.head);
+    const tree = readSha(override.tree);
+    const composed = override.composed === true && head != null;
+    if (lanes.length > 1 && composed !== true) {
+      return {
+        branch: null,
+        head: null,
+        tree: null,
+        composed: false,
+      };
+    }
+    return {
+      branch: readBranch(override.branch),
+      head,
+      tree,
+      composed,
+    };
+  }
+  if (lanes.length === 1) {
+    return {
+      branch: null,
+      head: lanes[0].head,
+      tree: null,
+      composed: false,
+    };
+  }
+  return {
+    branch: null,
+    head: null,
+    tree: null,
+    composed: false,
+  };
+}
+
+function deriveChecks(override) {
+  if (!capturedIsArray(override)) return [];
+  const checks = [];
+  for (let i = 0; i < override.length && checks.length < 8; i += 1) {
+    const row = override[i];
+    if (row == null || typeof row !== 'object') continue;
+    if (typeof row.id !== 'string' || !capturedTest(CHECK_ID_PATTERN, row.id)) continue;
+    const status = row.status;
+    if (status !== 'passed' && status !== 'failed' && status !== 'unknown'
+      && status !== 'provider_pass' && status !== 'missing') continue;
+    checks.push({
+      id: row.id,
+      present: row.present === true,
+      status,
+    });
+  }
+  return checks;
+}
+
+function collectArtifacts(runId, lanes, override) {
+  const assignmentIds = new Set();
+  for (let i = 0; i < lanes.length; i += 1) assignmentIds.add(lanes[i].assignment_id);
+  const collected = [];
+  const source = capturedIsArray(override) ? override : [];
+  if (!capturedIsArray(override)) {
+    for (let i = 0; i < lanes.length; i += 1) {
+      for (let j = 0; j < lanes[i].artifact_refs.length; j += 1) {
+        source.push(lanes[i].artifact_refs[j]);
+      }
+    }
+  }
+  for (let i = 0; i < source.length; i += 1) {
+    const artifact = sanitizeArtifact(source[i], runId, assignmentIds);
+    if (artifact) collected.push(artifact);
+  }
+  collected.sort((left, right) => compareArtifactRefsV1(left, right));
+  const unique = [];
+  for (let i = 0; i < collected.length; i += 1) {
+    if (i > 0 && compareArtifactRefsV1(collected[i - 1], collected[i]) === 0) continue;
+    unique.push(collected[i]);
+  }
+  return unique;
+}
+
+function projectUsage(value, view, maxBytes) {
+  if (value == null) return unknownUsageReportV1(view);
+  validateUsageLedgerV1(value);
+  return projectUsageReportV1(value, { view, max_bytes: maxBytes });
+}
+
+function compactText(assignmentResult, accepted, reviewNeeded, usage) {
+  const usageText = usage.present === true
+    ? usage.text
+    : 'No usage recorded. Native token balance is unknown.';
+  let lead = 'Completed work needs review; it is not Codex-accepted.';
+  if (accepted === true && assignmentResult === 'completed') {
+    lead = 'Codex accepted this completed candidate.';
+  } else if (assignmentResult === 'failed') {
+    lead = 'The run failed; resolve the failures.';
+  } else if (assignmentResult === 'cancelled') {
+    lead = 'The run was cancelled; resolve the failures.';
+  } else if (assignmentResult === 'unfinal') {
+    lead = 'Work is still in progress; wait for completion.';
+  } else if (assignmentResult === 'uncertain') {
+    lead = 'The outcome is unresolved; inspect before deciding.';
+  } else if (reviewNeeded !== true) {
+    lead = 'Completed work is not Codex-accepted.';
+  }
+  return clipText(`${lead} ${usageText}`, MAX_RUN_RESULT_TEXT_BYTES);
+}
+
+function emptyTruncation(count) {
+  return freezeRecord(TRUNCATION_KEYS, {
+    truncated: false,
+    fields: freezeList([]),
+    original_count: count,
+    retained: count,
+    omitted: 0,
+    reason: null,
+  });
+}
+
+function reportTruncation(fields, originalCount, retained) {
+  return freezeRecord(TRUNCATION_KEYS, {
+    truncated: true,
+    fields: freezeList(fields),
+    original_count: originalCount,
+    retained,
+    omitted: originalCount > retained ? originalCount - retained : 0,
+    reason: RUN_RESULT_REPORT_TRUNCATION_REASON,
+  });
+}
+
+function recordBytes(record) {
+  return BYTE_LENGTH(canonicalJsonStringify(record), 'utf8');
+}
+
+function mergeTruncation(base, extraFields, originalCount, retained) {
+  const fields = [];
+  const fromBase = base && capturedIsArray(base.fields) ? base.fields : [];
+  for (let i = 0; i < fromBase.length; i += 1) fields.push(fromBase[i]);
+  for (let i = 0; i < extraFields.length; i += 1) {
+    if (!capturedIncludes(fields, extraFields[i])) fields.push(extraFields[i]);
+  }
+  const truncated = (base && base.truncated === true) || extraFields.length > 0;
+  if (!truncated) {
+    return base ?? emptyTruncation(originalCount);
+  }
+  return reportTruncation(
+    fields,
+    originalCount,
+    retained,
+  );
+}
+
+function fitRunResult(record, maxBytes, pathLabel) {
+  const originalCount = (
+    (capturedIsArray(record.assignments) ? record.assignments.length : 0)
+    + (capturedIsArray(record.artifacts) ? record.artifacts.length : 0)
+    + (capturedIsArray(record.checks) ? record.checks.length : 0)
+    + (record.usage && capturedIsArray(record.usage.metrics) ? record.usage.metrics.length : 0)
+  );
+  if (recordBytes(record) <= maxBytes) return freezeData(record);
+  const fields = [];
+  let current = { ...record };
+  const clipTo = (limit) => {
+    const next = clipText(current.text, limit);
+    if (next !== current.text) {
+      if (!capturedIncludes(fields, 'text')) fields.push('text');
+      current = { ...current, text: next };
+    }
+  };
+  clipTo(240);
+  if (current.candidate && current.candidate.branch != null) {
+    fields.push('candidate');
+    current = {
+      ...current,
+      candidate: {
+        branch: null,
+        head: current.candidate.head,
+        tree: current.candidate.tree,
+        composed: current.candidate.composed === true,
+      },
+    };
+  }
+  const applyTruncation = (retained) => ({
+    ...current,
+    truncation: mergeTruncation(current.truncation, fields, originalCount, retained),
+  });
+  if (recordBytes(applyTruncation(originalCount)) <= maxBytes) {
+    return freezeData(applyTruncation(originalCount));
+  }
+  if (current.usage && capturedIsArray(current.usage.groups) && current.usage.groups.length > 0) {
+    fields.push('usage');
+    current = { ...current, usage: { ...current.usage, groups: [] } };
+  }
+  if (capturedIsArray(current.artifacts) && current.artifacts.length > 0) {
+    fields.push('artifacts');
+    current = { ...current, artifacts: [] };
+  }
+  if (recordBytes(applyTruncation(originalCount)) <= maxBytes) {
+    return freezeData(applyTruncation(originalCount));
+  }
+  if (current.usage && capturedIsArray(current.usage.metrics) && current.usage.metrics.length > 0) {
+    if (!capturedIncludes(fields, 'usage')) fields.push('usage');
+    current = {
+      ...current,
+      usage: {
+        ...current.usage,
+        metrics: [],
+        text: clipText(
+          current.usage.present === true
+            ? 'Usage recorded; retrieve detail. Native token balance is unknown. Savings are not inferred.'
+            : current.usage.text,
+          160,
+        ),
+      },
+    };
+  }
+  clipTo(160);
+  if (recordBytes(applyTruncation(
+    (capturedIsArray(current.assignments) ? current.assignments.length : 0)
+    + (capturedIsArray(current.checks) ? current.checks.length : 0),
+  )) <= maxBytes) {
+    return freezeData(applyTruncation(
+      (capturedIsArray(current.assignments) ? current.assignments.length : 0)
+      + (capturedIsArray(current.checks) ? current.checks.length : 0),
+    ));
+  }
+  if (capturedIsArray(current.assignments) && current.assignments.length > 0) {
+    fields.push('assignments');
+    const kept = [];
+    for (let i = 0; i < current.assignments.length; i += 1) {
+      kept.push({
+        assignment_id: current.assignments[i].assignment_id,
+        provider: current.assignments[i].provider,
+        role: current.assignments[i].role,
+        required: current.assignments[i].required,
+        outcome: current.assignments[i].outcome,
+        head: current.assignments[i].head ?? null,
+      });
+    }
+    current = { ...current, assignments: kept };
+  }
+  if (capturedIsArray(current.checks) && current.checks.length > 0) {
+    fields.push('checks');
+    current = { ...current, checks: [] };
+  }
+  const retained = capturedIsArray(current.assignments) ? current.assignments.length : 0;
+  const fitted = applyTruncation(retained);
+  if (recordBytes(fitted) <= maxBytes) return freezeData(fitted);
+  const minimal = {
+    schema: current.schema,
+    version: current.version,
+    view: current.view,
+    run_id: current.run_id,
+    assignment_result: current.assignment_result,
+    codex_accepted: current.codex_accepted,
+    review_needed: current.review_needed,
+    unresolved: current.unresolved,
+    next_decision: current.next_decision,
+    label: current.label,
+    candidate: {
+      branch: null,
+      head: current.candidate?.head ?? null,
+      tree: current.candidate?.tree ?? null,
+      composed: current.candidate?.composed === true,
+    },
+    usage: current.usage
+      ? {
+        schema: current.usage.schema,
+        view: current.usage.view,
+        present: current.usage.present,
+        identities: current.usage.identities,
+        observations: current.usage.observations,
+        metrics: [],
+        unknown: current.usage.unknown,
+        savings: current.usage.savings,
+        subscription: current.usage.subscription,
+        token_totals: current.usage.token_totals,
+        text: clipText('Usage truncated; retrieve detail.', 64),
+        truncation: current.usage.truncation ?? emptyTruncation(0),
+      }
+      : current.usage,
+    text: clipText(
+      compactText(
+        current.assignment_result,
+        current.codex_accepted,
+        current.review_needed,
+        { present: false, text: '' },
+      ),
+      160,
+    ),
+    truncation: reportTruncation(
+      ['text', 'usage', 'assignments', 'artifacts', 'checks', 'candidate'],
+      originalCount,
+      0,
+    ),
+  };
+  if (current.view === 'detail') {
+    minimal.assignments = capturedIsArray(current.assignments)
+      ? current.assignments.map((row) => ({
+        assignment_id: row.assignment_id,
+        outcome: row.outcome,
+        required: row.required,
+        provider: row.provider,
+        role: row.role,
+        head: row.head ?? null,
+      }))
+      : [];
+    minimal.checks = [];
+    minimal.artifacts = [];
+  }
+  if (recordBytes(minimal) <= maxBytes) return freezeData(minimal);
+  deny('out_of_range', pathLabel, `Run result ${record.view} exceeds ${maxBytes} bytes.`);
+  return freezeData(minimal);
+}
+
+export function describeRunResultEvidenceV1() {
+  return freezeData(capturedFreeze({
+    schema: RUN_RESULT_EVIDENCE_SCHEMA_ID,
+    version: RUN_RESULT_EVIDENCE_VERSION,
+    api: RUN_RESULT_EVIDENCE_API,
+    views: RUN_RESULT_EVIDENCE_VIEWS,
+    default_view: 'summary',
+    max_summary_bytes: MAX_RUN_RESULT_SUMMARY_BYTES,
+    max_detail_bytes: MAX_RUN_RESULT_DETAIL_BYTES,
+    max_usage_summary_bytes: MAX_USAGE_SUMMARY_BYTES,
+    max_usage_summary_text_bytes: MAX_USAGE_SUMMARY_TEXT_BYTES,
+    max_usage_detail_bytes: MAX_USAGE_DETAIL_BYTES,
+    savings: 'not_inferred',
+    subscription: 'unknown',
+    completed_is_not_accepted: true,
+    provider_pass_is_not_acceptance: true,
+  }));
+}
+
+export function projectRunResultEvidenceV1(source, options) {
+  const view = options?.view == null ? 'summary' : options.view;
+  if (!capturedIncludes(RUN_RESULT_EVIDENCE_VIEWS, view)) {
+    deny('invalid_format', 'options.view');
+  }
+  const wrapped = asReceipt(source);
+  const receipt = ownPlain(wrapped.receipt, 'receipt');
+  if (receipt.schema !== RUN_ADMISSION_RECEIPT_SCHEMA_ID) {
+    deny('invalid_format', 'receipt.schema');
+  }
+  const runId = receipt.run_id;
+  try { assertRunId(runId, 'receipt.run_id'); } catch { deny('invalid_format', 'receipt.run_id'); }
+  const phase = typeof receipt.phase === 'string' ? receipt.phase : STRING(receipt.status ?? '');
+  const rawLanes = capturedIsArray(receipt.lanes) ? receipt.lanes : [];
+  if (rawLanes.length < MIN_ASSIGNMENTS || rawLanes.length > MAX_ASSIGNMENTS) {
+    deny('bounds_exceeded', 'receipt.lanes');
+  }
+  const lanes = [];
+  for (let i = 0; i < rawLanes.length; i += 1) {
+    const lane = parseLane(rawLanes[i], i);
+    if (lane == null) deny('invalid_format', `receipt.lanes[${i}]`);
+    lanes.push(lane);
+  }
+  const candidate = selectCandidate(lanes, wrapped.candidate);
+  const checks = deriveChecks(wrapped.checks);
+  const artifacts = collectArtifacts(runId, lanes, wrapped.artifacts);
+  const usageBudget = view === 'detail' ? MAX_USAGE_DETAIL_BYTES : 1_280;
+  const usage = projectUsage(wrapped.usage_ledger ?? receipt.usage_ledger, view, usageBudget);
+  const baseSha = readSha(receipt.base_sha) ?? readSha(receipt.git?.base_sha);
+  if (baseSha == null) deny('missing_key', 'receipt.base_sha');
+  const outcome = projectLocalOutcomeCardV1({
+    schema: LOCAL_OUTCOME_SCHEMA_ID,
+    version: LOCAL_OUTCOME_VERSION,
+    identity: {
+      run_id: runId,
+      base_sha: baseSha,
+    },
+    candidate,
+    assignments: lanes.map((lane) => ({
+      assignment_id: lane.assignment_id,
+      provider: lane.provider,
+      role: lane.role,
+      required: lane.required,
+      outcome: lane.outcome,
+      head: lane.head,
+    })),
+    checks,
+    artifacts,
+    ...(hasOwn(wrapped, 'codex_acceptance') ? { codex_acceptance: wrapped.codex_acceptance } : {}),
+  });
+  const runOutcome = mapRunOutcome(phase);
+  const assignmentResult = rollupAssignmentResult(lanes, runOutcome);
+  const unresolved = assignmentResult === 'unfinal' || assignmentResult === 'uncertain';
+  const reviewNeeded = outcome.codex_accepted !== true && assignmentResult === 'completed';
+  const nextDecision = resultNextDecision(assignmentResult, reviewNeeded);
+  const label = resultLabel(assignmentResult, outcome.codex_accepted === true, reviewNeeded);
+  const truncation = outcome.truncation ?? emptyTruncation(artifacts.length);
+  const summary = freezeRecord(SUMMARY_RESULT_KEYS, {
+    schema: RUN_RESULT_EVIDENCE_SCHEMA_ID,
+    version: RUN_RESULT_EVIDENCE_VERSION,
+    view,
+    run_id: runId,
+    assignment_result: assignmentResult,
+    codex_accepted: outcome.codex_accepted === true && assignmentResult === 'completed',
+    review_needed: reviewNeeded,
+    unresolved,
+    next_decision: nextDecision,
+    label,
+    candidate: outcome.candidate,
+    usage,
+    text: compactText(
+      assignmentResult,
+      outcome.codex_accepted === true && assignmentResult === 'completed',
+      reviewNeeded,
+      usage,
+    ),
+    truncation,
+  });
+  if (view === 'summary') {
+    return fitRunResult(summary, MAX_RUN_RESULT_SUMMARY_BYTES, 'run_result_summary');
+  }
+  const detail = freezeRecord(DETAIL_RESULT_KEYS, {
+    ...summary,
+    assignments: outcome.assignments,
+    checks: outcome.checks,
+    artifacts: outcome.artifacts,
+  });
+  return fitRunResult(detail, MAX_RUN_RESULT_DETAIL_BYTES, 'run_result_detail');
+}
+
+export function summarizeRunResultEvidenceV1(source) {
+  return projectRunResultEvidenceV1(source, { view: 'summary' });
+}
+
+export function detailRunResultEvidenceV1(source) {
+  return projectRunResultEvidenceV1(source, { view: 'detail' });
+}
+
+capturedFreeze(describeRunResultEvidenceV1);
+capturedFreeze(projectRunResultEvidenceV1);
+capturedFreeze(summarizeRunResultEvidenceV1);
+capturedFreeze(detailRunResultEvidenceV1);
diff --git a/plugins/codex-co-engineer/mcp/v3/run-tool-adapter.mjs b/plugins/codex-co-engineer/mcp/v3/run-tool-adapter.mjs
index 7065b7e..afc9962 100644
--- a/plugins/codex-co-engineer/mcp/v3/run-tool-adapter.mjs
+++ b/plugins/codex-co-engineer/mcp/v3/run-tool-adapter.mjs
@@ -91,6 +91,13 @@ import {
 import { createRunScheduler } from './run-scheduler.mjs';
 import { openRunStore } from './run-store.mjs';
 import { boundProviderResult, utf8Head } from './compact-task.mjs';
+import { inspectDelegationPreferencesV1 } from './delegation-preferences.mjs';
+import {
+  parseOwnedRevisionRequestV1,
+  OWNED_REVISION_REQUEST_KEYS,
+} from './owned-delegation.mjs';
+import { projectRunCoordinationResponseV1 } from './run-coordination-response.mjs';
+import { projectRunResultEvidenceV1 } from './run-result-evidence.mjs';
 import { projectExperience } from './response.mjs';
 import {
   assertDirectJsonClosure,
@@ -117,7 +124,7 @@ export const PUBLIC_MCP_CATALOG = capturedFreeze([
   'status', 'delegate', 'task', 'tasks', 'cancel',
 ]);
 export const RUN_TOOL_OPERATIONS = capturedFreeze([
-  'submit', 'status', 'wait', 'attention', 'reply', 'cancel', 'cleanup',
+  'submit', 'status', 'wait', 'attention', 'reply', 'revision', 'cancel', 'cleanup',
 ]);
 export const RUN_TOOL_MODES = capturedFreeze(['legacy', 'run']);
 export const ADDITIVE_WAIT_UNTIL = 'decision_or_attention';
@@ -128,7 +135,7 @@ export const WAIT_UNTIL_VALUES = capturedFreeze([
 export const ADDITIVE_STATUS_KEYS = capturedFreeze(['run_id']);
 export const ADDITIVE_DELEGATE_KEYS = capturedFreeze(['run', 'run_request']);
 export const ADDITIVE_TASK_KEYS = capturedFreeze([
-  'run_id', 'assignment_id', 'attention', 'run_reply',
+  'run_id', 'assignment_id', 'attention', 'run_reply', 'revision',
 ]);
 export const ADDITIVE_TASKS_KEYS = capturedFreeze(['run_id']);
 export const ADDITIVE_CANCEL_KEYS = capturedFreeze([
@@ -156,11 +163,12 @@ export const ATTENTION_REQUEST_KEYS = capturedFreeze(['expected_revision', 'item
 export const RUN_REPLY_KEYS = capturedFreeze([
   'approval_ref', 'batch_id', 'expected_revision', 'reply', 'request_consent',
 ]);
+export const REVISION_REQUEST_KEYS = OWNED_REVISION_REQUEST_KEYS;
 export const RUN_TOOL_RECEIPT_KEYS = capturedFreeze([
   'assignment_count', 'attention', 'audience', 'candidate', 'checks',
   'cleanup', 'complete_candidate_blocked', 'decision_or_attention',
   'dispatch_uncertain_assignment_ids', 'dispatched_assignment_ids',
-  'consent', 'cursor', 'error', 'experience', 'handoff', 'lanes', 'mode', 'operation', 'phase',
+  'consent', 'coordination', 'cursor', 'error', 'result_evidence', 'experience', 'handoff', 'lanes', 'mode', 'operation', 'phase',
   'revision',
   'remote_mutated', 'run_id', 'schema', 'side_effects', 'status', 'tool',
   'undispatched_assignment_ids', 'version', 'wait_until', 'waited_ms', 'wake',
@@ -311,6 +319,17 @@ const CONTENT_FREE = capturedFreeze({
   unknown_provider: 'The provider is not an accepted four-slot registry entry.',
   unknown_tool: 'The public catalog remains status, delegate, task, tasks, cancel.',
   simple_runtime_unavailable: 'The 3.4.2 simple run runtime is unavailable.',
+  preferred_provider_unavailable: 'The preferred provider is unknown or unavailable; supply an explicit provider.',
+  revision_producer_active: 'A revision requires a completed, certain producer.',
+  revision_producer_dirty: 'A revision requires a clean producer worktree.',
+  revision_producer_stale: 'expected_head does not match the exact producer HEAD.',
+  revision_identity_mismatch: 'expected_idempotency_key does not match the producer request identity.',
+  revision_producer_not_found: 'The named producer assignment is not known.',
+  revision_unsupported: 'Owned revision requires the supervisor reviseRun capability.',
+  revision_workspace_unsupported: 'Remote candidate revision is not supported; a local inspectable HEAD is required.',
+  revision_workspace_uninspectable: 'A revision requires a fresh successful workspace inspection.',
+  revision_lifecycle_unfinal: 'A revision requires proven terminal lifecycle; unresolved cleanup is not a completed producer.',
+  bounded_context_overflow: 'The derived correction prompt cannot preserve original constraints within the assignment bound.',
 });
 
 export const RUN_TOOL_ADAPTER_ERROR_CODES = capturedFreeze([
@@ -345,6 +364,17 @@ export const RUN_TOOL_ADAPTER_ERROR_CODES = capturedFreeze([
   'unknown_provider',
   'unknown_tool',
   'simple_runtime_unavailable',
+  'preferred_provider_unavailable',
+  'revision_producer_active',
+  'revision_producer_dirty',
+  'revision_producer_stale',
+  'revision_identity_mismatch',
+  'revision_producer_not_found',
+  'revision_unsupported',
+  'revision_workspace_unsupported',
+  'revision_workspace_uninspectable',
+  'revision_lifecycle_unfinal',
+  'bounded_context_overflow',
 ]);
 
 const ADAPTER_DEPENDENCY_KEYS = capturedFreeze([
@@ -760,14 +790,16 @@ function resolveOperation(tool, args) {
   if (tool === 'task') {
     const hasAttention = capturedHasOwn(args, 'attention');
     const hasReply = capturedHasOwn(args, 'run_reply');
+    const hasRevision = capturedHasOwn(args, 'revision');
     const waitUntil = waitUntilValue(args);
-    const flagged = [hasAttention, hasReply, waitUntil === ADDITIVE_WAIT_UNTIL]
+    const flagged = [hasAttention, hasReply, hasRevision, waitUntil === ADDITIVE_WAIT_UNTIL]
       .filter(Boolean).length;
     if (flagged > 1) {
       failAdapter('mixed_run_operation', 'task', CONTENT_FREE.mixed_run_operation);
     }
     if (hasAttention) return 'attention';
     if (hasReply) return 'reply';
+    if (hasRevision) return 'revision';
     if (waitUntil === ADDITIVE_WAIT_UNTIL || capturedHasOwn(args, 'wait_ms')) return 'wait';
     return 'status';
   }
@@ -1210,6 +1242,15 @@ function compactOverflowReceipt(compact, simpleResponseCap) {
     ...(compact.error?.code ? { error: { code: utf8Head(compact.error.code, 128) } } : {}),
     ...(compact.result !== undefined ? { result_omitted: true } : {}),
     ...(compact.candidate ? { candidate: compact.candidate } : {}),
+    ...(compact.result_evidence ? { result_evidence: {
+      label: compact.result_evidence.label,
+      assignment_result: compact.result_evidence.assignment_result,
+      codex_accepted: compact.result_evidence.codex_accepted,
+      unresolved: compact.result_evidence.unresolved,
+      next_decision: compact.result_evidence.next_decision,
+      text: utf8Head(compact.result_evidence.text, 384),
+      detail: 'diagnostics',
+    } } : {}),
     ...(compact.blockers ? { blockers: compact.blockers } : {}),
     diagnostics: {
       view: 'diagnostics',
@@ -1246,6 +1287,7 @@ function projectSemanticRunReceipt(receipt, runtimeReceipt, {
   const cleanupBlocked = cleanupNeedsAttention(receipt, unconfirmed);
   const attention = receipt.attention;
   const attentionRequired = attention?.status === 'open'
+    || attention?.status === 'blocked'
     || lanes.some((lane) => lane.status === 'needs_attention');
   const candidate = compactSemanticCandidate(runtimeReceipt, receipt.candidate);
   const verification = runtimeReceipt?.verification?.authority === 'p35'
@@ -1267,6 +1309,8 @@ function projectSemanticRunReceipt(receipt, runtimeReceipt, {
     revision: receipt.revision,
     assignment_count: receipt.assignment_count,
     authoritative_required_dispatch: receipt.authoritative_required_dispatch === true,
+    ...(runtimeReceipt?.persisted === false ? { persisted: false } : {}),
+    ...(runtimeReceipt?.correction ? { correction: sanitizeModelFacing(runtimeReceipt.correction) } : {}),
     lanes,
     ...(attentionRequired || attention?.status === 'reply_committed' || attention?.status === 'resolved'
       ? { attention }
@@ -1278,6 +1322,8 @@ function projectSemanticRunReceipt(receipt, runtimeReceipt, {
       ? { result_truncated: true }
       : {}),
     ...(candidate ? { candidate } : {}),
+    coordination: projectRunCoordinationResponseV1(runtimeReceipt),
+    ...(receipt.result_evidence ? { result_evidence: receipt.result_evidence } : {}),
     ...(verification ? { verification } : {}),
     ...(receipt.operation === 'wait' ? {
       wait_until: receipt.wait_until,
@@ -1351,6 +1397,46 @@ function compactProviderResult(result, taskId) {
   };
 }
 
+function preferenceAttentionReceipt(runId, request, preferenceView) {
+  void request;
+  const items = ARRAY_IS_ARRAY(preferenceView?.attention?.items)
+    ? preferenceView.attention.items
+    : [];
+  return {
+    schema: 'codex-co-engineer.run-admission.v1',
+    version: 1,
+    run_id: runId,
+    persisted: false,
+    phase: 'not_admitted',
+    status: 'not_admitted',
+    revision: 0,
+    cursor: '0',
+    assignment_count: 0,
+    lanes: [],
+    complete_candidate_blocked: true,
+    error: {
+      code: 'preferred_provider_unavailable',
+      message: CONTENT_FREE.preferred_provider_unavailable,
+    },
+    attention: {
+      status: 'blocked',
+      code: 'preferred_provider_unavailable',
+      next_action: 'supply_explicit_provider',
+      items,
+      wake: false,
+    },
+    consent: null,
+    admission: null,
+    dispatched_assignment_ids: [],
+    undispatched_assignment_ids: [],
+    dispatch_uncertain_assignment_ids: [],
+    authoritative_required_dispatch: false,
+    already_terminal: false,
+    telemetry: null,
+    cleanup: null,
+  };
+}
+
 function malformedRuntimeReceipt(runId) {
   return {
     schema: 'codex-co-engineer.run-admission.v1',
@@ -1383,6 +1469,11 @@ function malformedRuntimeReceipt(runId) {
 function isRuntimeReceipt(value, expectedRunId) {
   if (value === undefined || value === null || typeof value !== 'object'
     || ARRAY_IS_ARRAY(value) || IS_PROXY(value)) return false;
+  if (value.persisted === false) {
+    if (typeof value.run_id !== 'string'
+      || (typeof expectedRunId === 'string' && value.run_id !== expectedRunId)) return false;
+    return typeof value.phase === 'string' || typeof value.status === 'string';
+  }
   if (typeof value.run_id !== 'string'
     || (typeof expectedRunId === 'string' && value.run_id !== expectedRunId)) return false;
   if (!ARRAY_IS_ARRAY(value.lanes)
@@ -1531,6 +1622,24 @@ function projectReceipt(tool, operation, runtimeReceipt, projectLaneTask, classi
     already_terminal: runtimeReceipt?.already_terminal === true,
     error: sanitizeModelFacing(runtimeReceipt?.error ?? null),
     telemetry: sanitizeModelFacing(runtimeReceipt?.telemetry ?? null),
+    ...(runtimeReceipt?.correction ? { correction: sanitizeModelFacing(runtimeReceipt.correction) } : {}),
+    ...(simpleAdmission && runtimeReceipt.persisted !== false && runtimeReceipt.usage_ledger != null
+      && runtimeReceipt.lanes.length > 0 ? {
+      result_evidence: projectRunResultEvidenceV1(JSON.parse(JSON.stringify({
+        schema: runtimeReceipt.schema, run_id: runtimeReceipt.run_id,
+        phase: runtimeReceipt.phase, base_sha: runtimeReceipt.base_sha,
+        lanes: runtimeReceipt.lanes.map(lane => ({
+          assignment_id: lane.assignment_id, provider: lane.provider, role: lane.role,
+          required: lane.required, status: lane.status, phase: lane.phase,
+          prompt_dispatched: lane.prompt_dispatched,
+          dispatch_confidence: lane.dispatch_confidence, task_final: lane.task_final,
+          clean: lane.clean ?? lane.handoff?.clean, head: lane.head,
+        })),
+        usage_ledger: runtimeReceipt.usage_ledger,
+      })), {
+        view: view === 'diagnostics' ? 'detail' : 'summary',
+      }),
+    } : {}),
     ...(operation === 'wait' ? {
       wait_until: capturedIncludes(WAIT_UNTIL_VALUES, runtimeReceipt?.wait_until)
         ? runtimeReceipt.wait_until
@@ -1863,9 +1972,16 @@ export function createRunToolAdapter(dependencies) {
           base_sha: parsed.context.base_sha,
           digest: null,
         });
-        counters.submit += 1;
-        runtimeReceipt = await simpleRuntime.submitRunRequest(parsed.simpleRequest, { signal });
-        simpleRunIds.add(parsed.runId);
+        const preferenceView = inspectDelegationPreferencesV1(parsed.simpleRequest);
+        if (preferenceView.attention) {
+          runtimeReceipt = preferenceAttentionReceipt(
+            parsed.runId, parsed.simpleRequest, preferenceView,
+          );
+        } else {
+          counters.submit += 1;
+          runtimeReceipt = await simpleRuntime.submitRunRequest(parsed.simpleRequest, { signal });
+          simpleRunIds.add(parsed.runId);
+        }
       } else {
       if (parsed.catalogSnapshot !== null && parsed.catalogSnapshot !== undefined) {
         pendingRunCatalogSnapshots.set(parsed.runId, parsed.catalogSnapshot);
@@ -2022,6 +2138,25 @@ export function createRunToolAdapter(dependencies) {
         assignment_ids: assignmentIds,
         cleanup: operation === 'cleanup',
       }));
+    } else if (operation === 'revision') {
+      if (simpleRuntime === null) {
+        failAdapter('simple_runtime_unavailable', 'revision', CONTENT_FREE.simple_runtime_unavailable);
+      }
+      const runId = requireRunId(args);
+      requestedRunId = runId;
+      const revision = parseOwnedRevisionRequestV1(
+        quarantineObject(ownDataValue(args, 'revision', 'revision'), 'revision', REVISION_REQUEST_KEYS),
+        'revision',
+      );
+      if (typeof simpleRuntime.reviseRun !== 'function') {
+        failAdapter('revision_unsupported', 'revision', CONTENT_FREE.revision_unsupported);
+      }
+      counters.submit += 1;
+      runtimeReceipt = await simpleRuntime.reviseRun({ run_id: runId, revision }, { signal });
+      if (typeof runtimeReceipt?.run_id === 'string') {
+        simpleRunIds.add(runtimeReceipt.run_id);
+        requestedRunId = runtimeReceipt.run_id;
+      }
     } else {
       failAdapter('unknown_operation', 'tool', CONTENT_FREE.unknown_operation);
     }
diff --git a/plugins/codex-co-engineer/mcp/v3/server.mjs b/plugins/codex-co-engineer/mcp/v3/server.mjs
index 9aeda69..15e23f7 100644
--- a/plugins/codex-co-engineer/mcp/v3/server.mjs
+++ b/plugins/codex-co-engineer/mcp/v3/server.mjs
@@ -94,7 +94,7 @@ const RESPONSE_MODE_PROPERTY = {
 
 const RESPONSE_MODE_HINT = ' Native runs default to bounded structured-first text; text-only run clients may set response_mode="legacy" to encode the same compact semantic receipt fully in text. Use task.run_id with view="diagnostics" for detailed run evidence. Omitted legacy single-task calls retain full compatible text.';
 
-const SERVER_INSTRUCTIONS = 'Use delegate.run_request for one bounded run, then task.run_id with the returned cursor for status or waits; use task.run_reply for one same-session decision, tasks.run_id for aggregate waits, and cancel.run_id to cancel. Use task_id for expanded task diagnostics or legacy single-task calls.';
+const SERVER_INSTRUCTIONS = 'Use delegate.run_request for one bounded run, then task.run_id with the returned cursor for status or waits; use task.run_reply for one same-session decision, task.revision for a bounded producer correction, tasks.run_id for aggregate waits, and cancel.run_id to cancel. Optional run_request.preferences reuse provider ownership by role; exact assignment provider/model win. Use task_id for expanded task diagnostics or legacy single-task calls.';
 
 const RUN_TOOL_OUTPUT_SCHEMA = {
   type: 'object',
@@ -209,6 +209,40 @@ const TOOLS = [
             repo: { type: 'string', description: 'Canonical absolute Git worktree path.' },
             objective: { type: 'string', minLength: 1, maxLength: 4096 },
             base_sha: { type: 'string', pattern: '^[0-9a-f]{40}$', description: 'Optional exact local base SHA; omitted means the observed clean HEAD.' },
+            preferences: {
+              type: 'object',
+              additionalProperties: false,
+              description: 'Optional reusable provider ownership by role. Omitted assignment provider/model fields are filled from the matching role. Exact assignment selections win. Unknown or unavailable preferred providers are reported only when an assignment would use them; unused unknown role preferences are ignored.',
+              properties: {
+                implement: {
+                  type: 'object',
+                  additionalProperties: false,
+                  required: ['provider'],
+                  properties: {
+                    provider: { type: 'string' },
+                    model: { type: 'string', maxLength: 128 },
+                  },
+                },
+                review: {
+                  type: 'object',
+                  additionalProperties: false,
+                  required: ['provider'],
+                  properties: {
+                    provider: { type: 'string' },
+                    model: { type: 'string', maxLength: 128 },
+                  },
+                },
+                verify: {
+                  type: 'object',
+                  additionalProperties: false,
+                  required: ['provider'],
+                  properties: {
+                    provider: { type: 'string' },
+                    model: { type: 'string', maxLength: 128 },
+                  },
+                },
+              },
+            },
             assignments: {
               type: 'array',
               minItems: 1,
@@ -216,10 +250,10 @@ const TOOLS = [
               items: {
                 type: 'object',
                 additionalProperties: false,
-                required: ['assignment_id', 'provider', 'role', 'prompt'],
+                required: ['assignment_id', 'role', 'prompt'],
                 properties: {
                   assignment_id: { type: 'string', pattern: '^[a-z][a-z0-9-]{0,63}$' },
-                  provider: { type: 'string', enum: ['grok', 'cursor-local', 'cursor-cloud', 'dsh'] },
+                  provider: { type: 'string', enum: ['grok', 'cursor-local', 'cursor-cloud', 'dsh'], description: 'Optional when a matching run_request.preferences role entry fills it. Exact values win over preferences.' },
                   model: { type: 'string', maxLength: 128, description: 'Optional exact model override; otherwise the closed provider default is derived.' },
                   role: { type: 'string', enum: ['implement', 'review', 'verify'] },
                   access: { type: 'string', enum: ['write', 'writer', 'read', 'read_only'], description: 'Optional explicit access. Omitted access is derived from role: implement means writer; review and verify mean read_only.' },
@@ -277,7 +311,7 @@ const TOOLS = [
     title: TOOL_METADATA.task.title,
     annotations: TOOL_METADATA.task.annotations,
     outputSchema: RUN_TOOL_OUTPUT_SCHEMA,
-    description: `Inspect or wait on one bounded native run using run_id and its returned cursor. Native run_request calls return the compact coordination receipt by default. Use view=diagnostics for the detailed run receipt; view=compact explicitly selects the normal compact run projection. task_id remains the compatible 3.2.1 path and uses event_cursor for expanded lane progress and diagnostics. wait_until=terminal waits for a terminal or needs-attention state without waking on routine text. Optional reply delivers a same-session answer exactly once. Optional extend_* records an audited deadline extension. Disconnecting this waiter does not stop provider work. Unsolicited stdio callbacks across assistant turns are not available.${RESPONSE_MODE_HINT}`,
+    description: `Inspect or wait on one bounded native run using run_id and its returned cursor. Native run_request calls return the compact coordination receipt by default. Use view=diagnostics for the detailed run receipt; view=compact explicitly selects the normal compact run projection. Optional revision derives a fresh bounded correction from a completed, clean, exactly identified producer while preserving provider, model, and write scope. task_id remains the compatible 3.2.1 path and uses event_cursor for expanded lane progress and diagnostics. wait_until=terminal waits for a terminal or needs-attention state without waking on routine text. Optional reply delivers a same-session answer exactly once. Optional extend_* records an audited deadline extension. Disconnecting this waiter does not stop provider work. Unsolicited stdio callbacks across assistant turns are not available.${RESPONSE_MODE_HINT}`,
     inputSchema: {
       type: 'object',
       properties: {
@@ -385,6 +419,18 @@ const TOOLS = [
             },
           ],
         },
+        revision: {
+          type: 'object',
+          additionalProperties: false,
+          required: ['assignment_id', 'feedback', 'expected_head', 'expected_idempotency_key'],
+          description: 'Derive a new bounded correction assignment from a completed, clean producer. Preserves provider, model, write scope, and original assignment context. Uses the public producer request identity, exact per-assignment HEAD, and a fresh revision identity. Never replays an active, uncertain, dirty, uninspectable, or unfinal producer. Same expected head, identity, and feedback are idempotent.',
+          properties: {
+            assignment_id: { type: 'string', pattern: '^[a-z][a-z0-9-]{0,63}$' },
+            feedback: { type: 'string', minLength: 1, maxLength: 4096 },
+            expected_head: { type: 'string', pattern: '^[0-9a-f]{40}$', description: 'Exact current producer HEAD. Stale values fail closed.' },
+            expected_idempotency_key: { type: 'string', pattern: '^sha256:[0-9a-f]{64}$', description: 'Exact producer request identity.' },
+          },
+        },
       },
       allOf: [
         {
@@ -393,6 +439,19 @@ const TOOLS = [
           else: { required: ['task_id'] },
         },
         { not: { required: ['run_id', 'task_id'] } },
+        {
+          if: { required: ['revision'] },
+          then: {
+            required: ['run_id', 'revision'],
+            not: {
+              anyOf: [
+                { required: ['attention'] },
+                { required: ['run_reply'] },
+                { required: ['task_id'] },
+              ],
+            },
+          },
+        },
       ],
       additionalProperties: false,
     },
diff --git a/plugins/codex-co-engineer/mcp/v3/supervisor.mjs b/plugins/codex-co-engineer/mcp/v3/supervisor.mjs
index 0082144..43bf3bf 100644
--- a/plugins/codex-co-engineer/mcp/v3/supervisor.mjs
+++ b/plugins/codex-co-engineer/mcp/v3/supervisor.mjs
@@ -72,11 +72,18 @@ import {
   cancelSupervisorSameSessionReplyV1,
 } from './run-tool-adapter.mjs';
 import { createRunAdmissionRuntime } from './run-admission.mjs';
+import { RunContractV1Error } from './run-manifest.mjs';
 import { createRunAdmissionStore } from './run-admission-store.mjs';
 import {
   compileRunRequestV1,
   RUN_REQUEST_DEFAULT_MODELS,
 } from './run-request-compiler.mjs';
+import {
+  assertOwnedRevisionProducerV1,
+  deriveOwnedRevisionRequestV1,
+  parseOwnedRevisionRequestV1,
+  projectOwnedProducerCandidateV1,
+} from './owned-delegation.mjs';
 import { loadReadinessSnapshot, saveReadinessSnapshot } from './readiness-snapshot.mjs';
 import { buildGitIdentityV1, buildWorkspaceIdentityV1 } from './protected-identity.mjs';
 import { assertRuntimeEntrypoints } from './runtime-entrypoints.mjs';
@@ -2358,8 +2365,101 @@ function createSupervisorRunAdmissionRuntime(options = {}) {
     })),
     loadRecord: options.loadRecord ?? admissionStore.load,
     persistRecord: options.persistRecord ?? admissionStore.save,
+    // Custom persistence must supply its own atomic reservation. Do not mix a
+    // second disk store, and never fall back to an always-success reservation.
+    reserveRevision: options.reserveRevision ?? (
+      options.loadRecord || options.persistRecord
+        ? async () => {
+          throw new RunContractV1Error(
+            'revision_reservation_unavailable',
+            'reserveRevision',
+            'Revision admission requires an atomic reservation.',
+          );
+        }
+        : admissionStore.reserveRevision
+    ),
   };
-  return createRunAdmissionRuntime(simpleDeps);
+  const runtime = createRunAdmissionRuntime(simpleDeps);
+  const loadRecord = simpleDeps.loadRecord;
+  const inspectWorkspace = simpleDeps.inspectWorkspace;
+  async function reviseRun(request, reviseOptions = {}) {
+    const runId = request?.run_id;
+    const revision = parseOwnedRevisionRequestV1(request?.revision, 'revision');
+    let record = await loadRecord(runId);
+    if (!record) {
+      throw new RunContractV1Error(
+        'revision_producer_not_found',
+        'run_id',
+        'The named producer assignment is not known.',
+      );
+    }
+    await runtime.inspectRun({ run_id: runId });
+    record = await loadRecord(runId);
+    const assignment = record.compiled?.assignments?.find((entry) => entry.assignment_id === revision.assignment_id);
+    const lane = record.lanes?.find((entry) => entry.assignment_id === revision.assignment_id);
+    if (!assignment || !lane) {
+      throw new RunContractV1Error(
+        'revision_producer_not_found',
+        'revision.assignment_id',
+        'The named producer assignment is not known.',
+      );
+    }
+    let workspace;
+    try {
+      workspace = await inspectWorkspace({
+        root,
+        run_id: runId,
+        assignment_id: revision.assignment_id,
+        task_id: lane.task_id,
+        workspace: lane.workspace,
+      });
+    } catch {
+      workspace = null;
+    }
+    const producer = projectOwnedProducerCandidateV1({ record, assignment, lane, workspace });
+    assertOwnedRevisionProducerV1(producer, revision);
+    if (typeof lane.task_id !== 'string' || lane.task_id.length === 0) {
+      throw new RunContractV1Error(
+        'revision_lifecycle_unfinal',
+        'revision',
+        'A revision requires proven terminal lifecycle; a missing task is not a completed producer.',
+      );
+    }
+    let task;
+    try {
+      ({ task } = await readTask(root, lane.task_id));
+    } catch {
+      throw new RunContractV1Error(
+        'revision_lifecycle_unfinal',
+        'revision',
+        'A revision requires proven terminal lifecycle; a missing task is not a completed producer.',
+      );
+    }
+    if (!task || typeof task !== 'object' || Array.isArray(task)
+      || task.id !== lane.task_id
+      || task.run_id !== record.run_id
+      || task.assignment_id !== assignment.assignment_id) {
+      throw new RunContractV1Error(
+        'revision_lifecycle_unfinal',
+        'revision',
+        'A revision requires proven terminal lifecycle; unresolved cleanup is not a completed producer.',
+      );
+    }
+    const classified = classifySupervisorTerminalReceipt(task);
+    if (classified.projected_status !== 'completed' && classified.projected_status !== 'succeeded') {
+      throw new RunContractV1Error(
+        'revision_lifecycle_unfinal',
+        'revision',
+        'A revision requires proven terminal lifecycle; unresolved cleanup is not a completed producer.',
+      );
+    }
+    const derived = deriveOwnedRevisionRequestV1(producer, revision);
+    return runtime.submitOwnedRevision(record.run_id, derived, reviseOptions);
+  }
+  return Object.freeze({
+    ...runtime,
+    reviseRun,
+  });
 }
 
 const AUTHENTICATION_FAILURE_PATTERN = /not signed in|not authenticated|log ?in required|unauthori[sz]ed/iu;
@@ -2946,6 +3046,7 @@ export async function createSupervisorRunToolAdapter(options = {}) {
       admissionStore: options.admissionStore,
       loadRecord: options.loadRecord,
       persistRecord: options.persistRecord,
+      reserveRevision: options.reserveRevision,
       waitForProgress: options.waitForProgress,
     });
   return createRunToolAdapter({
diff --git a/plugins/codex-co-engineer/mcp/v3/usage-ledger.mjs b/plugins/codex-co-engineer/mcp/v3/usage-ledger.mjs
index 2429cc9..122c448 100644
--- a/plugins/codex-co-engineer/mcp/v3/usage-ledger.mjs
+++ b/plugins/codex-co-engineer/mcp/v3/usage-ledger.mjs
@@ -131,6 +131,44 @@ export const USAGE_AGGREGATE_ROW_KEYS = capturedFreeze([
 export const USAGE_TOTALS_KEYS = capturedFreeze([
   'identity_count', 'observation_count', 'provider_usage', 'host_usage',
 ]);
+export const USAGE_SUMMARY_SCHEMA_ID = 'codex-co-engineer.usage-summary.v1';
+export const USAGE_DETAIL_SCHEMA_ID = 'codex-co-engineer.usage-detail.v1';
+export const USAGE_REPORT_VIEWS = capturedFreeze(['summary', 'detail']);
+export const MAX_USAGE_SUMMARY_BYTES = 1536;
+export const MAX_USAGE_SUMMARY_TEXT_BYTES = 512;
+export const MAX_USAGE_DETAIL_BYTES = 8192;
+export const USAGE_SAVINGS_NONCLAIM = 'not_inferred';
+export const USAGE_SUBSCRIPTION_UNKNOWN = 'unknown';
+export const USAGE_NATIVE_TOKENS_UNKNOWN = 'unknown';
+export const USAGE_TOKEN_TOTALS_COMPARABLE = 'comparable';
+export const USAGE_TOKEN_TOTALS_NON_COMPARABLE = 'non_comparable';
+export const USAGE_TOKEN_TOTALS_UNKNOWN = 'unknown';
+export const USAGE_REPORT_TRUNCATION_REASON = 'report_bound';
+export const USAGE_REPORT_TRUNCATION_KEYS = capturedFreeze([
+  'fields', 'omitted', 'original_count', 'reason', 'retained', 'truncated',
+]);
+export const USAGE_SUMMARY_METRIC_KEYS = capturedFreeze([
+  'input_tokens', 'output_tokens', 'cache_tokens', 'cost_millicents',
+  'model_facing_bytes', 'retrievable_evidence_bytes', 'submissions', 'elapsed_ms',
+]);
+export const USAGE_METRIC_UNITS = capturedFreeze(Object.assign(capturedCreate(null), {
+  input_tokens: 'tokens',
+  output_tokens: 'tokens',
+  cache_tokens: 'tokens',
+  cost_millicents: 'millicents',
+  model_facing_bytes: 'bytes',
+  retrievable_evidence_bytes: 'bytes',
+  submissions: 'count',
+  provider_invocations: 'count',
+  aggregate_waits: 'count',
+  attention_rounds: 'count',
+  tool_calls: 'count',
+  elapsed_ms: 'milliseconds',
+  retry_count: 'count',
+  no_replay_count: 'count',
+  luna_wake_events: 'count',
+  sol_wake_events: 'count',
+}));
 
 export const MIN_USAGE_SEQ = 1;
 export const MIN_USAGE_GENERATION = 1;
@@ -1271,6 +1309,373 @@ export function recordRuntimeUsageObservationV1(previousValue, observation) {
   });
 }
 
+function metricUnit(key) {
+  return USAGE_METRIC_UNITS[key] ?? 'count';
+}
+
+function metricFromTotals(totals, key) {
+  if (capturedIncludes(PROVIDER_USAGE_KEYS, key)) return totals.provider_usage[key];
+  return totals.host_usage[key];
+}
+
+function labeledMetric(key, metric) {
+  const unknown = metric == null || metric.source === 'unknown' || metric.value === null;
+  return {
+    key,
+    value: unknown ? null : metric.value,
+    unit: metricUnit(key),
+    source: unknown ? 'unknown' : metric.source,
+    trust: unknown ? 'unknown' : metric.trust,
+  };
+}
+
+function detailedMetric(key, metric) {
+  const labeled = labeledMetric(key, metric);
+  return {
+    ...labeled,
+    reported_sum: metric?.reported_sum ?? null,
+    reported_count: NUMBER_IS_SAFE_INTEGER(metric?.reported_count) ? metric.reported_count : 0,
+    unknown_count: NUMBER_IS_SAFE_INTEGER(metric?.unknown_count) ? metric.unknown_count : 0,
+  };
+}
+
+function clipUsageText(text, maxBytes) {
+  if (BUFFER_BYTE_LENGTH(text, 'utf8') <= maxBytes) return text;
+  const encoded = NodeBuffer.from(text, 'utf8');
+  let end = maxBytes - 3;
+  while (end > 0 && (encoded[end] & 0xc0) === 0x80) end -= 1;
+  return `${encoded.subarray(0, end).toString('utf8')}…`;
+}
+
+function formatMetricPhrase(metric) {
+  const value = STRING(metric.value);
+  if (metric.key === 'submissions') return `${value} submission${metric.value === 1 ? '' : 's'}`;
+  if (metric.key === 'elapsed_ms') return `${value} ms elapsed`;
+  if (metric.key === 'input_tokens') return `${value} input tokens`;
+  if (metric.key === 'output_tokens') return `${value} output tokens`;
+  if (metric.key === 'cache_tokens') return `${value} cached tokens`;
+  const label = STRING(metric.key).split('_').join(' ');
+  const unit = metric.unit === 'count' ? '' : ` ${metric.unit}`;
+  return `${label}: ${value}${unit}`;
+}
+
+function tokenComparability(totals) {
+  let reportedGroups = 0;
+  let knownTotal = false;
+  for (const key of PROVIDER_USAGE_KEYS) {
+    const metric = totals.provider_usage[key];
+    if (metric.value !== null) knownTotal = true;
+    if (NUMBER_IS_SAFE_INTEGER(metric.reported_count) && metric.reported_count > 0) {
+      if (metric.value === null && metric.unknown_count === 0 && metric.reported_count > 1) {
+        reportedGroups = metric.reported_count;
+      }
+    }
+  }
+  if (knownTotal) return USAGE_TOKEN_TOTALS_COMPARABLE;
+  if (reportedGroups > 1) return USAGE_TOKEN_TOTALS_NON_COMPARABLE;
+  return USAGE_TOKEN_TOTALS_UNKNOWN;
+}
+
+function compactProviderGroups(aggregates) {
+  if (!capturedIsArray(aggregates)) return [];
+  const groups = [];
+  for (let index = 0; index < aggregates.length; index += 1) {
+    const row = aggregates[index];
+    if (row == null || row.scope !== 'provider') continue;
+    const metrics = [];
+    for (const key of PROVIDER_USAGE_KEYS) {
+      metrics.push(labeledMetric(key, row.provider_usage?.[key]));
+    }
+    groups.push({
+      scope: 'provider',
+      key: row.key,
+      identity_count: NUMBER_IS_SAFE_INTEGER(row.identity_count) ? row.identity_count : 0,
+      metrics,
+    });
+  }
+  return groups;
+}
+
+function compactUsageText(metrics, unknownKeys, present, comparability) {
+  const closing = 'Native token balance is unknown. Savings are not inferred.';
+  if (present !== true) {
+    return `No usage recorded. ${closing}`;
+  }
+  const parts = [];
+  if (comparability === USAGE_TOKEN_TOTALS_NON_COMPARABLE) {
+    parts.push('Provider token totals are not comparable across providers.');
+  }
+  const providerKnown = [];
+  const hostKnown = [];
+  for (const metric of metrics) {
+    if (metric.value === null || metric.source === 'unknown') continue;
+    if (metric.source === 'provider_report') providerKnown.push(metric);
+    else hostKnown.push(metric);
+  }
+  if (providerKnown.length > 0 && comparability !== USAGE_TOKEN_TOTALS_NON_COMPARABLE) {
+    parts.push(`Provider-reported ${providerKnown.map(formatMetricPhrase).join(', ')}.`);
+  } else if (providerKnown.length === 0 && unknownKeys.some((key) => capturedIncludes(PROVIDER_USAGE_KEYS, key))) {
+    parts.push('Provider-reported tokens are unknown.');
+  }
+  if (hostKnown.length > 0) {
+    parts.push(`Host-measured ${hostKnown.map(formatMetricPhrase).join(', ')}.`);
+  }
+  parts.push(closing);
+  return parts.join(' ');
+}
+
+function collectMetrics(totals, keys, detailed) {
+  const metrics = [];
+  const unknown = [];
+  for (const key of keys) {
+    const metric = metricFromTotals(totals, key);
+    const row = detailed ? detailedMetric(key, metric) : labeledMetric(key, metric);
+    if (row.source === 'unknown' || row.value === null) {
+      unknown.push(key);
+      if (detailed) metrics.push(row);
+    } else {
+      metrics.push(row);
+    }
+  }
+  return { metrics, unknown };
+}
+
+function emptyTruncation(count) {
+  return {
+    truncated: false,
+    fields: [],
+    original_count: count,
+    retained: count,
+    omitted: 0,
+    reason: null,
+  };
+}
+
+function reportTruncation(fields, originalCount, retained) {
+  return {
+    truncated: true,
+    fields,
+    original_count: originalCount,
+    retained,
+    omitted: originalCount > retained ? originalCount - retained : 0,
+    reason: USAGE_REPORT_TRUNCATION_REASON,
+  };
+}
+
+function usageReportBytes(record) {
+  return BUFFER_BYTE_LENGTH(canonicalExtendedJsonStringify(record), 'utf8');
+}
+
+function compactMetricRow(row) {
+  return {
+    key: row.key,
+    value: row.value,
+    unit: row.unit,
+    source: row.source,
+    trust: row.trust,
+  };
+}
+
+function fitUsageReport(record, maxBytes) {
+  const originalMetricCount = capturedIsArray(record.metrics) ? record.metrics.length : 0;
+  const originalGroupCount = capturedIsArray(record.groups) ? record.groups.length : 0;
+  const originalCount = originalMetricCount + originalGroupCount;
+  if (usageReportBytes(record) <= maxBytes) {
+    return record.truncation == null
+      ? { ...record, truncation: emptyTruncation(originalCount) }
+      : record;
+  }
+  const fields = [];
+  let current = { ...record };
+  const clipTo = (limit) => {
+    const nextText = clipUsageText(current.text, limit);
+    if (nextText !== current.text) {
+      if (!capturedIncludes(fields, 'text')) fields.push('text');
+      current = { ...current, text: nextText };
+    }
+  };
+  clipTo(240);
+  if (usageReportBytes({
+    ...current,
+    truncation: reportTruncation(fields.length > 0 ? fields : ['text'], originalCount, originalCount),
+  }) <= maxBytes) {
+    return {
+      ...current,
+      truncation: reportTruncation(fields, originalCount, originalCount),
+    };
+  }
+  if (capturedIsArray(current.groups) && current.groups.length > 0) {
+    fields.push('groups');
+    current = { ...current, groups: [] };
+  }
+  clipTo(120);
+  const compactMetrics = [];
+  for (let index = 0; index < current.metrics.length; index += 1) {
+    compactMetrics.push(compactMetricRow(current.metrics[index]));
+  }
+  if (compactMetrics.length !== current.metrics.length
+    || (current.metrics[0] && current.metrics[0].reported_sum !== undefined)) {
+    fields.push('metrics');
+  }
+  current = { ...current, metrics: compactMetrics };
+  const tryRecord = (next, retained) => {
+    const truncation = reportTruncation(
+      fields.length > 0 ? fields : ['metrics'],
+      originalCount,
+      retained,
+    );
+    const candidate = { ...next, truncation };
+    return usageReportBytes(candidate) <= maxBytes ? candidate : null;
+  };
+  const fittedCompact = tryRecord(current, originalCount);
+  if (fittedCompact) return fittedCompact;
+  const known = [];
+  for (let index = 0; index < current.metrics.length; index += 1) {
+    if (current.metrics[index].value !== null && current.metrics[index].source !== 'unknown') {
+      known.push(current.metrics[index]);
+    }
+  }
+  if (!capturedIncludes(fields, 'metrics')) fields.push('metrics');
+  while (known.length > 0) {
+    const retainedRows = current.view === 'detail'
+      ? [...known, ...current.metrics.filter((row) => row.value === null || row.source === 'unknown')]
+      : known;
+    const fitted = tryRecord({ ...current, metrics: retainedRows }, retainedRows.length);
+    if (fitted) return fitted;
+    known.pop();
+  }
+  const unknownOnly = current.view === 'detail'
+    ? current.metrics.filter((row) => row.value === null || row.source === 'unknown')
+    : [];
+  current = {
+    ...current,
+    metrics: unknownOnly,
+    text: clipUsageText(current.text, 80),
+  };
+  if (!capturedIncludes(fields, 'text')) fields.push('text');
+  const minimal = tryRecord(current, unknownOnly.length);
+  if (minimal) return minimal;
+  const lastResort = {
+    schema: current.schema,
+    view: current.view,
+    present: current.present,
+    identities: current.identities,
+    observations: current.observations,
+    metrics: [],
+    unknown: current.unknown,
+    savings: current.savings,
+    subscription: current.subscription,
+    token_totals: current.token_totals,
+    text: clipUsageText(
+      current.present === true
+        ? 'Usage recorded; retrieve detail. Native token balance is unknown. Savings are not inferred.'
+        : 'No usage recorded. Native token balance is unknown. Savings are not inferred.',
+      120,
+    ),
+    truncation: reportTruncation(['metrics', 'text', 'groups'], originalCount, 0),
+  };
+  if (current.view === 'detail') lastResort.native_tokens = USAGE_NATIVE_TOKENS_UNKNOWN;
+  if (usageReportBytes(lastResort) <= maxBytes) return lastResort;
+  lastResort.text = clipUsageText('Usage truncated. Native tokens unknown.', 48);
+  if (usageReportBytes(lastResort) <= maxBytes) return lastResort;
+  lastResort.unknown = current.unknown.slice(0, 8);
+  lastResort.truncation = reportTruncation(['metrics', 'text', 'groups', 'unknown'], originalCount, 0);
+  return lastResort;
+}
+
+function snapshotUsageReport(record, maxBytes, path) {
+  const fitted = fitUsageReport(record, maxBytes);
+  const encoded = canonicalExtendedJsonStringify(fitted);
+  if (BUFFER_BYTE_LENGTH(encoded, 'utf8') > maxBytes) {
+    fail('out_of_range', path, `Usage ${record.view} report exceeds ${maxBytes} bytes.`);
+  }
+  return freezeData(JSON_PARSE(encoded));
+}
+
+function emptyUnknownTotals() {
+  const providerUsage = capturedCreate(null);
+  const hostUsage = capturedCreate(null);
+  for (const key of PROVIDER_USAGE_KEYS) providerUsage[key] = emptyAggregateMetric();
+  for (const key of HOST_USAGE_KEYS) hostUsage[key] = emptyAggregateMetric();
+  return { provider_usage: providerUsage, host_usage: hostUsage };
+}
+
+function buildUsageReport(view, totals, aggregates, present) {
+  const detailed = view === 'detail';
+  const keys = detailed ? USAGE_BUDGET_METRICS : USAGE_SUMMARY_METRIC_KEYS;
+  const { metrics, unknown } = collectMetrics(totals, keys, detailed);
+  const comparability = present === true ? tokenComparability(totals) : USAGE_TOKEN_TOTALS_UNKNOWN;
+  const groups = detailed && present === true ? compactProviderGroups(aggregates) : [];
+  const knownForText = metrics.filter((row) => row.value !== null && row.source !== 'unknown');
+  const record = {
+    schema: detailed ? USAGE_DETAIL_SCHEMA_ID : USAGE_SUMMARY_SCHEMA_ID,
+    view,
+    present,
+    identities: present === true ? totals.identity_count : null,
+    observations: present === true ? totals.observation_count : null,
+    metrics,
+    unknown,
+    savings: USAGE_SAVINGS_NONCLAIM,
+    subscription: USAGE_SUBSCRIPTION_UNKNOWN,
+    token_totals: comparability,
+    text: clipUsageText(
+      compactUsageText(knownForText, unknown, present, comparability),
+      detailed ? 480 : MAX_USAGE_SUMMARY_TEXT_BYTES,
+    ),
+  };
+  if (detailed) {
+    record.native_tokens = USAGE_NATIVE_TOKENS_UNKNOWN;
+    record.groups = groups;
+  }
+  return record;
+}
+
+export function unknownUsageReportV1(view = 'summary') {
+  assertEnum(view, USAGE_REPORT_VIEWS, 'usage_report.view');
+  return snapshotUsageReport(
+    buildUsageReport(view, emptyUnknownTotals(), [], false),
+    view === 'detail' ? MAX_USAGE_DETAIL_BYTES : MAX_USAGE_SUMMARY_BYTES,
+    'usage_report',
+  );
+}
+
+export function summarizeUsageLedgerV1(ledgerValue) {
+  if (ledgerValue == null) return unknownUsageReportV1('summary');
+  const ledger = validateUsageLedgerV1(ledgerValue);
+  return snapshotUsageReport(
+    buildUsageReport('summary', ledger.totals, ledger.aggregates, true),
+    MAX_USAGE_SUMMARY_BYTES,
+    'usage_summary',
+  );
+}
+
+export function detailUsageLedgerV1(ledgerValue) {
+  if (ledgerValue == null) return unknownUsageReportV1('detail');
+  const ledger = validateUsageLedgerV1(ledgerValue);
+  return snapshotUsageReport(
+    buildUsageReport('detail', ledger.totals, ledger.aggregates, true),
+    MAX_USAGE_DETAIL_BYTES,
+    'usage_detail',
+  );
+}
+
+export function projectUsageReportV1(ledgerValue, options) {
+  const view = options == null ? 'summary' : options.view;
+  const selected = view == null ? 'summary' : view;
+  assertEnum(selected, USAGE_REPORT_VIEWS, 'usage_report.view');
+  if (ledgerValue == null) return unknownUsageReportV1(selected);
+  const ledger = validateUsageLedgerV1(ledgerValue);
+  const maxBytes = selected === 'detail'
+    ? (NUMBER_IS_SAFE_INTEGER(options?.max_bytes) ? options.max_bytes : MAX_USAGE_DETAIL_BYTES)
+    : (NUMBER_IS_SAFE_INTEGER(options?.max_bytes) ? options.max_bytes : MAX_USAGE_SUMMARY_BYTES);
+  const bound = selected === 'detail' ? MAX_USAGE_DETAIL_BYTES : MAX_USAGE_SUMMARY_BYTES;
+  return snapshotUsageReport(
+    buildUsageReport(selected, ledger.totals, ledger.aggregates, true),
+    maxBytes < 1 ? bound : (maxBytes > bound ? bound : maxBytes),
+    selected === 'detail' ? 'usage_detail' : 'usage_summary',
+  );
+}
+
 capturedFreeze(validateUsageIdentityV1);
 capturedFreeze(buildUsageIdentityV1);
 capturedFreeze(validateUsageReceiptV1);
@@ -1291,5 +1696,9 @@ capturedFreeze(canonicalUsageTimestampV1);
 capturedFreeze(correlateUsageModelV1);
 capturedFreeze(correlateUsageAssignmentV1);
 capturedFreeze(recordRuntimeUsageObservationV1);
+capturedFreeze(unknownUsageReportV1);
+capturedFreeze(summarizeUsageLedgerV1);
+capturedFreeze(detailUsageLedgerV1);
+capturedFreeze(projectUsageReportV1);
 
 export { IDENTITY_LABELS, TELEMETRY_CORRELATION_SCHEMA_ID };
diff --git a/plugins/codex-co-engineer/package.json b/plugins/codex-co-engineer/package.json
index b74b35b..fd690b2 100644
--- a/plugins/codex-co-engineer/package.json
+++ b/plugins/codex-co-engineer/package.json
@@ -1,6 +1,6 @@
 {
   "name": "codex-co-engineer",
-  "version": "3.4.2",
+  "version": "3.4.3",
   "private": false,
   "description": "Codex-Co-Engineer: ACP-first delegation to Grok, Cursor, Cursor Cloud, and DeepSeek Harness.",
   "license": "MIT",
diff --git a/plugins/codex-co-engineer/skills/chat-with-co-engineer/SKILL.md b/plugins/codex-co-engineer/skills/chat-with-co-engineer/SKILL.md
index 298bb2a..bbf303f 100644
--- a/plugins/codex-co-engineer/skills/chat-with-co-engineer/SKILL.md
+++ b/plugins/codex-co-engineer/skills/chat-with-co-engineer/SKILL.md
@@ -1,18 +1,26 @@
 ---
 name: chat-with-co-engineer
-description: Inspect, continue, answer grouped questions, or cancel an existing Co-Engineer run. Use for Chatting with Co-Engineer; never start new work.
+description: Inspect, continue, answer grouped questions, or cancel an existing Co-Engineer run. Use for Chatting with Co-Engineer and bounded same-provider candidate revisions; never start unrelated work.
 ---
 
 # Chatting with Co-Engineer
 
-Never start a run. Codex remains reviewer and merge authority. Use the existing
-run to inspect, continue, answer grouped attention, or cancel. If no run exists,
+Never start a run for unrelated work; continue the existing assignment. Codex remains
+reviewer and merge authority. Use its returned identity to
+inspect, continue, answer grouped attention, or cancel. If no run exists,
 offer `$delegate-to-co-engineer`.
 
 Wait through `task` with the run ID, `decision_or_attention`, and the same run
 cursor. Routine progress needs no polling. On host timeout, reconnect to the same
 run. Answer with `run_reply`; cancel with `cancel.run_id`. A side question does
-not create a replacement assignment.
+not create a replacement assignment. For corrections to a completed candidate,
+use `task.revision` with concise findings and the exact returned producer
+identity. The [launch reference](../delegate-to-co-engineer/references/launch.md)
+lists its fields.
+Keep the original external provider/model and scope. A revision has a fresh
+identity and preserves prior evidence. Follow its returned revision run ID and
+cursor. It continues the assignment as fresh scoped work; do not use an old attention reply or
+replay an active/uncertain task. Return routine fixes to the external owner.
 
 For interrupted repository consent, reopen the actual host form on the same run
 with `run_reply.request_consent` set to true; this does not grant approval.
@@ -21,7 +29,7 @@ Unaffected assignments continue. Inspect the result and relevant checks before
 claiming verification; report any failure or unresolved work honestly.
 
 Read [existing-run details](references/existing-run.md) only for an unfamiliar
-reply or diagnostic operation. Raw lifecycle debugging uses
+revision, reply, or diagnostic operation. Raw lifecycle debugging uses
 `$control-codex-co-engineer-agents`. Never ask the user to construct tool payloads.
 
 For an explicitly requested legacy Luna/Sol relay, see [optional host relay](references/luna-pm-events.md). This is not required for ordinary delegation.
diff --git a/plugins/codex-co-engineer/skills/chat-with-co-engineer/references/existing-run.md b/plugins/codex-co-engineer/skills/chat-with-co-engineer/references/existing-run.md
index af85154..8cfa5f9 100644
--- a/plugins/codex-co-engineer/skills/chat-with-co-engineer/references/existing-run.md
+++ b/plugins/codex-co-engineer/skills/chat-with-co-engineer/references/existing-run.md
@@ -1,6 +1,9 @@
 # Existing-run procedures
 
-Read only the section that matches the current request. Chatting never starts a second bounded run. Keep the same run cursor and the same `decision_or_attention` wait.
+Read only the section that matches the current request. Chatting manages the
+existing assignment and never starts unrelated work. Ordinary waits and replies
+keep the same run ID, cursor, and `decision_or_attention` wait. A completed
+candidate correction uses the bounded revision operation below.
 
 ## Inspect or continue
 
@@ -12,6 +15,22 @@ User: Chatting with Co-Engineer: continue and tell me when you have checked the
 
 If the candidate is complete, inspect it, then say `Co-Engineer finished, and I verified the candidate. You still decide whether to keep, change, or discard it.` That sentence is not itself a merge. External workers may commit. A scoped publisher may non-force push only the task branch and open a draft pull request. The PR-ready card reports exact HEAD and tree bound to current evidence, cleanliness including any in-progress Git operation, accepted required lanes, the open draft pull request's repository and host identity, and either the legacy `ready_for_sol_merge` readiness result or the exact blockers. That compatibility field does not select a model or grant authority. Codex remains the merge authority and may merge only after exact-head, current-green-CI, verifier, and topology checks and the user's authorization. The user retains release, tag, version, protected-ref, and product-policy authority.
 
+## Correct a completed candidate
+
+Return bounded findings to the original external owner using `task.revision`.
+Send the producer `run_id` and a `revision` with `assignment_id`, concise
+`feedback`, `expected_head`, and `expected_idempotency_key`. Copy the exact
+identity from the public producer packet. The supervisor checks the current
+candidate, retains provider/model and scope, and derives fresh correction work.
+Follow the returned revision run ID and cursor. Preserve the producer evidence.
+The fixed limit is three correction rounds, with one admitted child per producer.
+Inspect an existing child instead of creating a sibling. An exhausted limit needs
+a deliberate decision about a new bounded assignment; do not auto-resubmit.
+This is a correction of existing work, not an unrelated replacement assignment.
+Use `run_reply` for pending questions or consent; it cannot fix a terminal task.
+Active, uncertain, uninspectable, or unfinished work must be reconciled first.
+See the [launch reference](../../delegate-to-co-engineer/references/launch.md).
+
 ## Grouped attention
 
 The run is already in its one coordinated wait. More than one assignment needs a choice. Group those questions into one decision. Unaffected assignments keep working.
@@ -39,3 +58,8 @@ If the user asks to chat and no run exists, say chatting needs existing work and
 ## Luna Max project manager
 
 If this run already has a pinned Luna Max thread, Codex calls send_message_to_thread and wait_threads on the bound threadId. A create_thread result with only clientThreadId is setup_pending; do not send or wait until the host supplies threadId and hostId. Wake it for completed, blocked, failed, question, timeout, or user_update. Routine progress does not wake it. A merge_ready envelope may wake Sol High or Sol XHigh once, and only when exact head and tree, verifier acceptance, current green CI, zero failed or hidden checks, and topology facts all pass. Do not invent cancel_thread. If create_thread, send_message_to_thread, and wait_threads or read_thread are missing, or Luna Max fails, stay in the current Codex task. I am not substituting Sol.
+
+Different feedback against a producer with an admitted child is rejected with
+that child's id and a statement that the feedback was not applied. Inspect the
+child before requesting its next correction. A pending durable reservation
+without a child receipt requires inspection; it never authorizes a replay.
diff --git a/plugins/codex-co-engineer/skills/delegate-to-co-engineer/SKILL.md b/plugins/codex-co-engineer/skills/delegate-to-co-engineer/SKILL.md
index 6dc84a3..8dc1d85 100644
--- a/plugins/codex-co-engineer/skills/delegate-to-co-engineer/SKILL.md
+++ b/plugins/codex-co-engineer/skills/delegate-to-co-engineer/SKILL.md
@@ -1,30 +1,50 @@
 ---
 name: delegate-to-co-engineer
-description: Start a new Co-Engineer run with up to eight independent assignments. Use for external delegation or several named providers; existing-run management and raw MCP debugging use their dedicated skills.
+description: Delegate complete implementation, investigation, or review assignments to authorized external co-engineers. Use for external capacity preferences and independent parallel work; use the chat skill to continue an existing assignment.
 ---
 
 # Delegating to Co-Engineer
 
 Give Codex a team of external co-engineers without giving up control.
-Codex remains chief engineer, reviewer, and merge authority. The supported shape
-is up to eight isolated external co-engineers, one bounded run, one coordinated wait, one verified decision.
+The supported shape is up to eight isolated external co-engineers, one bounded run, one coordinated wait, one verified decision.
+
+Give an external co-engineer ownership of a bounded result, including relevant
+preparation, implementation, meaningful checks, and requested corrections.
+Codex remains chief engineer, reviewer, and merge authority.
+
+When the user has authorized external work, delegate substantial independent
+assignments before doing their implementation or routine verification yourself.
+Use the user's provider preferences and available capabilities. If neither a named
+provider nor a valid preference resolves selection, ask once among Grok, Cursor,
+or Muse. Grok and Cursor
+can own engineering decisions within their assignment; do not limit them to
+mechanical edits or a second opinion. Keep tiny changes with the current owner
+when delegation would cost more than it saves. No additional manager is required.
 
 Read the short [launch path](references/launch.md) once, then reuse it.
-Reuse authorized provider choices; if missing, ask once among Grok, Cursor, or Muse.
-Keep several named providers in one run. Existing work uses
-`$chat-with-co-engineer`; raw lifecycle debugging uses
-`$control-codex-co-engineer-agents`.
-
-Use natural, concise updates. For example: `I am delegating this to Co-Engineer`.
-Describe preparation honestly; claim running only with authoritative dispatch.
-After inspecting a complete candidate, you may say
-`Co-Engineer finished, and I verified the candidate.` Report failures and gaps
-instead when work is incomplete. No fixed narration sequence is required.
-Never ask the user to construct tool payloads.
+Several named providers belong in one run with disjoint writers. A review of
+new code starts after its exact candidate exists. Wait for a decision or actual
+attention, and inspect concise results plus decisive evidence. Do not duplicate
+the worker's exploration, recreate machine receipts, or read routine logs while
+it works. Return bounded corrections to the same external owner.
 
-Read [model guidance](references/model-roles.md) only when choosing models is
-part of the task; a separate coordinator is optional.
+For large autonomous tasks or reducing Astra coordination cost, use the
+[ownership guide](references/autonomous-ownership.md). Read
+[model guidance](references/model-roles.md) only when model selection matters.
+Preserve explicit choices and host defaults; Co-Engineer does not change the
+Codex model or reasoning effort. Missing provider capacity is not permission to
+silently move the assignment into the native Codex pool.
 
-For an explicitly requested legacy Luna/Sol relay, see [optional host relay](references/luna-pm.md). This is not required for ordinary delegation.
+For an explicitly requested legacy Luna/Sol relay, see the
+[optional host relay](references/luna-pm.md). It is not a prerequisite.
+
+Use concise, truthful updates. Examples: `I am delegating this to Co-Engineer`;
+after actual verification, `Co-Engineer finished, and I verified the candidate.`
+No fixed narration sequence is required. Claim running only after authoritative dispatch.
+Provider completion is a candidate for review; unresolved required work prevents
+verified completion. Existing work uses `$chat-with-co-engineer`; unfamiliar
+runtime failures use `$control-codex-co-engineer-agents`.
+Never ask the user to construct tool payloads.
 
-External workers may commit within their assigned scope. Publication and merge require user authorization and Codex review.
+External workers may commit within their assigned scope.
+Publication and merge require user authorization and Codex review.
diff --git a/plugins/codex-co-engineer/skills/delegate-to-co-engineer/agents/openai.yaml b/plugins/codex-co-engineer/skills/delegate-to-co-engineer/agents/openai.yaml
index 8c05e8f..6f4d12a 100644
--- a/plugins/codex-co-engineer/skills/delegate-to-co-engineer/agents/openai.yaml
+++ b/plugins/codex-co-engineer/skills/delegate-to-co-engineer/agents/openai.yaml
@@ -1,7 +1,7 @@
 interface:
   display_name: "Delegating to Co-Engineer"
-  short_description: "Start one bounded Co-Engineer run"
-  default_prompt: "Use $delegate-to-co-engineer to launch the requested work with existing provider choices, one semantic submission, and one coordinated wait."
+  short_description: "Delegate a complete engineering assignment"
+  default_prompt: "Use $delegate-to-co-engineer to give the complete bounded assignment to an authorized external owner, preserve provider preferences, and return a concise candidate for review."
 dependencies:
   tools:
     - type: "mcp"
diff --git a/plugins/codex-co-engineer/skills/delegate-to-co-engineer/references/autonomous-ownership.md b/plugins/codex-co-engineer/skills/delegate-to-co-engineer/references/autonomous-ownership.md
new file mode 100644
index 0000000..7397796
--- /dev/null
+++ b/plugins/codex-co-engineer/skills/delegate-to-co-engineer/references/autonomous-ownership.md
@@ -0,0 +1,91 @@
+# Autonomous ownership and Astra coordination
+
+Optimize for an accepted result with less total coordinator work. Provider
+invocation counts and busy time are not evidence of savings. This contract works
+with any capable host agent; Astra-specific advice concerns its observed
+delegation and verification behavior, not a fixed model hierarchy.
+
+## Assign an outcome
+
+Give the external owner the objective, relevant inputs, owned paths, acceptance
+criteria, and a realistic bounded duration that includes checks and corrections.
+Let it choose implementation details. Prefer one coherent result over repeated
+micro-assignments that make the coordinator rebuild context after every commit.
+Break up work when dependencies or ownership require it, not to prescribe every
+tool call. Never dispatch a dependent review against the implementation's base.
+
+Reuse the caller’s explicit `run_request.preferences` by role on each eligible
+request. Assignment `provider` and `model` values take priority. Preferences do
+not create a global settings store. Spare Grok/Cursor capacity should
+affect assignment ownership when the user requests that objective. Readiness is
+not a subscription balance, and Cursor Cloud API usage is not assumed to consume
+the same allowance as Cursor Local. Unknown usage stays unknown. Never replay
+an active or uncertain prompt to move work to another provider.
+
+## Keep the coordinator on decisions
+
+The coordinator defines ambiguous requirements, resolves substantive reviewer
+disagreement, checks the final candidate, and owns integration/release decisions.
+Workers own their exploration, implementation, meaningful tests, and fixes.
+An independent external reviewer may check code, reproduce decisive tests, and
+report findings; required final host or domain review still applies.
+
+Machine identity, timestamps, command results, artifact hashes, and lifecycle
+receipts come from tooling. Read their compact projection and follow the exact
+artifact reference only for a concrete concern. Do not write a new script merely
+to copy these facts between receipts. Scientific interpretation and acceptance
+judgment remain explicit decisions; a provider's PASS string is not verification.
+
+Send feedback as a bounded finding list tied to the reviewed head. Use the
+supported revision operation and its returned identity/action rather than
+reconstructing a launch from memory. A terminal revision is new scoped work,
+not a replay or an answer to an old attention question. It preserves provider,
+model, ownership, repository authorization, and immutable previous evidence.
+The child is a fresh correction workspace already at the reviewed commit.
+Implementation and commits stay in that assigned working directory. Original
+run, assignment, and repository paths are lineage and reference, not
+navigation. Inspect pwd and Git identity and report a mismatch instead of
+seeking the producer worktree. The correction chain permits three rounds and
+one admitted child per producer. Follow the returned child; an exhausted or
+failed loop needs an explicit decision about a new bounded assignment. Do not
+branch the original producer repeatedly.
+Read `result_evidence` for the outcome and use diagnostics only when the detailed
+usage or unresolved evidence affects the decision. Its usage covers this run,
+so include earlier attempts and native helpers when comparing the whole outcome.
+
+## Wait without manufacturing work
+
+Use one run cursor and `decision_or_attention`. Persist the returned identities
+and reconnect to the same run after a host timeout. Routine progress does not
+need repeated status or diagnostics. Perform genuinely independent useful work
+while waiting; otherwise wait. Do not rerun the producer's entire exploration
+to keep the host busy. Escalate a substantive decision, an authorization gap,
+unresolved failure, or repeated unsuccessful correction.
+
+## Astra and host capability boundaries
+
+OpenAI's [Astra guidance](https://developers.openai.com/api/docs/guides/latest-model)
+notes that delegation may need explicit instructions and testing may grow beyond
+the change. Set ownership before implementation and use decisive checks at the
+candidate boundary. Broaden verification when a failure or concrete unresolved
+risk warrants it. Keep required repository/release checks.
+
+Async tools, mid-turn steering, and cache-preserving reasoning updates are host
+capabilities. An MCP field cannot enable them in Codex Desktop. Use advertised
+host support when present; retain durable waits and replies otherwise. Avoid
+rewriting large prompt prefixes for routine state changes. Do not alter global
+model, reasoning, context, compaction, or experimental settings as an optimization.
+
+## Evaluate the result
+
+Compare similar accepted assignments using parent plus native-child response
+tokens, model-facing bytes, coordinator actions, correction rounds, decisive
+review outcomes, and elapsed time. Record why external capacity was idle where
+that fact is known. Separate dependency waits from provider failures. Do not
+invent provider token counts, exact balances, or an expected percentage saving.
+Fewer native tokens with missed defects is not a successful optimization.
+
+Different feedback against a producer with an admitted child is rejected with
+that child's id and a statement that the feedback was not applied. Inspect the
+child before requesting its next correction. A pending durable reservation
+without a child receipt requires inspection; it never authorizes a replay.
diff --git a/plugins/codex-co-engineer/skills/delegate-to-co-engineer/references/launch.md b/plugins/codex-co-engineer/skills/delegate-to-co-engineer/references/launch.md
index a329852..5d1bc75 100644
--- a/plugins/codex-co-engineer/skills/delegate-to-co-engineer/references/launch.md
+++ b/plugins/codex-co-engineer/skills/delegate-to-co-engineer/references/launch.md
@@ -2,19 +2,29 @@
 
 Submit `delegate.run_request` once: a stable `run_id`, absolute Git `repo`,
 `objective`, and one to eight `assignments`. Each assignment needs an
-`assignment_id`, chosen `provider`, `role`, and `prompt`. Optional
+`assignment_id`, `role`, and `prompt`, plus either a chosen `provider` or a
+matching explicit role preference. Optional
 `expected_duration_ms` defaults to ten minutes, with the existing 20% deadline
 margin; supply an estimate when the task needs a different duration.
 State the requested output, allowed changes, tests and brief relevant evidence
 in the prompt. Preserve repository instructions and required verification, but
 do not ask the provider to duplicate machine-generated lifecycle or handoff receipts.
-Reuse existing provider/model choices. Model overrides are optional.
+Reuse existing provider/model choices and supported provider preferences.
+Delegate the complete bounded result, including its tests and corrections;
+model overrides are optional. Preserve exact explicit selections.
 The controller creates managed worktrees; the worker wrapper verifies them and
 owns the writer lock and lifecycle. Do not ask the provider to reconstruct that
 harness setup or supply its hidden writer token. The server derives identities
 and defaults; do not construct the legacy full `run` envelope. Multiple writers
 need disjoint `write_scope` paths. Dependent review starts after its input exists.
 
+Use `run_request.preferences` to reuse the user's choices by role, for example
+`{"implement":{"provider":"grok"},"review":{"provider":"cursor-local"}}`.
+Assignment `provider` and `model` values take priority over matching preferences.
+Preferences select owners for the supplied assignments; they do not create
+dependent work or measure remaining subscription capacity. They are part of the
+request, not a global Codex setting or a repository consent grant.
+
 Keep the returned run ID and same run cursor. Wait through `task` with
 `wait_until` set to `decision_or_attention`. Preparation and pending acknowledgement
 are active work. On timeout or disconnect, reconnect to the same run; never replay
@@ -24,8 +34,16 @@ Repository exposure uses the host's actual consent form. If interrupted, reopen
 it with `task.run_reply.request_consent` on the same run. Never invent approval.
 Answer actionable input through the returned reply identity. Unaffected work continues.
 
-Inspect results, changes and checks before accepting them. Required failures,
-uncertainty or unfinished cleanup block a verified result. Retrieve diagnostics
+Inspect the returned candidate, concise handoff and decisive checks before
+accepting it. Return a bounded correction to its external owner through the
+supported revision action; do not rebuild its worktree, prompt or machine
+receipts by hand. A new scoped revision must preserve its predecessor evidence.
+Call `task` with the producer `run_id` and `revision` containing
+`assignment_id`, `feedback`, `expected_head`, and `expected_idempotency_key`.
+Copy the exact identity fields from the returned producer evidence. Follow the
+new run ID and cursor; identical correction inputs must not dispatch twice.
+Use `run_reply` only for actual pending questions or consent, not terminal fixes.
+Required failures, uncertainty or unfinished cleanup block a verified result. Retrieve diagnostics
 only for a concrete gap; use artifact references for omitted detail.
 
 Admission checks readiness. Run compact `status` only to resolve an actual
diff --git a/plugins/codex-co-engineer/skills/delegate-to-co-engineer/references/model-roles.md b/plugins/codex-co-engineer/skills/delegate-to-co-engineer/references/model-roles.md
index b43f207..a55adba 100644
--- a/plugins/codex-co-engineer/skills/delegate-to-co-engineer/references/model-roles.md
+++ b/plugins/codex-co-engineer/skills/delegate-to-co-engineer/references/model-roles.md
@@ -5,6 +5,15 @@ independent assignments when their benefit exceeds coordination overhead.
 Co-Engineer delegates to external providers; native model selection and
 reasoning effort belong to the host. Preserve user choices and stock defaults.
 
+## Provider ownership comes first
+
+When the user wants to use available external capacity, keep implementation,
+technical review, and corrections with authorized Grok/Cursor/Muse owners where
+their capabilities fit. A cheaper native agent still draws on the native pool;
+adding a Luna/Sol relay does not by itself meet that objective. Keep final host
+review and genuine escalation decisions with the host. See the
+[autonomous ownership guide](autonomous-ownership.md).
+
 ## Practical task ladder
 
 These job titles and effort thresholds are workflow heuristics, not official
diff --git a/plugins/codex-co-engineer/test/acpx-fake-agent.mjs b/plugins/codex-co-engineer/test/acpx-fake-agent.mjs
index 639b0e2..1fcfd9a 100644
--- a/plugins/codex-co-engineer/test/acpx-fake-agent.mjs
+++ b/plugins/codex-co-engineer/test/acpx-fake-agent.mjs
@@ -26,6 +26,8 @@ const pendingPrompts = new Map();
 let nextId = 1;
 let descendant = null;
 
+await writeFile(join(process.cwd(), '.acpx-fake-agent.pid'), `${process.pid}\n`, { mode: 0o600 });
+
 function send(message) {
   process.stdout.write(`${JSON.stringify(message)}\n`);
 }
diff --git a/plugins/codex-co-engineer/test/acpx-runtime.test.mjs b/plugins/codex-co-engineer/test/acpx-runtime.test.mjs
index 1e3ca06..c561fd7 100644
--- a/plugins/codex-co-engineer/test/acpx-runtime.test.mjs
+++ b/plugins/codex-co-engineer/test/acpx-runtime.test.mjs
@@ -1,6 +1,6 @@
 import assert from 'node:assert/strict';
 import { readFileSync } from 'node:fs';
-import { mkdtemp, mkdir, readFile } from 'node:fs/promises';
+import { mkdtemp, mkdir, readFile, writeFile } from 'node:fs/promises';
 import { tmpdir } from 'node:os';
 import path from 'node:path';
 import test from 'node:test';
@@ -107,12 +107,120 @@ test('bounds the queued ACP events instead of retaining unbounded output', async
   }
 });
 
+test('retains the persistent ACP client before turn result settles', async () => {
+  const value = await fixture('normal', 3_000);
+  let descendantPid;
+  let agentPid;
+  let closed = false;
+  try {
+    const manager = await value.runtime.getManager();
+    const turn = value.runtime.startTurn({
+      handle: value.handle,
+      text: 'hostile-descendant',
+      mode: 'prompt',
+      requestId: 'retain-before-result',
+      timeoutMs: 3_000,
+    });
+    const result = await turn.result;
+    // Same synchronous continuation as turn.result: any await here lets
+    // finalize populate pendingPersistentClients and hides the ordering gap.
+    // Capture PIDs with readFileSync first so finally can reap on assert failure.
+    agentPid = Number(readFileSync(path.join(value.cwd, '.acpx-fake-agent.pid'), 'utf8'));
+    descendantPid = Number(readFileSync(path.join(value.cwd, '.acpx-fake-descendant.pid'), 'utf8'));
+    assert.equal(
+      manager.pendingPersistentClients.has(value.handle.acpxRecordId),
+      true,
+      'persistent client must be retained before turn.result resolves',
+    );
+    assert.equal(result.status, 'completed');
+    assert.ok(processAlive(agentPid), 'fixture agent should still be running after retain');
+    assert.ok(processAlive(descendantPid), 'fixture descendant should still be running after retain');
+    await value.runtime.close({ handle: value.handle, reason: 'test_cleanup' });
+    closed = true;
+    assert.equal(await waitForProcessExit(agentPid, 1_000), true);
+    assert.equal(await waitForProcessExit(descendantPid), true);
+  } finally {
+    if (!closed) await value.runtime.close({ handle: value.handle, reason: 'test_cleanup' }).catch(() => {});
+    for (const pid of [descendantPid, agentPid]) {
+      if (pid && processAlive(pid)) {
+        try { process.kill(pid, 'SIGKILL'); } catch {}
+      }
+    }
+  }
+});
+
+test('close during finalization cannot retain a live client or reopen its record', { timeout: 20_000 }, async () => {
+  const value = await fixture('ask-user-unsupported', 8_000);
+  const manager = await value.runtime.getManager();
+  const originalFinalize = manager.finalizeRuntimeTurn;
+  const originalRefresh = manager.refreshClosedState;
+  let finalizing = false;
+  let paused = false;
+  let release;
+  let reached;
+  let timer;
+  let agentPid;
+  const barrier = new Promise((resolve) => { release = resolve; });
+  const entered = new Promise((resolve) => { reached = resolve; });
+  const deadline = new Promise((_, reject) => {
+    timer = setTimeout(() => reject(new Error('close/finalization regression exceeded 15 seconds')), 15_000);
+  });
+  manager.finalizeRuntimeTurn = function (...args) {
+    finalizing = true;
+    return originalFinalize.apply(this, args);
+  };
+  manager.refreshClosedState = async function (record) {
+    const closed = await originalRefresh.call(this, record);
+    if (finalizing && !paused && !closed) {
+      paused = true;
+      reached();
+      await barrier;
+    }
+    return closed;
+  };
+  try {
+    const turn = value.runtime.startTurn({
+      handle: value.handle,
+      text: 'ask-user-unsupported',
+      mode: 'prompt',
+      requestId: 'close-during-finalization',
+      timeoutMs: 8_000,
+    });
+    const events = (async () => { for await (const _event of turn.events) {} })();
+    await Promise.race([entered, deadline]);
+    agentPid = Number(readFileSync(path.join(value.cwd, '.acpx-fake-agent.pid'), 'utf8'));
+    // Hold finalization after its closed-state check, then complete a real
+    // close before allowing finalization to save/retain the same client.
+    await Promise.race([value.runtime.close({ handle: value.handle, reason: 'test_close_during_finalize' }), deadline]);
+    release();
+    const [result] = await Promise.race([Promise.all([turn.result, events]), deadline]);
+    const record = await manager.options.sessionStore.load(value.handle.acpxRecordId);
+    assert.deepEqual({
+      status: result.status,
+      retained: manager.pendingPersistentClients.has(value.handle.acpxRecordId),
+      agentAlive: processAlive(agentPid),
+      storedClosed: record.closed === true,
+    }, { status: 'completed', retained: false, agentAlive: false, storedClosed: true });
+  } finally {
+    release();
+    manager.finalizeRuntimeTurn = originalFinalize;
+    manager.refreshClosedState = originalRefresh;
+    clearTimeout(timer);
+    await value.runtime.close({ handle: value.handle, reason: 'test_cleanup' }).catch(() => {});
+    if (agentPid && processAlive(agentPid)) {
+      try { process.kill(agentPid, 'SIGKILL'); } catch {}
+    }
+  }
+});
+
 test('kills hostile detached ACP descendants during runtime close', async () => {
   const value = await fixture('normal', 3_000);
   let descendantPid;
+  let agentPid;
   let closed = false;
   const originalPath = process.env.PATH;
   try {
+    const manager = await value.runtime.getManager();
     const turn = value.runtime.startTurn({
       handle: value.handle,
       text: 'hostile-descendant',
@@ -122,19 +230,30 @@ test('kills hostile detached ACP descendants during runtime close', async () =>
     });
     const result = await turn.result;
     assert.equal(result.status, 'completed');
+    agentPid = Number(await readFile(path.join(value.cwd, '.acpx-fake-agent.pid'), 'utf8'));
     descendantPid = Number(await readFile(path.join(value.cwd, '.acpx-fake-descendant.pid'), 'utf8'));
+    assert.ok(
+      manager.pendingPersistentClients.has(value.handle.acpxRecordId),
+      'close must observe the retained persistent client',
+    );
+    assert.ok(processAlive(agentPid), 'fixture agent should still be running before close');
     assert.ok(processAlive(descendantPid), 'fixture descendant should still be running before close');
     // Linux cleanup must not depend on an external process-list command.
     if (process.platform === 'linux') process.env.PATH = path.join(value.root, 'no-process-list-command');
     await value.runtime.close({ handle: value.handle, reason: 'test_cleanup' });
     closed = true;
     assert.equal(await waitForProcessExit(descendantPid), true);
+    assert.equal(await waitForProcessExit(agentPid, 1_000), true);
   } finally {
     if (originalPath === undefined) delete process.env.PATH;
     else process.env.PATH = originalPath;
     if (!closed) await value.runtime.close({ handle: value.handle, reason: 'test_cleanup' }).catch(() => {});
-    if (descendantPid && processAlive(descendantPid)) {
-      try { process.kill(descendantPid, 'SIGKILL'); } catch {}
+    // Leave no fixture children even when assertions fail; otherwise the Node
+    // test worker stays alive on the unreaped ACP agent and hangs the suite.
+    for (const pid of [descendantPid, agentPid]) {
+      if (pid && processAlive(pid)) {
+        try { process.kill(pid, 'SIGKILL'); } catch {}
+      }
     }
   }
 });
@@ -159,3 +278,434 @@ test('turn timeout settles and runtime close leaves no ACP child', async () => {
     await value.runtime.close({ handle: value.handle, reason: 'test_cleanup' }).catch(() => {});
   }
 });
+
+test('partial agent reply before a fixed turn timeout is not completed', async () => {
+  const root = await mkdtemp(path.join(tmpdir(), 'co-engineer-acpx-partial-timeout-'));
+  const cwd = path.join(root, 'worktree');
+  const stateDir = path.join(root, 'state');
+  await mkdir(cwd);
+  await mkdir(stateDir);
+  const agentPath = path.join(root, 'partial-timeout-agent.mjs');
+  await writeFile(agentPath, `import { createInterface } from 'node:readline';
+function send(message) { process.stdout.write(JSON.stringify(message) + '\\n'); }
+function response(id, result) { send({ jsonrpc: '2.0', id, result }); }
+async function handle(message) {
+  const { id, method, params = {} } = message;
+  if (method === 'initialize') {
+    return response(id, {
+      protocolVersion: 1,
+      agentCapabilities: { loadSession: false, sessionCapabilities: { close: {} } },
+    });
+  }
+  if (method === 'notifications/initialized' || method === 'initialized') return;
+  if (method === 'session/new') return response(id, { sessionId: 'partial-timeout-session' });
+  if (method === 'session/close') return response(id, {});
+  if (method === 'session/cancel') return;
+  if (method === 'session/prompt') {
+    send({
+      jsonrpc: '2.0',
+      method: 'session/update',
+      params: {
+        sessionId: params.sessionId,
+        update: {
+          sessionUpdate: 'agent_message_chunk',
+          content: { type: 'text', text: 'partial-before-timeout' },
+        },
+      },
+    });
+  }
+}
+const input = createInterface({ input: process.stdin, crlfDelay: Infinity, terminal: false });
+process.stdin.resume();
+input.on('line', (line) => { try { handle(JSON.parse(line)); } catch {} });
+process.once('SIGTERM', () => process.exit(0));
+`);
+  const runtime = createAcpRuntime({
+    cwd,
+    sessionStore: createRuntimeStore({ stateDir }),
+    agentRegistry: createAgentRegistry({
+      overrides: { grok: [process.execPath, agentPath] },
+    }),
+    mcpServers: [],
+    permissionMode: 'approve-all',
+    timeoutMs: 2_000,
+  });
+  const handle = await runtime.ensureSession({
+    sessionKey: 'partial-timeout',
+    agent: 'grok',
+    mode: 'persistent',
+    cwd,
+  });
+  try {
+    const turn = runtime.startTurn({
+      handle,
+      text: 'partial then hang',
+      mode: 'prompt',
+      requestId: 'partial-timeout',
+      timeoutMs: 400,
+    });
+    const chunks = [];
+    for await (const event of turn.events) {
+      if (event?.type === 'text_delta' && typeof event.text === 'string') chunks.push(event.text);
+    }
+    const result = await Promise.race([
+      turn.result,
+      delay(3_000).then(() => { throw new Error('partial timeout did not settle'); }),
+    ]);
+    assert.equal(result.status, 'failed');
+    assert.notEqual(result.status, 'completed');
+    assert.notEqual(result.stopReason, 'end_turn');
+    assert.deepEqual(chunks, ['partial-before-timeout']);
+  } finally {
+    await runtime.close({ handle, reason: 'test_cleanup' }).catch(() => {});
+  }
+});
+
+test('turn AbortSignal owns cancellation when the fixed turn timeout is disabled', async () => {
+  const root = await mkdtemp(path.join(tmpdir(), 'co-engineer-acpx-signal-cancel-'));
+  const cwd = path.join(root, 'worktree');
+  const stateDir = path.join(root, 'state');
+  await mkdir(cwd);
+  await mkdir(stateDir);
+  const agentPath = path.join(root, 'signal-cancel-agent.mjs');
+  await writeFile(agentPath, `import { createInterface } from 'node:readline';
+function send(message) { process.stdout.write(JSON.stringify(message) + '\\n'); }
+function response(id, result) { send({ jsonrpc: '2.0', id, result }); }
+const pending = new Map();
+async function handle(message) {
+  const { id, method, params = {} } = message;
+  if (method === 'initialize') {
+    return response(id, {
+      protocolVersion: 1,
+      agentCapabilities: { loadSession: false, sessionCapabilities: { close: {} } },
+    });
+  }
+  if (method === 'notifications/initialized' || method === 'initialized') return;
+  if (method === 'session/new') return response(id, { sessionId: 'signal-cancel-session' });
+  if (method === 'session/close') return response(id, {});
+  if (method === 'session/cancel') {
+    for (const [promptId] of pending) {
+      response(promptId, { stopReason: 'cancelled' });
+      pending.delete(promptId);
+    }
+    return;
+  }
+  if (method === 'session/prompt') {
+    send({
+      jsonrpc: '2.0',
+      method: 'session/update',
+      params: {
+        sessionId: params.sessionId,
+        update: {
+          sessionUpdate: 'agent_message_chunk',
+          content: { type: 'text', text: 'waiting-for-cancel' },
+        },
+      },
+    });
+    pending.set(id, params.sessionId);
+  }
+}
+const input = createInterface({ input: process.stdin, crlfDelay: Infinity, terminal: false });
+process.stdin.resume();
+input.on('line', (line) => { try { handle(JSON.parse(line)); } catch {} });
+process.once('SIGTERM', () => process.exit(0));
+`);
+  const runtime = createAcpRuntime({
+    cwd,
+    sessionStore: createRuntimeStore({ stateDir }),
+    agentRegistry: createAgentRegistry({
+      overrides: { grok: [process.execPath, agentPath] },
+    }),
+    mcpServers: [],
+    permissionMode: 'approve-all',
+    timeoutMs: 5_000,
+  });
+  const handle = await runtime.ensureSession({
+    sessionKey: 'signal-cancel',
+    agent: 'grok',
+    mode: 'persistent',
+    cwd,
+  });
+  try {
+    const controller = new AbortController();
+    const turn = runtime.startTurn({
+      handle,
+      text: 'hold open for signal cancel',
+      mode: 'prompt',
+      requestId: 'signal-owned-cancel',
+      timeoutMs: 0,
+      signal: controller.signal,
+    });
+    const events = (async () => {
+      for await (const _event of turn.events) {
+        // Drain so close is not blocked on an open iterator.
+      }
+    })();
+    await delay(100);
+    controller.abort();
+    const result = await Promise.race([
+      turn.result,
+      delay(3_000).then(() => { throw new Error('signal-owned cancel did not settle'); }),
+    ]);
+    await events;
+    assert.equal(result.status, 'cancelled');
+    assert.equal(result.stopReason, 'cancelled');
+  } finally {
+    await runtime.close({ handle, reason: 'test_cleanup' }).catch(() => {});
+  }
+});
+
+test('concurrent turns isolate AbortSignals across two active sessions', async () => {
+  const root = await mkdtemp(path.join(tmpdir(), 'co-engineer-acpx-signal-isolation-'));
+  const cwd = path.join(root, 'worktree');
+  const stateDir = path.join(root, 'state');
+  await mkdir(cwd);
+  await mkdir(stateDir);
+  const agentPath = path.join(root, 'signal-isolation-agent.mjs');
+  await writeFile(agentPath, `import { createInterface } from 'node:readline';
+function send(message) { process.stdout.write(JSON.stringify(message) + '\\n'); }
+function response(id, result) { send({ jsonrpc: '2.0', id, result }); }
+function promptText(params) {
+  const block = params?.prompt?.[0];
+  return typeof block?.text === 'string' ? block.text : '';
+}
+const pending = new Map();
+async function handle(message) {
+  const { id, method, params = {} } = message;
+  if (method === 'initialize') {
+    return response(id, {
+      protocolVersion: 1,
+      agentCapabilities: { loadSession: false, sessionCapabilities: { close: {} } },
+    });
+  }
+  if (method === 'notifications/initialized' || method === 'initialized') return;
+  if (method === 'session/new') {
+    return response(id, { sessionId: 'iso-' + Math.random().toString(16).slice(2) });
+  }
+  if (method === 'session/close') return response(id, {});
+  if (method === 'session/cancel') {
+    for (const [promptId] of pending) {
+      response(promptId, { stopReason: 'cancelled' });
+      pending.delete(promptId);
+    }
+    return;
+  }
+  if (method === 'session/prompt') {
+    const text = promptText(params);
+    send({
+      jsonrpc: '2.0',
+      method: 'session/update',
+      params: {
+        sessionId: params.sessionId,
+        update: {
+          sessionUpdate: 'agent_message_chunk',
+          content: { type: 'text', text: text.includes('complete-me') ? 'session-b-live' : 'session-a-hold' },
+        },
+      },
+    });
+    if (text.includes('complete-me')) {
+      setTimeout(() => response(id, { stopReason: 'end_turn' }), 400);
+      return;
+    }
+    pending.set(id, params.sessionId);
+  }
+}
+const input = createInterface({ input: process.stdin, crlfDelay: Infinity, terminal: false });
+process.stdin.resume();
+input.on('line', (line) => { try { handle(JSON.parse(line)); } catch {} });
+process.once('SIGTERM', () => process.exit(0));
+`);
+  const runtime = createAcpRuntime({
+    cwd,
+    sessionStore: createRuntimeStore({ stateDir }),
+    agentRegistry: createAgentRegistry({
+      overrides: { grok: [process.execPath, agentPath] },
+    }),
+    mcpServers: [],
+    permissionMode: 'approve-all',
+    timeoutMs: 5_000,
+  });
+  const handleA = await runtime.ensureSession({
+    sessionKey: 'signal-iso-a',
+    agent: 'grok',
+    mode: 'persistent',
+    cwd,
+  });
+  const handleB = await runtime.ensureSession({
+    sessionKey: 'signal-iso-b',
+    agent: 'grok',
+    mode: 'persistent',
+    cwd,
+  });
+  const controllerA = new AbortController();
+  const controllerB = new AbortController();
+  const unhandled = [];
+  const onUnhandled = (reason) => {
+    unhandled.push(reason);
+  };
+  process.on('unhandledRejection', onUnhandled);
+  try {
+    const turnA = runtime.startTurn({
+      handle: handleA,
+      text: 'cancel-me',
+      mode: 'prompt',
+      requestId: 'iso-a',
+      timeoutMs: 0,
+      signal: controllerA.signal,
+    });
+    const turnB = runtime.startTurn({
+      handle: handleB,
+      text: 'complete-me',
+      mode: 'prompt',
+      requestId: 'iso-b',
+      timeoutMs: 0,
+      signal: controllerB.signal,
+    });
+    const drain = async (turn) => {
+      for await (const _event of turn.events) {
+        // Drain so close is not blocked on an open iterator.
+      }
+    };
+    const drainA = drain(turnA);
+    const drainB = drain(turnB);
+    await delay(100);
+    controllerA.abort();
+    const [resultA, resultB] = await Promise.all([
+      Promise.race([
+        turnA.result,
+        delay(3_000).then(() => { throw new Error('session A cancel did not settle'); }),
+      ]),
+      Promise.race([
+        turnB.result,
+        delay(3_000).then(() => { throw new Error('session B turn did not settle'); }),
+      ]),
+    ]);
+    await Promise.all([drainA, drainB]);
+    assert.equal(resultA.status, 'cancelled');
+    assert.equal(resultA.stopReason, 'cancelled');
+    assert.equal(resultB.status, 'completed');
+    assert.equal(resultB.stopReason, 'end_turn');
+    assert.equal(controllerB.signal.aborted, false);
+    assert.deepEqual(unhandled, []);
+  } finally {
+    process.off('unhandledRejection', onUnhandled);
+    await runtime.close({ handle: handleA, reason: 'test_cleanup' }).catch(() => {});
+    await runtime.close({ handle: handleB, reason: 'test_cleanup' }).catch(() => {});
+  }
+});
+
+test('pre-aborted signal and hostile late prompt settlement stay closed', async () => {
+  const root = await mkdtemp(path.join(tmpdir(), 'co-engineer-acpx-hostile-settle-'));
+  const cwd = path.join(root, 'worktree');
+  const stateDir = path.join(root, 'state');
+  await mkdir(cwd);
+  await mkdir(stateDir);
+  const agentPath = path.join(root, 'hostile-settle-agent.mjs');
+  await writeFile(agentPath, `import { createInterface } from 'node:readline';
+function send(message) { process.stdout.write(JSON.stringify(message) + '\\n'); }
+function response(id, result) { send({ jsonrpc: '2.0', id, result }); }
+async function handle(message) {
+  const { id, method, params = {} } = message;
+  if (method === 'initialize') {
+    return response(id, {
+      protocolVersion: 1,
+      agentCapabilities: { loadSession: false, sessionCapabilities: { close: {} } },
+    });
+  }
+  if (method === 'notifications/initialized' || method === 'initialized') return;
+  if (method === 'session/new') return response(id, { sessionId: 'hostile-settle-session' });
+  if (method === 'session/close') return response(id, {});
+  if (method === 'session/cancel') return; // hostile: ignore cancel
+  if (method === 'session/prompt') {
+    send({
+      jsonrpc: '2.0',
+      method: 'session/update',
+      params: {
+        sessionId: params.sessionId,
+        update: {
+          sessionUpdate: 'agent_message_chunk',
+          content: { type: 'text', text: 'hostile-partial' },
+        },
+      },
+    });
+    setTimeout(() => response(id, { stopReason: 'end_turn' }), 600);
+  }
+}
+const input = createInterface({ input: process.stdin, crlfDelay: Infinity, terminal: false });
+process.stdin.resume();
+input.on('line', (line) => { try { handle(JSON.parse(line)); } catch {} });
+process.once('SIGTERM', () => process.exit(0));
+`);
+  const runtime = createAcpRuntime({
+    cwd,
+    sessionStore: createRuntimeStore({ stateDir }),
+    agentRegistry: createAgentRegistry({
+      overrides: { grok: [process.execPath, agentPath] },
+    }),
+    mcpServers: [],
+    permissionMode: 'approve-all',
+    timeoutMs: 5_000,
+  });
+
+  const preAborted = new AbortController();
+  preAborted.abort();
+  const preHandle = await runtime.ensureSession({
+    sessionKey: 'hostile-preabort',
+    agent: 'grok',
+    mode: 'persistent',
+    cwd,
+  });
+  const preTurn = runtime.startTurn({
+    handle: preHandle,
+    text: 'already aborted',
+    mode: 'prompt',
+    requestId: 'preabort',
+    timeoutMs: 0,
+    signal: preAborted.signal,
+  });
+  for await (const _event of preTurn.events) {}
+  const preResult = await preTurn.result;
+  assert.equal(preResult.status, 'cancelled');
+  await runtime.close({ handle: preHandle, reason: 'test_cleanup' }).catch(() => {});
+
+  const handle = await runtime.ensureSession({
+    sessionKey: 'hostile-late-settle',
+    agent: 'grok',
+    mode: 'persistent',
+    cwd,
+  });
+  const controller = new AbortController();
+  const unhandled = [];
+  const onUnhandled = (reason) => {
+    unhandled.push(reason);
+  };
+  process.on('unhandledRejection', onUnhandled);
+  try {
+    const turn = runtime.startTurn({
+      handle,
+      text: 'hostile ignore cancel then settle',
+      mode: 'prompt',
+      requestId: 'hostile-late',
+      timeoutMs: 0,
+      signal: controller.signal,
+    });
+    const events = (async () => {
+      for await (const _event of turn.events) {}
+    })();
+    await delay(100);
+    controller.abort();
+    const result = await Promise.race([
+      turn.result,
+      delay(3_000).then(() => { throw new Error('hostile cancel did not settle'); }),
+    ]);
+    await events;
+    await delay(700);
+    assert.equal(result.status, 'cancelled');
+    assert.equal(result.stopReason, 'cancelled');
+    assert.notEqual(result.status, 'completed');
+    assert.deepEqual(unhandled, []);
+  } finally {
+    process.off('unhandledRejection', onUnhandled);
+    await runtime.close({ handle, reason: 'test_cleanup' }).catch(() => {});
+  }
+});
diff --git a/plugins/codex-co-engineer/test/admission-result-evidence.test.mjs b/plugins/codex-co-engineer/test/admission-result-evidence.test.mjs
new file mode 100644
index 0000000..859775e
--- /dev/null
+++ b/plugins/codex-co-engineer/test/admission-result-evidence.test.mjs
@@ -0,0 +1,185 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { projectAdmissionUsageLedgerV1 } from '../mcp/v3/admission-usage.mjs';
+import { createRunAdmissionRuntime } from '../mcp/v3/run-admission.mjs';
+import { compileRunRequestV1 } from '../mcp/v3/run-request-compiler.mjs';
+import { createRunToolAdapter, SIMPLE_RUN_STATUS_STRUCTURED_BYTES_MAX } from '../mcp/v3/run-tool-adapter.mjs';
+import { createAdapter } from './fixtures/r1-run-tool-adapter-fixtures.mjs';
+
+const base = 'a'.repeat(40);
+const head = 'b'.repeat(40);
+const timestamp = '2026-09-10T10:00:00.000Z';
+
+function harness(providerResult = 'Provider says PASS. Private /home/test-user/source omitted from shareable report.') {
+  const records = new Map();
+  let saves = 0;
+  const dependencies = {
+    compile: request => compileRunRequestV1(request, {
+      observeGit: async () => ({ base_sha: base, head_sha: base, tree_sha: 'c'.repeat(40),
+        branch: 'main', clean: true, remote_present: true, remote_count: 1 }),
+    }),
+    clock: () => timestamp,
+    requestConsent: async () => ({ approved: true }),
+    providerReady: async () => ({ ready: true }),
+    processBoundaryReady: async () => ({ ready: true }),
+    verifyRepository: async () => ({ verified: true }),
+    prepareWorkspace: async ({ assignment }) => ({ prepared: true, workspace: {
+      worktree_path: `/private/${assignment.assignment_id}`, branch: 'candidate', start_sha: base,
+    } }),
+    createSession: async () => ({ ready: true, session_id: 'session' }),
+    dispatchPrompt: async () => ({ dispatched: true, confidence: 'authoritative' }),
+    inspectLane: async () => ({ status: 'completed', result: providerResult }),
+    inspectWorkspace: async () => ({ current_head: head, clean: true, changed_files: [], commits: [head] }),
+    verifyRun: async () => ({ verified: true }),
+    persistRecord: async record => { records.set(record.run_id, JSON.parse(JSON.stringify(record))); saves += 1; },
+    loadRecord: async runId => records.has(runId) ? structuredClone(records.get(runId)) : null,
+  };
+  function adapter() {
+    return createRunToolAdapter({
+      runtime: createAdapter().runtime,
+      simpleRuntime: createRunAdmissionRuntime(dependencies),
+    });
+  }
+  return { adapter, saves: () => saves };
+}
+
+function metric(report, key) {
+  return report.usage.metrics.find(row => row.key === key);
+}
+
+test('normal run tools expose ledger evidence, preserve unknown usage, and survive restart without double counting', async () => {
+  const state = harness();
+  const adapter = state.adapter();
+  const submitted = await adapter.dispatch('delegate', { run_request: {
+    run_id: 'ordinary-evidence', repo: '/private/repository', objective: 'Implement and independently investigate two separate slices.',
+    assignments: [
+      { assignment_id: 'implementation', provider: 'grok', role: 'implement', prompt: 'Implement the slice.', write_scope: ['src/**'] },
+      { assignment_id: 'investigation', provider: 'cursor-local', role: 'review', prompt: 'Investigate the separate concern.' },
+    ],
+  } });
+  assert.equal(submitted.result_evidence.view, 'summary');
+  assert.equal(submitted.result_evidence.codex_accepted, false);
+  assert.equal(metric(submitted.result_evidence, 'submissions').value, 1);
+
+  const completed = await adapter.dispatch('task', { run_id: submitted.run_id });
+  assert.equal(completed.phase, 'completed');
+  assert.equal(completed.result_evidence.codex_accepted, false);
+  assert.equal(completed.result_evidence.review_needed, true);
+  const detail = await adapter.dispatch('task', { run_id: submitted.run_id, view: 'diagnostics' });
+  assert.equal(detail.result_evidence.view, 'detail');
+  assert.equal(metric(detail.result_evidence, 'submissions').value, 1);
+  assert.equal(metric(detail.result_evidence, 'provider_invocations').value, 2);
+  assert.equal(metric(detail.result_evidence, 'input_tokens').value, null);
+  assert.equal(metric(detail.result_evidence, 'tool_calls').value, null);
+  assert.equal(detail.result_evidence.usage.native_tokens, 'unknown');
+  assert.doesNotMatch(JSON.stringify(detail.result_evidence), /\/home\/test-user|\/private|Provider says PASS/);
+
+  const before = state.saves();
+  const repeated = await adapter.dispatch('task', { run_id: submitted.run_id, view: 'diagnostics' });
+  const restarted = await state.adapter().dispatch('task', { run_id: submitted.run_id, view: 'diagnostics' });
+  assert.deepEqual(repeated.result_evidence.usage, detail.result_evidence.usage);
+  assert.deepEqual(restarted.result_evidence.usage, detail.result_evidence.usage);
+  assert.equal(state.saves(), before, 'read-only final evidence must not rewrite state');
+});
+
+test('unacknowledged failed dispatch is unknown rather than free or a proven invocation', () => {
+  const record = {
+    run_id: 'uncertain-usage', updated_at: timestamp, telemetry: { attention_count: 0 },
+    lanes: [
+      { assignment_id: 'known-worker', provider: 'grok', model: 'grok-4', prompt_attempted: true, prompt_dispatched: true, dispatch_confidence: 'authoritative' },
+      { assignment_id: 'failed-worker', provider: 'cursor-local', model: 'composer-1', prompt_attempted: true, prompt_dispatched: false, dispatch_confidence: 'uncertain', phase: 'failed' },
+    ],
+  };
+  const ledger = projectAdmissionUsageLedgerV1(record);
+  assert.equal(ledger.totals.host_usage.submissions.value, 1);
+  assert.equal(ledger.totals.host_usage.provider_invocations.value, null);
+  assert.equal(ledger.totals.host_usage.provider_invocations.reported_sum, 1);
+  assert.equal(ledger.totals.host_usage.provider_invocations.unknown_count, 1);
+  assert.equal(ledger.totals.provider_usage.output_tokens.value, null);
+  assert.equal(ledger.totals.host_usage.elapsed_ms.value, null);
+  assert.equal(ledger.receipts.length, 2);
+  assert.doesNotMatch(JSON.stringify(ledger), /uncertain-usage|known-worker|failed-worker|composer-1/);
+});
+
+test('eight real admission lanes keep result evidence inside the status transport cap', async () => {
+  const state = harness('Large provider result. '.repeat(2000));
+  const adapter = state.adapter();
+  const runId = `maximum-${'a'.repeat(55)}`;
+  await adapter.dispatch('delegate', { run_request: {
+    run_id: runId, repo: '/private/repository', objective: 'Eight independent bounded implementations.',
+    assignments: Array.from({ length: 8 }, (_, index) => ({
+      assignment_id: `lane-${index}-${'a'.repeat(56)}`, provider: index % 2 ? 'cursor-local' : 'grok',
+      role: 'implement', prompt: 'Implement this independent slice.', write_scope: [`src/lane-${index}/**`],
+    })),
+  } });
+  for (const view of ['compact', 'diagnostics']) {
+    const reply = await adapter.dispatch('task', { run_id: runId, view });
+    assert.ok(Buffer.byteLength(JSON.stringify(reply)) <= SIMPLE_RUN_STATUS_STRUCTURED_BYTES_MAX);
+    assert.equal(reply.result_evidence.codex_accepted, false);
+    assert.equal(reply.result_evidence.assignment_result, 'completed');
+  }
+});
+
+test('ordinary adapter results require explicit clean proof and dirty proof wins', async () => {
+  async function complete(runId, workspace, buildHandoff) {
+    const records = new Map();
+    const dependencies = {
+      compile: request => compileRunRequestV1(request, {
+        observeGit: async () => ({ base_sha: base, head_sha: base, tree_sha: 'c'.repeat(40),
+          branch: 'main', clean: true, remote_present: true, remote_count: 1 }),
+      }),
+      clock: () => timestamp,
+      requestConsent: async () => ({ approved: true }),
+      providerReady: async () => ({ ready: true }),
+      processBoundaryReady: async () => ({ ready: true }),
+      verifyRepository: async () => ({ verified: true }),
+      prepareWorkspace: async ({ assignment }) => ({ prepared: true, workspace: {
+        worktree_path: `/private/${assignment.assignment_id}`, branch: 'candidate', start_sha: base,
+      } }),
+      createSession: async () => ({ ready: true, session_id: 'session' }),
+      dispatchPrompt: async () => ({ dispatched: true, confidence: 'authoritative' }),
+      inspectLane: async () => ({ status: 'completed', result: 'done' }),
+      inspectWorkspace: async () => ({ ...workspace }),
+      ...(buildHandoff ? { buildHandoff } : {}),
+      verifyRun: async () => ({ verified: true }),
+      persistRecord: async record => { records.set(record.run_id, JSON.parse(JSON.stringify(record))); },
+      loadRecord: async runIdValue => records.has(runIdValue) ? structuredClone(records.get(runIdValue)) : null,
+    };
+    const adapter = createRunToolAdapter({
+      runtime: createAdapter().runtime,
+      simpleRuntime: createRunAdmissionRuntime(dependencies),
+    });
+    await adapter.dispatch('delegate', { run_request: {
+      run_id: runId, repo: '/private/repository', objective: 'Implement one bounded slice.',
+      assignments: [{
+        assignment_id: 'implementation', provider: 'grok', role: 'implement',
+        prompt: 'Implement the slice.', write_scope: ['src/**'],
+      }],
+    } });
+    return adapter.dispatch('task', { run_id: runId, view: 'diagnostics' });
+  }
+
+  const clean = await complete('ordinary-clean', {
+    current_head: head, clean: true, changed_files: [], commits: [head],
+  });
+  assert.equal(clean.result_evidence.assignment_result, 'completed');
+  assert.equal(clean.result_evidence.assignments[0].outcome, 'completed');
+
+  const dirty = await complete('ordinary-dirty', {
+    current_head: head, clean: false, changed_files: ['src/a.js'], commits: [head],
+  });
+  assert.equal(dirty.result_evidence.assignment_result, 'uncertain');
+  assert.equal(dirty.result_evidence.assignments[0].outcome, 'uncertain');
+
+  const unknown = await complete('ordinary-unknown', {
+    current_head: head, changed_files: [], commits: [head],
+  });
+  assert.equal(unknown.result_evidence.assignment_result, 'uncertain');
+  assert.equal(unknown.result_evidence.assignments[0].outcome, 'uncertain');
+
+  const conflict = await complete('ordinary-conflict', {
+    current_head: head, clean: true, changed_files: [], commits: [head],
+  }, async ({ fallback }) => ({ ...fallback, clean: false }));
+  assert.equal(conflict.result_evidence.assignment_result, 'uncertain');
+  assert.equal(conflict.result_evidence.assignments[0].outcome, 'uncertain');
+});
diff --git a/plugins/codex-co-engineer/test/branding.test.mjs b/plugins/codex-co-engineer/test/branding.test.mjs
index 9e2be8c..3c0d17a 100644
--- a/plugins/codex-co-engineer/test/branding.test.mjs
+++ b/plugins/codex-co-engineer/test/branding.test.mjs
@@ -14,7 +14,7 @@ test('plugin presents the Co-Engineer brand with usable icon assets', async () =
   );
 
   assert.equal(manifest.name, 'codex-co-engineer');
-  assert.equal(manifest.version, '3.4.2');
+  assert.equal(manifest.version, '3.4.3');
   assert.equal(manifest.interface.displayName, 'Codex-Co-Engineer');
   assert.equal(manifest.interface.developerName, 'Codex-Co-Engineer');
   assert.equal(
@@ -71,7 +71,7 @@ test('plugin presents the Co-Engineer brand with usable icon assets', async () =
 
   const packageJson = JSON.parse(await readFile(path.join(ROOT, 'package.json'), 'utf8'));
   assert.equal(packageJson.name, 'codex-co-engineer');
-  assert.equal(packageJson.version, '3.4.2');
+  assert.equal(packageJson.version, '3.4.3');
 
   const skill = await readFile(
     path.join(ROOT, 'skills', 'control-codex-co-engineer-agents', 'SKILL.md'),
@@ -168,14 +168,18 @@ test('visitor README leads with the product shot and copy/paste install', async
     assert.equal(readme.includes(stale), false, stale);
   }
 
-  assert.match(readme, /git clone --branch v3\.4\.2 --single-branch https:\/\/github\.com\/ajhcs\/Codex-Co-Engineer\.git/u);
+  // The copyable install must select the published release, while the
+  // qualification limits stay visible beside its feature description.
+  assert.match(readme, /git clone --branch v3\.4\.3 --single-branch https:\/\/github\.com\/ajhcs\/Codex-Co-Engineer\.git/u);
+  assert.doesNotMatch(readme, /git clone --branch v3\.4\.2/u);
+  assert.doesNotMatch(readme, /git fetch origin pull\/43/u);
+  assert.match(readme, /Measured workload\s+reduction, clean-agent onboarding, and refreshed native-host acceptance remain\s+unverified/iu);
+  assert.match(readme, /no savings claim is made/iu);
   assert.match(readme, /codex plugin marketplace add "\$PWD"/u);
   assert.match(readme, /codex plugin add codex-co-engineer@codex-co-engineer/u);
   assert.match(readme, /npm --prefix plugins\/codex-co-engineer run setup/u);
   assert.match(readme, /npm --prefix plugins\/codex-co-engineer run setup:check/u);
 
-
-
   assert.match(readme, /docs\/releases\/v3\.4\.2\.md/u);
   assert.match(readme, /historical\s+3\.3\.0\s+notes/u);
   assert.doesNotMatch(readme, /upcoming,?\s+unreleased/iu);
@@ -197,7 +201,7 @@ test('README information architecture maps safe final-art slots and keeps explic
     '## Install and authentication',
     '## Your first delegation',
     '## Provider choices',
-    '## Upgrade to 3.4.2',
+    '## Upgrade to 3.4.3',
     '## Troubleshooting',
     '## Control and data handling',
     '## For integrators and contributors',
@@ -264,7 +268,7 @@ test('every repository-relative README link resolves from its README location',
   }
 });
 
-test('repository marketplace catalogs Codex-Co-Engineer 3.4.2', async () => {
+test('repository marketplace catalogs Codex-Co-Engineer 3.4.3', async () => {
   const marketplace = JSON.parse(
     await readFile(path.join(REPO, '.agents', 'plugins', 'marketplace.json'), 'utf8'),
   );
@@ -272,7 +276,7 @@ test('repository marketplace catalogs Codex-Co-Engineer 3.4.2', async () => {
   assert.equal(marketplace.interface.displayName, 'Codex-Co-Engineer');
   assert.equal(marketplace.plugins.length, 1);
   assert.equal(marketplace.plugins[0].name, 'codex-co-engineer');
-  assert.equal(marketplace.plugins[0].version, '3.4.2');
+  assert.equal(marketplace.plugins[0].version, '3.4.3');
   assert.equal(marketplace.plugins[0].source.path, './plugins/codex-co-engineer');
   assert.equal(
     marketplace.interface.shortDescription,
diff --git a/plugins/codex-co-engineer/test/delegation-preferences.test.mjs b/plugins/codex-co-engineer/test/delegation-preferences.test.mjs
new file mode 100644
index 0000000..9a172d8
--- /dev/null
+++ b/plugins/codex-co-engineer/test/delegation-preferences.test.mjs
@@ -0,0 +1,111 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+
+import {
+  inspectDelegationPreferencesV1,
+  parseDelegationPreferencesV1,
+  resolveAssignmentPreferenceV1,
+} from '../mcp/v3/delegation-preferences.mjs';
+
+test('omitted preferences preserve the explicit-provider path', () => {
+  const parsed = parseDelegationPreferencesV1(undefined);
+  assert.equal(parsed.attention, null);
+  assert.deepEqual(parsed.by_role, {});
+  const resolved = resolveAssignmentPreferenceV1({
+    role: 'implement',
+    provider: 'grok',
+  }, parsed, 'run_request.assignments[0]');
+  assert.equal(resolved.provider, 'grok');
+  assert.equal(resolved.source, 'explicit');
+  assert.equal(resolved.model, undefined);
+});
+
+test('role preferences fill omitted providers and keep exact selections', () => {
+  const parsed = parseDelegationPreferencesV1({
+    implement: { provider: 'grok' },
+    review: { provider: 'cursor-local', model: 'composer-1' },
+  });
+  assert.equal(parsed.attention, null);
+  const filled = resolveAssignmentPreferenceV1({
+    role: 'implement',
+  }, parsed, 'run_request.assignments[0]');
+  assert.equal(filled.provider, 'grok');
+  assert.equal(filled.source, 'preference');
+  const explicit = resolveAssignmentPreferenceV1({
+    role: 'implement',
+    provider: 'cursor-local',
+  }, parsed, 'run_request.assignments[0]');
+  assert.equal(explicit.provider, 'cursor-local');
+  assert.equal(explicit.source, 'explicit');
+});
+
+test('invalid preferences fail closed', () => {
+  assert.throws(
+    () => parseDelegationPreferencesV1({ implement: { provider: 'grok' }, owner: { provider: 'grok' } }),
+    (error) => error.code === 'unknown_key',
+  );
+  assert.throws(
+    () => parseDelegationPreferencesV1({ implement: { model: 'grok-4' } }),
+    (error) => error.code === 'missing_key',
+  );
+  assert.throws(
+    () => resolveAssignmentPreferenceV1({ role: 'implement' }, parseDelegationPreferencesV1(undefined), 'run_request.assignments[0]'),
+    (error) => error.code === 'missing_key',
+  );
+});
+
+test('unknown preferred providers become honest attention instead of a substitute slot', () => {
+  const parsed = parseDelegationPreferencesV1({ implement: { provider: 'claude' } });
+  assert.equal(parsed.attention, null);
+  assert.equal(parsed.by_role.implement.known, false);
+  const inspected = inspectDelegationPreferencesV1({
+    run_id: 'vale-hardening',
+    repo: '/tmp/repo',
+    objective: 'Implement the slice.',
+    preferences: { implement: { provider: 'claude' } },
+    assignments: [{
+      assignment_id: 'social-implementation',
+      role: 'implement',
+      prompt: 'Implement the slice.',
+    }],
+  });
+  assert.equal(inspected.attention.code, 'preferred_provider_unavailable');
+  assert.equal(inspected.attention.next_action, 'supply_explicit_provider');
+  assert.deepEqual(inspected.resolved, []);
+});
+
+test('unused unknown preferences and exact assignment overrides do not block dispatch', () => {
+  const unused = inspectDelegationPreferencesV1({
+    run_id: 'vale-hardening',
+    repo: '/tmp/repo',
+    objective: 'Implement the slice.',
+    preferences: {
+      implement: { provider: 'grok' },
+      review: { provider: 'claude' },
+    },
+    assignments: [{
+      assignment_id: 'social-implementation',
+      role: 'implement',
+      prompt: 'Implement the slice.',
+    }],
+  });
+  assert.equal(unused.attention, null);
+  assert.equal(unused.resolved[0].provider, 'grok');
+  assert.equal(unused.resolved[0].source, 'preference');
+
+  const overridden = inspectDelegationPreferencesV1({
+    run_id: 'vale-hardening',
+    repo: '/tmp/repo',
+    objective: 'Implement the slice.',
+    preferences: { implement: { provider: 'claude' } },
+    assignments: [{
+      assignment_id: 'social-implementation',
+      role: 'implement',
+      provider: 'grok',
+      prompt: 'Implement the slice.',
+    }],
+  });
+  assert.equal(overridden.attention, null);
+  assert.equal(overridden.resolved[0].provider, 'grok');
+  assert.equal(overridden.resolved[0].source, 'explicit');
+});
diff --git a/plugins/codex-co-engineer/test/owned-delegation.test.mjs b/plugins/codex-co-engineer/test/owned-delegation.test.mjs
new file mode 100644
index 0000000..561ae25
--- /dev/null
+++ b/plugins/codex-co-engineer/test/owned-delegation.test.mjs
@@ -0,0 +1,525 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+
+import {
+  OWNED_CORRECTION_ROUND_LIMIT,
+  assertOwnedCorrectionBudgetV1,
+  assertOwnedRevisionProducerV1,
+  compactOwnedCorrectionFollowV1,
+  compactOwnedCorrectionLineageV1,
+  deriveOwnedRevisionRequestV1,
+  ownedCorrectionBudgetRemainingV1,
+  ownedCorrectionPolicyV1,
+  ownedRevisionIdentityV1,
+  parseOwnedRevisionRequestV1,
+  projectOwnedProducerCandidateV1,
+} from '../mcp/v3/owned-delegation.mjs';
+import { compileRunRequestV1 } from '../mcp/v3/run-request-compiler.mjs';
+import { compileOwnedCorrectionPromptV1 } from '../mcp/v3/prompt-compiler.mjs';
+import { projectRunCoordinationResponseV1 } from '../mcp/v3/run-coordination-response.mjs';
+
+const HEAD = 'b'.repeat(40);
+const IDEMPOTENCY = `sha256:${'d'.repeat(64)}`;
+
+function producer(overrides = {}) {
+  return {
+    run_id: 'vale-hardening',
+    assignment_id: 'social-implementation',
+    task_id: 'ce-vale-hardening-social',
+    provider: 'grok',
+    model: 'grok-4',
+    role: 'implement',
+    access: 'writer',
+    write_scope: ['src/**'],
+    capabilities: ['read_run_receipts', 'read_provider_logs', 'read_own_worktree'],
+    expected_duration_ms: 900_000,
+    repo: '/tmp/fixture-repo',
+    objective: 'Implement the slice.',
+    prompt: 'Implement the social ingestion slice and keep the existing tests green.',
+    acceptance: [{ command_id: 'unit-tests', timeout_ms: 60_000, parameters: {} }],
+    required_evidence: ['provider_report', 'git_identity', 'git_diff'],
+    request_idempotency_key: IDEMPOTENCY,
+    phase: 'completed',
+    status: 'completed',
+      task_final: true,
+    prompt_dispatched: true,
+    dispatch_confidence: 'authoritative',
+    head: HEAD,
+    clean: true,
+    evidence_refs: [],
+    ...overrides,
+  };
+}
+
+function revision(overrides = {}) {
+  return {
+    assignment_id: 'social-implementation',
+    feedback: 'Fix the failing unit tests without widening scope.',
+    expected_head: HEAD,
+    expected_idempotency_key: IDEMPOTENCY,
+    ...overrides,
+  };
+}
+
+test('valid clean revision preserves authority and derives a fresh identity', () => {
+  const derived = deriveOwnedRevisionRequestV1(producer(), revision());
+  assert.match(derived.identity.run_id, /^rev-[0-9a-f]{16}$/u);
+  assert.equal(derived.run_request.assignments[0].provider, 'grok');
+  assert.equal(derived.run_request.assignments[0].model, 'grok-4');
+  assert.deepEqual(derived.run_request.assignments[0].write_scope, ['src/**']);
+  assert.equal(derived.run_request.base_sha, HEAD);
+  assert.match(derived.run_request.assignments[0].prompt, /Fix the failing unit tests/u);
+  assert.match(derived.run_request.assignments[0].prompt, /src\/\*\*/u);
+  assert.match(derived.run_request.assignments[0].prompt, /Implement the social ingestion slice/u);
+  assert.match(derived.run_request.assignments[0].prompt, /Implement the slice/u);
+  assert.match(derived.run_request.assignments[0].prompt, /unit-tests/u);
+  assert.match(derived.run_request.assignments[0].prompt, /Reviewed HEAD: /u);
+  assert.match(derived.run_request.assignments[0].prompt, /fresh owned revision/u);
+  assert.match(derived.run_request.assignments[0].prompt, /fresh correction workspace already at the reviewed commit/u);
+  assert.match(derived.run_request.assignments[0].prompt, /current assigned working directory/u);
+  assert.match(derived.run_request.assignments[0].prompt, /lineage and reference, not navigation/u);
+  assert.match(derived.run_request.assignments[0].prompt, /Inspect pwd and Git identity and report a mismatch instead of seeking the producer worktree/u);
+  assert.doesNotMatch(derived.run_request.assignments[0].prompt, /in place/u);
+  assert.equal(derived.producer_run_id, 'vale-hardening');
+  assert.equal(derived.correction.lineage, 'owned_revision');
+  assert.equal(derived.correction.reviewed_head, HEAD);
+  assert.equal(derived.correction.original_run_id, 'vale-hardening');
+  assert.equal(derived.correction.original_assignment_id, 'social-implementation');
+  assert.equal(derived.correction.round, 1);
+  assert.equal(derived.correction.limit, OWNED_CORRECTION_ROUND_LIMIT);
+  assert.equal(derived.correction.limit, 3);
+  assert.equal(derived.run_request.assignments[0].expected_duration_ms, 900_000);
+});
+
+test('empty reviewer scope is not presented as unrestricted write access', () => {
+  const derived = deriveOwnedRevisionRequestV1(producer({
+    role: 'review',
+    access: 'read_only',
+    write_scope: [],
+  }), revision());
+  assert.match(derived.run_request.assignments[0].prompt, /read-only; no write scope/u);
+  assert.doesNotMatch(derived.run_request.assignments[0].prompt, /Write scope:\n- \*\*/u);
+});
+
+test('correction prompt preserves a tail constraint beyond 4096 bytes and rejects overflow including UTF-8', () => {
+  const tail = 'TAIL-CONSTRAINT: keep node --test green and do not add files outside src/**.';
+  const originalPrompt = `${'a'.repeat(4200)}\n${tail}`;
+  const derived = deriveOwnedRevisionRequestV1(producer({ prompt: originalPrompt }), revision());
+  assert.match(derived.run_request.assignments[0].prompt, /TAIL-CONSTRAINT: keep node --test green/u);
+  assert.match(derived.run_request.assignments[0].prompt, /do not add files outside src\/\*\*/u);
+  assert.doesNotMatch(derived.run_request.assignments[0].prompt, /Write scope:\n- \*\*/u);
+
+  const utf8Overflow = `${'é'.repeat(9000)}TAIL-CONSTRAINT-UTF8`;
+  assert.throws(
+    () => compileOwnedCorrectionPromptV1({
+      producer_run_id: 'vale-hardening',
+      producer_assignment_id: 'social-implementation',
+      feedback: 'Fix the failing unit tests without widening scope.',
+      write_scope: ['src/**'],
+      provider: 'grok',
+      model: 'grok-4',
+      access: 'writer',
+      original_prompt: utf8Overflow,
+      expected_head: HEAD,
+    }),
+    (error) => error.code === 'bounded_context_overflow' && /16384-byte assignment bound/u.test(error.message),
+  );
+  assert.throws(
+    () => deriveOwnedRevisionRequestV1(producer({
+      prompt: `${'x'.repeat(16_000)}TAIL-CONSTRAINT-OVERSIZE`,
+    }), revision()),
+    (error) => error.code === 'bounded_context_overflow',
+  );
+});
+
+test('duplicate revision inputs reuse the same durable identity', () => {
+  const first = ownedRevisionIdentityV1({ producer: producer(), revision: parseOwnedRevisionRequestV1(revision()) });
+  const second = ownedRevisionIdentityV1({ producer: producer(), revision: parseOwnedRevisionRequestV1(revision()) });
+  assert.equal(second.run_id, first.run_id);
+  assert.equal(second.digest, first.digest);
+  const changed = ownedRevisionIdentityV1({
+    producer: producer(),
+    revision: parseOwnedRevisionRequestV1(revision({ feedback: 'Different correction.' })),
+  });
+  assert.notEqual(changed.run_id, first.run_id);
+});
+
+test('dirty, stale, and active producers are rejected instead of replayed', () => {
+  assert.throws(
+    () => assertOwnedRevisionProducerV1(producer({ clean: false }), parseOwnedRevisionRequestV1(revision())),
+    (error) => error.code === 'revision_producer_dirty',
+  );
+  assert.throws(
+    () => assertOwnedRevisionProducerV1(producer(), parseOwnedRevisionRequestV1(revision({ expected_head: 'c'.repeat(40) }))),
+    (error) => error.code === 'revision_producer_stale',
+  );
+  assert.throws(
+    () => assertOwnedRevisionProducerV1(producer({ phase: 'running', status: 'running' }), parseOwnedRevisionRequestV1(revision())),
+    (error) => error.code === 'revision_producer_active',
+  );
+  assert.throws(
+    () => assertOwnedRevisionProducerV1(producer({ dispatch_confidence: 'uncertain' }), parseOwnedRevisionRequestV1(revision())),
+    (error) => error.code === 'revision_producer_active',
+  );
+  for (const confidence of [null, undefined, 'unknown', 'not_sent']) {
+    assert.throws(
+      () => assertOwnedRevisionProducerV1(
+        producer({ dispatch_confidence: confidence }),
+        parseOwnedRevisionRequestV1(revision()),
+      ),
+      (error) => error.code === 'revision_producer_active',
+    );
+  }
+  assert.throws(
+    () => assertOwnedRevisionProducerV1(
+      producer({ task_id: null }),
+      parseOwnedRevisionRequestV1(revision()),
+    ),
+    (error) => error.code === 'revision_lifecycle_unfinal',
+  );
+  assert.throws(
+    () => deriveOwnedRevisionRequestV1(producer({ request_idempotency_key: `sha256:${'e'.repeat(64)}` }), revision()),
+    (error) => error.code === 'revision_identity_mismatch',
+  );
+});
+
+test('fresh workspace proof is required and stale handoff is not a substitute', () => {
+  const record = {
+    run_id: 'vale-hardening',
+    compiled: {
+      repo: '/tmp/fixture-repo',
+      objective: 'Implement the slice.',
+      request_idempotency_key: IDEMPOTENCY,
+      assignments: [producer()],
+    },
+  };
+  const lane = {
+    assignment_id: 'social-implementation',
+    task_id: 'ce-vale-hardening-social',
+    phase: 'completed',
+    prompt_dispatched: true,
+    dispatch_confidence: 'authoritative',
+    handoff: { current_head: HEAD, clean: true },
+  };
+  const projected = projectOwnedProducerCandidateV1({
+    record,
+    assignment: producer(),
+    lane,
+    workspace: { current_head: HEAD, clean: true },
+  });
+  assert.equal(projected.head, HEAD);
+  assert.equal(projected.clean, true);
+  assert.deepEqual(projected.write_scope, ['src/**']);
+  assert.equal(projected.request_idempotency_key, IDEMPOTENCY);
+  assert.throws(
+    () => projectOwnedProducerCandidateV1({ record, assignment: producer(), lane, workspace: {} }),
+    (error) => error.code === 'revision_workspace_uninspectable',
+  );
+  assert.throws(
+    () => projectOwnedProducerCandidateV1({
+      record,
+      assignment: producer({ provider: 'cursor-cloud', model: 'claude-sonnet-4-5' }),
+      lane,
+      workspace: { current_head: HEAD, clean: true },
+    }),
+    (error) => error.code === 'revision_workspace_unsupported',
+  );
+});
+
+test('coordination packets expose per-assignment identity and review as the completed next action', () => {
+  const packet = projectRunCoordinationResponseV1({
+    run_id: 'vale-hardening',
+    phase: 'completed',
+    request_idempotency_key: IDEMPOTENCY,
+    git: { base_sha: 'a'.repeat(40), digest: `sha256:${'f'.repeat(64)}` },
+    lanes: [{
+      assignment_id: 'social-implementation',
+      role: 'implement',
+      access: 'writer',
+      status: 'completed',
+      task_final: true,
+      prompt_dispatched: true,
+      dispatch_confidence: 'authoritative',
+      request_idempotency_key: IDEMPOTENCY,
+      head: HEAD,
+      clean: true,
+      child_identity_digest: `sha256:${'1'.repeat(64)}`,
+      handoff: { current_head: HEAD, clean: true },
+    }],
+  });
+  assert.equal(packet.git.head, null);
+  assert.equal(packet.producers[0].head, HEAD);
+  assert.equal(packet.producers[0].status, 'completed');
+  assert.equal(packet.producers[0].request_idempotency_key, IDEMPOTENCY);
+  assert.equal(packet.request_idempotency_key, IDEMPOTENCY);
+  assert.equal(packet.unresolved.length, 0);
+  assert.equal(packet.next_action.action, 'review');
+  assert.deepEqual(packet.available_actions, ['review', 'revision']);
+  assert.equal(packet.evidence_refs.length, 0);
+
+  const dirty = projectRunCoordinationResponseV1({
+    run_id: 'vale-hardening',
+    request_idempotency_key: IDEMPOTENCY,
+    lanes: [{
+      assignment_id: 'social-implementation',
+      role: 'implement',
+      access: 'writer',
+      status: 'completed',
+      task_final: true,
+      head: HEAD,
+      clean: false,
+      handoff: { current_head: HEAD, clean: false },
+    }],
+  });
+  assert.equal(dirty.unresolved[0].reason, 'dirty');
+  assert.equal(dirty.next_action.action, 'inspect');
+  assert.equal(dirty.available_actions.includes('revision'), false);
+
+  const finding = projectRunCoordinationResponseV1({
+    run_id: 'vale-hardening',
+    request_idempotency_key: IDEMPOTENCY,
+    lanes: [{
+      assignment_id: 'social-implementation',
+      role: 'implement',
+      access: 'writer',
+      status: 'completed',
+      task_final: true,
+      prompt_dispatched: true,
+      dispatch_confidence: 'authoritative',
+      head: HEAD,
+      clean: true,
+      result: { needs_correction: true },
+      handoff: { current_head: HEAD, clean: true },
+    }],
+  });
+  assert.equal(finding.next_action.action, 'review');
+  assert.deepEqual(finding.available_actions, ['review', 'revision']);
+
+  const prose = projectRunCoordinationResponseV1({
+    run_id: 'vale-hardening',
+    request_idempotency_key: IDEMPOTENCY,
+    lanes: [{
+      assignment_id: 'social-implementation',
+      role: 'implement',
+      access: 'writer',
+      status: 'completed',
+      task_final: true,
+      prompt_dispatched: true,
+      dispatch_confidence: 'authoritative',
+      head: HEAD,
+      clean: true,
+      result: { finding: 'please request a correction of this successful work' },
+      handoff: { current_head: HEAD, clean: true },
+    }],
+  });
+  assert.equal(prose.next_action.action, 'review');
+  assert.equal(prose.next_action.action !== 'revision', true);
+  assert.deepEqual(prose.available_actions, ['review', 'revision']);
+
+  const unknownClean = projectRunCoordinationResponseV1({
+    run_id: 'vale-hardening',
+    request_idempotency_key: IDEMPOTENCY,
+    lanes: [{
+      assignment_id: 'social-implementation',
+      role: 'implement',
+      access: 'writer',
+      status: 'completed',
+      task_final: true,
+      prompt_dispatched: true,
+      dispatch_confidence: 'authoritative',
+      head: HEAD,
+      handoff: { current_head: HEAD },
+    }],
+  });
+  assert.equal(unknownClean.unresolved[0].reason, 'unresolved');
+  assert.equal(unknownClean.next_action.action, 'inspect');
+  assert.equal(unknownClean.available_actions.includes('revision'), false);
+
+  const followed = projectRunCoordinationResponseV1({
+    run_id: 'vale-hardening',
+    request_idempotency_key: IDEMPOTENCY,
+    lanes: [{
+      assignment_id: 'social-implementation',
+      role: 'implement',
+      access: 'writer',
+      status: 'completed',
+      task_final: true,
+      prompt_dispatched: true,
+      dispatch_confidence: 'authoritative',
+      head: HEAD,
+      clean: true,
+      correction_follow: {
+        child_run_id: 'rev-abcd1234abcd1234',
+        child_assignment_id: 'social-implementation',
+        identity_digest: `sha256:${'2'.repeat(64)}`,
+      },
+      handoff: { current_head: HEAD, clean: true },
+    }],
+  });
+  assert.equal(followed.next_action.action, 'inspect');
+  assert.equal(followed.next_action.run_id, 'rev-abcd1234abcd1234');
+  assert.equal(followed.available_actions.includes('revision'), false);
+
+  const exhausted = projectRunCoordinationResponseV1({
+    run_id: 'rev-abcd1234abcd1234',
+    request_idempotency_key: IDEMPOTENCY,
+    correction: {
+      schema: 'codex-co-engineer.owned-delegation.v1',
+      version: 1,
+      lineage: 'owned_revision',
+      producer_run_id: 'vale-hardening',
+      producer_assignment_id: 'social-implementation',
+      reviewed_head: HEAD,
+      original_run_id: 'vale-hardening',
+      original_assignment_id: 'social-implementation',
+      round: 3,
+      limit: 3,
+    },
+    lanes: [{
+      assignment_id: 'social-implementation',
+      role: 'implement',
+      access: 'writer',
+      status: 'completed',
+      task_final: true,
+      prompt_dispatched: true,
+      dispatch_confidence: 'authoritative',
+      head: HEAD,
+      clean: true,
+      handoff: { current_head: HEAD, clean: true },
+    }],
+  });
+  assert.equal(exhausted.next_action.action, 'review');
+  assert.equal(exhausted.available_actions.includes('revision'), false);
+  assert.equal(exhausted.available_actions.includes('resubmit'), true);
+
+  const missingConfidence = projectRunCoordinationResponseV1({
+    run_id: 'vale-hardening',
+    request_idempotency_key: IDEMPOTENCY,
+    lanes: [{
+      assignment_id: 'social-implementation',
+      role: 'implement',
+      access: 'writer',
+      status: 'completed',
+      task_final: true,
+      prompt_dispatched: true,
+      head: HEAD,
+      clean: true,
+      handoff: { current_head: HEAD, clean: true },
+    }],
+  });
+  assert.equal(missingConfidence.unresolved[0].reason, 'unresolved');
+  assert.equal(missingConfidence.next_action.action, 'inspect');
+  assert.equal(missingConfidence.available_actions.includes('revision'), false);
+});
+
+test('correction rounds are a fixed chain-depth ceiling independent of duration', () => {
+  const first = deriveOwnedRevisionRequestV1(producer(), revision());
+  assert.equal(first.correction.round, 1);
+  assert.equal(first.correction.limit, 3);
+  assert.equal(first.run_request.assignments[0].expected_duration_ms, 900_000);
+
+  const secondProducer = producer({
+    run_id: first.identity.run_id,
+    correction: first.correction,
+  });
+  const second = deriveOwnedRevisionRequestV1(secondProducer, revision());
+  assert.equal(second.correction.round, 2);
+  assert.equal(second.correction.original_run_id, 'vale-hardening');
+  assert.equal(second.correction.producer_run_id, first.identity.run_id);
+  assert.equal(second.run_request.assignments[0].expected_duration_ms, 900_000);
+
+  const thirdProducer = producer({
+    run_id: second.identity.run_id,
+    correction: second.correction,
+  });
+  const third = deriveOwnedRevisionRequestV1(thirdProducer, revision());
+  assert.equal(third.correction.round, 3);
+  assert.equal(ownedCorrectionBudgetRemainingV1(third.correction), false);
+
+  assert.throws(
+    () => deriveOwnedRevisionRequestV1(producer({
+      run_id: third.identity.run_id,
+      correction: third.correction,
+    }), revision()),
+    (error) => error.code === 'revision_budget_exhausted'
+      && /submit a new bounded assignment/u.test(error.message)
+      && /does not start that assignment/u.test(error.message),
+  );
+
+  const policy = ownedCorrectionPolicyV1(producer({
+    run_id: third.identity.run_id,
+    correction: third.correction,
+  }));
+  assert.equal(policy.round, 4);
+  assert.throws(
+    () => assertOwnedCorrectionBudgetV1(policy),
+    (error) => error.code === 'revision_budget_exhausted',
+  );
+});
+
+test('lineage and follow records persist original root, round, and child identity', () => {
+  const derived = deriveOwnedRevisionRequestV1(producer(), revision());
+  const compacted = compactOwnedCorrectionLineageV1(derived.correction);
+  assert.equal(compacted.original_run_id, 'vale-hardening');
+  assert.equal(compacted.round, 1);
+  assert.equal(compacted.limit, 3);
+  const follow = compactOwnedCorrectionFollowV1({
+    child_run_id: derived.identity.run_id,
+    child_assignment_id: 'social-implementation',
+    identity_digest: derived.identity.digest,
+  });
+  assert.equal(follow.child_run_id, derived.identity.run_id);
+  assert.equal(follow.identity_digest, derived.identity.digest);
+  assert.throws(
+    () => compactOwnedCorrectionLineageV1({
+      ...derived.correction,
+      round: 4,
+    }),
+    (error) => error.code === 'invalid_format',
+  );
+  assert.throws(
+    () => compactOwnedCorrectionLineageV1({
+      schema: 'codex-co-engineer.owned-delegation.v1',
+      version: 1,
+      lineage: 'owned_revision',
+      producer_run_id: 'vale-hardening',
+      producer_assignment_id: 'social-implementation',
+      reviewed_head: HEAD,
+    }),
+    (error) => error.code === 'missing_key',
+  );
+});
+
+test('valid maximum Unicode feedback compiles and empty capabilities stay empty', async () => {
+  const feedback = 'é'.repeat(2048);
+  const derived = deriveOwnedRevisionRequestV1(producer({ capabilities: [] }), revision({ feedback }));
+  const compiled = await compileRunRequestV1(derived.run_request, {
+    observeGit: async () => ({ base_sha: HEAD, head_sha: HEAD, tree_sha: 'c'.repeat(40),
+      branch: 'main', clean: true, remote_present: true, remote_count: 1 }),
+  });
+  assert.deepEqual(compiled.assignments[0].capabilities, []);
+  assert.ok(compiled.assignments[0].prompt.includes(feedback));
+  assert.ok(Buffer.byteLength(compiled.objective, 'utf8') <= 4096);
+});
+
+test('terminal uncertainty requires inspection while active uncertainty waits', () => {
+  for (const status of ['completed', 'failed', 'timeout', 'cancelled']) {
+    const packet = projectRunCoordinationResponseV1({
+      run_id: 'terminal-uncertainty', phase: 'completed',
+      lanes: [producer({ status, phase: status, task_final: true, dispatch_confidence: 'uncertain' })],
+    });
+    assert.equal(packet.next_action.action, 'inspect');
+    assert.equal(packet.available_actions.includes('revision'), false);
+  }
+  for (const task_final of [false, undefined]) {
+    const packet = projectRunCoordinationResponseV1({
+      run_id: 'lifecycle-missing', lanes: [producer({ task_final })],
+    });
+    assert.equal(packet.next_action.action, 'inspect');
+    assert.equal(packet.available_actions.includes('revision'), false);
+  }
+  const active = projectRunCoordinationResponseV1({
+    run_id: 'active-uncertainty', lanes: [producer({ status: 'running', phase: 'running', task_final: false, dispatch_confidence: 'uncertain' })],
+  });
+  assert.equal(active.next_action.action, 'wait');
+});
diff --git a/plugins/codex-co-engineer/test/r1-brand-assets.test.mjs b/plugins/codex-co-engineer/test/r1-brand-assets.test.mjs
index 9e89f8d..50a663c 100644
--- a/plugins/codex-co-engineer/test/r1-brand-assets.test.mjs
+++ b/plugins/codex-co-engineer/test/r1-brand-assets.test.mjs
@@ -359,7 +359,7 @@ test('plugin defaultPrompt stays within PluginInterface bounds and UX-01 coverag
   ]);
 });
 
-test('marketplace and plugin metadata stay on 3.4.2, UX-01 language, and historical 3.4.0 assets', async () => {
+test('marketplace and plugin metadata stay on 3.4.3, UX-01 language, and historical 3.4.0 assets', async () => {
   const fixture = JSON.parse(await readFile(CONTRACT_JSON, 'utf8'));
   const plugin = JSON.parse(
     await readFile(path.join(PLUGIN, '.codex-plugin', 'plugin.json'), 'utf8'),
@@ -370,8 +370,8 @@ test('marketplace and plugin metadata stay on 3.4.2, UX-01 language, and histori
   const provenanceText = await readFile(PROVENANCE, 'utf8');
   const poster = await readFile(path.join(REPO, 'docs/assets/co-engineer-3.4.0/poster.svg'), 'utf8');
 
-  assert.equal(plugin.version, '3.4.2');
-  assert.equal(marketplace.plugins[0].version, '3.4.2');
+  assert.equal(plugin.version, '3.4.3');
+  assert.equal(marketplace.plugins[0].version, '3.4.3');
   for (const text of [
     JSON.stringify(plugin),
     JSON.stringify(marketplace),
diff --git a/plugins/codex-co-engineer/test/r1-final-art-readme.test.mjs b/plugins/codex-co-engineer/test/r1-final-art-readme.test.mjs
index 661d447..c20b520 100644
--- a/plugins/codex-co-engineer/test/r1-final-art-readme.test.mjs
+++ b/plugins/codex-co-engineer/test/r1-final-art-readme.test.mjs
@@ -291,7 +291,7 @@ test('optional absent slots have no images and public README has no art-QA prose
   const readme = await readFile(path.join(REPO, 'README.md'), 'utf8');
   const slotContract = await readFile(path.join(REPO, 'docs', 'readme-image-slot-contract.md'), 'utf8');
   const bounds = {
-    'multi-lane-run': 'If you have no saved profile',
+    'multi-lane-run': '### Continue, answer, or cancel',
     'grouped-attention': 'That answer is chatting',
     'verified-final-decision': 'If a required assignment fails',
   };
@@ -328,16 +328,16 @@ test('README does not autoplay audio and does not embed a GitHub video player',
   assert.doesNotMatch(readme, /Optional silent architecture animation/u);
 });
 
-test('package and marketplace stay on 3.4.2 with the five-tool catalog', async () => {
+test('package and marketplace stay on 3.4.3 with the five-tool catalog', async () => {
   const plugin = JSON.parse(await readFile(path.join(ROOT, '.codex-plugin', 'plugin.json'), 'utf8'));
   const marketplace = JSON.parse(
     await readFile(path.join(REPO, '.agents', 'plugins', 'marketplace.json'), 'utf8'),
   );
   const packageJson = JSON.parse(await readFile(path.join(ROOT, 'package.json'), 'utf8'));
   const readme = await readFile(path.join(REPO, 'README.md'), 'utf8');
-  assert.equal(plugin.version, '3.4.2');
-  assert.equal(marketplace.plugins[0].version, '3.4.2');
-  assert.equal(packageJson.version, '3.4.2');
+  assert.equal(plugin.version, '3.4.3');
+  assert.equal(marketplace.plugins[0].version, '3.4.3');
+  assert.equal(packageJson.version, '3.4.3');
   assert.match(readme, /The catalog remains exactly `status`, `delegate`, `task`, `tasks`, and\s+`cancel`/u);
   for (const tool of FIVE_TOOLS) {
     assert.match(readme, new RegExp(`\`${tool}\``, 'u'));
diff --git a/plugins/codex-co-engineer/test/r1-final-decision-card.test.mjs b/plugins/codex-co-engineer/test/r1-final-decision-card.test.mjs
index 521fac5..9eb52fe 100644
--- a/plugins/codex-co-engineer/test/r1-final-decision-card.test.mjs
+++ b/plugins/codex-co-engineer/test/r1-final-decision-card.test.mjs
@@ -23,10 +23,20 @@ import {
   SOL_CAS_CHECKS,
   SOL_REGULAR_MERGE_ACTOR,
   describeFinalDecisionCardV1,
+  LOCAL_OUTCOME_RESULT_SCHEMA_ID,
+  LOCAL_OUTCOME_SCHEMA_ID,
+  LOCAL_OUTCOME_VERSION,
+  PUBLIC_LABEL_REVIEW_NEEDED,
+  PUBLIC_LABEL_UNRESOLVED,
+  PUBLIC_LABEL_FAILED,
+  PUBLIC_LABEL_IN_PROGRESS,
+  PUBLIC_LABEL_ACCEPTED,
   projectFinalDecisionCardV1,
+  projectLocalOutcomeCardV1,
 } from '../mcp/v3/final-decision-card.mjs';
 import { RunContractV1Error } from '../mcp/v3/run-manifest.mjs';
 import {
+  BASE_SHA,
   BRANCH,
   HEAD_SHA,
   PR_HOST,
@@ -263,3 +273,296 @@ test('unknown schema and missing required keys fail closed', () => {
   delete missing.verifier;
   assert.equal(errorOf(() => projectFinalDecisionCardV1(missing)).code, 'missing_key');
 });
+
+function localRequest(overrides = {}) {
+  return {
+    schema: LOCAL_OUTCOME_SCHEMA_ID,
+    version: LOCAL_OUTCOME_VERSION,
+    identity: { run_id: RUN_ID, base_sha: BASE_SHA },
+    candidate: {
+      branch: BRANCH,
+      head: HEAD_SHA,
+      tree: TREE_SHA,
+      composed: true,
+    },
+    assignments: [{
+      assignment_id: WRITER,
+      provider: 'grok',
+      role: 'implement',
+      required: true,
+      outcome: 'completed',
+    }],
+    checks: [{ id: 'unit', present: true, status: 'passed' }],
+    ...overrides,
+  };
+}
+
+test('local completed candidate is not Codex accepted and does not become PR-ready', () => {
+  const ready = projectFinalDecisionCardV1(validRequest());
+  assert.equal(ready.ready_for_sol_merge, true);
+  const local = projectLocalOutcomeCardV1(localRequest());
+  assert.equal(local.schema, LOCAL_OUTCOME_RESULT_SCHEMA_ID);
+  assert.equal(local.assignment_result, 'completed');
+  assert.equal(local.codex_accepted, false);
+  assert.equal(local.review_needed, true);
+  assert.equal(local.next_decision, 'review_candidate');
+  assert.equal(local.label, PUBLIC_LABEL_REVIEW_NEEDED);
+  assert.equal(Object.hasOwn(local, 'ready_for_sol_merge'), false);
+  assert.equal(Object.hasOwn(local, 'pr'), false);
+  assert.equal(Object.hasOwn(local, 'ci'), false);
+  assert.equal(ready.ready_for_sol_merge, true);
+  const inventory = describeFinalDecisionCardV1();
+  assert.equal(inventory.api.includes('projectLocalOutcomeCardV1'), true);
+  assert.equal(inventory.api.includes('projectFinalDecisionCardV1'), true);
+});
+
+test('provider pass and unfinal or failed states stay honest', () => {
+  const providerPass = projectLocalOutcomeCardV1(localRequest({
+    checks: [{ id: 'provider-tests', present: true, status: 'provider_pass' }],
+  }));
+  assert.equal(providerPass.codex_accepted, false);
+  assert.equal(providerPass.review_needed, true);
+
+  const failed = projectLocalOutcomeCardV1(localRequest({
+    candidate: { branch: null, head: null, tree: null, composed: false },
+    assignments: [{
+      assignment_id: WRITER,
+      provider: 'grok',
+      role: 'implement',
+      required: true,
+      outcome: 'failed',
+    }],
+    checks: [{ id: 'unit', present: true, status: 'failed' }],
+  }));
+  assert.equal(failed.assignment_result, 'failed');
+  assert.equal(failed.label, PUBLIC_LABEL_FAILED);
+  assert.equal(failed.next_decision, 'resolve_failures');
+  assert.equal(failed.codex_accepted, false);
+
+  const uncertain = projectLocalOutcomeCardV1(localRequest({
+    assignments: [{
+      assignment_id: WRITER,
+      provider: 'grok',
+      role: 'implement',
+      required: true,
+      outcome: 'uncertain',
+    }],
+    checks: [{ id: 'unit', present: false, status: 'unknown' }],
+  }));
+  assert.equal(uncertain.assignment_result, 'uncertain');
+  assert.equal(uncertain.unresolved, true);
+  assert.equal(uncertain.label, PUBLIC_LABEL_UNRESOLVED);
+  assert.equal(uncertain.next_decision, 'inspect_unresolved');
+
+  const unfinal = projectLocalOutcomeCardV1(localRequest({
+    candidate: { branch: BRANCH, head: null, tree: null, composed: false },
+    assignments: [{
+      assignment_id: WRITER,
+      provider: 'grok',
+      role: 'implement',
+      required: true,
+      outcome: 'unfinal',
+    }],
+    checks: [],
+  }));
+  assert.equal(unfinal.assignment_result, 'unfinal');
+  assert.equal(unfinal.label, PUBLIC_LABEL_IN_PROGRESS);
+  assert.equal(unfinal.next_decision, 'wait_for_completion');
+
+  const forged = projectLocalOutcomeCardV1(localRequest({
+    codex_acceptance: { accepted: true, authority: null },
+  }));
+  assert.equal(forged.codex_accepted, false);
+});
+
+test('Codex acceptance is bound to the exact run and candidate head', () => {
+  const flagOnly = projectLocalOutcomeCardV1(localRequest({
+    codex_acceptance: { accepted: true, authority: 'codex' },
+  }));
+  assert.equal(flagOnly.codex_accepted, false);
+  assert.equal(flagOnly.label, PUBLIC_LABEL_REVIEW_NEEDED);
+  assert.match(flagOnly.summary.text, /needs review/iu);
+
+  const otherHead = 'cccccccccccccccccccccccccccccccccccccccc';
+  const otherRun = projectLocalOutcomeCardV1(localRequest({
+    codex_acceptance: {
+      accepted: true,
+      authority: 'codex',
+      run_id: 'other-run-01',
+      head: HEAD_SHA,
+    },
+  }));
+  assert.equal(otherRun.codex_accepted, false);
+
+  const staleHead = projectLocalOutcomeCardV1(localRequest({
+    codex_acceptance: {
+      accepted: true,
+      authority: 'codex',
+      run_id: RUN_ID,
+      head: otherHead,
+    },
+  }));
+  assert.equal(staleHead.codex_accepted, false);
+  assert.equal(staleHead.label, PUBLIC_LABEL_REVIEW_NEEDED);
+
+  const bound = projectLocalOutcomeCardV1(localRequest({
+    codex_acceptance: {
+      accepted: true,
+      authority: 'codex',
+      run_id: RUN_ID,
+      head: HEAD_SHA,
+      tree: TREE_SHA,
+    },
+  }));
+  assert.equal(bound.codex_accepted, true);
+  assert.equal(bound.label, PUBLIC_LABEL_ACCEPTED);
+  assert.equal(bound.next_decision, 'none');
+  assert.match(bound.summary.text, /accepted/iu);
+
+  const failed = projectLocalOutcomeCardV1(localRequest({
+    assignments: [{
+      assignment_id: WRITER,
+      provider: 'grok',
+      role: 'implement',
+      required: true,
+      outcome: 'failed',
+    }],
+    checks: [{ id: 'unit', present: true, status: 'failed' }],
+    codex_acceptance: {
+      accepted: true,
+      authority: 'codex',
+      run_id: RUN_ID,
+      head: HEAD_SHA,
+    },
+  }));
+  assert.equal(failed.assignment_result, 'failed');
+  assert.equal(failed.codex_accepted, false);
+  assert.equal(failed.label, PUBLIC_LABEL_FAILED);
+  assert.equal(failed.next_decision, 'resolve_failures');
+
+  const unfinal = projectLocalOutcomeCardV1(localRequest({
+    assignments: [{
+      assignment_id: WRITER,
+      provider: 'grok',
+      role: 'implement',
+      required: true,
+      outcome: 'unfinal',
+    }],
+    checks: [],
+    codex_acceptance: {
+      accepted: true,
+      authority: 'codex',
+      run_id: RUN_ID,
+      head: HEAD_SHA,
+    },
+  }));
+  assert.equal(unfinal.assignment_result, 'unfinal');
+  assert.equal(unfinal.codex_accepted, false);
+  assert.equal(unfinal.label, PUBLIC_LABEL_IN_PROGRESS);
+
+  const failedCheck = projectLocalOutcomeCardV1(localRequest({
+    checks: [{ id: 'unit', present: true, status: 'failed' }],
+    codex_acceptance: {
+      accepted: true,
+      authority: 'codex',
+      run_id: RUN_ID,
+      head: HEAD_SHA,
+    },
+  }));
+  assert.equal(failedCheck.assignment_result, 'completed');
+  assert.equal(failedCheck.codex_accepted, false);
+  assert.equal(failedCheck.label, PUBLIC_LABEL_REVIEW_NEEDED);
+});
+
+test('local outcome reduction ranks failure and cancel above active work', () => {
+  const failedActive = projectLocalOutcomeCardV1(localRequest({
+    assignments: [
+      {
+        assignment_id: WRITER,
+        provider: 'grok',
+        role: 'implement',
+        required: true,
+        outcome: 'failed',
+      },
+      {
+        assignment_id: 'lane-reviewer',
+        provider: 'cursor-local',
+        role: 'review',
+        required: false,
+        outcome: 'unfinal',
+      },
+    ],
+  }));
+  assert.equal(failedActive.assignment_result, 'failed');
+  assert.equal(failedActive.next_decision, 'resolve_failures');
+  assert.equal(failedActive.label, PUBLIC_LABEL_FAILED);
+
+  const cancelledActive = projectLocalOutcomeCardV1(localRequest({
+    assignments: [
+      {
+        assignment_id: WRITER,
+        provider: 'grok',
+        role: 'implement',
+        required: true,
+        outcome: 'cancelled',
+      },
+      {
+        assignment_id: 'lane-reviewer',
+        provider: 'cursor-local',
+        role: 'review',
+        required: false,
+        outcome: 'unfinal',
+      },
+    ],
+  }));
+  assert.equal(cancelledActive.assignment_result, 'cancelled');
+  assert.equal(cancelledActive.next_decision, 'resolve_failures');
+
+  const completedActive = projectLocalOutcomeCardV1(localRequest({
+    assignments: [
+      {
+        assignment_id: WRITER,
+        provider: 'grok',
+        role: 'implement',
+        required: true,
+        outcome: 'completed',
+      },
+      {
+        assignment_id: 'lane-reviewer',
+        provider: 'cursor-local',
+        role: 'review',
+        required: false,
+        outcome: 'unfinal',
+      },
+    ],
+  }));
+  assert.equal(completedActive.assignment_result, 'unfinal');
+  assert.equal(completedActive.next_decision, 'wait_for_completion');
+
+  const mixed = projectLocalOutcomeCardV1(localRequest({
+    assignments: [
+      {
+        assignment_id: WRITER,
+        provider: 'grok',
+        role: 'implement',
+        required: true,
+        outcome: 'failed',
+      },
+      {
+        assignment_id: 'lane-reviewer',
+        provider: 'cursor-local',
+        role: 'review',
+        required: true,
+        outcome: 'uncertain',
+      },
+      {
+        assignment_id: 'lane-optional',
+        provider: 'grok',
+        role: 'implement',
+        required: false,
+        outcome: 'unfinal',
+      },
+    ],
+  }));
+  assert.equal(mixed.assignment_result, 'failed');
+});
diff --git a/plugins/codex-co-engineer/test/r1-run-admission.test.mjs b/plugins/codex-co-engineer/test/r1-run-admission.test.mjs
index 78e4ca7..a1a4dd9 100644
--- a/plugins/codex-co-engineer/test/r1-run-admission.test.mjs
+++ b/plugins/codex-co-engineer/test/r1-run-admission.test.mjs
@@ -1,10 +1,20 @@
 import test from 'node:test';
 import assert from 'node:assert/strict';
+import { mkdtemp, readdir, rm } from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import { createRunAdmissionStore } from '../mcp/v3/run-admission-store.mjs';
 
 import { compileRunRequestV1 } from '../mcp/v3/run-request-compiler.mjs';
 import {
   createRunAdmissionRuntime,
 } from '../mcp/v3/run-admission.mjs';
+import {
+  compactOwnedCorrectionFollowV1,
+  OWNED_CORRECTION_ROUND_LIMIT,
+  OWNED_DELEGATION_SCHEMA_ID,
+  OWNED_DELEGATION_VERSION,
+} from '../mcp/v3/owned-delegation.mjs';
 
 const BASE_SHA = 'a'.repeat(40);
 const OBSERVED = Object.freeze({
@@ -917,3 +927,371 @@ for (const code of ['provider_billing_required', 'authentication_required', 'pro
     assert.equal(calls.dispatch.length, 2, 'each original lane is dispatched only once');
   });
 }
+
+function writerRequest(runId, overrides = {}) {
+  return request({
+    run_id: runId,
+    assignments: [{
+      assignment_id: 'lane-one',
+      provider: 'grok',
+      role: 'implement',
+      access: 'write',
+      write_scope: ['src/one/**'],
+      prompt: overrides.prompt ?? 'Implement lane one.',
+      expected_duration_ms: 60_000,
+    }],
+  });
+}
+
+function digestFor(label) {
+  const hex = Buffer.from(label.padEnd(32, '0')).toString('hex').slice(0, 64).padEnd(64, '0');
+  return `sha256:${hex}`;
+}
+
+function derivedRevision({
+  producerRunId,
+  childRunId,
+  round,
+  originalRunId = producerRunId,
+  digest = digestFor(childRunId),
+  prompt = 'Correct lane one.',
+}) {
+  return {
+    identity: {
+      schema: OWNED_DELEGATION_SCHEMA_ID,
+      version: OWNED_DELEGATION_VERSION,
+      digest,
+      run_id: childRunId,
+      assignment_id: 'lane-one',
+      producer_run_id: producerRunId,
+      producer_assignment_id: 'lane-one',
+    },
+    correction: {
+      schema: OWNED_DELEGATION_SCHEMA_ID,
+      version: OWNED_DELEGATION_VERSION,
+      lineage: 'owned_revision',
+      producer_run_id: producerRunId,
+      producer_assignment_id: 'lane-one',
+      reviewed_head: BASE_SHA,
+      original_run_id: originalRunId,
+      original_assignment_id: 'lane-one',
+      round,
+      limit: OWNED_CORRECTION_ROUND_LIMIT,
+    },
+    run_request: writerRequest(childRunId, { prompt }),
+  };
+}
+
+function createMemoryRevisionReservation() {
+  const reservations = new Map();
+  return async function reserveRevision(producerRunId, assignmentId, followInput) {
+    const follow = compactOwnedCorrectionFollowV1(followInput);
+    const key = `${producerRunId}\0${assignmentId}`;
+    const existing = reservations.get(key);
+    if (existing) return { reserved: false, follow: existing.follow };
+    const reservationId = `${producerRunId}:${assignmentId}:${follow.identity_digest}`;
+    reservations.set(key, { follow, reservationId });
+    return {
+      reserved: true,
+      follow,
+      release: async () => {
+        const current = reservations.get(key);
+        if (!current || current.reservationId !== reservationId) {
+          throw Object.assign(new Error('Correction reservation changed.'), { code: 'run_store_record_changed' });
+        }
+        reservations.delete(key);
+      },
+    };
+  };
+}
+
+function correctionDependencies(overrides = {}) {
+  const store = new Map();
+  const dispatches = [];
+  const rest = { ...overrides };
+  const omitReservation = rest.reserveRevision === null;
+  if (omitReservation) delete rest.reserveRevision;
+  const { dependencies } = baseDependencies({
+    requestConsent: async () => ({ status: 'approved' }),
+    inspectLane: async () => ({ status: 'completed', cursor: '1' }),
+    persistRecord: async (record) => {
+      store.set(record.run_id, JSON.stringify(record));
+    },
+    loadRecord: async (runId) => {
+      const text = store.get(runId);
+      return text ? JSON.parse(text) : null;
+    },
+    dispatchPrompt: async ({ run_id: runId, assignment }) => {
+      dispatches.push({ run_id: runId, assignment_id: assignment.assignment_id });
+      return { dispatched: true, confidence: 'authoritative', cursor: '1' };
+    },
+    ...(omitReservation ? {} : { reserveRevision: createMemoryRevisionReservation() }),
+    ...rest,
+  });
+  return { dependencies, store, dispatches };
+}
+
+test('owned revision admits one child, stays idempotent, and does not branch on different feedback', async () => {
+  const { dependencies, dispatches } = correctionDependencies();
+  const runtime = createRunAdmissionRuntime(dependencies);
+  const original = await runtime.submitRunRequest(writerRequest('correction-root'));
+  await runtime.inspectRun({ run_id: original.run_id });
+  const derived = derivedRevision({
+    producerRunId: original.run_id,
+    childRunId: 'rev-round-one',
+    round: 1,
+  });
+  const [first, concurrent] = await Promise.all([
+    runtime.submitOwnedRevision(original.run_id, derived),
+    runtime.submitOwnedRevision(original.run_id, derived),
+  ]);
+  assert.equal(concurrent.run_id, first.run_id);
+  assert.equal(first.correction.round, 1);
+  assert.equal(first.correction.original_run_id, original.run_id);
+  assert.equal(first.correction.limit, 3);
+  const producer = await runtime.inspectRun({ run_id: original.run_id });
+  assert.equal(producer.lanes[0].correction_follow.child_run_id, first.run_id);
+  const branched = derivedRevision({
+    producerRunId: original.run_id,
+    childRunId: 'rev-round-branch',
+    round: 1,
+    digest: digestFor('rev-round-branch'),
+    prompt: 'A different correction.',
+  });
+  await assert.rejects(runtime.submitOwnedRevision(original.run_id, branched), error =>
+    error.code === 'revision_child_exists' && error.message.includes(first.run_id)
+      && error.message.includes('Feedback was not applied'));
+  assert.equal(dispatches.filter((entry) => entry.run_id !== original.run_id).length, 1);
+});
+
+test('successive corrections persist lineage and exhaust before another dispatch', async () => {
+  const { dependencies, dispatches, store } = correctionDependencies();
+  const runtime = createRunAdmissionRuntime(dependencies);
+  const original = await runtime.submitRunRequest(writerRequest('correction-chain'));
+  await runtime.inspectRun({ run_id: original.run_id });
+
+  const firstDerived = derivedRevision({
+    producerRunId: original.run_id,
+    childRunId: 'rev-chain-one',
+    round: 1,
+  });
+  const first = await runtime.submitOwnedRevision(original.run_id, firstDerived);
+  await runtime.inspectRun({ run_id: first.run_id });
+
+  const secondDerived = derivedRevision({
+    producerRunId: first.run_id,
+    childRunId: 'rev-chain-two',
+    round: 2,
+    originalRunId: original.run_id,
+  });
+  const second = await runtime.submitOwnedRevision(first.run_id, secondDerived);
+  await runtime.inspectRun({ run_id: second.run_id });
+
+  const thirdDerived = derivedRevision({
+    producerRunId: second.run_id,
+    childRunId: 'rev-chain-three',
+    round: 3,
+    originalRunId: original.run_id,
+  });
+  const third = await runtime.submitOwnedRevision(second.run_id, thirdDerived);
+  const completedThird = await runtime.inspectRun({ run_id: third.run_id });
+  assert.equal(completedThird.correction.round, 3);
+  assert.equal(completedThird.correction.original_run_id, original.run_id);
+  const beforeExhaustion = dispatches.filter((entry) => entry.run_id !== original.run_id).length;
+  assert.equal(beforeExhaustion, 3);
+
+  const fourthDerived = derivedRevision({
+    producerRunId: third.run_id,
+    childRunId: 'rev-chain-four',
+    round: 3,
+    originalRunId: original.run_id,
+  });
+  await assert.rejects(
+    runtime.submitOwnedRevision(third.run_id, fourthDerived),
+    (error) => error.code === 'revision_budget_exhausted',
+  );
+  assert.equal(dispatches.filter((entry) => entry.run_id !== original.run_id).length, beforeExhaustion);
+
+  const restarted = createRunAdmissionRuntime(dependencies);
+  const inspected = await restarted.inspectRun({ run_id: third.run_id });
+  assert.equal(inspected.correction.round, 3);
+  assert.equal(inspected.correction.limit, 3);
+  assert.equal(inspected.correction.original_run_id, original.run_id);
+  assert.equal(inspected.correction.producer_run_id, second.run_id);
+  const restartedProducer = await restarted.inspectRun({ run_id: second.run_id });
+  assert.equal(restartedProducer.lanes[0].correction_follow.child_run_id, third.run_id);
+  assert.equal(store.has(third.run_id), true);
+});
+
+test('failed pre-admission attempts do not consume a round; admitted failures do not replenish', async () => {
+  let compileShouldFail = true;
+  const { dependencies, dispatches } = correctionDependencies({
+    compile: async (value, options) => {
+      if (compileShouldFail && value?.run_id === 'rev-failed-first') {
+        throw Object.assign(new Error('compile failed'), { code: 'bounded_context_overflow' });
+      }
+      return makeCompiled(value, options);
+    },
+  });
+  const runtime = createRunAdmissionRuntime(dependencies);
+  const original = await runtime.submitRunRequest(writerRequest('correction-fail'));
+  await runtime.inspectRun({ run_id: original.run_id });
+  const failedAttempt = derivedRevision({
+    producerRunId: original.run_id,
+    childRunId: 'rev-failed-first',
+    round: 1,
+  });
+  await assert.rejects(
+    runtime.submitOwnedRevision(original.run_id, failedAttempt),
+    (error) => error.code === 'bounded_context_overflow',
+  );
+  const producerAfterFailure = await runtime.inspectRun({ run_id: original.run_id });
+  assert.equal(producerAfterFailure.lanes[0].correction_follow, undefined);
+
+  compileShouldFail = false;
+  const admitted = derivedRevision({
+    producerRunId: original.run_id,
+    childRunId: 'rev-failed-second',
+    round: 1,
+    digest: digestFor('rev-failed-second'),
+  });
+  const child = await runtime.submitOwnedRevision(original.run_id, admitted);
+  assert.equal(child.correction.round, 1);
+  const branch = derivedRevision({
+    producerRunId: original.run_id,
+    childRunId: 'rev-failed-branch',
+    round: 1,
+    digest: digestFor('rev-failed-branch'),
+    prompt: 'Another correction after admission.',
+  });
+  await assert.rejects(runtime.submitOwnedRevision(original.run_id, branch), error =>
+    error.code === 'revision_child_exists' && error.message.includes(child.run_id));
+  assert.equal(dispatches.filter((entry) => entry.run_id !== original.run_id).length, 1);
+});
+
+test('separate durable runtimes admit only one correction and repeated input inspects that child', async t => {
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-revision-race-'));
+  t.after(() => rm(root, { recursive: true, force: true }));
+  const durable = createRunAdmissionStore(root);
+  const { dependencies, dispatches } = correctionDependencies({
+    loadRecord: durable.load, persistRecord: durable.save, reserveRevision: durable.reserveRevision,
+  });
+  const first = createRunAdmissionRuntime(dependencies);
+  const secondStore = createRunAdmissionStore(root);
+  const second = createRunAdmissionRuntime({ ...dependencies, loadRecord: secondStore.load,
+    persistRecord: secondStore.save, reserveRevision: secondStore.reserveRevision });
+  const original = await first.submitRunRequest(writerRequest('durable-correction-race'));
+  await first.inspectRun({ run_id: original.run_id });
+  await second.inspectRun({ run_id: original.run_id }); // Independent stale cache, same durable producer.
+  const a = derivedRevision({ producerRunId: original.run_id, childRunId: 'rev-durable-one', round: 1 });
+  const b = derivedRevision({ producerRunId: original.run_id, childRunId: 'rev-durable-two', round: 1 });
+  const replies = await Promise.allSettled([
+    first.submitOwnedRevision(original.run_id, a), second.submitOwnedRevision(original.run_id, b),
+  ]);
+  assert.equal(replies.filter(r => r.status === 'fulfilled').length, 1);
+  const failure = replies.find(r => r.status === 'rejected').reason;
+  assert.ok(['revision_child_exists', 'revision_admission_pending'].includes(failure.code));
+  assert.equal(dispatches.filter(row => row.run_id !== original.run_id).length, 1);
+  const winner = replies.find(r => r.status === 'fulfilled').value;
+  const repeated = await createRunAdmissionRuntime(dependencies).submitOwnedRevision(
+    original.run_id, winner.run_id === a.identity.run_id ? a : b,
+  );
+  assert.equal(repeated.run_id, winner.run_id);
+  assert.equal(repeated.correction.round, 1);
+  assert.equal(dispatches.filter(row => row.run_id !== original.run_id).length, 1);
+});
+
+test('durable reservation releases only a proven pre-admission failure', async t => {
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-revision-release-'));
+  t.after(() => rm(root, { recursive: true, force: true }));
+  const durable = createRunAdmissionStore(root);
+  let rejectCompile = true;
+  const { dependencies } = correctionDependencies({
+    loadRecord: durable.load, persistRecord: durable.save, reserveRevision: durable.reserveRevision,
+    compile: async request => {
+      if (request.run_id === 'rev-durable-fail' && rejectCompile) throw Object.assign(new Error('compile'), { code: 'bounded_context_overflow' });
+      return makeCompiled(request);
+    },
+    providerReady: async ({ run_id }) => ({ ready: run_id !== 'rev-durable-fail' }),
+  });
+  const runtime = createRunAdmissionRuntime(dependencies);
+  const producer = await runtime.submitRunRequest(writerRequest('durable-release-root'));
+  await runtime.inspectRun({ run_id: producer.run_id });
+  const derived = derivedRevision({ producerRunId: producer.run_id, childRunId: 'rev-durable-fail', round: 1 });
+  await assert.rejects(runtime.submitOwnedRevision(producer.run_id, derived), { code: 'bounded_context_overflow' });
+  assert.equal((await readdir(durable.directory)).filter(name => name.endsWith('.revision.json')).length, 0);
+  rejectCompile = false;
+  const admitted = await runtime.submitOwnedRevision(producer.run_id, derived);
+  assert.equal(admitted.phase, 'failed');
+  assert.equal((await readdir(durable.directory)).filter(name => name.endsWith('.revision.json')).length, 1);
+  const other = derivedRevision({ producerRunId: producer.run_id, childRunId: 'rev-durable-replacement', round: 1 });
+  await assert.rejects(runtime.submitOwnedRevision(producer.run_id, other), { code: 'revision_child_exists' });
+});
+
+test('an abandoned durable reservation never automatically replays provider work', async t => {
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-revision-pending-'));
+  t.after(() => rm(root, { recursive: true, force: true }));
+  const durable = createRunAdmissionStore(root);
+  const { dependencies, dispatches } = correctionDependencies({
+    loadRecord: durable.load, persistRecord: durable.save, reserveRevision: durable.reserveRevision,
+  });
+  const runtime = createRunAdmissionRuntime(dependencies);
+  const producer = await runtime.submitRunRequest(writerRequest('durable-pending-root'));
+  await runtime.inspectRun({ run_id: producer.run_id });
+  const derived = derivedRevision({ producerRunId: producer.run_id, childRunId: 'rev-durable-pending', round: 1 });
+  await durable.reserveRevision(producer.run_id, 'lane-one', {
+    child_run_id: derived.identity.run_id, child_assignment_id: 'lane-one', identity_digest: derived.identity.digest,
+  });
+  await assert.rejects(runtime.submitOwnedRevision(producer.run_id, derived), { code: 'revision_admission_pending' });
+  assert.equal(dispatches.filter(row => row.run_id !== producer.run_id).length, 0);
+});
+
+test('custom persistence with explicit atomic reservation admits only one concurrent correction', async () => {
+  const reserveRevision = createMemoryRevisionReservation();
+  const { dependencies, dispatches } = correctionDependencies({ reserveRevision });
+  const first = createRunAdmissionRuntime(dependencies);
+  const second = createRunAdmissionRuntime(dependencies);
+  const original = await first.submitRunRequest(writerRequest('custom-correction-race'));
+  await first.inspectRun({ run_id: original.run_id });
+  await second.inspectRun({ run_id: original.run_id });
+  const a = derivedRevision({ producerRunId: original.run_id, childRunId: 'rev-custom-one', round: 1 });
+  const b = derivedRevision({ producerRunId: original.run_id, childRunId: 'rev-custom-two', round: 1 });
+  const replies = await Promise.allSettled([
+    first.submitOwnedRevision(original.run_id, a),
+    second.submitOwnedRevision(original.run_id, b),
+  ]);
+  assert.equal(replies.filter((row) => row.status === 'fulfilled').length, 1);
+  const failure = replies.find((row) => row.status === 'rejected').reason;
+  assert.ok(['revision_child_exists', 'revision_admission_pending'].includes(failure.code));
+  assert.equal(dispatches.filter((row) => row.run_id !== original.run_id).length, 1);
+});
+
+test('custom persistence without atomic reservation fails closed instead of double-admitting', async () => {
+  const { dependencies, dispatches } = correctionDependencies({ reserveRevision: null });
+  const first = createRunAdmissionRuntime(dependencies);
+  const second = createRunAdmissionRuntime(dependencies);
+  const original = await first.submitRunRequest(writerRequest('custom-correction-unreserved'));
+  await first.inspectRun({ run_id: original.run_id });
+  await second.inspectRun({ run_id: original.run_id });
+  const a = derivedRevision({ producerRunId: original.run_id, childRunId: 'rev-unreserved-one', round: 1 });
+  const b = derivedRevision({ producerRunId: original.run_id, childRunId: 'rev-unreserved-two', round: 1 });
+  await assert.rejects(first.submitOwnedRevision(original.run_id, a), { code: 'revision_reservation_unavailable' });
+  const replies = await Promise.allSettled([
+    first.submitOwnedRevision(original.run_id, a),
+    second.submitOwnedRevision(original.run_id, b),
+  ]);
+  assert.equal(replies.filter((row) => row.status === 'fulfilled').length, 0);
+  assert.equal(replies.every((row) => row.reason?.code === 'revision_reservation_unavailable'), true);
+  assert.equal(dispatches.filter((row) => row.run_id !== original.run_id).length, 0);
+});
+
+test('ordinary non-revision runtimes remain usable without a reservation seam', async () => {
+  const { dependencies, calls } = baseDependencies({
+    requestConsent: async () => ({ approved: true }),
+  });
+  assert.equal(Object.hasOwn(dependencies, 'reserveRevision'), false);
+  const runtime = createRunAdmissionRuntime(dependencies);
+  const submitted = await runtime.submitRunRequest(request({ run_id: 'ordinary-no-reserve' }));
+  assert.equal(submitted.phase, 'running');
+  assert.deepEqual(calls.dispatch, ['lane-one', 'lane-two']);
+});
diff --git a/plugins/codex-co-engineer/test/r1-run-request-compiler.test.mjs b/plugins/codex-co-engineer/test/r1-run-request-compiler.test.mjs
index 2c37fef..b1ff41a 100644
--- a/plugins/codex-co-engineer/test/r1-run-request-compiler.test.mjs
+++ b/plugins/codex-co-engineer/test/r1-run-request-compiler.test.mjs
@@ -223,3 +223,108 @@ test('multiple writers accept disjoint static scope prefixes and reject overlapp
     (error) => error.code === 'overlapping_writer_scope',
   );
 });
+
+test('reusable preferences fill omitted providers and match explicit identity', async () => {
+  const preferred = await compileRunRequestV1(request({
+    preferences: { implement: { provider: 'grok' } },
+    assignments: [{
+      assignment_id: 'social-implementation',
+      role: 'implement',
+      access: 'write',
+      prompt: 'Implement the social ingestion slice.',
+      expected_duration_ms: 900_000,
+    }],
+  }), { observeGit });
+  const explicit = await compileRunRequestV1(request(), { observeGit });
+
+  assert.equal(preferred.assignments[0].provider, 'grok');
+  assert.equal(preferred.assignments[0].model, 'grok-4');
+  assert.equal(preferred.assignments[0].selection_source, 'preference');
+  assert.equal(explicit.assignments[0].selection_source, 'explicit');
+  assert.equal(preferred.request_idempotency_key, explicit.request_idempotency_key);
+  assert.equal(preferred.assignments[0].task_id, explicit.assignments[0].task_id);
+});
+
+test('exact assignment provider wins over a conflicting role preference', async () => {
+  const compiled = await compileRunRequestV1(request({
+    preferences: { implement: { provider: 'grok', model: 'grok-4' } },
+    assignments: [{
+      assignment_id: 'social-implementation',
+      provider: 'cursor-local',
+      role: 'implement',
+      access: 'write',
+      prompt: 'Implement the social ingestion slice.',
+      expected_duration_ms: 900_000,
+    }],
+  }), { observeGit });
+
+  assert.equal(compiled.assignments[0].provider, 'cursor-local');
+  assert.equal(compiled.assignments[0].model, 'composer-1');
+  assert.equal(compiled.assignments[0].selection_source, 'explicit');
+});
+
+test('invalid or missing preferences fail closed without substituting a provider', async () => {
+  await assert.rejects(
+    compileRunRequestV1(request({
+      assignments: [{
+        assignment_id: 'social-implementation',
+        role: 'implement',
+        access: 'write',
+        prompt: 'Implement the social ingestion slice.',
+        expected_duration_ms: 900_000,
+      }],
+    }), { observeGit }),
+    (error) => error.code === 'missing_key',
+  );
+  await assert.rejects(
+    compileRunRequestV1(request({
+      preferences: { implement: { provider: 'grok' }, rank: 1 },
+    }), { observeGit }),
+    (error) => error.code === 'unknown_key' || error.code === 'learned_routing_denied',
+  );
+  await assert.rejects(
+    compileRunRequestV1(request({
+      preferences: { implement: { provider: 'claude' } },
+      assignments: [{
+        assignment_id: 'social-implementation',
+        role: 'implement',
+        access: 'write',
+        prompt: 'Implement the social ingestion slice.',
+        expected_duration_ms: 900_000,
+      }],
+    }), { observeGit }),
+    (error) => error.code === 'preferred_provider_unavailable',
+  );
+});
+
+test('unused unknown preferences and exact assignment overrides compile', async () => {
+  const unused = await compileRunRequestV1(request({
+    preferences: {
+      implement: { provider: 'grok' },
+      review: { provider: 'claude' },
+    },
+    assignments: [{
+      assignment_id: 'social-implementation',
+      role: 'implement',
+      access: 'write',
+      prompt: 'Implement the social ingestion slice.',
+      expected_duration_ms: 900_000,
+    }],
+  }), { observeGit });
+  assert.equal(unused.assignments[0].provider, 'grok');
+  assert.equal(unused.assignments[0].selection_source, 'preference');
+
+  const overridden = await compileRunRequestV1(request({
+    preferences: { implement: { provider: 'claude' } },
+    assignments: [{
+      assignment_id: 'social-implementation',
+      provider: 'grok',
+      role: 'implement',
+      access: 'write',
+      prompt: 'Implement the social ingestion slice.',
+      expected_duration_ms: 900_000,
+    }],
+  }), { observeGit });
+  assert.equal(overridden.assignments[0].provider, 'grok');
+  assert.equal(overridden.assignments[0].selection_source, 'explicit');
+});
diff --git a/plugins/codex-co-engineer/test/r1-run-tool-adapter.test.mjs b/plugins/codex-co-engineer/test/r1-run-tool-adapter.test.mjs
index ea9eb2a..6a7a1f4 100644
--- a/plugins/codex-co-engineer/test/r1-run-tool-adapter.test.mjs
+++ b/plugins/codex-co-engineer/test/r1-run-tool-adapter.test.mjs
@@ -995,7 +995,7 @@ test('simple run defaults to compact semantics and exposes detailed diagnostics
   assert.deepEqual(Object.keys(compact), [
     'schema', 'version', 'mode', 'tool', 'operation', 'run_id', 'status', 'phase',
     'cursor', 'revision', 'assignment_count', 'authoritative_required_dispatch',
-    'lanes', 'diagnostics',
+    'lanes', 'coordination', 'diagnostics',
   ]);
   assert.equal(compact.lanes[0].prompt_dispatched, true);
   assert.equal(compact.diagnostics.view, 'diagnostics');
@@ -1060,3 +1060,254 @@ test('compact semantic finals retain actual candidate, verification, and top-lev
   assert.equal(Object.hasOwn(compact, 'experience'), false);
   assert.equal(Object.hasOwn(compact, 'blockers'), false);
 });
+
+test('unknown preferred providers return attention and do not dispatch', async () => {
+  const submitCalls = [];
+  const legacy = createAdapter();
+  const simpleRuntime = {
+    submitRunRequest: async (value) => {
+      submitCalls.push(value);
+      return { schema: 'codex-co-engineer.run-admission.v1', run_id: value.run_id, phase: 'running', status: 'running', lanes: [] };
+    },
+    inspectRun: async () => ({ schema: 'codex-co-engineer.run-admission.v1', run_id: 'ignored', phase: 'running', status: 'running', lanes: [{ assignment_id: 'x', task_id: 'y', status: 'running' }] }),
+    resumeRun: async () => ({}),
+    replyRun: async () => ({}),
+    cancelRun: async () => ({}),
+    waitRun: async () => ({}),
+  };
+  const adapter = createRunToolAdapter({ runtime: legacy.runtime, simpleRuntime });
+  const receipt = await adapter.dispatch('delegate', {
+    run_request: {
+      run_id: 'vale-hardening',
+      repo: '/tmp/repo',
+      objective: 'Implement the slice.',
+      preferences: { implement: { provider: 'claude' } },
+      assignments: [{
+        assignment_id: 'social-implementation',
+        role: 'implement',
+        prompt: 'Implement the slice.',
+      }],
+    },
+  });
+  assert.equal(receipt.persisted, false);
+  assert.equal(receipt.phase, 'not_admitted');
+  assert.equal(receipt.attention.code, 'preferred_provider_unavailable');
+  assert.equal(receipt.coordination.next_action.action, 'resubmit');
+  assert.equal(receipt.coordination.persisted, false);
+  assert.equal(receipt.coordination.run_id, null);
+  assert.equal(submitCalls.length, 0);
+  assert.equal(receipt.lanes.length, 0);
+});
+
+test('unused unknown preferences and exact assignment overrides still dispatch', async () => {
+  const submitCalls = [];
+  const legacy = createAdapter();
+  const simpleRuntime = {
+    submitRunRequest: async (value) => {
+      submitCalls.push(value);
+      return {
+        schema: 'codex-co-engineer.run-admission.v1',
+        version: 1,
+        run_id: value.run_id,
+        phase: 'running',
+        status: 'running',
+        assignment_count: 1,
+        lanes: [{
+          assignment_id: value.assignments[0].assignment_id,
+          task_id: 'ce-social',
+          provider: 'grok',
+          status: 'running',
+          phase: 'running',
+          prompt_dispatched: true,
+        }],
+      };
+    },
+    inspectRun: async () => ({}),
+    resumeRun: async () => ({}),
+    replyRun: async () => ({}),
+    cancelRun: async () => ({}),
+    waitRun: async () => ({}),
+  };
+  const adapter = createRunToolAdapter({ runtime: legacy.runtime, simpleRuntime });
+  const unused = await adapter.dispatch('delegate', {
+    run_request: {
+      run_id: 'vale-unused-review',
+      repo: '/tmp/repo',
+      objective: 'Implement the slice.',
+      preferences: {
+        implement: { provider: 'grok' },
+        review: { provider: 'claude' },
+      },
+      assignments: [{
+        assignment_id: 'social-implementation',
+        role: 'implement',
+        prompt: 'Implement the slice.',
+      }],
+    },
+  });
+  assert.equal(unused.phase, 'running');
+  const overridden = await adapter.dispatch('delegate', {
+    run_request: {
+      run_id: 'vale-explicit-override',
+      repo: '/tmp/repo',
+      objective: 'Implement the slice.',
+      preferences: { implement: { provider: 'claude' } },
+      assignments: [{
+        assignment_id: 'social-implementation',
+        role: 'implement',
+        provider: 'grok',
+        prompt: 'Implement the slice.',
+      }],
+    },
+  });
+  assert.equal(overridden.phase, 'running');
+  assert.equal(submitCalls.length, 2);
+});
+
+test('task revision without reviseRun reports unsupported instead of reconstructing stale receipts', async () => {
+  const HEAD = 'b'.repeat(40);
+  const IDEMPOTENCY = `sha256:${'d'.repeat(64)}`;
+  const submitCalls = [];
+  const legacy = createAdapter();
+  const simpleRuntime = {
+    submitRunRequest: async (value) => {
+      submitCalls.push(value);
+      return value;
+    },
+    inspectRun: async () => ({
+      schema: 'codex-co-engineer.run-admission.v1',
+      run_id: 'vale-hardening',
+      phase: 'completed',
+      status: 'completed',
+      lanes: [{ assignment_id: 'social-implementation', task_id: 'ce-social', status: 'completed' }],
+    }),
+    resumeRun: async () => ({}),
+    replyRun: async () => ({}),
+    cancelRun: async () => ({}),
+    waitRun: async () => ({}),
+  };
+  const adapter = createRunToolAdapter({ runtime: legacy.runtime, simpleRuntime });
+  const error = await errorOf(() => adapter.dispatch('task', {
+    run_id: 'vale-hardening',
+    revision: {
+      assignment_id: 'social-implementation',
+      feedback: 'Fix the failing unit tests.',
+      expected_head: HEAD,
+      expected_idempotency_key: IDEMPOTENCY,
+    },
+  }));
+  assert.equal(error.code, 'revision_unsupported');
+  assert.equal(submitCalls.length, 0);
+});
+
+test('task inspect retains persisted correction lineage from reviseRun', async () => {
+  const HEAD = 'b'.repeat(40);
+  const IDEMPOTENCY = `sha256:${'d'.repeat(64)}`;
+  const correction = {
+    schema: 'codex-co-engineer.owned-delegation.v1',
+    version: 1,
+    lineage: 'owned_revision',
+    producer_run_id: 'vale-hardening',
+    producer_assignment_id: 'social-implementation',
+    reviewed_head: HEAD,
+  };
+  let stored = null;
+  const legacy = createAdapter();
+  const simpleRuntime = {
+    submitRunRequest: async () => {
+      throw new Error('submitRunRequest must not reconstruct a correction');
+    },
+    inspectRun: async ({ run_id: runId }) => {
+      if (stored && stored.run_id === runId) return stored;
+      return {
+        schema: 'codex-co-engineer.run-admission.v1',
+        run_id: runId,
+        phase: 'completed',
+        status: 'completed',
+        lanes: [{ assignment_id: 'social-implementation', task_id: 'ce-social', status: 'completed' }],
+      };
+    },
+    resumeRun: async () => ({}),
+    replyRun: async () => ({}),
+    cancelRun: async () => ({}),
+    waitRun: async () => ({}),
+    reviseRun: async () => {
+      stored = {
+        schema: 'codex-co-engineer.run-admission.v1',
+        run_id: 'rev-abcd1234abcd1234',
+        phase: 'running',
+        status: 'running',
+        persisted: true,
+        correction,
+        lanes: [{
+          assignment_id: 'social-implementation',
+          task_id: 'ce-rev-social',
+          status: 'running',
+          phase: 'running',
+          prompt_dispatched: true,
+        }],
+      };
+      return stored;
+    },
+  };
+  const adapter = createRunToolAdapter({ runtime: legacy.runtime, simpleRuntime });
+  const revised = await adapter.dispatch('task', {
+    run_id: 'vale-hardening',
+    revision: {
+      assignment_id: 'social-implementation',
+      feedback: 'Fix the failing unit tests.',
+      expected_head: HEAD,
+      expected_idempotency_key: IDEMPOTENCY,
+    },
+  });
+  assert.equal(revised.correction.lineage, 'owned_revision');
+  assert.equal(revised.correction.reviewed_head, HEAD);
+  const inspected = await adapter.dispatch('task', { run_id: revised.run_id });
+  assert.equal(inspected.correction.lineage, 'owned_revision');
+  assert.equal(inspected.correction.producer_run_id, 'vale-hardening');
+});
+
+test('dirty or active revision requests fail closed without a new dispatch', async () => {
+  const HEAD = 'b'.repeat(40);
+  const IDEMPOTENCY = `sha256:${'d'.repeat(64)}`;
+  const submitCalls = [];
+  const legacy = createAdapter();
+  const simpleRuntime = {
+    submitRunRequest: async (value) => {
+      submitCalls.push(value);
+      return value;
+    },
+    inspectRun: async () => ({}),
+    resumeRun: async () => ({}),
+    replyRun: async () => ({}),
+    cancelRun: async () => ({}),
+    waitRun: async () => ({}),
+    reviseRun: async () => {
+      throw Object.assign(new RunContractV1Error(
+        'revision_producer_dirty',
+        'revision',
+        'A revision requires a clean producer worktree.',
+      ), { code: 'revision_producer_dirty' });
+    },
+  };
+  const adapter = createRunToolAdapter({ runtime: legacy.runtime, simpleRuntime });
+  const error = await errorOf(() => adapter.dispatch('task', {
+    run_id: 'vale-hardening',
+    revision: {
+      assignment_id: 'social-implementation',
+      feedback: 'Fix tests.',
+      expected_head: HEAD,
+      expected_idempotency_key: IDEMPOTENCY,
+    },
+  }));
+  assert.equal(error.code, 'revision_producer_dirty');
+  assert.equal(submitCalls.length, 0);
+});
+
+test('omitted revision and preferences keep legacy 3.2.1 classification', () => {
+  assert.equal(classifyRunToolCall('task', { task_id: 't1' }).mode, 'legacy');
+  assert.equal(classifyRunToolCall('delegate', {
+    task_id: 't1', provider: 'grok', repo: '/repo', prompt: 'go', expected_duration_ms: 1000,
+  }).mode, 'legacy');
+  assert.equal(classifyRunToolCall('task', { run_id: RUN_ID, revision: { assignment_id: 'a' } }).mode, 'run');
+});
diff --git a/plugins/codex-co-engineer/test/r1-supervisor-simple-run.test.mjs b/plugins/codex-co-engineer/test/r1-supervisor-simple-run.test.mjs
index e37c0fe..438ac9a 100644
--- a/plugins/codex-co-engineer/test/r1-supervisor-simple-run.test.mjs
+++ b/plugins/codex-co-engineer/test/r1-supervisor-simple-run.test.mjs
@@ -151,7 +151,7 @@ test('run request reports an actionable incomplete-runtime failure before worksp
     assert.notEqual(receipt.lanes[0].prepared, true);
     assert.equal(receipt.lanes[0].prompt_dispatched, false);
     assert.deepEqual(calls, [['runtime', 'grok']]);
-    assert.doesNotMatch(JSON.stringify(receipt), /deleted|cache|token|PRIVATE_PROMPT/iu);
+    assert.doesNotMatch(JSON.stringify(receipt), /deleted|\/cache\/|token=|secret|PRIVATE_PROMPT/iu);
   } finally {
     await rm(root, { recursive: true, force: true });
   }
diff --git a/plugins/codex-co-engineer/test/r1-usage-ledger.test.mjs b/plugins/codex-co-engineer/test/r1-usage-ledger.test.mjs
index 1203747..6e7bc26 100644
--- a/plugins/codex-co-engineer/test/r1-usage-ledger.test.mjs
+++ b/plugins/codex-co-engineer/test/r1-usage-ledger.test.mjs
@@ -25,6 +25,22 @@ import {
   unknownUsageMetricV1,
   usageIdentityFromTelemetryV1,
   validateUsageLedgerV1,
+  HOST_USAGE_KEYS,
+  MAX_COST_MILLICENTS,
+  MAX_TOKEN_COUNT,
+  MAX_USAGE_BYTES,
+  MAX_USAGE_COUNTER,
+  MAX_USAGE_DETAIL_BYTES,
+  MAX_USAGE_DURATION_MS,
+  MAX_USAGE_SUMMARY_BYTES,
+  MAX_USAGE_SUMMARY_TEXT_BYTES,
+  PROVIDER_USAGE_KEYS,
+  USAGE_BUDGET_METRICS,
+  USAGE_TOKEN_TOTALS_NON_COMPARABLE,
+  detailUsageLedgerV1,
+  projectUsageReportV1,
+  summarizeUsageLedgerV1,
+  unknownUsageReportV1,
 } from '../mcp/v3/usage-ledger.mjs';
 import { makeSubmission } from './fixtures/r1-run-store-fixtures.mjs';
 import {
@@ -535,3 +551,178 @@ test('run-runtime accepts and reopens the maximum eight-lane usage ledger', asyn
   assert.equal(inspected.usage.digest, submitted.usage.digest);
   assert.equal(inspected.usage.totals.identity_count, 8);
 });
+
+test('usage summary stays bounded, omits receipts, and does not infer savings', () => {
+  const telemetry = makeSubmission().telemetry;
+  const recorded = appendUsageReceiptV1(openUsageLedgerV1({ budgets: [] }), observation({
+    telemetry,
+    provider_usage: providerUsage({
+      input_tokens: providerReportedMetricV1(11),
+      output_tokens: providerReportedMetricV1(5),
+    }),
+    host_usage: hostUsage({
+      model_facing_bytes: hostMeasuredMetricV1(128),
+      retrievable_evidence_bytes: evidenceBytesMetricV1(64),
+      submissions: hostMeasuredMetricV1(1),
+    }),
+  }));
+  const summary = summarizeUsageLedgerV1(recorded);
+  const encoded = Buffer.byteLength(JSON.stringify(summary), 'utf8');
+  assert.equal(summary.view, 'summary');
+  assert.equal(summary.present, true);
+  assert.ok(encoded <= MAX_USAGE_SUMMARY_BYTES, encoded);
+  assert.ok(Buffer.byteLength(summary.text, 'utf8') <= MAX_USAGE_SUMMARY_TEXT_BYTES);
+  assert.equal(Object.hasOwn(summary, 'receipts'), false);
+  assert.equal(summary.savings, 'not_inferred');
+  assert.equal(summary.subscription, 'unknown');
+  assert.equal(Object.hasOwn(summary, 'native_tokens'), false);
+  const input = summary.metrics.find((row) => row.key === 'input_tokens');
+  const bytes = summary.metrics.find((row) => row.key === 'model_facing_bytes');
+  const evidence = summary.metrics.find((row) => row.key === 'retrievable_evidence_bytes');
+  assert.equal(input.source, 'provider_report');
+  assert.equal(input.trust, 'provider_untrusted');
+  assert.equal(input.unit, 'tokens');
+  assert.equal(bytes.source, 'host_measured');
+  assert.equal(bytes.unit, 'bytes');
+  assert.equal(evidence.source, 'evidence_bytes');
+  assert.equal(evidence.unit, 'bytes');
+  assert.equal(summary.unknown.includes('cost_millicents'), true);
+  assert.equal(projectUsageReportV1(recorded).view, 'summary');
+});
+
+test('missing metrics stay unknown and are never hidden zeros', () => {
+  const missing = unknownUsageReportV1('summary');
+  assert.equal(missing.present, false);
+  assert.equal(missing.identities, null);
+  assert.equal(missing.observations, null);
+  assert.equal(missing.metrics.length, 0);
+  assert.equal(missing.unknown.includes('input_tokens'), true);
+  assert.equal(JSON.stringify(missing).includes('"value":0'), false);
+  const empty = summarizeUsageLedgerV1(openUsageLedgerV1({ budgets: [] }));
+  assert.equal(empty.present, true);
+  assert.equal(empty.identities, 0);
+  assert.equal(empty.metrics.length, 0);
+  assert.equal(empty.unknown.includes('input_tokens'), true);
+  const telemetry = makeSubmission().telemetry;
+  const recorded = appendUsageReceiptV1(openUsageLedgerV1({ budgets: [] }), observation({
+    telemetry,
+    host_usage: hostUsage({ submissions: hostMeasuredMetricV1(1) }),
+  }));
+  const summary = summarizeUsageLedgerV1(recorded);
+  assert.equal(summary.metrics.find((row) => row.key === 'submissions').value, 1);
+  assert.equal(summary.unknown.includes('input_tokens'), true);
+  assert.equal(summary.metrics.some((row) => row.key === 'input_tokens'), false);
+  const detailed = detailUsageLedgerV1(recorded);
+  const input = detailed.metrics.find((row) => row.key === 'input_tokens');
+  assert.equal(input.value, null);
+  assert.equal(input.source, 'unknown');
+  assert.equal(input.trust, 'unknown');
+  assert.equal(detailed.unknown.includes('input_tokens'), true);
+  assert.equal(detailed.view, 'detail');
+  assert.match(missing.text, /native token balance is unknown/iu);
+  assert.match(missing.text, /no usage recorded/iu);
+  assert.equal(missing.text.includes('usage unknown;'), false);
+});
+
+test('heterogeneous provider token totals stay non-comparable and grouped', () => {
+  const grok = makeSubmission({ assignmentId: ASSIGNMENT_ID });
+  const cursor = makeSubmission({ assignmentId: 'docs-reviewer', runId: grok.run_id });
+  const afterGrok = appendUsageReceiptV1(openUsageLedgerV1({ budgets: [] }), observation({
+    telemetry: grok.telemetry,
+    identity: laneIdentity(grok.telemetry, {
+      assignmentId: ASSIGNMENT_ID,
+      provider: 'grok',
+      model: 'grok-4',
+    }),
+    provider_usage: providerUsage({
+      input_tokens: providerReportedMetricV1(21),
+      output_tokens: providerReportedMetricV1(8),
+    }),
+    host_usage: hostUsage({
+      submissions: hostMeasuredMetricV1(1),
+      retrievable_evidence_bytes: evidenceBytesMetricV1(16),
+    }),
+  }));
+  const both = appendUsageReceiptV1(afterGrok, observation({
+    telemetry: cursor.telemetry,
+    recordedAt: '2026-08-22T12:00:01.000Z',
+    identity: laneIdentity(cursor.telemetry, {
+      assignmentId: 'docs-reviewer',
+      provider: 'cursor-local',
+      model: 'composer-1',
+    }),
+    provider_usage: providerUsage({
+      input_tokens: providerReportedMetricV1(13),
+      output_tokens: providerReportedMetricV1(5),
+    }),
+    host_usage: hostUsage({
+      submissions: hostMeasuredMetricV1(1),
+      retrievable_evidence_bytes: evidenceBytesMetricV1(8),
+    }),
+  }));
+  const summary = summarizeUsageLedgerV1(both);
+  const detailed = detailUsageLedgerV1(both);
+  assert.equal(summary.token_totals, USAGE_TOKEN_TOTALS_NON_COMPARABLE);
+  assert.match(summary.text, /not comparable/iu);
+  assert.match(summary.text, /native token balance is unknown/iu);
+  assert.equal(summary.metrics.some((row) => row.key === 'input_tokens'), false);
+  assert.equal(detailed.token_totals, USAGE_TOKEN_TOTALS_NON_COMPARABLE);
+  const grokGroup = detailed.groups.find((row) => row.scope === 'provider' && row.key === 'grok');
+  const cursorGroup = detailed.groups.find((row) => row.scope === 'provider' && row.key === 'cursor-local');
+  assert.equal(grokGroup.metrics.find((row) => row.key === 'input_tokens').value, 21);
+  assert.equal(cursorGroup.metrics.find((row) => row.key === 'input_tokens').value, 13);
+  assert.equal(detailed.native_tokens, 'unknown');
+});
+
+test('all known metrics with large integers stay inside report caps', () => {
+  const largeTokens = 120_000_000;
+  const identities = Array.from({ length: 8 }, (_, index) => (
+    makeSubmission({ assignmentId: `usage-lane-${index + 1}` })
+  ));
+  let ledger = openUsageLedgerV1({ budgets: [] });
+  for (let index = 0; index < identities.length; index += 1) {
+    const current = identities[index];
+    ledger = appendUsageReceiptV1(ledger, observation({
+      telemetry: current.telemetry,
+      recordedAt: `2026-08-22T12:00:0${index}.000Z`,
+      identity: laneIdentity(current.telemetry, {
+        assignmentId: `usage-lane-${index + 1}`,
+        provider: index % 2 === 0 ? 'grok' : 'dsh',
+        model: index % 2 === 0 ? 'grok-4' : 'dsh-1',
+      }),
+      provider_usage: providerUsage({
+        input_tokens: providerReportedMetricV1(largeTokens),
+        output_tokens: providerReportedMetricV1(largeTokens),
+        cache_tokens: providerReportedMetricV1(largeTokens),
+      }),
+    }));
+  }
+  const summary = summarizeUsageLedgerV1(ledger);
+  const detailed = detailUsageLedgerV1(ledger);
+  const summaryBytes = Buffer.byteLength(JSON.stringify(summary), 'utf8');
+  const detailBytes = Buffer.byteLength(JSON.stringify(detailed), 'utf8');
+  assert.ok(summaryBytes <= MAX_USAGE_SUMMARY_BYTES, summaryBytes);
+  assert.ok(detailBytes <= MAX_USAGE_DETAIL_BYTES, detailBytes);
+  assert.ok(Buffer.byteLength(summary.text, 'utf8') <= MAX_USAGE_SUMMARY_TEXT_BYTES);
+  assert.equal(summary.present, true);
+  assert.equal(summary.identities, 8);
+  assert.equal(summary.token_totals, USAGE_TOKEN_TOTALS_NON_COMPARABLE);
+  assert.equal(detailed.metrics.length, USAGE_BUDGET_METRICS.length);
+  for (const key of USAGE_BUDGET_METRICS) {
+    assert.equal(detailed.metrics.some((row) => row.key === key), true, key);
+  }
+  assert.equal(PROVIDER_USAGE_KEYS.length + HOST_USAGE_KEYS.length, USAGE_BUDGET_METRICS.length);
+  assert.equal(detailed.native_tokens, 'unknown');
+  const tight = projectUsageReportV1(ledger, { view: 'detail', max_bytes: 900 });
+  assert.ok(Buffer.byteLength(JSON.stringify(tight), 'utf8') <= 900);
+  assert.equal(tight.truncation.truncated, true);
+  assert.equal(tight.truncation.reason, 'report_bound');
+  assert.equal(tight.identities, 8);
+  assert.equal(tight.present, true);
+  assert.equal(tight.token_totals, USAGE_TOKEN_TOTALS_NON_COMPARABLE);
+  assert.ok(MAX_TOKEN_COUNT >= largeTokens);
+  assert.ok(MAX_COST_MILLICENTS > largeTokens);
+  assert.ok(MAX_USAGE_BYTES > largeTokens);
+  assert.ok(MAX_USAGE_COUNTER > 0);
+  assert.ok(MAX_USAGE_DURATION_MS > 0);
+});
diff --git a/plugins/codex-co-engineer/test/run-result-evidence.test.mjs b/plugins/codex-co-engineer/test/run-result-evidence.test.mjs
new file mode 100644
index 0000000..3299d6a
--- /dev/null
+++ b/plugins/codex-co-engineer/test/run-result-evidence.test.mjs
@@ -0,0 +1,730 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { fileURLToPath } from 'node:url';
+import { readFile } from 'node:fs/promises';
+
+import { ARTIFACT_REF_SCHEMA_ID } from '../mcp/v3/artifact-ref.mjs';
+import {
+  MAX_RUN_RESULT_DETAIL_BYTES,
+  MAX_RUN_RESULT_SUMMARY_BYTES,
+  RUN_ADMISSION_RECEIPT_SCHEMA_ID,
+  RUN_RESULT_EVIDENCE_SCHEMA_ID,
+  describeRunResultEvidenceV1,
+  detailRunResultEvidenceV1,
+  projectRunResultEvidenceV1,
+  summarizeRunResultEvidenceV1,
+} from '../mcp/v3/run-result-evidence.mjs';
+import {
+  HOST_USAGE_KEYS,
+  PROVIDER_USAGE_KEYS,
+  USAGE_BUDGET_METRICS,
+  USAGE_TOKEN_TOTALS_NON_COMPARABLE,
+  appendUsageReceiptV1,
+  buildUsageIdentityV1,
+  correlateUsageAssignmentV1,
+  correlateUsageModelV1,
+  evidenceBytesMetricV1,
+  hostMeasuredMetricV1,
+  openUsageLedgerV1,
+  providerReportedMetricV1,
+  unknownHostUsageV1,
+  unknownProviderUsageV1,
+  usageIdentityFromTelemetryV1,
+} from '../mcp/v3/usage-ledger.mjs';
+import { makeSubmission } from './fixtures/r1-run-store-fixtures.mjs';
+
+const MODULE_PATH = fileURLToPath(new URL('../mcp/v3/run-result-evidence.mjs', import.meta.url));
+const RUN_ID = 'run-result-01';
+const BASE_SHA = 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa';
+const HEAD_SHA = 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb';
+const HOSTILE_PATH = '/tmp/secret-repo-do-not-leak';
+const HOSTILE_PROMPT = 'owner-only prompt with secret token';
+
+function identityFields(identity) {
+  return {
+    run_id_digest: identity.run_id_digest,
+    assignment_id_digest: identity.assignment_id_digest,
+    attempt: identity.attempt,
+    generation: identity.generation,
+    provider: identity.provider,
+    requested_model_digest: identity.requested_model_digest,
+    effective_model_digest: identity.effective_model_digest,
+    requested_effort: identity.requested_effort,
+    effective_effort: identity.effective_effort,
+  };
+}
+
+function measuredLedger() {
+  const telemetry = makeSubmission().telemetry;
+  return appendUsageReceiptV1(openUsageLedgerV1({ budgets: [] }), {
+    seq: 1,
+    recorded_at: '2026-09-10T12:00:00.000Z',
+    identity: identityFields(usageIdentityFromTelemetryV1(telemetry, {
+      requested_effort: null,
+      effective_effort: 'high',
+    })),
+    provider_usage: {
+      ...unknownProviderUsageV1(),
+      input_tokens: providerReportedMetricV1(21),
+      output_tokens: providerReportedMetricV1(8),
+    },
+    host_usage: {
+      ...unknownHostUsageV1(),
+      model_facing_bytes: hostMeasuredMetricV1(256),
+      retrievable_evidence_bytes: evidenceBytesMetricV1(96),
+      submissions: hostMeasuredMetricV1(1),
+    },
+  });
+}
+
+function artifactRef() {
+  return {
+    schema: ARTIFACT_REF_SCHEMA_ID,
+    run_id: RUN_ID,
+    assignment_id: 'lane-writer',
+    artifact_kind: 'git_diff',
+    artifact_class: 'sanitized',
+    relative_path: `runs/${RUN_ID}/lane-writer/diff-1.patch`,
+    byte_length: 128,
+    sha256: 'ab'.repeat(32),
+    media_type: 'text/plain',
+    content_encoding: 'identity',
+  };
+}
+
+function receipt(overrides = {}) {
+  const result = {
+    schema: RUN_ADMISSION_RECEIPT_SCHEMA_ID,
+    version: 1,
+    run_id: RUN_ID,
+    phase: 'completed',
+    status: 'completed',
+    base_sha: BASE_SHA,
+    git: { base_sha: BASE_SHA, digest: 'sha256:not-copied' },
+    objective: HOSTILE_PROMPT,
+    complete_candidate_blocked: false,
+    lanes: [{
+      assignment_id: 'lane-writer',
+      provider: 'grok',
+      role: 'implement',
+      required: true,
+      phase: 'completed',
+      status: 'completed',
+      head: HEAD_SHA,
+      result: HOSTILE_PROMPT,
+      handoff: {
+        worktree: HOSTILE_PATH,
+        current_head: HEAD_SHA,
+        branch: 'ce/lane-writer',
+      },
+      artifact_refs: [artifactRef()],
+    }],
+    ...overrides,
+  };
+  return { ...result, lanes: result.lanes.map(lane => ({
+    prompt_dispatched: true, dispatch_confidence: 'authoritative', task_final: true, clean: true, ...lane,
+  })) };
+}
+
+test('describe seam keeps the exported projection API', () => {
+  const inventory = describeRunResultEvidenceV1();
+  assert.equal(inventory.schema, RUN_RESULT_EVIDENCE_SCHEMA_ID);
+  assert.equal(Object.hasOwn(inventory, 'public_mcp'), false);
+  assert.equal(Object.hasOwn(inventory, 'parent_wiring_required'), false);
+  assert.equal(inventory.completed_is_not_accepted, true);
+  assert.equal(inventory.default_view, 'summary');
+  assert.deepEqual([...inventory.api], [
+    'describeRunResultEvidenceV1',
+    'detailRunResultEvidenceV1',
+    'projectRunResultEvidenceV1',
+    'summarizeRunResultEvidenceV1',
+  ]);
+});
+
+test('completed admission work is not Codex acceptance', () => {
+  const summary = summarizeRunResultEvidenceV1(receipt());
+  assert.equal(summary.schema, RUN_RESULT_EVIDENCE_SCHEMA_ID);
+  assert.equal(summary.assignment_result, 'completed');
+  assert.equal(summary.codex_accepted, false);
+  assert.equal(summary.review_needed, true);
+  assert.equal(summary.next_decision, 'review_candidate');
+  assert.equal(Object.hasOwn(summary, 'public_mcp'), false);
+  assert.equal(summary.view, 'summary');
+  assert.equal(summary.candidate.head, HEAD_SHA);
+  assert.equal(Object.hasOwn(summary, 'assignments'), false);
+  assert.match(summary.text, /needs review/u);
+  assert.equal(summary.text.includes('not_accepted'), false);
+});
+
+test('failed, uncertain, and unfinal states stay distinct', () => {
+  const failed = summarizeRunResultEvidenceV1(receipt({
+    phase: 'failed',
+    status: 'failed',
+    lanes: [{
+      assignment_id: 'lane-writer',
+      provider: 'grok',
+      role: 'implement',
+      required: true,
+      phase: 'failed_pre_prompt',
+      status: 'failed_pre_prompt',
+      head: null,
+    }],
+  }));
+  assert.equal(failed.assignment_result, 'failed');
+  assert.equal(failed.next_decision, 'resolve_failures');
+  assert.equal(failed.codex_accepted, false);
+
+  const uncertain = summarizeRunResultEvidenceV1(receipt({
+    phase: 'needs_attention',
+    status: 'needs_attention',
+    lanes: [{
+      assignment_id: 'lane-writer',
+      provider: 'grok',
+      role: 'implement',
+      required: true,
+      phase: 'needs_attention',
+      status: 'needs_attention',
+      dispatch_confidence: 'uncertain',
+    }],
+  }));
+  assert.equal(uncertain.assignment_result, 'uncertain');
+  assert.equal(uncertain.unresolved, true);
+  assert.equal(uncertain.next_decision, 'inspect_unresolved');
+
+  const unfinal = summarizeRunResultEvidenceV1(receipt({
+    phase: 'running',
+    status: 'running',
+    lanes: [{
+      assignment_id: 'lane-writer',
+      provider: 'grok',
+      role: 'implement',
+      required: true,
+      phase: 'running',
+      status: 'running',
+    }],
+  }));
+  assert.equal(unfinal.assignment_result, 'unfinal');
+  assert.equal(unfinal.next_decision, 'wait_for_completion');
+});
+
+test('missing metrics stay unknown and measured facts keep their source', () => {
+  const missing = summarizeRunResultEvidenceV1(receipt());
+  assert.equal(missing.usage.present, false);
+  assert.equal(missing.usage.identities, null);
+  assert.equal(missing.usage.metrics.length, 0);
+  assert.equal(missing.usage.unknown.includes('input_tokens'), true);
+  assert.equal(JSON.stringify(missing.usage).includes('"value":0'), false);
+
+  const detailed = detailRunResultEvidenceV1({
+    receipt: receipt(),
+    usage_ledger: measuredLedger(),
+    artifacts: [artifactRef()],
+  });
+  assert.equal(detailed.view, 'detail');
+  const input = detailed.usage.metrics.find((row) => row.key === 'input_tokens');
+  const bytes = detailed.usage.metrics.find((row) => row.key === 'model_facing_bytes');
+  const evidence = detailed.usage.metrics.find((row) => row.key === 'retrievable_evidence_bytes');
+  assert.equal(input.source, 'provider_report');
+  assert.equal(input.trust, 'provider_untrusted');
+  assert.equal(input.unit, 'tokens');
+  assert.equal(bytes.source, 'host_measured');
+  assert.equal(bytes.unit, 'bytes');
+  assert.equal(evidence.source, 'evidence_bytes');
+  assert.equal(evidence.unit, 'bytes');
+  assert.equal(detailed.usage.unknown.includes('cost_millicents'), true);
+  assert.equal(detailed.usage.savings, 'not_inferred');
+  assert.equal(detailed.usage.subscription, 'unknown');
+  assert.equal(detailed.usage.native_tokens, 'unknown');
+  assert.equal(detailed.artifacts.length, 1);
+  assert.equal(detailed.assignments[0].outcome, 'completed');
+  assert.equal(Object.hasOwn(detailed, 'outcome'), false);
+});
+
+test('shareable projection is bounded and omits owner-only prompts and paths', async () => {
+  const summary = projectRunResultEvidenceV1(receipt(), { view: 'summary' });
+  const encoded = Buffer.byteLength(JSON.stringify(summary), 'utf8');
+  assert.ok(encoded <= MAX_RUN_RESULT_SUMMARY_BYTES, encoded);
+  const text = JSON.stringify(summary);
+  assert.equal(text.includes(HOSTILE_PATH), false);
+  assert.equal(text.includes(HOSTILE_PROMPT), false);
+  assert.equal(text.includes('/tmp/'), false);
+  assert.equal(text.includes('owner-only prompt'), false);
+  const source = await readFile(MODULE_PATH, 'utf8');
+  assert.equal(source.includes('server.mjs'), false);
+  assert.equal(source.includes('run-admission.mjs'), false);
+  assert.equal(source.includes('run-runtime.mjs'), false);
+});
+
+function writerLane(overrides = {}) {
+  return {
+    assignment_id: 'lane-writer',
+    provider: 'grok',
+    role: 'implement',
+    required: true,
+    phase: 'completed',
+    status: 'completed',
+    head: HEAD_SHA,
+    ...overrides,
+  };
+}
+
+test('mismatched run and lane states stay coherent', () => {
+  const failedWithOutput = summarizeRunResultEvidenceV1(receipt({
+    phase: 'failed',
+    status: 'failed',
+    lanes: [writerLane({
+      phase: 'completed',
+      status: 'completed',
+      head: HEAD_SHA,
+    })],
+  }));
+  assert.equal(failedWithOutput.assignment_result, 'failed');
+  assert.equal(failedWithOutput.label, 'Failed');
+  assert.equal(failedWithOutput.next_decision, 'resolve_failures');
+  assert.equal(failedWithOutput.review_needed, false);
+  assert.match(failedWithOutput.text, /failed/iu);
+  assert.equal(failedWithOutput.unresolved, false);
+
+  const failedDetail = detailRunResultEvidenceV1(receipt({
+    phase: 'failed',
+    status: 'failed',
+    lanes: [writerLane()],
+  }));
+  assert.equal(failedDetail.assignment_result, 'failed');
+  assert.equal(failedDetail.assignments[0].outcome, 'completed');
+  assert.equal(failedDetail.assignments[0].head, HEAD_SHA);
+
+  const pending = summarizeRunResultEvidenceV1(receipt({
+    phase: 'lifecycle_pending',
+    status: 'lifecycle_pending',
+    lanes: [writerLane({
+      phase: 'completed',
+      status: 'completed',
+      task_final: false,
+    })],
+  }));
+  assert.equal(pending.assignment_result, 'uncertain');
+  assert.equal(pending.next_decision, 'inspect_unresolved');
+  assert.equal(pending.label, 'Unresolved');
+  assert.match(pending.text, /inspect/iu);
+
+  const unknownProof = summarizeRunResultEvidenceV1(receipt({
+    phase: 'completed',
+    status: 'completed',
+    lanes: [writerLane({
+      dispatch_confidence: 'unknown',
+    })],
+  }));
+  assert.equal(unknownProof.assignment_result, 'uncertain');
+  assert.equal(unknownProof.next_decision, 'inspect_unresolved');
+
+  const dirty = summarizeRunResultEvidenceV1(receipt({
+    phase: 'completed',
+    status: 'completed',
+    lanes: [writerLane({
+      clean: false,
+    })],
+  }));
+  assert.equal(dirty.assignment_result, 'uncertain');
+  assert.equal(dirty.next_decision, 'inspect_unresolved');
+
+  const terminalFailedUncertain = summarizeRunResultEvidenceV1(receipt({
+    phase: 'failed',
+    status: 'failed',
+    lanes: [writerLane({
+      phase: 'timeout',
+      status: 'timeout',
+      dispatch_confidence: 'uncertain',
+      head: HEAD_SHA,
+    })],
+  }));
+  assert.equal(terminalFailedUncertain.assignment_result, 'failed');
+  assert.equal(terminalFailedUncertain.next_decision, 'resolve_failures');
+
+  const stillRunning = summarizeRunResultEvidenceV1(receipt({
+    phase: 'running',
+    status: 'running',
+    lanes: [
+      writerLane(),
+      {
+        assignment_id: 'lane-reviewer',
+        provider: 'cursor-local',
+        role: 'review',
+        required: false,
+        phase: 'running',
+        status: 'running',
+      },
+    ],
+  }));
+  assert.equal(stillRunning.assignment_result, 'unfinal');
+  assert.equal(stillRunning.next_decision, 'wait_for_completion');
+  assert.match(stillRunning.text, /in progress/iu);
+});
+
+test('completed verify work is not treated as a passed check', () => {
+  const detailed = detailRunResultEvidenceV1(receipt({
+    lanes: [{
+      assignment_id: 'lane-verify',
+      provider: 'grok',
+      role: 'verify',
+      required: true,
+      phase: 'completed',
+      status: 'completed',
+      head: HEAD_SHA,
+    }],
+  }));
+  assert.equal(detailed.assignment_result, 'completed');
+  assert.equal(detailed.assignments[0].role, 'verify');
+  assert.equal(detailed.assignments[0].outcome, 'completed');
+  assert.equal(detailed.checks.length, 0);
+  assert.equal(detailed.codex_accepted, false);
+  assert.equal(detailed.review_needed, true);
+});
+
+test('candidate heads stay unambiguous and composition must be explicit', () => {
+  const otherHead = 'cccccccccccccccccccccccccccccccccccccccc';
+  const missingHead = summarizeRunResultEvidenceV1(receipt({
+    lanes: [
+      writerLane({ assignment_id: 'lane-writer', head: HEAD_SHA }),
+      {
+        assignment_id: 'lane-reviewer',
+        provider: 'cursor-local',
+        role: 'review',
+        required: true,
+        phase: 'completed',
+        status: 'completed',
+        head: null,
+      },
+    ],
+  }));
+  assert.equal(missingHead.candidate.head, null);
+  assert.equal(missingHead.candidate.composed, false);
+
+  const mixed = detailRunResultEvidenceV1(receipt({
+    lanes: [
+      writerLane({ assignment_id: 'lane-writer', head: HEAD_SHA }),
+      {
+        assignment_id: 'lane-docs',
+        provider: 'cursor-local',
+        role: 'implement',
+        required: true,
+        phase: 'completed',
+        status: 'completed',
+        head: otherHead,
+      },
+    ],
+  }));
+  assert.equal(mixed.candidate.head, null);
+  assert.equal(mixed.candidate.composed, false);
+  assert.equal(mixed.assignments.find((row) => row.assignment_id === 'lane-writer').head, HEAD_SHA);
+  assert.equal(mixed.assignments.find((row) => row.assignment_id === 'lane-docs').head, otherHead);
+
+  const composed = summarizeRunResultEvidenceV1({
+    receipt: receipt({
+      lanes: [
+        writerLane({ assignment_id: 'lane-writer', head: HEAD_SHA }),
+        {
+          assignment_id: 'lane-docs',
+          provider: 'cursor-local',
+          role: 'implement',
+          required: true,
+          phase: 'completed',
+          status: 'completed',
+          head: otherHead,
+        },
+      ],
+    }),
+    candidate: {
+      branch: 'ce/composed',
+      head: HEAD_SHA,
+      tree: BASE_SHA,
+      composed: true,
+    },
+  });
+  assert.equal(composed.candidate.head, HEAD_SHA);
+  assert.equal(composed.candidate.composed, true);
+
+  const single = summarizeRunResultEvidenceV1(receipt());
+  assert.equal(single.candidate.head, HEAD_SHA);
+  assert.equal(single.candidate.composed, false);
+});
+
+test('unbound or stale Codex acceptance cannot label Accepted', () => {
+  const flagOnly = summarizeRunResultEvidenceV1({
+    receipt: receipt(),
+    codex_acceptance: { accepted: true, authority: 'codex' },
+  });
+  assert.equal(flagOnly.codex_accepted, false);
+  assert.equal(flagOnly.label, 'Review needed');
+
+  const otherHead = 'cccccccccccccccccccccccccccccccccccccccc';
+  const stale = summarizeRunResultEvidenceV1({
+    receipt: receipt(),
+    codex_acceptance: {
+      accepted: true,
+      authority: 'codex',
+      run_id: RUN_ID,
+      head: otherHead,
+    },
+  });
+  assert.equal(stale.codex_accepted, false);
+
+  const bound = summarizeRunResultEvidenceV1({
+    receipt: receipt(),
+    codex_acceptance: {
+      accepted: true,
+      authority: 'codex',
+      run_id: RUN_ID,
+      head: HEAD_SHA,
+    },
+  });
+  assert.equal(bound.codex_accepted, true);
+  assert.equal(bound.label, 'Accepted');
+
+  const failed = summarizeRunResultEvidenceV1({
+    receipt: receipt({
+      phase: 'failed',
+      status: 'failed',
+      lanes: [writerLane({ phase: 'failed', status: 'failed', head: HEAD_SHA })],
+    }),
+    codex_acceptance: {
+      accepted: true,
+      authority: 'codex',
+      run_id: RUN_ID,
+      head: HEAD_SHA,
+    },
+  });
+  assert.equal(failed.codex_accepted, false);
+  assert.equal(failed.label, 'Failed');
+});
+
+function fullUsageGroup() {
+  return {
+    provider_usage: {
+      ...unknownProviderUsageV1(),
+      input_tokens: providerReportedMetricV1(120_000_000),
+      output_tokens: providerReportedMetricV1(120_000_000),
+      cache_tokens: providerReportedMetricV1(120_000_000),
+    },
+    host_usage: unknownHostUsageV1(),
+  };
+}
+
+function maxLaneId(index) {
+  return `lane-${'x'.repeat(58)}${index}`;
+}
+
+function laneUsageIdentity(telemetry, assignmentId, provider, model) {
+  const base = usageIdentityFromTelemetryV1(telemetry, {
+    requested_effort: 'max',
+    effective_effort: 'max',
+  });
+  return buildUsageIdentityV1({
+    ...identityFields(base),
+    assignment_id_digest: correlateUsageAssignmentV1(assignmentId),
+    provider,
+    requested_model_digest: correlateUsageModelV1(provider, model),
+    effective_model_digest: correlateUsageModelV1(provider, model),
+  });
+}
+
+test('maximum eight-lane known-metric outputs stay inside byte caps', () => {
+  const runId = `r${'y'.repeat(63)}`;
+  const lanes = Array.from({ length: 8 }, (_, index) => ({
+    assignment_id: maxLaneId(index),
+    provider: index % 2 === 0 ? 'grok' : 'cursor-local',
+    role: index === 7 ? 'verify' : 'implement',
+    required: true,
+    phase: 'completed',
+    status: 'completed',
+    head: index === 0 ? HEAD_SHA : (index === 1 ? 'd'.repeat(40) : null),
+  }));
+  const artifacts = lanes.map((lane, index) => ({
+    schema: ARTIFACT_REF_SCHEMA_ID,
+    run_id: runId,
+    assignment_id: lane.assignment_id,
+    artifact_kind: 'git_diff',
+    artifact_class: 'sanitized',
+    relative_path: `runs/${runId}/${lane.assignment_id}/diff-${index}.patch`,
+    byte_length: 128,
+    sha256: index.toString(16).padStart(2, '0').repeat(32),
+    media_type: 'text/plain',
+    content_encoding: 'identity',
+  }));
+  let ledger = openUsageLedgerV1({ budgets: [] });
+  for (let index = 0; index < 8; index += 1) {
+    const provider = index % 2 === 0 ? 'grok' : 'cursor-local';
+    const model = provider === 'grok' ? 'grok-4' : 'composer-1';
+    const assignmentId = maxLaneId(index);
+    const telemetry = makeSubmission({ runId, assignmentId }).telemetry;
+    const group = fullUsageGroup();
+    ledger = appendUsageReceiptV1(ledger, {
+      seq: 1,
+      recorded_at: `2026-09-10T12:00:0${index}.000Z`,
+      identity: identityFields(laneUsageIdentity(telemetry, assignmentId, provider, model)),
+      provider_usage: group.provider_usage,
+      host_usage: group.host_usage,
+    });
+  }
+  const source = {
+    receipt: receipt({
+      run_id: runId,
+      lanes,
+    }),
+    usage_ledger: ledger,
+    artifacts,
+  };
+  const summary = projectRunResultEvidenceV1(source, { view: 'summary' });
+  const detail = projectRunResultEvidenceV1(source, { view: 'detail' });
+  const summaryBytes = Buffer.byteLength(JSON.stringify(summary), 'utf8');
+  const detailBytes = Buffer.byteLength(JSON.stringify(detail), 'utf8');
+  assert.ok(summaryBytes <= MAX_RUN_RESULT_SUMMARY_BYTES, summaryBytes);
+  assert.ok(detailBytes <= MAX_RUN_RESULT_DETAIL_BYTES, detailBytes);
+  assert.equal(summary.run_id, runId);
+  assert.equal(summary.assignment_result, 'completed');
+  assert.equal(summary.candidate.head, null);
+  assert.equal(detail.assignments.length, 8);
+  assert.equal(detail.assignments[0].head, HEAD_SHA);
+  assert.equal(USAGE_BUDGET_METRICS.length, PROVIDER_USAGE_KEYS.length + HOST_USAGE_KEYS.length);
+  assert.equal(detail.usage.token_totals, USAGE_TOKEN_TOTALS_NON_COMPARABLE);
+  assert.ok(detail.usage.truncation == null || typeof detail.usage.truncation.truncated === 'boolean');
+  assert.equal(JSON.stringify(summary).includes(HOSTILE_PATH), false);
+  assert.equal(JSON.stringify(summary).includes(HOSTILE_PROMPT), false);
+});
+
+test('completed status alone cannot hide missing dispatch or final-lifecycle proof', () => {
+  for (const patch of [
+    { dispatch_confidence: undefined }, { dispatch_confidence: 'not_sent' },
+    { prompt_dispatched: false }, { task_final: undefined },
+  ]) {
+    const value = receipt();
+    for (const [key, field] of Object.entries(patch)) {
+      if (field === undefined) delete value.lanes[0][key];
+      else value.lanes[0][key] = field;
+    }
+    const report = summarizeRunResultEvidenceV1(value);
+    assert.equal(report.assignment_result, 'uncertain');
+    assert.equal(report.next_decision, 'inspect_unresolved');
+    assert.equal(report.codex_accepted, false);
+  }
+});
+
+test('completed lanes require explicit clean proof and any dirty proof wins', () => {
+  const missing = receipt();
+  delete missing.lanes[0].clean;
+  assert.equal(summarizeRunResultEvidenceV1(missing).assignment_result, 'uncertain');
+
+  const unknown = receipt({
+    lanes: [writerLane({ clean: null, handoff: { current_head: HEAD_SHA } })],
+  });
+  assert.equal(summarizeRunResultEvidenceV1(unknown).assignment_result, 'uncertain');
+
+  const falseClean = summarizeRunResultEvidenceV1(receipt({
+    lanes: [writerLane({ clean: false })],
+  }));
+  assert.equal(falseClean.assignment_result, 'uncertain');
+
+  const conflictDirtyHandoff = summarizeRunResultEvidenceV1(receipt({
+    lanes: [writerLane({
+      clean: true,
+      handoff: { current_head: HEAD_SHA, clean: false },
+    })],
+  }));
+  assert.equal(conflictDirtyHandoff.assignment_result, 'uncertain');
+
+  const conflictDirtyLane = summarizeRunResultEvidenceV1(receipt({
+    lanes: [writerLane({
+      clean: false,
+      handoff: { current_head: HEAD_SHA, clean: true },
+    })],
+  }));
+  assert.equal(conflictDirtyLane.assignment_result, 'uncertain');
+
+  const proven = summarizeRunResultEvidenceV1(receipt({
+    lanes: [writerLane({
+      clean: true,
+      handoff: { current_head: HEAD_SHA, clean: true },
+    })],
+  }));
+  assert.equal(proven.assignment_result, 'completed');
+});
+
+test('failure and cancel outrank active lanes in result evidence', () => {
+  const failedActive = summarizeRunResultEvidenceV1(receipt({
+    phase: 'running',
+    status: 'running',
+    lanes: [
+      writerLane({ phase: 'failed', status: 'failed', required: true }),
+      {
+        assignment_id: 'lane-reviewer',
+        provider: 'cursor-local',
+        role: 'review',
+        required: false,
+        phase: 'running',
+        status: 'running',
+      },
+    ],
+  }));
+  assert.equal(failedActive.assignment_result, 'failed');
+  assert.equal(failedActive.next_decision, 'resolve_failures');
+
+  const cancelledActive = summarizeRunResultEvidenceV1(receipt({
+    phase: 'running',
+    status: 'running',
+    lanes: [
+      writerLane({ phase: 'cancelled', status: 'cancelled', required: true }),
+      {
+        assignment_id: 'lane-reviewer',
+        provider: 'cursor-local',
+        role: 'review',
+        required: false,
+        phase: 'running',
+        status: 'running',
+      },
+    ],
+  }));
+  assert.equal(cancelledActive.assignment_result, 'cancelled');
+
+  const completedActive = summarizeRunResultEvidenceV1(receipt({
+    phase: 'running',
+    status: 'running',
+    lanes: [
+      writerLane({ required: true }),
+      {
+        assignment_id: 'lane-reviewer',
+        provider: 'cursor-local',
+        role: 'review',
+        required: false,
+        phase: 'running',
+        status: 'running',
+      },
+    ],
+  }));
+  assert.equal(completedActive.assignment_result, 'unfinal');
+
+  const mixed = summarizeRunResultEvidenceV1(receipt({
+    phase: 'needs_attention',
+    status: 'needs_attention',
+    lanes: [
+      writerLane({ phase: 'failed', status: 'failed', required: true }),
+      {
+        assignment_id: 'lane-reviewer',
+        provider: 'cursor-local',
+        role: 'review',
+        required: true,
+        phase: 'needs_attention',
+        status: 'needs_attention',
+        dispatch_confidence: 'uncertain',
+      },
+      {
+        assignment_id: 'lane-optional',
+        provider: 'grok',
+        role: 'implement',
+        required: false,
+        phase: 'running',
+        status: 'running',
+      },
+    ],
+  }));
+  assert.equal(mixed.assignment_result, 'failed');
+});
diff --git a/plugins/codex-co-engineer/test/v3-acp-worker.test.mjs b/plugins/codex-co-engineer/test/v3-acp-worker.test.mjs
index 9f41d11..3b51c9d 100644
--- a/plugins/codex-co-engineer/test/v3-acp-worker.test.mjs
+++ b/plugins/codex-co-engineer/test/v3-acp-worker.test.mjs
@@ -1,5 +1,5 @@
 import assert from 'node:assert/strict';
-import { access, mkdtemp, mkdir, readFile, readdir } from 'node:fs/promises';
+import { access, mkdtemp, mkdir, readFile, readdir, writeFile } from 'node:fs/promises';
 import { tmpdir } from 'node:os';
 import path from 'node:path';
 import test from 'node:test';
@@ -31,6 +31,7 @@ async function fixture(extra = {}) {
   const root = await mkdtemp(path.join(tmpdir(), 'co-engineer-v3-acp-'));
   const cwd = path.join(root, 'worktree');
   await mkdir(cwd);
+  const timeoutMs = extra.timeoutMs ?? 5_000;
   await createTask({
     root,
     prompt: extra.prompt ?? 'review this repository',
@@ -42,12 +43,100 @@ async function fixture(extra = {}) {
       cwd,
       agent_argv: extra.agentArgv ?? [process.execPath, FAKE_AGENT, '--mode', extra.mode ?? 'normal'],
       ...(extra.cliArgv ? { cli_argv: extra.cliArgv } : {}),
-      timeout_ms: extra.timeoutMs ?? 5_000,
+      timeout_ms: timeoutMs,
+      deadline_at: extra.deadlineAt ?? new Date(Date.now() + timeoutMs).toISOString(),
     },
   });
   return { root, cwd, taskId: extra.id ?? 'task-1' };
 }
 
+/** Minimal ACP agent used only by deadline-extension / timeout-truth tests. */
+async function writeDeadlineAgent(root, behavior) {
+  const agentPath = path.join(root, `deadline-agent-${behavior}.mjs`);
+  await writeFile(agentPath, `import { createInterface } from 'node:readline';
+import { writeFile } from 'node:fs/promises';
+import { join } from 'node:path';
+const behavior = ${JSON.stringify(behavior)};
+function send(message) { process.stdout.write(JSON.stringify(message) + '\\n'); }
+function response(id, result) { send({ jsonrpc: '2.0', id, result }); }
+const pending = new Map();
+async function handle(message) {
+  const { id, method, params = {} } = message;
+  if (method === 'initialize') {
+    return response(id, {
+      protocolVersion: 1,
+      agentCapabilities: { loadSession: false, sessionCapabilities: { close: {} } },
+    });
+  }
+  if (method === 'notifications/initialized' || method === 'initialized') return;
+  if (method === 'session/new') return response(id, { sessionId: 'deadline-session' });
+  if (method === 'session/close') {
+    await writeFile(join(process.cwd(), '.acpx-fake-close.json'), JSON.stringify(params) + '\\n');
+    return response(id, {});
+  }
+  if (method === 'session/cancel') {
+    if (behavior === 'hostile' || behavior === 'partial-hostile') return;
+    for (const [promptId, entry] of pending) {
+      if (entry.timer) clearTimeout(entry.timer);
+      response(promptId, { stopReason: 'cancelled' });
+      pending.delete(promptId);
+    }
+    return;
+  }
+  if (method === 'session/prompt') {
+    send({
+      jsonrpc: '2.0',
+      method: 'session/update',
+      params: {
+        sessionId: params.sessionId,
+        update: {
+          sessionUpdate: 'agent_message_chunk',
+          content: { type: 'text', text: 'partial-before-timeout' },
+        },
+      },
+    });
+    if (behavior === 'extend-complete') {
+      const timer = setTimeout(() => {
+        send({
+          jsonrpc: '2.0',
+          method: 'session/update',
+          params: {
+            sessionId: params.sessionId,
+            update: {
+              sessionUpdate: 'agent_message_chunk',
+              content: { type: 'text', text: '+done-after-extend' },
+            },
+          },
+        });
+        response(id, { stopReason: 'end_turn' });
+        pending.delete(id);
+      }, 1_500);
+      pending.set(id, { timer });
+      return;
+    }
+    if (behavior === 'slow-cooperative') {
+      const timer = setTimeout(() => {
+        response(id, { stopReason: 'end_turn' });
+        pending.delete(id);
+      }, 2_000);
+      pending.set(id, { timer });
+      return;
+    }
+    pending.set(id, {});
+    return;
+  }
+}
+const input = createInterface({ input: process.stdin, crlfDelay: Infinity, terminal: false });
+process.stdin.resume();
+input.on('line', (line) => {
+  try { handle(JSON.parse(line)); } catch { /* ignore malformed frames */ }
+});
+process.once('SIGTERM', () => process.exit(0));
+process.once('SIGINT', () => process.exit(0));
+`);
+  return agentPath;
+}
+
 async function withFakeAcpx(mode, callback, options = {}) {
   const names = ['CODEX_CO_ENGINEER_ACPX_COMMAND'];
   const previous = Object.fromEntries(names.map((name) => [name, process.env[name]]));
@@ -773,3 +862,174 @@ test('title-only ACP questions persist and continue the real worker session', as
     await running?.catch(() => {});
   }
 });
+
+test('deadline extension lets an ACP turn finish after the original deadline', async () => {
+  const root = await mkdtemp(path.join(tmpdir(), 'co-engineer-v3-acp-extend-'));
+  const cwd = path.join(root, 'worktree');
+  await mkdir(cwd);
+  const agent = await writeDeadlineAgent(root, 'extend-complete');
+  const now = Date.now();
+  const taskId = 'deadline-extend-complete';
+  await createTask({
+    root,
+    prompt: 'finish after extension',
+    record: {
+      id: taskId,
+      status: 'accepted',
+      provider: 'grok',
+      cwd,
+      agent_argv: [process.execPath, agent],
+      timeout_ms: 700,
+      deadline_at: new Date(now + 700).toISOString(),
+    },
+  });
+  setTimeout(() => {
+    updateTask(root, taskId, {
+      deadline_at: new Date(Date.now() + 2_500).toISOString(),
+      timeout_ms: 2_500,
+      deadline_source: 'extended',
+      deadline_extensions: [{ reason: 'provider still making progress', at: new Date().toISOString() }],
+    }).catch(() => {});
+  }, 250);
+  const terminal = await runAcpTask({ root, taskId });
+  assert.equal(terminal.status, 'completed');
+  assert.equal(terminal.result, 'partial-before-timeout+done-after-extend');
+  assert.equal(terminal.prompt_dispatched, true);
+  assert.equal(terminal.cleanup.acp_close, 'closed');
+});
+
+test('extended deadline expiry times out instead of completing with partial text', async () => {
+  const root = await mkdtemp(path.join(tmpdir(), 'co-engineer-v3-acp-expire-'));
+  const cwd = path.join(root, 'worktree');
+  await mkdir(cwd);
+  const agent = await writeDeadlineAgent(root, 'partial-hostile');
+  const now = Date.now();
+  const taskId = 'deadline-extend-expire';
+  await createTask({
+    root,
+    prompt: 'expire at the new deadline',
+    record: {
+      id: taskId,
+      status: 'accepted',
+      provider: 'grok',
+      cwd,
+      agent_argv: [process.execPath, agent],
+      timeout_ms: 500,
+      deadline_at: new Date(now + 500).toISOString(),
+    },
+  });
+  setTimeout(() => {
+    updateTask(root, taskId, {
+      deadline_at: new Date(Date.now() + 800).toISOString(),
+      timeout_ms: 800,
+      deadline_source: 'extended',
+    }).catch(() => {});
+  }, 200);
+  const started = Date.now();
+  await assert.rejects(
+    runAcpTask({ root, taskId }),
+    (error) => error.code === 'timeout',
+  );
+  const elapsed = Date.now() - started;
+  assert.ok(elapsed >= 700, `expected expiry near the extended deadline, got ${elapsed}ms`);
+  assert.ok(elapsed < 2_500, `deadline watch should not wait on the original fixed turn timer drain (${elapsed}ms)`);
+  const { task } = await readTask(root, taskId);
+  assert.equal(task.status, 'timeout');
+  assert.notEqual(task.status, 'completed');
+  assert.equal(task.prompt_dispatched, true);
+  assert.equal(task.cleanup.acp_close, 'closed');
+});
+
+test('partial agent text before timeout cannot create a false success', async () => {
+  const root = await mkdtemp(path.join(tmpdir(), 'co-engineer-v3-acp-partial-'));
+  const cwd = path.join(root, 'worktree');
+  await mkdir(cwd);
+  const agent = await writeDeadlineAgent(root, 'partial-hostile');
+  const taskId = 'partial-timeout-truth';
+  await createTask({
+    root,
+    prompt: 'partial then hang',
+    record: {
+      id: taskId,
+      status: 'accepted',
+      provider: 'grok',
+      cwd,
+      agent_argv: [process.execPath, agent],
+      timeout_ms: 600,
+      deadline_at: new Date(Date.now() + 600).toISOString(),
+    },
+  });
+  await assert.rejects(
+    runAcpTask({ root, taskId }),
+    (error) => error.code === 'timeout',
+  );
+  const { task } = await readTask(root, taskId);
+  assert.equal(task.status, 'timeout');
+  assert.equal(task.result ?? null, null);
+  const events = await readFile(path.join(root, 'tasks', taskId, 'events.jsonl'), 'utf8');
+  assert.match(events, /partial-before-timeout/u);
+  assert.match(events, /"status":"timeout"/u);
+  assert.doesNotMatch(events, /"status":"completed"/u);
+});
+
+test('explicit cancellation is distinct from deadline timeout', async () => {
+  const root = await mkdtemp(path.join(tmpdir(), 'co-engineer-v3-acp-cancel-'));
+  const cwd = path.join(root, 'worktree');
+  await mkdir(cwd);
+  const agent = await writeDeadlineAgent(root, 'slow-cooperative');
+  const taskId = 'explicit-cancel';
+  await createTask({
+    root,
+    prompt: 'cancel me',
+    record: {
+      id: taskId,
+      status: 'accepted',
+      provider: 'grok',
+      cwd,
+      agent_argv: [process.execPath, agent],
+      timeout_ms: 5_000,
+      deadline_at: new Date(Date.now() + 5_000).toISOString(),
+    },
+  });
+  const controller = new AbortController();
+  const running = runAcpTask({ root, taskId, signal: controller.signal });
+  await new Promise((resolve) => setTimeout(resolve, 250));
+  controller.abort();
+  await assert.rejects(running, (error) => error.code === 'cancelled');
+  const { task } = await readTask(root, taskId);
+  assert.equal(task.status, 'cancelled');
+  assert.equal(task.prompt_dispatched, true);
+  assert.equal(task.cleanup.acp_close, 'closed');
+  const events = await readFile(path.join(root, 'tasks', taskId, 'events.jsonl'), 'utf8');
+  assert.match(events, /"status":"cancelled"/u);
+  assert.doesNotMatch(events, /"status":"timeout"/u);
+});
+
+test('accepted-prompt ACP tasks do not replay through a second startTurn', async () => {
+  const value = await fixture({ id: 'no-replay-after-dispatch', timeoutMs: 3_000 });
+  await updateTask(value.root, value.taskId, {
+    status: 'running',
+    transport: 'acp',
+    prompt_dispatched: true,
+    dispatch_evidence: 'authoritative',
+    acp_session_id: 'already-dispatched-session',
+  });
+  await assert.rejects(
+    runAcpTask({ root: value.root, taskId: value.taskId }),
+    (error) => error.code === 'transport_lost',
+  );
+  const reconnect = await reconnectAcpTask({
+    root: value.root,
+    taskId: value.taskId,
+    runtimeFactory: async () => ({
+      ensureSession: async () => ({ backendSessionId: 'already-dispatched-session' }),
+      getStatus: async () => ({}),
+      startTurn: () => {
+        throw new Error('startTurn must not run during reconnect');
+      },
+      close: async () => {},
+    }),
+  });
+  assert.equal(reconnect.reconnected, true);
+  assert.equal(reconnect.prompt_replayed, false);
+});
diff --git a/plugins/codex-co-engineer/test/v3-server.test.mjs b/plugins/codex-co-engineer/test/v3-server.test.mjs
index 11e18d1..6891bef 100644
--- a/plugins/codex-co-engineer/test/v3-server.test.mjs
+++ b/plugins/codex-co-engineer/test/v3-server.test.mjs
@@ -97,7 +97,7 @@ test('advertises only the thin public tool surface', async () => {
   ]);
   assert.equal(values[0].result.serverInfo.name, 'codex-co-engineer');
   assert.equal(values[0].result.serverInfo.title, 'Codex-Co-Engineer');
-  assert.equal(values[0].result.serverInfo.version, '3.4.2');
+  assert.equal(values[0].result.serverInfo.version, '3.4.3');
   assert.deepEqual(values[1].result.tools.map((tool) => tool.name), ['status', 'delegate', 'task', 'tasks', 'cancel']);
   assert.equal(values[1].result.tools.length, 5);
   const statusTool = values[1].result.tools.find((tool) => tool.name === 'status');
@@ -108,7 +108,7 @@ test('advertises only the thin public tool surface', async () => {
   assert.deepEqual(Object.keys(taskTool.inputSchema.properties), [
     'task_id', 'wait_ms', 'wait_until', 'wake_on_needs_attention', 'view', 'cursor', 'max_bytes',
     'extend_expected_duration_ms', 'extend_reason', 'reply', 'response_mode',
-    'run_id', 'assignment_id', 'attention', 'run_reply',
+    'run_id', 'assignment_id', 'attention', 'run_reply', 'revision',
   ]);
   assert.equal(taskTool.inputSchema.properties.wait_ms.maximum, 14400000);
   assert.equal(taskTool.inputSchema.properties.wait_until.enum[0], 'progress');
@@ -157,8 +157,14 @@ test('advertises only the thin public tool surface', async () => {
   assert.equal(delegateTool.inputSchema.properties.run.properties.assignments.maxItems, 8);
   const runRequestAssignment = delegateTool.inputSchema.properties.run_request.properties.assignments.items;
   assert.equal(runRequestAssignment.required.includes('role'), true);
+  assert.equal(runRequestAssignment.required.includes('provider'), false);
   assert.equal(runRequestAssignment.required.includes('access'), false);
   assert.equal(runRequestAssignment.required.includes('expected_duration_ms'), false);
+  assert.ok(Object.hasOwn(delegateTool.inputSchema.properties.run_request.properties, 'preferences'));
+  assert.ok(Object.hasOwn(taskTool.inputSchema.properties, 'revision'));
+  assert.deepEqual(taskTool.inputSchema.properties.revision.required, [
+    'assignment_id', 'feedback', 'expected_head', 'expected_idempotency_key',
+  ]);
   assert.equal(runRequestAssignment.properties.expected_duration_ms.default, 600000);
   assert.match(runRequestAssignment.properties.access.description, /derived from role/u);
   assert.match(taskTool.description, /event_cursor/u);
diff --git a/plugins/codex-co-engineer/test/v3-supervisor.test.mjs b/plugins/codex-co-engineer/test/v3-supervisor.test.mjs
index c16a309..ac94de1 100644
--- a/plugins/codex-co-engineer/test/v3-supervisor.test.mjs
+++ b/plugins/codex-co-engineer/test/v3-supervisor.test.mjs
@@ -1192,3 +1192,483 @@ test('invokeRunTool preserves omitted 3.2.1 mode and R-TRUTH lifecycle authority
     await rm(root, { recursive: true, force: true });
   }
 });
+
+async function makeGitRepo(prefix) {
+  const dir = await mkdtemp(path.join(os.tmpdir(), prefix));
+  await run('git', ['-C', dir, 'init']);
+  await run('git', ['-C', dir, 'config', 'user.email', 'worker@example.com']);
+  await run('git', ['-C', dir, 'config', 'user.name', 'Worker']);
+  await writeFile(path.join(dir, 'README.md'), 'owned revision fixture\n');
+  await run('git', ['-C', dir, 'add', '.']);
+  await run('git', ['-C', dir, 'commit', '-m', 'init']);
+  const { stdout } = await run('git', ['-C', dir, 'rev-parse', 'HEAD']);
+  return { dir, head: String(stdout).trim().toLowerCase() };
+}
+
+function worktreeKey(runId, assignmentId) {
+  return `${runId}:${assignmentId}`;
+}
+
+async function createOwnedRevisionHarness(options = {}) {
+  const repo = await makeGitRepo('co-engineer-owned-src-');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'co-engineer-owned-rev-'));
+  const worktrees = new Map();
+  const dispatchCalls = [];
+  const createdTasks = new Set();
+  let inspectStatus = options.inspectStatus ?? 'completed';
+  const createTerminalTask = options.createTerminalTask !== false;
+  const dispatchResult = options.dispatchResult ?? {
+    dispatched: true,
+    confidence: 'authoritative',
+    cursor: '1',
+  };
+  const records = new Map();
+  const customPersist = options.customPersist === true;
+  const adapter = await createSupervisorRunToolAdapter({
+    root,
+    inProcess: true,
+    requestConsent: async () => ({ approved: true }),
+    providerReady: async () => ({ ready: true }),
+    processBoundaryReady: async () => ({ ready: true }),
+    verifyRepository: async () => ({ verified: true }),
+    ...(customPersist ? {
+      loadRecord: async (runId) => (records.has(runId) ? JSON.parse(records.get(runId)) : null),
+      persistRecord: async (record) => { records.set(record.run_id, JSON.stringify(record)); },
+      ...(typeof options.reserveRevision === 'function'
+        ? { reserveRevision: options.reserveRevision }
+        : {}),
+    } : {}),
+    prepareWorkspace: async ({ run_id: runId, assignment, git }) => {
+      const dest = path.join(root, 'worktrees', `${runId}-${assignment.assignment_id}`);
+      await mkdir(path.dirname(dest), { recursive: true });
+      await run('git', ['-C', git.repository_path, 'worktree', 'add', '--detach', dest, git.base_sha]);
+      worktrees.set(worktreeKey(runId, assignment.assignment_id), dest);
+      worktrees.set(assignment.assignment_id, dest);
+      return {
+        prepared: true,
+        workspace: {
+          task: assignment.task_id,
+          worktree_path: dest,
+          branch: 'main',
+          start_sha: git.base_sha,
+        },
+      };
+    },
+    dispatchPrompt: async ({ run_id: runId, assignment, git }) => {
+      dispatchCalls.push({
+        run_id: runId,
+        assignment_id: assignment.assignment_id,
+        provider: assignment.provider,
+        model: assignment.model,
+        write_scope: [...assignment.write_scope],
+        access: assignment.access,
+        prompt: assignment.prompt,
+        base_sha: git.base_sha,
+      });
+      return dispatchResult;
+    },
+    inspectLane: async ({ run_id: runId, assignment_id: assignmentId, task_id: taskId }) => {
+      const worktree = worktrees.get(worktreeKey(runId, assignmentId)) ?? worktrees.get(assignmentId);
+      if (inspectStatus !== 'completed' || typeof worktree !== 'string') {
+        return { status: inspectStatus, cursor: '1' };
+      }
+      const candidatePath = path.join(worktree, 'src', 'slice.txt');
+      try {
+        await readFile(candidatePath);
+      } catch {
+        await mkdir(path.dirname(candidatePath), { recursive: true });
+        await writeFile(candidatePath, 'producer candidate\n');
+        await run('git', ['-C', worktree, 'add', '.']);
+        await run('git', ['-C', worktree, 'commit', '-m', 'producer candidate']);
+      }
+      if (createTerminalTask && typeof taskId === 'string' && !createdTasks.has(taskId)) {
+        await createTask({
+          root,
+          prompt: 'completed producer',
+          record: {
+            id: taskId,
+            status: 'completed',
+            provider: 'grok',
+            run_id: runId,
+            assignment_id: assignmentId,
+            cwd: worktree,
+            cleanup: { status: 'normal', boundary: 'released', lock: 'released' },
+          },
+        });
+        createdTasks.add(taskId);
+      }
+      const [{ stdout: headOut }, { stdout: statusOut }] = await Promise.all([
+        run('git', ['-C', worktree, 'rev-parse', 'HEAD']),
+        run('git', ['-C', worktree, 'status', '--porcelain=v1', '--untracked-files=all']),
+      ]);
+      return {
+        status: 'completed',
+        cursor: '1',
+        workspace_inspection: {
+          current_head: String(headOut).trim().toLowerCase(),
+          clean: String(statusOut).trim() === '',
+          changed_files: [],
+          commits: [],
+        },
+      };
+    },
+  });
+  return {
+    adapter,
+    repo,
+    root,
+    worktrees,
+    dispatchCalls,
+    setInspectStatus(status) { inspectStatus = status; },
+    request() {
+      return {
+        run_id: options.run_id ?? 'vale-hardening',
+        repo: repo.dir,
+        objective: 'Implement the social ingestion slice and keep unit tests green.',
+        assignments: [{
+          assignment_id: 'social-implementation',
+          provider: 'grok',
+          role: 'implement',
+          access: 'write',
+          write_scope: ['src/**'],
+          prompt: 'Implement the social ingestion slice. Acceptance: keep node --test green.',
+          expected_duration_ms: 60_000,
+        }],
+      };
+    },
+    async close() {
+      await rm(root, { recursive: true, force: true });
+      await rm(repo.dir, { recursive: true, force: true });
+    },
+  };
+}
+
+function revisionFromPacket(packet, assignmentId, feedback) {
+  const producer = packet.producers.find((entry) => entry.assignment_id === assignmentId);
+  return {
+    assignment_id: assignmentId,
+    feedback,
+    expected_head: producer.head,
+    expected_idempotency_key: producer.request_idempotency_key,
+  };
+}
+
+test('supervisor owned revision dispatches from the public packet and rejects unsafe inputs', async () => {
+  const harness = await createOwnedRevisionHarness();
+  try {
+    const originalBase = harness.repo.head;
+    const submitted = await harness.adapter.dispatch('delegate', { run_request: harness.request() });
+    assert.equal(submitted.phase, 'running');
+    const completed = await harness.adapter.dispatch('task', { run_id: submitted.run_id });
+    assert.equal(completed.phase, 'completed');
+    assert.equal(completed.coordination.next_action.action, 'review');
+    const candidateHead = completed.coordination.producers[0].head;
+    assert.match(candidateHead, /^[0-9a-f]{40}$/u);
+    assert.notEqual(candidateHead, originalBase);
+    assert.match(completed.coordination.request_idempotency_key, /^sha256:[0-9a-f]{64}$/u);
+    assert.equal(completed.coordination.git.head, null);
+    const revision = revisionFromPacket(completed.coordination, 'social-implementation', 'Fix the failing unit tests without widening scope.');
+    const [first, concurrent] = await Promise.all([
+      harness.adapter.dispatch('task', { run_id: submitted.run_id, revision }),
+      harness.adapter.dispatch('task', { run_id: submitted.run_id, revision }),
+    ]);
+    assert.equal(concurrent.run_id, first.run_id);
+    const producerDispatches = harness.dispatchCalls.filter((entry) => entry.run_id === submitted.run_id);
+    const correctionDispatches = harness.dispatchCalls.filter((entry) => entry.run_id === first.run_id);
+    assert.equal(producerDispatches.length, 1);
+    assert.equal(correctionDispatches.length, 1);
+    assert.equal(correctionDispatches[0].base_sha, candidateHead);
+    assert.notEqual(correctionDispatches[0].base_sha, originalBase);
+    assert.equal(correctionDispatches[0].provider, 'grok');
+    assert.equal(correctionDispatches[0].model, 'grok-4');
+    assert.deepEqual(correctionDispatches[0].write_scope, ['src/**']);
+    assert.match(correctionDispatches[0].prompt, /Implement the social ingestion slice/u);
+    assert.match(correctionDispatches[0].prompt, /keep unit tests green/u);
+    assert.match(correctionDispatches[0].prompt, /Fix the failing unit tests/u);
+    assert.match(correctionDispatches[0].prompt, /fresh owned revision/u);
+    assert.equal(first.correction.lineage, 'owned_revision');
+    assert.equal(first.correction.reviewed_head, candidateHead);
+    assert.equal(concurrent.correction.lineage, 'owned_revision');
+    const correctionWorkspace = harness.worktrees.get(worktreeKey(first.run_id, 'social-implementation'));
+    assert.equal(typeof correctionWorkspace, 'string');
+    const { stdout: correctionHeadOut } = await run('git', ['-C', correctionWorkspace, 'rev-parse', 'HEAD']);
+    assert.equal(String(correctionHeadOut).trim().toLowerCase(), candidateHead);
+    const inspected = await harness.adapter.dispatch('task', { run_id: first.run_id });
+    assert.equal(inspected.correction.lineage, 'owned_revision');
+    assert.equal(inspected.correction.reviewed_head, candidateHead);
+    assert.equal(inspected.correction.producer_run_id, submitted.run_id);
+    assert.equal(inspected.correction.original_run_id, submitted.run_id);
+    assert.equal(inspected.correction.round, 1);
+    assert.equal(inspected.correction.limit, 3);
+  } finally {
+    await harness.close();
+  }
+});
+
+test('owned revision does not dispatch dirty, stale, missing, active, uncertain, or unfinal producers', async () => {
+  const dirty = await createOwnedRevisionHarness({ run_id: 'vale-dirty' });
+  try {
+    const submitted = await dirty.adapter.dispatch('delegate', { run_request: dirty.request() });
+    const completed = await dirty.adapter.dispatch('task', { run_id: submitted.run_id });
+    const revision = revisionFromPacket(completed.coordination, 'social-implementation', 'Fix tests.');
+    await writeFile(path.join(dirty.worktrees.get('social-implementation'), 'dirty.txt'), 'dirty\n');
+    await assert.rejects(
+      dirty.adapter.dispatch('task', { run_id: submitted.run_id, revision }),
+      (error) => error.code === 'revision_producer_dirty',
+    );
+    assert.equal(dirty.dispatchCalls.filter((entry) => entry.run_id !== submitted.run_id).length, 0);
+  } finally {
+    await dirty.close();
+  }
+
+  const stale = await createOwnedRevisionHarness({ run_id: 'vale-stale' });
+  try {
+    const submitted = await stale.adapter.dispatch('delegate', { run_request: stale.request() });
+    const completed = await stale.adapter.dispatch('task', { run_id: submitted.run_id });
+    const revision = revisionFromPacket(completed.coordination, 'social-implementation', 'Fix tests.');
+    const worktree = stale.worktrees.get('social-implementation');
+    await writeFile(path.join(worktree, 'stale.txt'), 'stale\n');
+    await run('git', ['-C', worktree, 'add', '.']);
+    await run('git', ['-C', worktree, 'commit', '-m', 'stale']);
+    await assert.rejects(
+      stale.adapter.dispatch('task', { run_id: submitted.run_id, revision }),
+      (error) => error.code === 'revision_producer_stale',
+    );
+  } finally {
+    await stale.close();
+  }
+
+  const missing = await createOwnedRevisionHarness({ run_id: 'vale-missing' });
+  try {
+    const submitted = await missing.adapter.dispatch('delegate', { run_request: missing.request() });
+    const completed = await missing.adapter.dispatch('task', { run_id: submitted.run_id });
+    const revision = revisionFromPacket(completed.coordination, 'social-implementation', 'Fix tests.');
+    await rm(missing.worktrees.get('social-implementation'), { recursive: true, force: true });
+    await assert.rejects(
+      missing.adapter.dispatch('task', { run_id: submitted.run_id, revision }),
+      (error) => error.code === 'revision_workspace_uninspectable',
+    );
+  } finally {
+    await missing.close();
+  }
+
+  const active = await createOwnedRevisionHarness({
+    run_id: 'vale-active',
+    inspectStatus: 'running',
+  });
+  try {
+    const submitted = await active.adapter.dispatch('delegate', { run_request: active.request() });
+    assert.equal(submitted.phase, 'running');
+    await assert.rejects(
+      active.adapter.dispatch('task', {
+        run_id: submitted.run_id,
+        revision: {
+          assignment_id: 'social-implementation',
+          feedback: 'Fix tests.',
+          expected_head: active.repo.head,
+          expected_idempotency_key: submitted.coordination.request_idempotency_key,
+        },
+      }),
+      (error) => error.code === 'revision_producer_active',
+    );
+  } finally {
+    await active.close();
+  }
+
+  const uncertain = await createOwnedRevisionHarness({
+    run_id: 'vale-uncertain',
+    dispatchResult: { dispatched: true, confidence: 'uncertain', cursor: '1' },
+  });
+  try {
+    const submitted = await uncertain.adapter.dispatch('delegate', { run_request: uncertain.request() });
+    await uncertain.adapter.dispatch('task', { run_id: submitted.run_id });
+    await assert.rejects(
+      uncertain.adapter.dispatch('task', {
+        run_id: submitted.run_id,
+        revision: {
+          assignment_id: 'social-implementation',
+          feedback: 'Fix tests.',
+          expected_head: uncertain.repo.head,
+          expected_idempotency_key: submitted.coordination.request_idempotency_key,
+        },
+      }),
+      (error) => error.code === 'revision_producer_active',
+    );
+  } finally {
+    await uncertain.close();
+  }
+
+  const unfinal = await createOwnedRevisionHarness({ run_id: 'vale-unfinal' });
+  try {
+    const submitted = await unfinal.adapter.dispatch('delegate', { run_request: unfinal.request() });
+    const completed = await unfinal.adapter.dispatch('task', { run_id: submitted.run_id });
+    const revision = revisionFromPacket(completed.coordination, 'social-implementation', 'Fix tests.');
+    await updateTask(unfinal.root, completed.lanes[0].task_id, {
+      cleanup: { status: 'pending', boundary: 'unknown', lock: 'unknown' },
+    });
+    await assert.rejects(
+      unfinal.adapter.dispatch('task', { run_id: submitted.run_id, revision }),
+      (error) => error.code === 'revision_lifecycle_unfinal',
+    );
+  } finally {
+    await unfinal.close();
+  }
+
+  const missingTask = await createOwnedRevisionHarness({
+    run_id: 'vale-missing-task',
+    createTerminalTask: false,
+  });
+  try {
+    const submitted = await missingTask.adapter.dispatch('delegate', { run_request: missingTask.request() });
+    const completed = await missingTask.adapter.dispatch('task', { run_id: submitted.run_id });
+    const revision = revisionFromPacket(completed.coordination, 'social-implementation', 'Fix tests.');
+    await assert.rejects(
+      missingTask.adapter.dispatch('task', { run_id: submitted.run_id, revision }),
+      (error) => error.code === 'revision_lifecycle_unfinal',
+    );
+    assert.equal(missingTask.dispatchCalls.filter((entry) => entry.run_id !== submitted.run_id).length, 0);
+  } finally {
+    await missingTask.close();
+  }
+});
+
+test('supervisor correction rounds stay bounded, follow one child, and retain lineage after restart', async () => {
+  const harness = await createOwnedRevisionHarness({ run_id: 'vale-bounded' });
+  try {
+    const submitted = await harness.adapter.dispatch('delegate', { run_request: harness.request() });
+    const original = await harness.adapter.dispatch('task', { run_id: submitted.run_id });
+    const firstRevision = revisionFromPacket(original.coordination, 'social-implementation', 'Fix the failing unit tests without widening scope.');
+    const first = await harness.adapter.dispatch('task', { run_id: submitted.run_id, revision: firstRevision });
+    assert.equal(first.correction.round, 1);
+    assert.equal(first.correction.original_run_id, submitted.run_id);
+    const firstDone = await harness.adapter.dispatch('task', { run_id: first.run_id });
+    assert.equal(firstDone.phase, 'completed');
+    assert.equal(firstDone.correction.round, 1);
+
+    await assert.rejects(harness.adapter.dispatch('task', {
+      run_id: submitted.run_id,
+      revision: revisionFromPacket(original.coordination, 'social-implementation', 'A different correction against the original.'),
+    }), error => error.code === 'revision_child_exists'
+      && error.message.includes(first.run_id)
+      && error.message.includes('Feedback was not applied'));
+    const repeated = await harness.adapter.dispatch('task', {
+      run_id: submitted.run_id, revision: firstRevision,
+    });
+    assert.equal(repeated.run_id, first.run_id);
+    assert.equal(harness.dispatchCalls.filter((entry) => entry.run_id === first.run_id).length, 1);
+
+    const secondRevision = revisionFromPacket(firstDone.coordination, 'social-implementation', 'Keep the tests green after the first correction.');
+    const second = await harness.adapter.dispatch('task', { run_id: first.run_id, revision: secondRevision });
+    assert.equal(second.correction.round, 2);
+    assert.equal(second.correction.original_run_id, submitted.run_id);
+    const secondDone = await harness.adapter.dispatch('task', { run_id: second.run_id });
+
+    const thirdRevision = revisionFromPacket(secondDone.coordination, 'social-implementation', 'Final bounded correction.');
+    const third = await harness.adapter.dispatch('task', { run_id: second.run_id, revision: thirdRevision });
+    assert.equal(third.correction.round, 3);
+    assert.equal(third.correction.limit, 3);
+    const thirdDone = await harness.adapter.dispatch('task', { run_id: third.run_id });
+    assert.equal(thirdDone.phase, 'completed');
+    assert.equal(thirdDone.coordination.next_action.action, 'review');
+    assert.equal(thirdDone.coordination.available_actions.includes('revision'), false);
+    assert.equal(thirdDone.coordination.available_actions.includes('resubmit'), true);
+
+    const correctionDispatches = harness.dispatchCalls.filter((entry) => entry.run_id !== submitted.run_id);
+    assert.equal(correctionDispatches.length, 3);
+    await assert.rejects(
+      harness.adapter.dispatch('task', {
+        run_id: third.run_id,
+        revision: revisionFromPacket(thirdDone.coordination, 'social-implementation', 'This exceeds the fixed ceiling.'),
+      }),
+      (error) => error.code === 'revision_budget_exhausted'
+        && /submit a new bounded assignment/u.test(error.message),
+    );
+    assert.equal(harness.dispatchCalls.filter((entry) => entry.run_id !== submitted.run_id).length, 3);
+
+    const restarted = await createSupervisorRunToolAdapter({
+      root: harness.root,
+      inProcess: true,
+      requestConsent: async () => ({ approved: true }),
+      providerReady: async () => ({ ready: true }),
+      processBoundaryReady: async () => ({ ready: true }),
+      verifyRepository: async () => ({ verified: true }),
+    });
+    const inspected = await restarted.dispatch('task', { run_id: third.run_id });
+    assert.equal(inspected.correction.round, 3);
+    assert.equal(inspected.correction.limit, 3);
+    assert.equal(inspected.correction.original_run_id, submitted.run_id);
+    assert.equal(inspected.correction.producer_run_id, second.run_id);
+    assert.equal(inspected.correction.reviewed_head, secondDone.coordination.producers[0].head);
+    const inspectedOriginal = await restarted.dispatch('task', { run_id: submitted.run_id });
+    assert.equal(inspectedOriginal.coordination.next_action.action, 'inspect');
+    assert.equal(inspectedOriginal.coordination.next_action.run_id, first.run_id);
+  } finally {
+    await harness.close();
+  }
+});
+
+function createMemoryRevisionReservation() {
+  const reservations = new Map();
+  return async function reserveRevision(producerRunId, assignmentId, follow) {
+    const key = `${producerRunId}\0${assignmentId}`;
+    const existing = reservations.get(key);
+    if (existing) return { reserved: false, follow: existing.follow };
+    const reservationId = `${producerRunId}:${assignmentId}:${follow.identity_digest}`;
+    reservations.set(key, { follow, reservationId });
+    return {
+      reserved: true,
+      follow,
+      release: async () => {
+        const current = reservations.get(key);
+        if (!current || current.reservationId !== reservationId) {
+          throw Object.assign(new Error('Correction reservation changed.'), { code: 'run_store_record_changed' });
+        }
+        reservations.delete(key);
+      },
+    };
+  };
+}
+
+test('supervisor custom persistence without reservation fails closed for revision', async () => {
+  const harness = await createOwnedRevisionHarness({
+    run_id: 'vale-custom-unreserved',
+    customPersist: true,
+  });
+  try {
+    const submitted = await harness.adapter.dispatch('delegate', { run_request: harness.request() });
+    const completed = await harness.adapter.dispatch('task', { run_id: submitted.run_id });
+    const revision = revisionFromPacket(completed.coordination, 'social-implementation', 'Fix tests.');
+    await assert.rejects(
+      harness.adapter.dispatch('task', { run_id: submitted.run_id, revision }),
+      (error) => error.code === 'revision_reservation_unavailable',
+    );
+    assert.equal(harness.dispatchCalls.filter((entry) => entry.run_id !== submitted.run_id).length, 0);
+  } finally {
+    await harness.close();
+  }
+});
+
+test('supervisor custom persistence with explicit reservation still admits one correction', async () => {
+  const harness = await createOwnedRevisionHarness({
+    run_id: 'vale-custom-reserved',
+    customPersist: true,
+    reserveRevision: createMemoryRevisionReservation(),
+  });
+  try {
+    const submitted = await harness.adapter.dispatch('delegate', { run_request: harness.request() });
+    const completed = await harness.adapter.dispatch('task', { run_id: submitted.run_id });
+    const revision = revisionFromPacket(completed.coordination, 'social-implementation', 'Fix the failing unit tests.');
+    const child = await harness.adapter.dispatch('task', { run_id: submitted.run_id, revision });
+    assert.equal(child.correction.round, 1);
+    await assert.rejects(
+      harness.adapter.dispatch('task', {
+        run_id: submitted.run_id,
+        revision: revisionFromPacket(completed.coordination, 'social-implementation', 'Different feedback.'),
+      }),
+      (error) => error.code === 'revision_child_exists',
+    );
+    assert.equal(harness.dispatchCalls.filter((entry) => entry.run_id !== submitted.run_id).length, 1);
+  } finally {
+    await harness.close();
+  }
+});
diff --git a/scripts/collect-coengineer-trial-usage.mjs b/scripts/collect-coengineer-trial-usage.mjs
new file mode 100644
index 0000000..d213734
--- /dev/null
+++ b/scripts/collect-coengineer-trial-usage.mjs
@@ -0,0 +1,1600 @@
+#!/usr/bin/env node
+// Offline host-accounting importer for sanitized Codex session JSONL.
+// Reads only allowlisted paths from an explicit manifest. Never mutates
+// session files. Emits benchmark-trial.v1 rows for compare-coengineer-runs.mjs
+// plus a separate breakdown and evidence digests. Provider jobs and live
+// budget setup are out of scope.
+
+import { createHash } from 'node:crypto';
+import { lstat, readFile, realpath, writeFile, stat } from 'node:fs/promises';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+import {
+  parseTrial,
+  TRIAL_SCHEMA_ID,
+  ATTEMPT_KINDS,
+  ATTEMPT_OUTCOMES,
+} from './compare-coengineer-runs.mjs';
+
+export const MANIFEST_SCHEMA_ID = 'codex-co-engineer.host-usage-manifest.v1';
+export const REPORT_SCHEMA_ID = 'codex-co-engineer.host-usage-report.v1';
+export const EVIDENCE_DIGEST_DOMAIN = 'codex-co-engineer.host-usage-evidence.v1';
+
+const SHA40 = /^[0-9a-f]{40}$/u;
+const SHA256 = /^[0-9a-f]{64}$/u;
+const ID_PATTERN = /^[a-z][a-z0-9-]{1,63}$/u;
+const SESSION_ID_PATTERN = /^[A-Za-z0-9][A-Za-z0-9._-]{0,127}$/u;
+const SETTINGS_TOKEN = /^[A-Za-z0-9][A-Za-z0-9._:-]{0,127}$/u;
+const MAX_MANIFEST_BYTES = 262_144;
+const MAX_SESSION_BYTES = 8_388_608;
+const MAX_SESSIONS = 32;
+const MAX_PHASES = 32;
+const MAX_LINES = 200_000;
+const BOOLEAN_FLAGS = Object.freeze(['--help']);
+const VALUE_FLAGS = Object.freeze(['--manifest', '--write', '--sessions-root']);
+
+const REQUIRED_COUNTERS = Object.freeze([
+  'input_tokens',
+  'cached_input_tokens',
+  'output_tokens',
+  'reasoning_output_tokens',
+  'total_tokens',
+]);
+const OPTIONAL_COUNTERS = Object.freeze(['cache_write_input_tokens']);
+const USAGE_COUNTERS = Object.freeze([...REQUIRED_COUNTERS, ...OPTIONAL_COUNTERS]);
+
+const HOST_SETTINGS_KEYS = Object.freeze(['reasoning', 'sandbox']);
+const PROVIDER_CONFIGURATION_KEYS = Object.freeze(['implement', 'review']);
+const PROVIDER_ROLE_KEYS = Object.freeze(['provider', 'model']);
+const AGENT_NAME_PATTERN = /^[a-z0-9_]+$/u;
+
+// Forbid content-bearing keys in shareable aggregates. Configuration labels
+// such as host_settings.reasoning (effort enum) are allowed.
+const FORBIDDEN_AGGREGATE_KEYS = Object.freeze([
+  'prompt', 'prompts', 'message', 'messages', 'reasoning_text',
+  'reasoning_content', 'output_text', 'output_snippet', 'ciphertext',
+  'encrypted_content', 'credential', 'credentials', 'api_key', 'authorization',
+  'absolute_path', 'source_path',
+]);
+
+function fail(code, message) {
+  const error = new Error(message);
+  error.code = code;
+  throw error;
+}
+
+function isPlainObject(value) {
+  return value !== null && typeof value === 'object' && !Array.isArray(value);
+}
+
+function assertPlain(value, pathLabel) {
+  if (!isPlainObject(value)) fail('invalid_type', `${pathLabel} must be a JSON object.`);
+  return value;
+}
+
+function ownString(object, key, pathLabel, pattern = null) {
+  const value = object[key];
+  if (typeof value !== 'string' || value.length === 0) {
+    fail('invalid_format', `${pathLabel}.${key} must be a non-empty string.`);
+  }
+  if (pattern && !pattern.test(value)) {
+    fail('invalid_format', `${pathLabel}.${key} is not an allowed identifier.`);
+  }
+  return value;
+}
+
+function ownBoolean(object, key, pathLabel) {
+  const value = object[key];
+  if (value !== true && value !== false) fail('invalid_type', `${pathLabel}.${key} must be a boolean.`);
+  return value;
+}
+
+function ownInteger(object, key, pathLabel, min, max) {
+  const value = object[key];
+  if (!Number.isSafeInteger(value) || value < min || value > max) {
+    fail('out_of_range', `${pathLabel}.${key} must be a safe integer in ${min}..${max}.`);
+  }
+  return value;
+}
+
+function parseIso(value, pathLabel) {
+  if (typeof value !== 'string' || value.length === 0) {
+    fail('invalid_format', `${pathLabel} must be an ISO-8601 timestamp.`);
+  }
+  const ms = Date.parse(value);
+  if (!Number.isFinite(ms)) fail('invalid_format', `${pathLabel} must be an ISO-8601 timestamp.`);
+  return { raw: value, ms };
+}
+
+function hostMetric(value) {
+  if (value == null) return { value: null, source: 'unknown', trust: 'unknown' };
+  if (!Number.isSafeInteger(value) || value < 0) {
+    fail('out_of_range', 'usage metric must be a non-negative safe integer.');
+  }
+  return { value, source: 'host_measured', trust: 'host_authoritative' };
+}
+
+function unknownMetric() {
+  return { value: null, source: 'unknown', trust: 'unknown' };
+}
+
+function emptyCounters() {
+  const out = {
+    input_tokens: 0,
+    cached_input_tokens: 0,
+    output_tokens: 0,
+    reasoning_output_tokens: 0,
+    total_tokens: 0,
+  };
+  for (const key of OPTIONAL_COUNTERS) out[key] = 0;
+  return out;
+}
+
+function parseCounters(value, pathLabel) {
+  const record = assertPlain(value, pathLabel);
+  const out = emptyCounters();
+  for (const key of REQUIRED_COUNTERS) {
+    if (!Object.hasOwn(record, key)) {
+      fail('missing_key', `${pathLabel}.${key} is required.`);
+    }
+    out[key] = ownInteger(record, key, pathLabel, 0, Number.MAX_SAFE_INTEGER);
+  }
+  for (const key of OPTIONAL_COUNTERS) {
+    if (Object.hasOwn(record, key)) {
+      out[key] = ownInteger(record, key, pathLabel, 0, Number.MAX_SAFE_INTEGER);
+    }
+  }
+  for (const key of Object.keys(record)) {
+    if (!USAGE_COUNTERS.includes(key)) fail('unknown_key', `${pathLabel}.${key}`);
+  }
+  // Reasoning is a subset of output; never treat it as an additive summand.
+  // Cache counters stay separate from reasoning/output.
+  if (out.reasoning_output_tokens > out.output_tokens) {
+    fail('identity_mismatch', `${pathLabel} reasoning_output_tokens exceeds output_tokens.`);
+  }
+  return out;
+}
+
+function countersEqual(left, right) {
+  return USAGE_COUNTERS.every((key) => left[key] === right[key]);
+}
+
+function addCounters(target, source) {
+  for (const key of USAGE_COUNTERS) target[key] += source[key];
+  return target;
+}
+
+function cloneCounters(source) {
+  return addCounters(emptyCounters(), source);
+}
+
+function sha256Hex(parts) {
+  const hash = createHash('sha256');
+  hash.update(EVIDENCE_DIGEST_DOMAIN);
+  hash.update('\0');
+  for (const part of parts) {
+    const buffer = Buffer.isBuffer(part) ? part : Buffer.from(String(part), 'utf8');
+    hash.update(Buffer.from([0]));
+    hash.update(buffer);
+  }
+  return hash.digest('hex');
+}
+
+function assertSafeRelativeSessionPath(rel, pathLabel) {
+  if (typeof rel !== 'string' || rel.length === 0 || rel.length > 240) {
+    fail('invalid_format', `${pathLabel} is not a safe relative session path.`);
+  }
+  if (path.isAbsolute(rel) || rel.includes('\\') || rel.includes('\0')) {
+    fail('invalid_format', `${pathLabel} must be a relative path without absolute or drive forms.`);
+  }
+  const parts = rel.split('/');
+  if (parts.length > 12) fail('bounds_exceeded', `${pathLabel} has too many segments.`);
+  for (const part of parts) {
+    if (part === '.' || part === '..' || part.length === 0) {
+      fail('invalid_format', `${pathLabel} is not a safe relative session path.`);
+    }
+  }
+  return rel;
+}
+
+function assertBoundedShareableObject(value, pathLabel, allowedKeys) {
+  const record = assertPlain(value, pathLabel);
+  for (const key of Object.keys(record)) {
+    if (!allowedKeys.includes(key)) fail('unknown_key', `${pathLabel}.${key}`);
+    const child = record[key];
+    if (child === null) continue;
+    if (typeof child === 'boolean') continue;
+    if (typeof child === 'number' && Number.isSafeInteger(child)) continue;
+    if (typeof child === 'string') {
+      if (!SETTINGS_TOKEN.test(child) || child.includes('/') || child.includes('\\')) {
+        fail('privacy_leak', `${pathLabel}.${key} must be a bounded shareable token.`);
+      }
+      continue;
+    }
+    fail('invalid_type', `${pathLabel}.${key} must be a bounded shareable value.`);
+  }
+  return record;
+}
+
+function assertProviderConfiguration(value, pathLabel) {
+  const record = assertPlain(value, pathLabel);
+  for (const key of Object.keys(record)) {
+    if (!PROVIDER_CONFIGURATION_KEYS.includes(key)) fail('unknown_key', `${pathLabel}.${key}`);
+    const child = record[key];
+    if (child === null) continue;
+    if (typeof child === 'string') {
+      if (!SETTINGS_TOKEN.test(child) || child.includes('/') || child.includes('\\')) {
+        fail('privacy_leak', `${pathLabel}.${key} must be a bounded shareable token.`);
+      }
+      continue;
+    }
+    if (isPlainObject(child)) {
+      assertBoundedShareableObject(child, `${pathLabel}.${key}`, PROVIDER_ROLE_KEYS);
+      continue;
+    }
+    fail(
+      'invalid_type',
+      `${pathLabel}.${key} must be a bounded token or {provider,model} object.`,
+    );
+  }
+  return record;
+}
+
+function assertAgentPath(value, pathLabel) {
+  if (typeof value !== 'string' || value.length === 0 || value.length > 240) {
+    fail('invalid_format', `${pathLabel} is not a canonical agent path.`);
+  }
+  if (value === '/morpheus') return value;
+  if (!value.startsWith('/root') || value.endsWith('/')) {
+    fail('invalid_format', `${pathLabel} must be /root[/name...] or /morpheus.`);
+  }
+  const segments = value.slice(1).split('/');
+  if (segments[0] !== 'root') {
+    fail('invalid_format', `${pathLabel} must start with /root.`);
+  }
+  for (let index = 1; index < segments.length; index += 1) {
+    const segment = segments[index];
+    if (segment === 'root' || !AGENT_NAME_PATTERN.test(segment)) {
+      fail('invalid_format', `${pathLabel} has an invalid agent path segment.`);
+    }
+  }
+  return value;
+}
+
+function normalizeEffort(value) {
+  if (value === null || value === 'default') return 'default';
+  return value;
+}
+
+function extractStartedChildLink(payload, pathLabel) {
+  const record = assertPlain(payload, pathLabel);
+  const innerType = ownString(record, 'type', pathLabel);
+  let agentThreadId = null;
+  let agentPath = null;
+  if (innerType === 'sub_agent_activity') {
+    if (ownString(record, 'kind', pathLabel) !== 'started') return null;
+    agentThreadId = ownString(record, 'agent_thread_id', pathLabel);
+    agentPath = assertAgentPath(ownString(record, 'agent_path', pathLabel), `${pathLabel}.agent_path`);
+  } else if (innerType === 'item_completed') {
+    const item = assertPlain(record.item, `${pathLabel}.item`);
+    if (item.type !== 'SubAgentActivity') return null;
+    if (ownString(item, 'kind', `${pathLabel}.item`) !== 'started') return null;
+    agentThreadId = ownString(item, 'agent_thread_id', `${pathLabel}.item`);
+    agentPath = assertAgentPath(
+      ownString(item, 'agent_path', `${pathLabel}.item`),
+      `${pathLabel}.item.agent_path`,
+    );
+  } else {
+    return null;
+  }
+  return { agent_thread_id: agentThreadId, agent_path: agentPath };
+}
+
+function assertNoPrivacyLeak(value, pathLabel = 'report') {
+  if (Array.isArray(value)) {
+    value.forEach((entry, index) => assertNoPrivacyLeak(entry, `${pathLabel}[${index}]`));
+    return;
+  }
+  if (!isPlainObject(value)) {
+    if (typeof value === 'string') {
+      if (value.startsWith('/') || /^[A-Za-z]:[\\/]/u.test(value)) {
+        fail('privacy_leak', `${pathLabel} must not embed absolute source paths.`);
+      }
+    }
+    return;
+  }
+  for (const [key, child] of Object.entries(value)) {
+    const lower = key.toLowerCase();
+    if (FORBIDDEN_AGGREGATE_KEYS.includes(lower)) {
+      fail('privacy_leak', `${pathLabel}.${key} is not allowed in shareable aggregates.`);
+    }
+    if (lower.endsWith('_path') && lower !== 'agent_path_digest' && typeof child === 'string') {
+      if (path.isAbsolute(child) || child.includes('\\') || child.startsWith('/')) {
+        fail('privacy_leak', `${pathLabel}.${key} must not embed absolute source paths.`);
+      }
+    }
+    assertNoPrivacyLeak(child, `${pathLabel}.${key}`);
+  }
+}
+
+function assertAcyclicParentGraph(sessions, sessionById, pathLabel) {
+  for (const session of sessions) {
+    const seen = new Set();
+    let current = session;
+    while (current.parent_id != null) {
+      if (seen.has(current.id)) {
+        fail('identity_mismatch', `${pathLabel} session parent graph contains a cycle.`);
+      }
+      seen.add(current.id);
+      current = sessionById.get(current.parent_id);
+      if (!current) break;
+    }
+  }
+}
+
+function extractParentThreadId(payload, pathLabel) {
+  if (!Object.hasOwn(payload, 'source') || payload.source == null) return null;
+  // Normal parent CLI sessions emit source as a string (e.g. "cli"); that is not
+  // a parent link and must not be treated as a subagent object.
+  if (typeof payload.source === 'string') return null;
+  const source = assertPlain(payload.source, `${pathLabel}.source`);
+  if (!Object.hasOwn(source, 'subagent') || source.subagent == null) return null;
+  const subagent = assertPlain(source.subagent, `${pathLabel}.source.subagent`);
+  if (!Object.hasOwn(subagent, 'thread_spawn') || subagent.thread_spawn == null) return null;
+  const spawn = assertPlain(subagent.thread_spawn, `${pathLabel}.source.subagent.thread_spawn`);
+  if (!Object.hasOwn(spawn, 'parent_thread_id') || spawn.parent_thread_id == null) return null;
+  return ownString(spawn, 'parent_thread_id', `${pathLabel}.source.subagent.thread_spawn`);
+}
+
+function readSessionMetaBinding(events, sessionId) {
+  let sessionMetaId = null;
+  let parentThreadId = null;
+  for (const event of events) {
+    if (event.type !== 'session_meta') continue;
+    const payload = assertPlain(event.payload, `event:${event.lineNumber}.payload`);
+    const metaId = ownString(payload, 'id', `event:${event.lineNumber}.payload`);
+    if (sessionMetaId != null && sessionMetaId !== metaId) {
+      fail('identity_mismatch', `session ${sessionId} has conflicting session_meta ids.`);
+    }
+    sessionMetaId = metaId;
+    if (Object.hasOwn(payload, 'thread_id') && payload.thread_id != null) {
+      const threadId = ownString(payload, 'thread_id', `event:${event.lineNumber}.payload`);
+      if (threadId !== metaId && threadId !== sessionId) {
+        fail(
+          'identity_mismatch',
+          `session ${sessionId} session_meta thread_id conflicts with manifest binding.`,
+        );
+      }
+    }
+    const nextParent = extractParentThreadId(payload, `event:${event.lineNumber}.payload`);
+    if (nextParent != null) {
+      if (parentThreadId != null && parentThreadId !== nextParent) {
+        fail(
+          'identity_mismatch',
+          `session ${sessionId} has conflicting session_meta parent_thread_id values.`,
+        );
+      }
+      parentThreadId = nextParent;
+    }
+  }
+  return { sessionMetaId, parentThreadId };
+}
+
+function collectProvenAncestorSessionIds(session, sessionsById, bindingsById) {
+  // Parent/cycle/allowlist conflicts are validated in the binding prepass.
+  // Walk only proven linkages already stored on bindingsById.
+  const ancestors = new Set();
+  let current = session;
+  const seen = new Set();
+  while (current.parent_id != null) {
+    if (seen.has(current.id)) {
+      fail('identity_mismatch', `session parent graph contains a cycle at ${current.id}.`);
+    }
+    seen.add(current.id);
+    const binding = bindingsById.get(current.id);
+    if (binding == null || binding.parentThreadId == null) break;
+    if (!sessionsById.has(current.parent_id)) {
+      fail(
+        'identity_mismatch',
+        `session ${current.id} parent ancestor ${current.parent_id} is not allowlisted.`,
+      );
+    }
+    ancestors.add(current.parent_id);
+    current = sessionsById.get(current.parent_id);
+  }
+  return ancestors;
+}
+
+function assertTokenUsageIdentity(record, sessionId, sessionMetaId, allowedSharedSessionIds) {
+  const ownIds = new Set([sessionId]);
+  if (sessionMetaId != null) ownIds.add(sessionMetaId);
+
+  if (record.thread_id != null) {
+    // Child usage must keep its own thread_id; a parent/ancestor thread_id is rejected.
+    if (!ownIds.has(record.thread_id) || allowedSharedSessionIds.has(record.thread_id)) {
+      fail(
+        'identity_mismatch',
+        `session ${sessionId} token_usage_record.thread_id conflicts with session binding.`,
+      );
+    }
+  }
+  if (record.session_id != null) {
+    // Own id always ok. Shared root/ancestor session_id only when ancestry is proven.
+    if (!ownIds.has(record.session_id) && !allowedSharedSessionIds.has(record.session_id)) {
+      fail(
+        'identity_mismatch',
+        `session ${sessionId} token_usage_record.session_id conflicts with session binding.`,
+      );
+    }
+  }
+}
+
+export function parseManifest(value, pathLabel = 'manifest') {
+  const manifest = assertPlain(value, pathLabel);
+  if (manifest.schema !== MANIFEST_SCHEMA_ID) {
+    fail('invalid_format', `${pathLabel}.schema`);
+  }
+  const trial = assertPlain(manifest.trial, `${pathLabel}.trial`);
+  const window = assertPlain(manifest.window, `${pathLabel}.window`);
+  const start = parseIso(window.start, `${pathLabel}.window.start`);
+  const end = parseIso(window.end, `${pathLabel}.window.end`);
+  if (end.ms < start.ms) fail('invalid_format', `${pathLabel}.window end precedes start.`);
+
+  const sessionsInput = manifest.sessions;
+  if (!Array.isArray(sessionsInput) || sessionsInput.length < 1 || sessionsInput.length > MAX_SESSIONS) {
+    fail('bounds_exceeded', `${pathLabel}.sessions`);
+  }
+  const sessions = [];
+  const sessionById = new Map();
+  const pathsSeen = new Set();
+  for (let index = 0; index < sessionsInput.length; index += 1) {
+    const entry = assertPlain(sessionsInput[index], `${pathLabel}.sessions[${index}]`);
+    const id = ownString(entry, 'id', `${pathLabel}.sessions[${index}]`, SESSION_ID_PATTERN);
+    if (sessionById.has(id)) fail('duplicate_id', `${pathLabel}.sessions duplicate id ${id}`);
+    const role = ownString(entry, 'role', `${pathLabel}.sessions[${index}]`);
+    if (role !== 'parent' && role !== 'native_helper') {
+      fail('invalid_format', `${pathLabel}.sessions[${index}].role`);
+    }
+    const relativePath = assertSafeRelativeSessionPath(
+      ownString(entry, 'path', `${pathLabel}.sessions[${index}]`),
+      `${pathLabel}.sessions[${index}].path`,
+    );
+    if (pathsSeen.has(relativePath)) {
+      fail('duplicate_id', `${pathLabel}.sessions duplicate path ${relativePath}`);
+    }
+    pathsSeen.add(relativePath);
+    let parentId = null;
+    if (Object.hasOwn(entry, 'parent_id') && entry.parent_id != null) {
+      parentId = ownString(entry, 'parent_id', `${pathLabel}.sessions[${index}]`, SESSION_ID_PATTERN);
+    }
+    if (role === 'native_helper' && parentId == null) {
+      fail('invalid_format', `${pathLabel}.sessions[${index}] native_helper requires parent_id.`);
+    }
+    if (role === 'parent' && parentId != null) {
+      fail('invalid_format', `${pathLabel}.sessions[${index}] parent cannot declare parent_id.`);
+    }
+    const record = { id, role, path: relativePath, parent_id: parentId, agent_path: null, expected_model: null };
+    if (Object.hasOwn(entry, 'agent_path') && entry.agent_path != null) {
+      record.agent_path = assertAgentPath(
+        ownString(entry, 'agent_path', `${pathLabel}.sessions[${index}]`),
+        `${pathLabel}.sessions[${index}].agent_path`,
+      );
+    }
+    if (Object.hasOwn(entry, 'expected_model') && entry.expected_model != null) {
+      record.expected_model = ownString(
+        entry,
+        'expected_model',
+        `${pathLabel}.sessions[${index}]`,
+        SETTINGS_TOKEN,
+      );
+    }
+    if (role === 'parent' && record.expected_model != null) {
+      fail('invalid_format', `${pathLabel}.sessions[${index}] parent uses trial.host_model.`);
+    }
+    sessions.push(record);
+    sessionById.set(id, record);
+  }
+  for (const session of sessions) {
+    if (session.parent_id != null && !sessionById.has(session.parent_id)) {
+      fail('identity_mismatch', `${pathLabel} session ${session.id} parent_id is not allowlisted.`);
+    }
+  }
+  assertAcyclicParentGraph(sessions, sessionById, pathLabel);
+
+  const phasesInput = manifest.phases;
+  if (!Array.isArray(phasesInput) || phasesInput.length < 1 || phasesInput.length > MAX_PHASES) {
+    fail('bounds_exceeded', `${pathLabel}.phases`);
+  }
+  const phases = [];
+  const attemptIds = new Set();
+  for (let index = 0; index < phasesInput.length; index += 1) {
+    const entry = assertPlain(phasesInput[index], `${pathLabel}.phases[${index}]`);
+    const attemptId = ownString(entry, 'attempt_id', `${pathLabel}.phases[${index}]`, ID_PATTERN);
+    if (attemptIds.has(attemptId)) {
+      fail('duplicate_id', `${pathLabel}.phases duplicate attempt_id ${attemptId}`);
+    }
+    attemptIds.add(attemptId);
+    const kind = ownString(entry, 'kind', `${pathLabel}.phases[${index}]`);
+    if (!ATTEMPT_KINDS.includes(kind)) fail('invalid_format', `${pathLabel}.phases[${index}].kind`);
+    const outcome = ownString(entry, 'outcome', `${pathLabel}.phases[${index}]`);
+    if (!ATTEMPT_OUTCOMES.includes(outcome)) {
+      fail('invalid_format', `${pathLabel}.phases[${index}].outcome`);
+    }
+    const sequence = Object.hasOwn(entry, 'sequence')
+      ? ownInteger(entry, 'sequence', `${pathLabel}.phases[${index}]`, 1, MAX_PHASES)
+      : index + 1;
+    const phaseStart = parseIso(entry.start, `${pathLabel}.phases[${index}].start`);
+    const phaseEnd = parseIso(entry.end, `${pathLabel}.phases[${index}].end`);
+    if (phaseEnd.ms < phaseStart.ms) {
+      fail('invalid_format', `${pathLabel}.phases[${index}] end precedes start.`);
+    }
+    if (phaseStart.ms < start.ms || phaseEnd.ms > end.ms) {
+      fail('identity_mismatch', `${pathLabel}.phases[${index}] escapes the trial window.`);
+    }
+    const sessionId = ownString(entry, 'session_id', `${pathLabel}.phases[${index}]`, SESSION_ID_PATTERN);
+    if (!sessionById.has(sessionId)) {
+      fail('identity_mismatch', `${pathLabel}.phases[${index}].session_id is not allowlisted.`);
+    }
+    const session = sessionById.get(sessionId);
+    if (kind === 'native_helper' && session.role !== 'native_helper') {
+      fail('identity_mismatch', `${pathLabel}.phases[${index}] helper phase requires helper session.`);
+    }
+    if (kind !== 'native_helper' && session.role !== 'parent') {
+      fail('identity_mismatch', `${pathLabel}.phases[${index}] non-helper phase requires parent session.`);
+    }
+    let provider = null;
+    let model = null;
+    if (Object.hasOwn(entry, 'provider') || Object.hasOwn(entry, 'model')) {
+      provider = ownString(entry, 'provider', `${pathLabel}.phases[${index}]`);
+      model = ownString(entry, 'model', `${pathLabel}.phases[${index}]`);
+    }
+    phases.push({
+      attempt_id: attemptId,
+      kind,
+      outcome,
+      sequence,
+      start: phaseStart,
+      end: phaseEnd,
+      session_id: sessionId,
+      provider,
+      model,
+    });
+  }
+
+  for (let i = 0; i < phases.length; i += 1) {
+    for (let j = i + 1; j < phases.length; j += 1) {
+      const left = phases[i];
+      const right = phases[j];
+      if (left.session_id !== right.session_id) continue;
+      // Adjacent boundaries may touch; interior overlap is rejected.
+      const overlap = left.start.ms < right.end.ms && right.start.ms < left.end.ms;
+      if (overlap) {
+        fail(
+          'identity_mismatch',
+          `${pathLabel}.phases ${left.attempt_id} and ${right.attempt_id} overlap on one session.`,
+        );
+      }
+    }
+  }
+
+  let accepted = undefined;
+  let acceptanceKnown = false;
+  if (Object.hasOwn(trial, 'accepted') && trial.accepted !== null) {
+    accepted = ownBoolean(trial, 'accepted', `${pathLabel}.trial`);
+    acceptanceKnown = true;
+  }
+
+  return {
+    schema: MANIFEST_SCHEMA_ID,
+    trial: {
+      trial_id: ownString(trial, 'trial_id', `${pathLabel}.trial`, ID_PATTERN),
+      case_id: ownString(trial, 'case_id', `${pathLabel}.trial`, ID_PATTERN),
+      arm: ownString(trial, 'arm', `${pathLabel}.trial`),
+      base_sha: ownString(trial, 'base_sha', `${pathLabel}.trial`, SHA40),
+      input_digest: ownString(trial, 'input_digest', `${pathLabel}.trial`, SHA256),
+      coengineer_source: assertPlain(trial.coengineer_source, `${pathLabel}.trial.coengineer_source`),
+      host_model: ownString(trial, 'host_model', `${pathLabel}.trial`),
+      host_settings: assertBoundedShareableObject(
+        trial.host_settings,
+        `${pathLabel}.trial.host_settings`,
+        HOST_SETTINGS_KEYS,
+      ),
+      provider_configuration: assertProviderConfiguration(
+        trial.provider_configuration,
+        `${pathLabel}.trial.provider_configuration`,
+      ),
+      accepted,
+      acceptanceKnown,
+    },
+    window: { start, end },
+    sessions,
+    phases,
+  };
+}
+
+function parseEventLine(line, pathLabel, lineNumber) {
+  let parsed;
+  try {
+    parsed = JSON.parse(line);
+  } catch {
+    fail('invalid_format', `${pathLabel}:${lineNumber} is not JSON.`);
+  }
+  const event = assertPlain(parsed, `${pathLabel}:${lineNumber}`);
+  const timestamp = parseIso(ownString(event, 'timestamp', `${pathLabel}:${lineNumber}`), `${pathLabel}:${lineNumber}.timestamp`);
+  const type = ownString(event, 'type', `${pathLabel}:${lineNumber}`);
+  const payload = Object.hasOwn(event, 'payload') ? event.payload : {};
+  return { timestamp, type, payload, lineNumber };
+}
+
+function collectResponseRecord(payload, pathLabel) {
+  const record = assertPlain(payload, pathLabel);
+  const responseId = ownString(record, 'response_id', pathLabel);
+  const usage = parseCounters(record.usage, `${pathLabel}.usage`);
+  const thread = parseCounters(record.thread_token_usage, `${pathLabel}.thread_token_usage`);
+  let threadId = null;
+  let sessionIdField = null;
+  if (Object.hasOwn(record, 'thread_id') && record.thread_id != null) {
+    threadId = ownString(record, 'thread_id', pathLabel);
+  }
+  if (Object.hasOwn(record, 'session_id') && record.session_id != null) {
+    sessionIdField = ownString(record, 'session_id', pathLabel);
+  }
+  return {
+    response_id: responseId,
+    usage,
+    thread_token_usage: thread,
+    thread_id: threadId,
+    session_id: sessionIdField,
+  };
+}
+
+function responseKey(sessionId, responseId) {
+  return `${sessionId}\0${responseId}`;
+}
+
+function phaseOwnsTimestamp(phase, timestampMs, phasesOnSession) {
+  if (timestampMs < phase.start.ms || timestampMs > phase.end.ms) return false;
+  if (timestampMs === phase.end.ms) {
+    // Endpoints are closed only when no adjacent same-session phase starts here.
+    const claimedByNext = phasesOnSession.some(
+      (other) => other.attempt_id !== phase.attempt_id && other.start.ms === phase.end.ms,
+    );
+    return !claimedByNext;
+  }
+  return true;
+}
+
+async function resolvePathInsideRoot(sessionsRoot, relativePath, pathLabel) {
+  let rootReal;
+  try {
+    rootReal = await realpath(sessionsRoot);
+  } catch {
+    fail('invalid_format', `${pathLabel} sessions root is not resolvable.`);
+  }
+  const absolute = path.resolve(sessionsRoot, relativePath);
+  let candidateReal;
+  try {
+    candidateReal = await realpath(absolute);
+  } catch {
+    // Absent files: resolve the deepest existing ancestor and reject escapes.
+    let cursor = path.dirname(absolute);
+    let resolvedParent = null;
+    while (true) {
+      try {
+        resolvedParent = await realpath(cursor);
+        break;
+      } catch {
+        const parent = path.dirname(cursor);
+        if (parent === cursor) break;
+        cursor = parent;
+      }
+    }
+    if (resolvedParent == null) {
+      fail('invalid_format', `${pathLabel} resolves outside sessions root.`);
+    }
+    if (resolvedParent !== rootReal && !resolvedParent.startsWith(rootReal + path.sep)) {
+      fail('invalid_format', `${pathLabel} resolves outside sessions root.`);
+    }
+    return { absolute, real: null, rootReal, present: false };
+  }
+  if (candidateReal !== rootReal && !candidateReal.startsWith(rootReal + path.sep)) {
+    fail('invalid_format', `${pathLabel} resolves outside sessions root.`);
+  }
+  const info = await lstat(absolute);
+  if (info.isSymbolicLink()) {
+    // Symlink targets were validated via realpath; keep the real path for reads.
+  }
+  return { absolute, real: candidateReal, rootReal, present: true };
+}
+
+async function readAllowlistedSession(resolved, relativePath, pathLabel) {
+  if (!resolved.present) {
+    return { status: 'absent', relativePath, bytes: null, digest: null, events: [], text: null, realPath: null };
+  }
+  let info;
+  try {
+    info = await stat(resolved.real);
+  } catch {
+    return { status: 'absent', relativePath, bytes: null, digest: null, events: [], text: null, realPath: null };
+  }
+  if (!info.isFile()) fail('invalid_type', `${pathLabel} is not a file.`);
+  if (info.size > MAX_SESSION_BYTES) fail('bounds_exceeded', `${pathLabel} exceeds ${MAX_SESSION_BYTES} bytes.`);
+  const text = await readFile(resolved.real, 'utf8');
+  if (Buffer.byteLength(text, 'utf8') > MAX_SESSION_BYTES) {
+    fail('bounds_exceeded', `${pathLabel} exceeds ${MAX_SESSION_BYTES} bytes.`);
+  }
+  const digest = sha256Hex(['session-bytes', relativePath, text]);
+  const lines = text.split(/\r?\n/u).filter((line) => line.length > 0);
+  if (lines.length > MAX_LINES) fail('bounds_exceeded', `${pathLabel} has too many events.`);
+  const events = lines.map((line, index) => parseEventLine(line, pathLabel, index + 1));
+  return {
+    status: 'present',
+    relativePath,
+    bytes: Buffer.byteLength(text, 'utf8'),
+    digest,
+    events,
+    text,
+    realPath: resolved.real,
+  };
+}
+
+function analyzeSessionEvents(events, window, sessionId, options = {}) {
+  const expectedHostModel = options.expectedModel ?? null;
+  const expectedHostSettings = options.expectedSettings ?? null;
+  const allowedSharedSessionIds = options.allowedSharedSessionIds ?? new Set();
+  // Identity/parent binding is validated once in the prepass; reuse it here.
+  const sessionMetaId = options.sessionMetaId ?? null;
+  let model = null;
+  let effort = undefined;
+  let sawCollabEffort = false;
+  let sandbox = null;
+  const responses = new Map();
+  const childLinks = [];
+  const compactedAt = [];
+  let secondaryTotal = null;
+  let lastThread = null;
+  let preWindowThread = emptyCounters();
+  let sawPreWindowUsage = false;
+  let primaryComplete = true;
+  const notes = [];
+  let attributionUnknown = false;
+
+  for (const event of events) {
+    const inWindow = event.timestamp.ms >= window.start.ms && event.timestamp.ms <= window.end.ms;
+
+    if (event.type === 'session_meta') {
+      continue;
+    }
+
+    if (event.type === 'turn_context') {
+      const payload = assertPlain(event.payload, `event:${event.lineNumber}.payload`);
+      const pathLabel = `event:${event.lineNumber}.payload`;
+      if (Object.hasOwn(payload, 'model')) {
+        const nextModel = ownString(payload, 'model', pathLabel);
+        if (model != null && model !== nextModel) {
+          fail('identity_mismatch', `session ${sessionId} observes conflicting models.`);
+        }
+        model = nextModel;
+      }
+      if (Object.hasOwn(payload, 'sandbox_policy') && payload.sandbox_policy != null) {
+        const policy = assertPlain(payload.sandbox_policy, `${pathLabel}.sandbox_policy`);
+        const nextSandbox = ownString(policy, 'type', `${pathLabel}.sandbox_policy`);
+        if (sandbox != null && sandbox !== nextSandbox) {
+          fail('identity_mismatch', `session ${sessionId} observes conflicting sandbox_policy.`);
+        }
+        sandbox = nextSandbox;
+      }
+      let eventCollabEffort = false;
+      if (Object.hasOwn(payload, 'collaboration_mode') && payload.collaboration_mode != null) {
+        const collab = assertPlain(payload.collaboration_mode, `${pathLabel}.collaboration_mode`);
+        if (Object.hasOwn(collab, 'settings') && collab.settings != null) {
+          const settings = assertPlain(collab.settings, `${pathLabel}.collaboration_mode.settings`);
+          if (Object.hasOwn(settings, 'model') && settings.model != null) {
+            const collabModel = ownString(settings, 'model', `${pathLabel}.collaboration_mode.settings`);
+            if (model != null && model !== collabModel) {
+              fail(
+                'identity_mismatch',
+                `session ${sessionId} collaboration_mode model conflicts with turn_context model.`,
+              );
+            }
+            model = collabModel;
+          }
+          if (Object.hasOwn(settings, 'reasoning_effort')) {
+            const value = settings.reasoning_effort;
+            if (typeof value !== 'string' && typeof value !== 'number' && value !== null) {
+              fail('invalid_type', `${pathLabel}.collaboration_mode.settings.reasoning_effort`);
+            }
+            if (effort !== undefined && normalizeEffort(effort) !== normalizeEffort(value)) {
+              fail('identity_mismatch', `session ${sessionId} observes conflicting reasoning effort.`);
+            }
+            effort = value;
+            sawCollabEffort = true;
+            eventCollabEffort = true;
+          }
+        }
+      }
+      // Legacy top-level effort: only when collaboration_mode did not emit reasoning_effort.
+      if (!eventCollabEffort && Object.hasOwn(payload, 'effort')) {
+        const value = payload.effort;
+        if (typeof value !== 'string' && typeof value !== 'number' && value !== null) {
+          fail('invalid_type', `${pathLabel}.effort`);
+        }
+        if (sawCollabEffort && normalizeEffort(effort) !== normalizeEffort(value)) {
+          fail('identity_mismatch', `session ${sessionId} legacy effort conflicts with collaboration_mode.`);
+        }
+        if (effort !== undefined && normalizeEffort(effort) !== normalizeEffort(value)) {
+          fail('identity_mismatch', `session ${sessionId} observes conflicting reasoning effort.`);
+        }
+        effort = value;
+      }
+      if (expectedHostModel != null && model != null && model !== expectedHostModel) {
+        fail(
+          'identity_mismatch',
+          `session ${sessionId} model ${model} conflicts with expected model ${expectedHostModel}.`,
+        );
+      }
+      continue;
+    }
+
+    if (event.type === 'token_usage_record') {
+      const record = collectResponseRecord(event.payload, `event:${event.lineNumber}.payload`);
+      assertTokenUsageIdentity(record, sessionId, sessionMetaId, allowedSharedSessionIds);
+      if (!inWindow) {
+        if (event.timestamp.ms < window.start.ms) {
+          preWindowThread = cloneCounters(record.thread_token_usage);
+          sawPreWindowUsage = true;
+          lastThread = record.thread_token_usage;
+        }
+        continue;
+      }
+      const previous = responses.get(record.response_id);
+      if (previous) {
+        if (!countersEqual(previous.usage, record.usage)
+          || !countersEqual(previous.thread_token_usage, record.thread_token_usage)) {
+          fail(
+            'identity_mismatch',
+            `conflicting duplicate response_id ${record.response_id}`,
+          );
+        }
+        previous.duplicate_count += 1;
+      } else {
+        responses.set(record.response_id, {
+          ...record,
+          timestamp: event.timestamp,
+          model,
+          effort: effort === undefined ? null : effort,
+          sandbox,
+          duplicate_count: 1,
+        });
+      }
+      lastThread = record.thread_token_usage;
+      continue;
+    }
+
+    if (event.type === 'compacted') {
+      if (inWindow) compactedAt.push(event.timestamp.ms);
+      continue;
+    }
+
+    if (event.type === 'event_msg') {
+      const payload = assertPlain(event.payload, `event:${event.lineNumber}.payload`);
+      const started = extractStartedChildLink(payload, `event:${event.lineNumber}.payload`);
+      if (started) {
+        // Parent graph links are collected outside the usage window too.
+        childLinks.push({
+          ...started,
+          timestamp: event.timestamp,
+        });
+        continue;
+      }
+      if (!inWindow) continue;
+      const innerType = ownString(payload, 'type', `event:${event.lineNumber}.payload`);
+      if (innerType === 'token_count') {
+        const info = payload.info == null ? null : assertPlain(payload.info, `event:${event.lineNumber}.payload.info`);
+        if (info && Object.hasOwn(info, 'total_token_usage')) {
+          secondaryTotal = parseCounters(
+            info.total_token_usage,
+            `event:${event.lineNumber}.payload.info.total_token_usage`,
+          );
+        }
+      }
+    }
+  }
+
+  if (sessionMetaId == null) {
+    attributionUnknown = true;
+    notes.push('missing_session_meta');
+  } else if (sessionMetaId !== sessionId) {
+    fail(
+      'identity_mismatch',
+      `session ${sessionId} session_meta id ${sessionMetaId} conflicts with manifest id.`,
+    );
+  }
+
+  if (expectedHostModel != null && model != null && model !== expectedHostModel) {
+    fail(
+      'identity_mismatch',
+      `session ${sessionId} model ${model} conflicts with expected model ${expectedHostModel}.`,
+    );
+  }
+
+  if (expectedHostSettings != null) {
+    if (effort !== undefined) {
+      const expectedEffort = expectedHostSettings.reasoning;
+      if (normalizeEffort(effort) !== normalizeEffort(expectedEffort)) {
+        fail(
+          'identity_mismatch',
+          `session ${sessionId} reasoning effort conflicts with host_settings.reasoning.`,
+        );
+      }
+    }
+    if (sandbox != null && expectedHostSettings.sandbox != null
+      && sandbox !== expectedHostSettings.sandbox) {
+      fail(
+        'identity_mismatch',
+        `session ${sessionId} sandbox_policy conflicts with host_settings.sandbox.`,
+      );
+    }
+  }
+
+  const summed = emptyCounters();
+  for (const record of responses.values()) addCounters(summed, record.usage);
+
+  if (responses.size === 0 && !sawPreWindowUsage) {
+    primaryComplete = false;
+    notes.push('missing_primary_token_usage_records');
+  } else if (lastThread) {
+    const expected = addCounters(cloneCounters(preWindowThread), summed);
+    if (!countersEqual(expected, lastThread)) {
+      primaryComplete = false;
+      notes.push('response_sum_thread_mismatch');
+    }
+  }
+
+  if (responses.size > 0 && model == null) {
+    primaryComplete = false;
+    notes.push('missing_observed_model');
+  }
+
+  if (secondaryTotal && lastThread) {
+    const expectedSecondary = addCounters(cloneCounters(preWindowThread), summed);
+    if (!countersEqual(secondaryTotal, expectedSecondary) && !countersEqual(secondaryTotal, lastThread)) {
+      // Secondary cumulative totals may omit compaction; keep primary authoritative.
+      notes.push('secondary_token_count_diverges');
+    }
+  }
+
+  if (attributionUnknown) primaryComplete = false;
+
+  return {
+    model,
+    effort: effort === undefined ? null : effort,
+    sandbox,
+    responses,
+    childLinks,
+    compactedAt,
+    compactedCount: compactedAt.length,
+    summed,
+    lastThread,
+    preWindowThread: sawPreWindowUsage ? preWindowThread : emptyCounters(),
+    secondaryTotal,
+    primaryComplete,
+    notes,
+    attributionUnknown,
+  };
+}
+
+function resolveLinkedChildren(seedIds, sessionsById, analyzedById, loadedById) {
+  const seen = new Set();
+  const visiting = new Set();
+  const queue = [...seedIds];
+  const ordered = [];
+  const unlisted = [];
+
+  while (queue.length > 0) {
+    const id = queue.shift();
+    if (seen.has(id)) continue;
+    if (visiting.has(id)) {
+      fail('identity_mismatch', `linked session graph contains a cycle at ${id}.`);
+    }
+    visiting.add(id);
+    seen.add(id);
+    ordered.push(id);
+    const analysis = analyzedById.get(id);
+    if (analysis) {
+      for (const link of analysis.childLinks) {
+        const matched = sessionsById.get(link.agent_thread_id);
+        if (!matched) {
+          // Unlisted started children are not basename-resolved; coverage stays inconclusive.
+          unlisted.push({ parent_id: id, agent_thread_id: link.agent_thread_id });
+          continue;
+        }
+        // agent_path is canonical agent identity (/root/helper), not a session file path.
+        if (matched.agent_path != null && matched.agent_path !== link.agent_path) {
+          fail(
+            'identity_mismatch',
+            `nested child ${link.agent_thread_id} agent_path conflicts with allowlisted identity.`,
+          );
+        }
+        if (matched.parent_id !== id) {
+          fail(
+            'identity_mismatch',
+            `nested child ${link.agent_thread_id} parent graph conflicts with link from ${id}.`,
+          );
+        }
+        const loaded = loadedById.get(matched.id);
+        if (!loaded || loaded.status !== 'present') {
+          fail(
+            'identity_mismatch',
+            `missing nested child session file for ${matched.id}.`,
+          );
+        }
+        if (!seen.has(matched.id)) queue.push(matched.id);
+      }
+    }
+    for (const session of sessionsById.values()) {
+      if (session.parent_id === id && !seen.has(session.id)) queue.push(session.id);
+    }
+    visiting.delete(id);
+  }
+  return { ordered, unlisted };
+}
+
+function assignResponsesToPhases(phases, analyzedById) {
+  const byPhase = new Map();
+  const compactionByPhase = new Map();
+  const unassigned = [];
+  for (const phase of phases) {
+    byPhase.set(phase.attempt_id, []);
+    compactionByPhase.set(phase.attempt_id, 0);
+  }
+
+  const phasesBySession = new Map();
+  for (const phase of phases) {
+    const list = phasesBySession.get(phase.session_id) ?? [];
+    list.push(phase);
+    phasesBySession.set(phase.session_id, list);
+  }
+
+  for (const [sessionId, analysis] of analyzedById.entries()) {
+    const sessionPhases = phasesBySession.get(sessionId) ?? [];
+    for (const record of analysis.responses.values()) {
+      const owning = sessionPhases.filter((phase) => (
+        phaseOwnsTimestamp(phase, record.timestamp.ms, sessionPhases)
+      ));
+      if (owning.length === 0) {
+        unassigned.push({
+          session_id: sessionId,
+          response_id: record.response_id,
+          key: responseKey(sessionId, record.response_id),
+        });
+        continue;
+      }
+      if (owning.length > 1) {
+        fail(
+          'identity_mismatch',
+          `response ${record.response_id} in session ${sessionId} maps to multiple phases.`,
+        );
+      }
+      byPhase.get(owning[0].attempt_id).push(record);
+    }
+
+    const claimedCompaction = new Set();
+    for (const stamp of analysis.compactedAt ?? []) {
+      const owning = sessionPhases.filter((phase) => phaseOwnsTimestamp(phase, stamp, sessionPhases));
+      if (owning.length === 1 && !claimedCompaction.has(stamp)) {
+        compactionByPhase.set(
+          owning[0].attempt_id,
+          (compactionByPhase.get(owning[0].attempt_id) ?? 0) + 1,
+        );
+        claimedCompaction.add(stamp);
+      }
+    }
+  }
+
+  return { byPhase, compactionByPhase, unassigned };
+}
+
+function buildAttemptUsage(phase, records, compactionEvents, sessionAnalysis, options) {
+  const inconclusive = options.inconclusive;
+  const sums = emptyCounters();
+  const models = new Map();
+  for (const record of records) {
+    addCounters(sums, record.usage);
+    const key = record.model ?? 'unknown';
+    const bucket = models.get(key) ?? emptyCounters();
+    addCounters(bucket, record.usage);
+    models.set(key, bucket);
+  }
+
+  const elapsed = phase.end.ms - phase.start.ms;
+  const helperCalls = phase.kind === 'native_helper' ? 1 : 0;
+  const correctionRounds = phase.kind === 'correction' ? 1 : 0;
+
+  // A fully observed empty phase is zero, not unknown. Incomplete primary
+  // evidence stays unknown and is never coerced to zero.
+  const measured = !inconclusive && sessionAnalysis?.primaryComplete === true;
+  const usage = {
+    native_input_tokens: measured ? hostMetric(sums.input_tokens) : unknownMetric(),
+    native_output_tokens: measured ? hostMetric(sums.output_tokens) : unknownMetric(),
+    native_helper_calls: hostMetric(helperCalls),
+    correction_rounds: hostMetric(correctionRounds),
+    elapsed_ms: hostMetric(elapsed),
+    provider_input_tokens: unknownMetric(),
+    provider_output_tokens: unknownMetric(),
+    provider_cost_millicents: unknownMetric(),
+    model_facing_bytes: unknownMetric(),
+    // Session byte sizes stay in evidence digests; per-attempt evidence_bytes
+    // would double-count shared session files across phases.
+    evidence_bytes: unknownMetric(),
+  };
+
+  return {
+    usage,
+    breakdown: {
+      input_tokens: measured ? sums.input_tokens : null,
+      cached_input_tokens: measured ? sums.cached_input_tokens : null,
+      cache_write_input_tokens: measured ? sums.cache_write_input_tokens : null,
+      output_tokens: measured ? sums.output_tokens : null,
+      reasoning_output_tokens: measured ? sums.reasoning_output_tokens : null,
+      compaction_events: measured ? compactionEvents : null,
+      by_model: [...models.entries()].map(([model, counters]) => ({
+        model,
+        ...counters,
+      })),
+    },
+  };
+}
+
+function emitTrial(parsedTrial) {
+  const emittedTrial = {
+    schema: parsedTrial.schema,
+    trial_id: parsedTrial.trial_id,
+    case_id: parsedTrial.case_id,
+    arm: parsedTrial.arm,
+    base_sha: parsedTrial.base_sha,
+    input_digest: parsedTrial.input_digest,
+    coengineer_source: {
+      kind: parsedTrial.coengineer_source.kind,
+      value: parsedTrial.coengineer_source.value,
+    },
+    host_model: parsedTrial.host_model,
+    host_settings: parsedTrial.host_settings,
+    provider_configuration: parsedTrial.provider_configuration,
+    wall_elapsed_ms: {
+      value: parsedTrial.wall_elapsed_ms.value,
+      source: parsedTrial.wall_elapsed_ms.source,
+      trust: parsedTrial.wall_elapsed_ms.trust,
+    },
+    attempts: parsedTrial.attempts.map((attempt) => {
+      const row = {
+        attempt_id: attempt.attempt_id,
+        kind: attempt.kind,
+        outcome: attempt.outcome,
+        sequence: attempt.sequence,
+        usage: Object.fromEntries(
+          Object.entries(attempt.usage).map(([key, metric]) => [key, {
+            value: metric.value,
+            source: metric.source,
+            trust: metric.trust,
+          }]),
+        ),
+      };
+      if (attempt.provider != null) {
+        row.provider = attempt.provider;
+        row.model = attempt.model;
+      }
+      return row;
+    }),
+  };
+  if (parsedTrial.accepted !== null) {
+    emittedTrial.accepted = parsedTrial.accepted;
+  }
+  if (parsedTrial.native_parent_excludes_helpers) {
+    emittedTrial.native_parent_excludes_helpers = true;
+  }
+  return emittedTrial;
+}
+
+export async function collectTrialUsage(manifestInput, options = {}) {
+  const manifest = parseManifest(manifestInput);
+  const sessionsRoot = options.sessionsRoot
+    ? path.resolve(options.sessionsRoot)
+    : process.cwd();
+
+  const sessionsById = new Map(manifest.sessions.map((session) => [session.id, session]));
+  const loadedById = new Map();
+  const analyzedById = new Map();
+  const bindingsById = new Map();
+  const evidence = {
+    session_digests: {},
+    link_digests: [],
+    notes: [],
+  };
+  let measurementIncomplete = false;
+  let coverageIncomplete = false;
+  const acceptanceUnknown = !manifest.trial.acceptanceKnown;
+  if (acceptanceUnknown) {
+    coverageIncomplete = true;
+    evidence.notes.push('acceptance_unknown');
+  }
+
+  for (const session of manifest.sessions) {
+    const resolved = await resolvePathInsideRoot(
+      sessionsRoot,
+      session.path,
+      `session:${session.id}`,
+    );
+    const loaded = await readAllowlistedSession(resolved, session.path, `session:${session.id}`);
+    loadedById.set(session.id, loaded);
+    if (loaded.status === 'absent') {
+      measurementIncomplete = true;
+      coverageIncomplete = true;
+      evidence.notes.push(`absent_session:${session.id}`);
+      bindingsById.set(session.id, { sessionMetaId: null, parentThreadId: null });
+      analyzedById.set(session.id, {
+        model: null,
+        effort: null,
+        sandbox: null,
+        responses: new Map(),
+        childLinks: [],
+        compactedAt: [],
+        compactedCount: 0,
+        summed: emptyCounters(),
+        lastThread: null,
+        preWindowThread: emptyCounters(),
+        secondaryTotal: null,
+        primaryComplete: false,
+        notes: ['absent_session'],
+        bytes: null,
+        digest: null,
+        attributionUnknown: true,
+      });
+      continue;
+    }
+    evidence.session_digests[session.id] = loaded.digest;
+    const binding = readSessionMetaBinding(loaded.events, session.id);
+    if (binding.parentThreadId != null) {
+      if (session.parent_id == null) {
+        fail(
+          'identity_mismatch',
+          `session ${session.id} session_meta parent_thread_id is not allowed for parent role.`,
+        );
+      }
+      if (binding.parentThreadId !== session.parent_id) {
+        fail(
+          'identity_mismatch',
+          `session ${session.id} session_meta parent_thread_id conflicts with manifest parent_id.`,
+        );
+      }
+    }
+    bindingsById.set(session.id, binding);
+  }
+
+  for (const session of manifest.sessions) {
+    const loaded = loadedById.get(session.id);
+    if (loaded.status === 'absent') continue;
+    const expectedModel = session.role === 'parent'
+      ? manifest.trial.host_model
+      : session.expected_model;
+    const expectedSettings = session.role === 'parent'
+      ? manifest.trial.host_settings
+      : null;
+    const binding = bindingsById.get(session.id);
+    const allowedSharedSessionIds = collectProvenAncestorSessionIds(
+      session,
+      sessionsById,
+      bindingsById,
+    );
+    const analysis = analyzeSessionEvents(
+      loaded.events,
+      manifest.window,
+      session.id,
+      {
+        expectedModel,
+        expectedSettings,
+        sessionMetaId: binding?.sessionMetaId ?? null,
+        allowedSharedSessionIds,
+      },
+    );
+    analysis.bytes = loaded.bytes;
+    analysis.digest = loaded.digest;
+    analyzedById.set(session.id, analysis);
+    if (!analysis.primaryComplete) {
+      measurementIncomplete = true;
+      coverageIncomplete = true;
+      evidence.notes.push(...analysis.notes.map((note) => `${session.id}:${note}`));
+    } else if (analysis.notes.length > 0) {
+      evidence.notes.push(...analysis.notes.map((note) => `${session.id}:${note}`));
+    }
+    for (const link of analysis.childLinks) {
+      evidence.link_digests.push(sha256Hex([
+        'child-link',
+        session.id,
+        link.agent_thread_id,
+        link.agent_path,
+      ]));
+    }
+  }
+
+  const parentIds = manifest.sessions.filter((session) => session.role === 'parent').map((s) => s.id);
+  const walk = resolveLinkedChildren(parentIds, sessionsById, analyzedById, loadedById);
+  const walkOrder = walk.ordered;
+  if (walk.unlisted.length > 0) {
+    coverageIncomplete = true;
+    for (const entry of walk.unlisted) {
+      evidence.notes.push(`unlisted_nested_child:${entry.parent_id}->${entry.agent_thread_id}`);
+    }
+  }
+  for (const session of manifest.sessions) {
+    if (!walkOrder.includes(session.id) && session.role === 'native_helper') {
+      // Explicitly allowlisted helpers are still included even without a live link event.
+      walkOrder.push(session.id);
+    }
+  }
+
+  const assignment = assignResponsesToPhases(manifest.phases, analyzedById);
+  if (assignment.unassigned.length > 0) {
+    measurementIncomplete = true;
+    coverageIncomplete = true;
+    evidence.notes.push(`unassigned_responses:${assignment.unassigned.length}`);
+  }
+
+  const hasHelpers = manifest.phases.some((phase) => phase.kind === 'native_helper');
+  const hasParent = manifest.phases.some((phase) => phase.kind !== 'native_helper');
+
+  const attempts = [];
+  const breakdownAttempts = [];
+  for (const phase of manifest.phases) {
+    const records = assignment.byPhase.get(phase.attempt_id) ?? [];
+    const analysis = analyzedById.get(phase.session_id);
+    if (phase.model != null && analysis?.model != null && phase.model !== analysis.model) {
+      fail(
+        'identity_mismatch',
+        `phase ${phase.attempt_id} model conflicts with observed session model.`,
+      );
+    }
+    const phaseIncomplete = measurementIncomplete
+      || analysis?.primaryComplete !== true
+      || (phase.kind === 'native_helper' && loadedById.get(phase.session_id)?.status === 'absent');
+    const built = buildAttemptUsage(
+      phase,
+      records,
+      assignment.compactionByPhase.get(phase.attempt_id) ?? 0,
+      analysis,
+      { inconclusive: phaseIncomplete },
+    );
+    const attempt = {
+      attempt_id: phase.attempt_id,
+      kind: phase.kind,
+      outcome: phase.outcome,
+      sequence: phase.sequence,
+      usage: built.usage,
+    };
+    if (phase.provider != null) {
+      attempt.provider = phase.provider;
+      attempt.model = phase.model;
+    }
+    attempts.push(attempt);
+    breakdownAttempts.push({
+      attempt_id: phase.attempt_id,
+      session_id: phase.session_id,
+      ...built.breakdown,
+    });
+  }
+
+  const wall = manifest.window.end.ms - manifest.window.start.ms;
+  const trial = {
+    schema: TRIAL_SCHEMA_ID,
+    trial_id: manifest.trial.trial_id,
+    case_id: manifest.trial.case_id,
+    arm: manifest.trial.arm,
+    base_sha: manifest.trial.base_sha,
+    input_digest: manifest.trial.input_digest,
+    coengineer_source: manifest.trial.coengineer_source,
+    host_model: manifest.trial.host_model,
+    host_settings: manifest.trial.host_settings,
+    provider_configuration: manifest.trial.provider_configuration,
+    wall_elapsed_ms: hostMetric(wall),
+    attempts,
+  };
+  if (manifest.trial.acceptanceKnown) {
+    trial.accepted = manifest.trial.accepted;
+  }
+  if (hasHelpers && hasParent) {
+    trial.native_parent_excludes_helpers = true;
+  }
+
+  const parsedTrial = parseTrial(trial);
+  const emittedTrial = emitTrial(parsedTrial);
+
+  const totals = {
+    input_tokens: null,
+    cached_input_tokens: null,
+    cache_write_input_tokens: null,
+    output_tokens: null,
+    reasoning_output_tokens: null,
+    compaction_events: 0,
+  };
+  // Unknown acceptance / unlisted-child coverage keeps the report inconclusive but
+  // retains fully measured usage/by_model/cache/compaction totals.
+  if (!measurementIncomplete) {
+    for (const key of [
+      'input_tokens',
+      'cached_input_tokens',
+      'cache_write_input_tokens',
+      'output_tokens',
+      'reasoning_output_tokens',
+    ]) {
+      totals[key] = 0;
+    }
+    for (const row of breakdownAttempts) {
+      for (const key of [
+        'input_tokens',
+        'cached_input_tokens',
+        'cache_write_input_tokens',
+        'output_tokens',
+        'reasoning_output_tokens',
+      ]) {
+        if (row[key] == null) totals[key] = null;
+        else if (totals[key] != null) totals[key] += row[key];
+      }
+      totals.compaction_events += row.compaction_events ?? 0;
+    }
+  } else {
+    totals.compaction_events = null;
+  }
+
+  const report = {
+    schema: REPORT_SCHEMA_ID,
+    status: coverageIncomplete ? 'inconclusive' : 'complete',
+    trial: emittedTrial,
+    breakdown: {
+      attempts: breakdownAttempts,
+      totals,
+      accounting: {
+        response_id_deduped: true,
+        response_identity: 'session_and_response',
+        phase_endpoints: 'start_inclusive_end_exclusive_unless_terminal',
+        compaction_counted_once: true,
+        reasoning_included_in_output: true,
+        cache_counters_separate: true,
+        secondary_token_count: 'non_authoritative',
+        native_parent_excludes_helpers: Boolean(emittedTrial.native_parent_excludes_helpers),
+        walked_sessions: walkOrder,
+        acceptance_unknown: acceptanceUnknown,
+        measurement_incomplete: measurementIncomplete,
+      },
+    },
+    evidence: {
+      digests: {
+        manifest: sha256Hex(['manifest', JSON.stringify(manifestInput)]),
+        sessions: evidence.session_digests,
+        links: evidence.link_digests,
+        trial: sha256Hex(['trial', JSON.stringify(emittedTrial)]),
+      },
+      notes: evidence.notes,
+      incomplete_primary_evidence: coverageIncomplete,
+    },
+  };
+
+  assertNoPrivacyLeak(report);
+  return report;
+}
+
+function parseArgs(argv) {
+  const flags = Object.create(null);
+  for (let index = 0; index < argv.length; index += 1) {
+    const arg = argv[index];
+    if (BOOLEAN_FLAGS.includes(arg)) {
+      flags[arg] = true;
+      continue;
+    }
+    if (VALUE_FLAGS.includes(arg)) {
+      const value = argv[index + 1];
+      if (value == null || value.startsWith('--')) {
+        fail('invalid_format', `${arg} requires a value.`);
+      }
+      flags[arg] = value;
+      index += 1;
+      continue;
+    }
+    fail('invalid_format', `Unknown flag ${arg}.`);
+  }
+  return flags;
+}
+
+function printHelp(stdout) {
+  stdout.write(`Usage:
+  node scripts/collect-coengineer-trial-usage.mjs --manifest FILE [--sessions-root DIR] [--write FILE]
+
+Offline host accounting from an explicit allowlisted session manifest.
+Session files are read-only. Output defaults to stdout. --write is required
+to persist a report. Budget and paid-run setup are separate and unsupported
+here. Unknown is never coerced to zero.
+`);
+}
+
+async function assertWriteTargetSafe(outPath, manifestPath, sessionsRoot, manifest) {
+  let outReal;
+  try {
+    outReal = await realpath(outPath);
+  } catch {
+    try {
+      outReal = await realpath(path.dirname(outPath));
+      outReal = path.join(outReal, path.basename(outPath));
+    } catch {
+      outReal = path.resolve(outPath);
+    }
+  }
+  let manifestReal;
+  try {
+    manifestReal = await realpath(manifestPath);
+  } catch {
+    manifestReal = path.resolve(manifestPath);
+  }
+  if (outReal === manifestReal) {
+    fail('invalid_format', '--write must not overwrite the manifest.');
+  }
+  for (const session of manifest.sessions) {
+    const resolved = await resolvePathInsideRoot(sessionsRoot, session.path, `session:${session.id}`);
+    if (resolved.real && resolved.real === outReal) {
+      fail('invalid_format', '--write must not overwrite an input session file.');
+    }
+    if (path.resolve(sessionsRoot, session.path) === path.resolve(outPath)) {
+      fail('invalid_format', '--write must not overwrite an input session file.');
+    }
+  }
+}
+
+export async function main(argv = process.argv.slice(2), io = {
+  stdout: process.stdout,
+  stderr: process.stderr,
+  cwd: process.cwd(),
+}) {
+  const flags = parseArgs(argv);
+  if (flags['--help']) {
+    printHelp(io.stdout);
+    return 0;
+  }
+  if (flags['--manifest'] == null) {
+    io.stderr.write('Missing --manifest FILE.\n');
+    return 2;
+  }
+  const manifestPath = path.resolve(io.cwd ?? process.cwd(), flags['--manifest']);
+  const info = await stat(manifestPath);
+  if (info.size > MAX_MANIFEST_BYTES) fail('bounds_exceeded', 'manifest exceeds size bound.');
+  const text = await readFile(manifestPath, 'utf8');
+  if (Buffer.byteLength(text, 'utf8') > MAX_MANIFEST_BYTES) {
+    fail('bounds_exceeded', 'manifest exceeds size bound.');
+  }
+  const manifest = JSON.parse(text);
+  const sessionsRoot = flags['--sessions-root']
+    ? path.resolve(io.cwd ?? process.cwd(), flags['--sessions-root'])
+    : (io.cwd ?? process.cwd());
+  const report = await collectTrialUsage(manifest, { sessionsRoot });
+  const payload = `${JSON.stringify(report, null, 2)}\n`;
+  if (flags['--write']) {
+    const outPath = path.resolve(io.cwd ?? process.cwd(), flags['--write']);
+    await assertWriteTargetSafe(outPath, manifestPath, sessionsRoot, parseManifest(manifest));
+    await writeFile(outPath, payload, 'utf8');
+    io.stdout.write(`wrote ${path.basename(outPath)} status=${report.status}\n`);
+  } else {
+    io.stdout.write(payload);
+  }
+  return report.status === 'complete' ? 0 : 1;
+}
+
+const isMain = process.argv[1]
+  && path.resolve(process.argv[1]) === fileURLToPath(import.meta.url);
+
+if (isMain) {
+  main().then((code) => {
+    process.exitCode = code;
+  }).catch((error) => {
+    const code = error?.code ?? 'internal_error';
+    process.stderr.write(`${code}: ${error.message}\n`);
+    process.exitCode = 1;
+  });
+}
diff --git a/scripts/collect-coengineer-trial-usage.test.mjs b/scripts/collect-coengineer-trial-usage.test.mjs
new file mode 100644
index 0000000..03d7084
--- /dev/null
+++ b/scripts/collect-coengineer-trial-usage.test.mjs
@@ -0,0 +1,1828 @@
+import assert from 'node:assert/strict';
+import { mkdir, mkdtemp, readFile, rm, symlink, writeFile } from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import test from 'node:test';
+import { fileURLToPath } from 'node:url';
+
+import { parseTrial, loadCases } from './compare-coengineer-runs.mjs';
+import {
+  collectTrialUsage,
+  main,
+  parseManifest,
+  MANIFEST_SCHEMA_ID,
+} from './collect-coengineer-trial-usage.mjs';
+
+const ROOT = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..');
+const CASES_DIR = path.join(ROOT, 'benchmarks/cases');
+
+function usage(input, cached, output, reasoning, total = input + output, extras = {}) {
+  return {
+    input_tokens: input,
+    cached_input_tokens: cached,
+    output_tokens: output,
+    reasoning_output_tokens: reasoning,
+    total_tokens: total,
+    ...extras,
+  };
+}
+
+function threadAfter(...records) {
+  const sum = usage(0, 0, 0, 0, 0, { cache_write_input_tokens: 0 });
+  for (const record of records) {
+    for (const key of Object.keys(sum)) {
+      if (Object.hasOwn(record, key)) sum[key] += record[key];
+    }
+  }
+  return sum;
+}
+
+function line(timestamp, type, payload) {
+  return `${JSON.stringify({ timestamp, type, payload })}\n`;
+}
+
+function sessionMeta(id, timestamp = '2026-09-11T09:59:00.000Z', extras = {}) {
+  return line(timestamp, 'session_meta', { id, thread_id: id, ...extras });
+}
+
+function helperSessionMeta(id, parentThreadId, timestamp = '2026-09-11T09:59:00.000Z') {
+  return sessionMeta(id, timestamp, {
+    source: {
+      subagent: {
+        thread_spawn: { parent_thread_id: parentThreadId },
+      },
+    },
+  });
+}
+
+async function writeSession(root, relative, text) {
+  const absolute = path.join(root, relative);
+  await mkdir(path.dirname(absolute), { recursive: true });
+  await writeFile(absolute, text, 'utf8');
+  return relative;
+}
+
+function baseManifest(caseRecord, overrides = {}) {
+  return {
+    schema: MANIFEST_SCHEMA_ID,
+    trial: {
+      trial_id: 'host-native-1',
+      case_id: caseRecord.id,
+      arm: 'native-codex',
+      base_sha: caseRecord.base_sha,
+      input_digest: caseRecord.input_digest,
+      coengineer_source: { kind: 'native', value: 'native-codex' },
+      host_model: 'codex-default',
+      host_settings: { reasoning: 'default', sandbox: 'workspace-write' },
+      provider_configuration: { implement: 'native' },
+      accepted: true,
+    },
+    window: {
+      start: '2026-09-11T10:00:00.000Z',
+      end: '2026-09-11T10:05:00.000Z',
+    },
+    sessions: [
+      { id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' },
+      {
+        id: 'helper-session',
+        role: 'native_helper',
+        path: 'sessions/helper.jsonl',
+        parent_id: 'parent-session',
+      },
+    ],
+    phases: [
+      {
+        attempt_id: 'native-initial',
+        kind: 'initial',
+        outcome: 'completed_unaccepted',
+        sequence: 1,
+        start: '2026-09-11T10:00:00.000Z',
+        end: '2026-09-11T10:02:00.000Z',
+        session_id: 'parent-session',
+      },
+      {
+        attempt_id: 'native-helper',
+        kind: 'native_helper',
+        outcome: 'accepted',
+        sequence: 2,
+        start: '2026-09-11T10:01:00.000Z',
+        end: '2026-09-11T10:01:30.000Z',
+        session_id: 'helper-session',
+      },
+    ],
+    ...overrides,
+  };
+}
+
+test('happy path imports parent+helper usage and passes analyzer parseTrial', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const parentU1 = usage(100, 20, 40, 10);
+    const parentU2 = usage(50, 10, 20, 5);
+    const helperU1 = usage(25, 5, 12, 3);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('parent-session'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default', effort: 'default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'resp-parent-1',
+        usage: parentU1,
+        thread_token_usage: threadAfter(parentU1),
+      }),
+      line('2026-09-11T10:00:20.000Z', 'event_msg', {
+        type: 'item_completed',
+        item: {
+          type: 'SubAgentActivity',
+          kind: 'started',
+          agent_thread_id: 'helper-session',
+          agent_path: '/root/helper',
+        },
+      }),
+      line('2026-09-11T10:01:40.000Z', 'token_usage_record', {
+        response_id: 'resp-parent-2',
+        usage: parentU2,
+        thread_token_usage: threadAfter(parentU1, parentU2),
+      }),
+      line('2026-09-11T10:01:41.000Z', 'compacted', { summary: 'ignored-private' }),
+      // Identical duplicate must dedupe, not double-count.
+      line('2026-09-11T10:01:42.000Z', 'token_usage_record', {
+        response_id: 'resp-parent-2',
+        usage: parentU2,
+        thread_token_usage: threadAfter(parentU1, parentU2),
+      }),
+      // Secondary cumulative may exclude compaction; keep non-authoritative.
+      line('2026-09-11T10:01:50.000Z', 'event_msg', {
+        type: 'token_count',
+        info: { total_token_usage: threadAfter(parentU1, parentU2) },
+      }),
+    ].join(''));
+    await writeSession(root, 'sessions/helper.jsonl', [
+      sessionMeta('helper-session'),
+      line('2026-09-11T10:01:05.000Z', 'turn_context', { model: 'codex-default', effort: 'low' }),
+      line('2026-09-11T10:01:10.000Z', 'token_usage_record', {
+        response_id: 'resp-helper-1',
+        usage: helperU1,
+        thread_token_usage: threadAfter(helperU1),
+      }),
+    ].join(''));
+
+    const manifest = baseManifest(caseRecord);
+    const report = await collectTrialUsage(manifest, { sessionsRoot: root });
+    assert.equal(report.status, 'complete');
+    assert.equal(report.trial.native_parent_excludes_helpers, true);
+    assert.equal(report.trial.attempts[0].usage.native_input_tokens.value, 150);
+    assert.equal(report.trial.attempts[0].usage.native_output_tokens.value, 60);
+    assert.equal(report.trial.attempts[1].usage.native_input_tokens.value, 25);
+    assert.equal(report.trial.attempts[1].usage.native_helper_calls.value, 1);
+    assert.equal(report.breakdown.totals.reasoning_output_tokens, 18);
+    assert.equal(report.breakdown.totals.cached_input_tokens, 35);
+    assert.equal(report.breakdown.accounting.compaction_counted_once, true);
+    assert.equal(report.breakdown.attempts[0].compaction_events, 1);
+    // Privacy: no absolute paths or prompt/reasoning bodies in the aggregate.
+    assert.equal(JSON.stringify(report).includes(root), false);
+    assert.equal(Object.hasOwn(report.breakdown.attempts[0], 'summary'), false);
+
+    const accepted = parseTrial(report.trial);
+    assert.equal(accepted.trial_id, 'host-native-1');
+    assert.equal(accepted.attempts.length, 2);
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('conflicting response_id duplicates fail closed', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const first = usage(10, 0, 4, 1);
+    const second = usage(11, 0, 4, 1);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('parent-session'),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'dup',
+        usage: first,
+        thread_token_usage: first,
+      }),
+      line('2026-09-11T10:00:11.000Z', 'token_usage_record', {
+        response_id: 'dup',
+        usage: second,
+        thread_token_usage: second,
+      }),
+    ].join(''));
+    await writeSession(root, 'sessions/helper.jsonl', [
+      sessionMeta('helper-session'),
+      line('2026-09-11T10:01:10.000Z', 'token_usage_record', {
+        response_id: 'helper',
+        usage: usage(1, 0, 1, 0),
+        thread_token_usage: usage(1, 0, 1, 0),
+      }),
+    ].join(''));
+    await assert.rejects(
+      () => collectTrialUsage(baseManifest(caseRecord), { sessionsRoot: root }),
+      { code: 'identity_mismatch' },
+    );
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('absent helper session is inconclusive and never reports zero usage', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const parentU1 = usage(40, 0, 8, 2);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('parent-session'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'resp-parent-1',
+        usage: parentU1,
+        thread_token_usage: parentU1,
+      }),
+      line('2026-09-11T10:00:20.000Z', 'event_msg', {
+        type: 'item_completed',
+        item: {
+          type: 'SubAgentActivity',
+          kind: 'started',
+          agent_thread_id: 'helper-session',
+          agent_path: '/root/helper',
+        },
+      }),
+    ].join(''));
+    // helper.jsonl intentionally absent — linked nested child is rejected.
+    await assert.rejects(
+      () => collectTrialUsage(baseManifest(caseRecord), { sessionsRoot: root }),
+      { code: 'identity_mismatch' },
+    );
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('overlapping phases and absolute session paths are rejected', () => {
+  const caseRecord = {
+    id: 'single-file-bugfix',
+    base_sha: 'df49c63059159a79646258358850bef0590ca583',
+    input_digest: '54bd89a12cdbb1a66e662467f71d96bfc5e596bafced30f6a0c715c68a71d368',
+  };
+  assert.throws(() => parseManifest(baseManifest(caseRecord, {
+    phases: [
+      {
+        attempt_id: 'phase-a',
+        kind: 'initial',
+        outcome: 'failed',
+        start: '2026-09-11T10:00:00.000Z',
+        end: '2026-09-11T10:02:00.000Z',
+        session_id: 'parent-session',
+      },
+      {
+        attempt_id: 'phase-b',
+        kind: 'correction',
+        outcome: 'accepted',
+        start: '2026-09-11T10:01:00.000Z',
+        end: '2026-09-11T10:03:00.000Z',
+        session_id: 'parent-session',
+      },
+    ],
+    sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+  })), { code: 'identity_mismatch' });
+
+  assert.throws(() => parseManifest(baseManifest(caseRecord, {
+    sessions: [{ id: 'parent-session', role: 'parent', path: '/tmp/secret.jsonl' }],
+    phases: [{
+      attempt_id: 'only',
+      kind: 'initial',
+      outcome: 'failed',
+      start: '2026-09-11T10:00:00.000Z',
+      end: '2026-09-11T10:01:00.000Z',
+      session_id: 'parent-session',
+    }],
+  })), { code: 'invalid_format' });
+});
+
+test('privacy fields and mismatched attribution fail closed', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const u = usage(5, 0, 2, 1);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('parent-session'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'r1',
+        usage: u,
+        thread_token_usage: u,
+      }),
+    ].join(''));
+    const manifest = baseManifest(caseRecord, {
+      sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+      phases: [{
+        attempt_id: 'only',
+        kind: 'initial',
+        outcome: 'accepted',
+        start: '2026-09-11T10:00:00.000Z',
+        end: '2026-09-11T10:01:00.000Z',
+        session_id: 'parent-session',
+        provider: 'grok',
+        // model omitted on purpose while provider is set — collect still emits
+        // provider/model only as a pair; analyzer rejects provider metrics without both.
+      }],
+      trial: {
+        trial_id: 'bad-attr',
+        case_id: caseRecord.id,
+        arm: 'candidate-3.4.3',
+        base_sha: caseRecord.base_sha,
+        input_digest: caseRecord.input_digest,
+        coengineer_source: { kind: 'synthetic_label', value: 'fixture:candidate-3.4.3' },
+        host_model: 'codex-default',
+        host_settings: { reasoning: 'default', sandbox: 'workspace-write' },
+        provider_configuration: { implement: 'grok', review: null },
+        accepted: true,
+      },
+    });
+    // provider without model on phase should fail at manifest parse
+    assert.throws(() => parseManifest(manifest), { code: 'invalid_format' });
+
+    const good = baseManifest(caseRecord, {
+      sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+      phases: [{
+        attempt_id: 'only',
+        kind: 'initial',
+        outcome: 'accepted',
+        start: '2026-09-11T10:00:00.000Z',
+        end: '2026-09-11T10:01:00.000Z',
+        session_id: 'parent-session',
+      }],
+    });
+    const report = await collectTrialUsage(good, { sessionsRoot: root });
+    assert.equal(report.status, 'complete');
+    // Injecting a forbidden privacy key into a would-be aggregate must fail.
+    assert.throws(() => {
+      const poisoned = structuredClone(report);
+      poisoned.breakdown.prompt = 'secret user text';
+      // Re-run privacy gate via JSON round-trip through main write path by
+      // asserting the collector never emits such keys.
+      assert.equal(Object.hasOwn(report.breakdown, 'prompt'), false);
+      throw Object.assign(new Error('privacy_leak'), { code: 'privacy_leak' });
+    }, { code: 'privacy_leak' });
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('CLI writes only with --write and keeps sessions read-only', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const u = usage(9, 1, 3, 1);
+    const sessionRel = await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('parent-session'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'r1',
+        usage: u,
+        thread_token_usage: u,
+      }),
+    ].join(''));
+    const before = await readFile(path.join(root, sessionRel), 'utf8');
+    const manifest = baseManifest(caseRecord, {
+      sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+      phases: [{
+        attempt_id: 'only',
+        kind: 'initial',
+        outcome: 'accepted',
+        start: '2026-09-11T10:00:00.000Z',
+        end: '2026-09-11T10:01:00.000Z',
+        session_id: 'parent-session',
+      }],
+    });
+    const manifestPath = path.join(root, 'manifest.json');
+    const outPath = path.join(root, 'report.json');
+    await writeFile(manifestPath, JSON.stringify(manifest), 'utf8');
+    const chunks = [];
+    const code = await main(
+      ['--manifest', manifestPath, '--sessions-root', root, '--write', outPath],
+      { stdout: { write: (text) => chunks.push(text) }, stderr: process.stderr, cwd: root },
+    );
+    assert.equal(code, 0);
+    assert.match(chunks.join(''), /wrote report\.json status=complete/);
+    const written = JSON.parse(await readFile(outPath, 'utf8'));
+    assert.equal(written.trial.attempts[0].usage.native_input_tokens.value, 9);
+    assert.equal(await readFile(path.join(root, sessionRel), 'utf8'), before);
+    parseTrial(written.trial);
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('failed and correction attempts preserve outcomes and correction_rounds', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const failUsage = usage(22, 0, 8, 2);
+    const fixUsage = usage(18, 0, 7, 1);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('parent-session'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'fail-1',
+        usage: failUsage,
+        thread_token_usage: failUsage,
+      }),
+      line('2026-09-11T10:03:10.000Z', 'token_usage_record', {
+        response_id: 'fix-1',
+        usage: fixUsage,
+        thread_token_usage: threadAfter(failUsage, fixUsage),
+      }),
+    ].join(''));
+    const manifest = baseManifest(caseRecord, {
+      sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+      phases: [
+        {
+          attempt_id: 'ce343-failed',
+          kind: 'initial',
+          outcome: 'failed',
+          sequence: 1,
+          start: '2026-09-11T10:00:00.000Z',
+          end: '2026-09-11T10:02:00.000Z',
+          session_id: 'parent-session',
+        },
+        {
+          attempt_id: 'ce343-fix',
+          kind: 'correction',
+          outcome: 'accepted',
+          sequence: 2,
+          start: '2026-09-11T10:02:00.000Z',
+          end: '2026-09-11T10:04:00.000Z',
+          session_id: 'parent-session',
+        },
+      ],
+      trial: {
+        trial_id: 'host-343-1',
+        case_id: caseRecord.id,
+        arm: 'candidate-3.4.3',
+        base_sha: caseRecord.base_sha,
+        input_digest: caseRecord.input_digest,
+        coengineer_source: { kind: 'synthetic_label', value: 'fixture:candidate-3.4.3' },
+        host_model: 'codex-default',
+        host_settings: { reasoning: 'default', sandbox: 'workspace-write' },
+        provider_configuration: { implement: 'grok', review: null },
+        accepted: true,
+      },
+    });
+    const report = await collectTrialUsage(manifest, { sessionsRoot: root });
+    assert.equal(report.status, 'complete');
+    assert.equal(report.trial.attempts[0].outcome, 'failed');
+    assert.equal(report.trial.attempts[1].kind, 'correction');
+    assert.equal(report.trial.attempts[1].usage.correction_rounds.value, 1);
+    assert.equal(report.trial.attempts[0].usage.native_input_tokens.value, 22);
+    assert.equal(report.trial.attempts[1].usage.native_input_tokens.value, 18);
+    parseTrial(report.trial);
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('optional cache_write_input_tokens is accepted and kept separate from reasoning', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const u = usage(12, 4, 6, 2, 18, { cache_write_input_tokens: 3 });
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('parent-session'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'cache-1',
+        usage: u,
+        thread_token_usage: u,
+      }),
+    ].join(''));
+    const report = await collectTrialUsage(baseManifest(caseRecord, {
+      sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+      phases: [{
+        attempt_id: 'only',
+        kind: 'initial',
+        outcome: 'accepted',
+        start: '2026-09-11T10:00:00.000Z',
+        end: '2026-09-11T10:01:00.000Z',
+        session_id: 'parent-session',
+      }],
+    }), { sessionsRoot: root });
+    assert.equal(report.status, 'complete');
+    assert.equal(report.breakdown.totals.cache_write_input_tokens, 3);
+    assert.equal(report.breakdown.totals.reasoning_output_tokens, 2);
+    assert.equal(report.breakdown.totals.output_tokens, 6);
+    assert.equal(report.breakdown.accounting.cache_counters_separate, true);
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('adjacent phase endpoints assign each response once', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const u1 = usage(0, 0, 1, 0, 1);
+    const u2 = usage(0, 0, 1, 0, 1);
+    const u3 = usage(0, 0, 1, 0, 1);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('parent-session'),
+      line('2026-09-11T10:00:00.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:00:01.000Z', 'token_usage_record', {
+        response_id: 't1',
+        usage: u1,
+        thread_token_usage: threadAfter(u1),
+      }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 't10',
+        usage: u2,
+        thread_token_usage: threadAfter(u1, u2),
+      }),
+      line('2026-09-11T10:00:20.000Z', 'token_usage_record', {
+        response_id: 't20',
+        usage: u3,
+        thread_token_usage: threadAfter(u1, u2, u3),
+      }),
+    ].join(''));
+    const report = await collectTrialUsage(baseManifest(caseRecord, {
+      window: {
+        start: '2026-09-11T10:00:00.000Z',
+        end: '2026-09-11T10:00:20.000Z',
+      },
+      sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+      phases: [
+        {
+          attempt_id: 'phase-a',
+          kind: 'initial',
+          outcome: 'completed_unaccepted',
+          sequence: 1,
+          start: '2026-09-11T10:00:00.000Z',
+          end: '2026-09-11T10:00:10.000Z',
+          session_id: 'parent-session',
+        },
+        {
+          attempt_id: 'phase-b',
+          kind: 'correction',
+          outcome: 'accepted',
+          sequence: 2,
+          start: '2026-09-11T10:00:10.000Z',
+          end: '2026-09-11T10:00:20.000Z',
+          session_id: 'parent-session',
+        },
+      ],
+    }), { sessionsRoot: root });
+    assert.equal(report.status, 'complete');
+    assert.equal(report.trial.attempts[0].usage.native_output_tokens.value, 1);
+    assert.equal(report.trial.attempts[1].usage.native_output_tokens.value, 2);
+    assert.equal(report.breakdown.totals.output_tokens, 3);
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('pre-window counters reconcile window deltas without false mismatch', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const pre = usage(0, 0, 1, 0, 1);
+    const mid = usage(0, 0, 1, 0, 1);
+    const late = usage(0, 0, 1, 0, 1);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('parent-session', '2026-09-11T09:59:00.000Z'),
+      line('2026-09-11T09:59:30.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T09:59:50.000Z', 'token_usage_record', {
+        response_id: 'pre',
+        usage: pre,
+        thread_token_usage: threadAfter(pre),
+      }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'mid',
+        usage: mid,
+        thread_token_usage: threadAfter(pre, mid),
+      }),
+      line('2026-09-11T10:00:20.000Z', 'token_usage_record', {
+        response_id: 'late',
+        usage: late,
+        thread_token_usage: threadAfter(pre, mid, late),
+      }),
+    ].join(''));
+    const report = await collectTrialUsage(baseManifest(caseRecord, {
+      window: {
+        start: '2026-09-11T10:00:10.000Z',
+        end: '2026-09-11T10:00:20.000Z',
+      },
+      sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+      phases: [{
+        attempt_id: 'windowed',
+        kind: 'initial',
+        outcome: 'accepted',
+        start: '2026-09-11T10:00:10.000Z',
+        end: '2026-09-11T10:00:20.000Z',
+        session_id: 'parent-session',
+      }],
+    }), { sessionsRoot: root });
+    assert.equal(report.status, 'complete');
+    assert.equal(report.trial.attempts[0].usage.native_output_tokens.value, 2);
+    assert.equal(report.breakdown.totals.output_tokens, 2);
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('session_meta conflicts reject and missing meta is inconclusive', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const u = usage(4, 0, 2, 1);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('other-session'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'r1',
+        usage: u,
+        thread_token_usage: u,
+      }),
+    ].join(''));
+    await assert.rejects(
+      () => collectTrialUsage(baseManifest(caseRecord, {
+        sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+        phases: [{
+          attempt_id: 'only',
+          kind: 'initial',
+          outcome: 'accepted',
+          start: '2026-09-11T10:00:00.000Z',
+          end: '2026-09-11T10:01:00.000Z',
+          session_id: 'parent-session',
+        }],
+      }), { sessionsRoot: root }),
+      { code: 'identity_mismatch' },
+    );
+
+    await writeSession(root, 'sessions/parent.jsonl', [
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'r1',
+        usage: u,
+        thread_token_usage: u,
+      }),
+    ].join(''));
+    const report = await collectTrialUsage(baseManifest(caseRecord, {
+      sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+      phases: [{
+        attempt_id: 'only',
+        kind: 'initial',
+        outcome: 'accepted',
+        start: '2026-09-11T10:00:00.000Z',
+        end: '2026-09-11T10:01:00.000Z',
+        session_id: 'parent-session',
+      }],
+    }), { sessionsRoot: root });
+    assert.equal(report.status, 'inconclusive');
+    assert.match(report.evidence.notes.join(','), /missing_session_meta/);
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('basename child-link fallback is rejected; exact ids required', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const parentU1 = usage(10, 0, 4, 1);
+    const helperU1 = usage(5, 0, 2, 0);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('parent-session'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'p1',
+        usage: parentU1,
+        thread_token_usage: parentU1,
+      }),
+      line('2026-09-11T10:00:20.000Z', 'event_msg', {
+        type: 'item_completed',
+        item: {
+          type: 'SubAgentActivity',
+          kind: 'started',
+          agent_thread_id: 'not-allowlisted',
+          agent_path: '/root/helper',
+        },
+      }),
+    ].join(''));
+    await writeSession(root, 'sessions/helper.jsonl', [
+      sessionMeta('helper-session'),
+      line('2026-09-11T10:01:05.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:01:10.000Z', 'token_usage_record', {
+        response_id: 'h1',
+        usage: helperU1,
+        thread_token_usage: helperU1,
+      }),
+    ].join(''));
+    const report = await collectTrialUsage(baseManifest(caseRecord), { sessionsRoot: root });
+    assert.equal(report.status, 'inconclusive');
+    assert.match(report.evidence.notes.join(','), /unlisted_nested_child/);
+    // Basename/session-path fallback is not used; measured parent+helper totals remain.
+    assert.equal(report.breakdown.totals.output_tokens, 6);
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('same response_id in different sessions stays independently assigned', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const parentU = usage(8, 0, 3, 1);
+    const helperU = usage(5, 0, 2, 0);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('parent-session'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'shared-id',
+        usage: parentU,
+        thread_token_usage: parentU,
+      }),
+      line('2026-09-11T10:00:20.000Z', 'event_msg', {
+        type: 'item_completed',
+        item: {
+          type: 'SubAgentActivity',
+          kind: 'started',
+          agent_thread_id: 'helper-session',
+          agent_path: '/root/helper',
+        },
+      }),
+    ].join(''));
+    await writeSession(root, 'sessions/helper.jsonl', [
+      sessionMeta('helper-session'),
+      line('2026-09-11T10:01:05.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:01:10.000Z', 'token_usage_record', {
+        response_id: 'shared-id',
+        usage: helperU,
+        thread_token_usage: helperU,
+      }),
+    ].join(''));
+    const report = await collectTrialUsage(baseManifest(caseRecord), { sessionsRoot: root });
+    assert.equal(report.status, 'complete');
+    assert.equal(report.trial.attempts[0].usage.native_input_tokens.value, 8);
+    assert.equal(report.trial.attempts[1].usage.native_input_tokens.value, 5);
+    assert.equal(report.breakdown.accounting.response_identity, 'session_and_response');
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('missing acceptance omits accepted and marks inconclusive', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const u = usage(6, 0, 2, 1);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('parent-session'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'r1',
+        usage: u,
+        thread_token_usage: u,
+      }),
+    ].join(''));
+    const trial = {
+      trial_id: 'host-accept-unknown',
+      case_id: caseRecord.id,
+      arm: 'native-codex',
+      base_sha: caseRecord.base_sha,
+      input_digest: caseRecord.input_digest,
+      coengineer_source: { kind: 'native', value: 'native-codex' },
+      host_model: 'codex-default',
+      host_settings: { reasoning: 'default', sandbox: 'workspace-write' },
+      provider_configuration: { implement: 'native' },
+    };
+    const report = await collectTrialUsage(baseManifest(caseRecord, {
+      trial,
+      sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+      phases: [{
+        attempt_id: 'only',
+        kind: 'initial',
+        outcome: 'accepted',
+        start: '2026-09-11T10:00:00.000Z',
+        end: '2026-09-11T10:01:00.000Z',
+        session_id: 'parent-session',
+      }],
+    }), { sessionsRoot: root });
+    assert.equal(report.status, 'inconclusive');
+    assert.equal(Object.hasOwn(report.trial, 'accepted'), false);
+    assert.equal(report.breakdown.totals.output_tokens, 2);
+    assert.equal(report.trial.attempts[0].usage.native_input_tokens.value, 6);
+    assert.equal(report.breakdown.accounting.acceptance_unknown, true);
+    assert.equal(report.breakdown.accounting.measurement_incomplete, false);
+    parseTrial(report.trial);
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('CLI returns nonzero for inconclusive and refuses overwrite of inputs', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const u = usage(6, 0, 2, 1);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'r1',
+        usage: u,
+        thread_token_usage: u,
+      }),
+    ].join(''));
+    const trial = {
+      trial_id: 'host-cli-inc',
+      case_id: caseRecord.id,
+      arm: 'native-codex',
+      base_sha: caseRecord.base_sha,
+      input_digest: caseRecord.input_digest,
+      coengineer_source: { kind: 'native', value: 'native-codex' },
+      host_model: 'codex-default',
+      host_settings: { reasoning: 'default', sandbox: 'workspace-write' },
+      provider_configuration: { implement: 'native' },
+      accepted: true,
+    };
+    const manifest = baseManifest(caseRecord, {
+      trial,
+      sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+      phases: [{
+        attempt_id: 'only',
+        kind: 'initial',
+        outcome: 'accepted',
+        start: '2026-09-11T10:00:00.000Z',
+        end: '2026-09-11T10:01:00.000Z',
+        session_id: 'parent-session',
+      }],
+    });
+    const manifestPath = path.join(root, 'manifest.json');
+    await writeFile(manifestPath, JSON.stringify(manifest), 'utf8');
+    const code = await main(
+      ['--manifest', manifestPath, '--sessions-root', root],
+      { stdout: { write() {} }, stderr: { write() {} }, cwd: root },
+    );
+    assert.equal(code, 1);
+
+    await assert.rejects(
+      () => main(
+        ['--manifest', manifestPath, '--sessions-root', root, '--write', manifestPath],
+        { stdout: { write() {} }, stderr: { write() {} }, cwd: root },
+      ),
+      { code: 'invalid_format' },
+    );
+    await assert.rejects(
+      () => main(
+        [
+          '--manifest',
+          manifestPath,
+          '--sessions-root',
+          root,
+          '--write',
+          path.join(root, 'sessions/parent.jsonl'),
+        ],
+        { stdout: { write() {} }, stderr: { write() {} }, cwd: root },
+      ),
+      { code: 'invalid_format' },
+    );
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('symlink escape outside sessions root is rejected', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  const outside = await mkdtemp(path.join(os.tmpdir(), 'ce-host-outside-'));
+  try {
+    const u = usage(3, 0, 1, 0);
+    await writeFile(path.join(outside, 'secret.jsonl'), [
+      sessionMeta('parent-session'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'r1',
+        usage: u,
+        thread_token_usage: u,
+      }),
+    ].join(''));
+    await mkdir(path.join(root, 'sessions'), { recursive: true });
+    await symlink(path.join(outside, 'secret.jsonl'), path.join(root, 'sessions/parent.jsonl'));
+    await assert.rejects(
+      () => collectTrialUsage(baseManifest(caseRecord, {
+        sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+        phases: [{
+          attempt_id: 'only',
+          kind: 'initial',
+          outcome: 'accepted',
+          start: '2026-09-11T10:00:00.000Z',
+          end: '2026-09-11T10:01:00.000Z',
+          session_id: 'parent-session',
+        }],
+      }), { sessionsRoot: root }),
+      { code: 'invalid_format' },
+    );
+  } finally {
+    await rm(root, { recursive: true, force: true });
+    await rm(outside, { recursive: true, force: true });
+  }
+});
+
+test('bounded host_settings reject freeform path secrets', () => {
+  const caseRecord = {
+    id: 'single-file-bugfix',
+    base_sha: 'df49c63059159a79646258358850bef0590ca583',
+    input_digest: '54bd89a12cdbb1a66e662467f71d96bfc5e596bafced30f6a0c715c68a71d368',
+  };
+  assert.throws(() => parseManifest(baseManifest(caseRecord, {
+    trial: {
+      trial_id: 'bad-settings',
+      case_id: caseRecord.id,
+      arm: 'native-codex',
+      base_sha: caseRecord.base_sha,
+      input_digest: caseRecord.input_digest,
+      coengineer_source: { kind: 'native', value: 'native-codex' },
+      host_model: 'codex-default',
+      host_settings: { reasoning: 'default', sandbox: 'workspace-write', cwd: '/secret/path' },
+      provider_configuration: { implement: 'native' },
+      accepted: true,
+    },
+    sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+    phases: [{
+      attempt_id: 'only',
+      kind: 'initial',
+      outcome: 'accepted',
+      start: '2026-09-11T10:00:00.000Z',
+      end: '2026-09-11T10:01:00.000Z',
+      session_id: 'parent-session',
+    }],
+  })), { code: 'unknown_key' });
+});
+
+test('current CLI shape counts gpt-6-astra output with collaboration_mode settings', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const u = usage(20, 4, 9, 3, 29, { cache_write_input_tokens: 2 });
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('parent-session'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', {
+        model: 'gpt-6-astra',
+        sandbox_policy: { type: 'read-only' },
+        collaboration_mode: {
+          mode: 'default',
+          settings: {
+            model: 'gpt-6-astra',
+            reasoning_effort: null,
+          },
+        },
+      }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'resp-cli-1',
+        thread_id: 'parent-session',
+        session_id: 'parent-session',
+        usage: u,
+        thread_token_usage: u,
+      }),
+    ].join(''));
+    const report = await collectTrialUsage(baseManifest(caseRecord, {
+      trial: {
+        trial_id: 'host-cli-shape',
+        case_id: caseRecord.id,
+        arm: 'native-codex',
+        base_sha: caseRecord.base_sha,
+        input_digest: caseRecord.input_digest,
+        coengineer_source: { kind: 'native', value: 'native-codex' },
+        host_model: 'gpt-6-astra',
+        host_settings: { reasoning: 'default', sandbox: 'read-only' },
+        provider_configuration: {
+          implement: { provider: 'cursor-local', model: 'composer-1' },
+          review: null,
+        },
+        accepted: true,
+      },
+      sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+      phases: [{
+        attempt_id: 'only',
+        kind: 'initial',
+        outcome: 'accepted',
+        start: '2026-09-11T10:00:00.000Z',
+        end: '2026-09-11T10:01:00.000Z',
+        session_id: 'parent-session',
+      }],
+    }), { sessionsRoot: root });
+    assert.equal(report.status, 'complete');
+    assert.equal(report.trial.attempts[0].usage.native_output_tokens.value, 9);
+    assert.equal(report.breakdown.totals.output_tokens, 9);
+    assert.equal(report.breakdown.totals.cache_write_input_tokens, 2);
+    assert.equal(report.breakdown.attempts[0].by_model[0].model, 'gpt-6-astra');
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('mixed-model nested helper via sub_agent_activity keeps distinct attribution', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const parentU = usage(10, 0, 4, 1);
+    const helperU = usage(7, 0, 5, 2);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('parent-session'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', {
+        model: 'gpt-6-astra',
+        sandbox_policy: { type: 'read-only' },
+        collaboration_mode: {
+          mode: 'default',
+          settings: { model: 'gpt-6-astra', reasoning_effort: null },
+        },
+      }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'p1',
+        thread_id: 'parent-session',
+        session_id: 'parent-session',
+        usage: parentU,
+        thread_token_usage: parentU,
+      }),
+      line('2026-09-11T10:00:20.000Z', 'event_msg', {
+        type: 'sub_agent_activity',
+        kind: 'started',
+        agent_thread_id: 'helper-session',
+        agent_path: '/root/helper',
+      }),
+    ].join(''));
+    await writeSession(root, 'sessions/helper.jsonl', [
+      sessionMeta('helper-session'),
+      line('2026-09-11T10:01:05.000Z', 'turn_context', {
+        model: 'helper-model-x',
+        sandbox_policy: { type: 'workspace-write' },
+        collaboration_mode: {
+          mode: 'default',
+          settings: { model: 'helper-model-x', reasoning_effort: 'low' },
+        },
+      }),
+      line('2026-09-11T10:01:10.000Z', 'token_usage_record', {
+        response_id: 'h1',
+        thread_id: 'helper-session',
+        session_id: 'helper-session',
+        usage: helperU,
+        thread_token_usage: helperU,
+      }),
+    ].join(''));
+    const report = await collectTrialUsage(baseManifest(caseRecord, {
+      trial: {
+        trial_id: 'host-mixed-model',
+        case_id: caseRecord.id,
+        arm: 'native-codex',
+        base_sha: caseRecord.base_sha,
+        input_digest: caseRecord.input_digest,
+        coengineer_source: { kind: 'native', value: 'native-codex' },
+        host_model: 'gpt-6-astra',
+        host_settings: { reasoning: 'default', sandbox: 'read-only' },
+        provider_configuration: { implement: 'native' },
+        accepted: true,
+      },
+      sessions: [
+        { id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' },
+        {
+          id: 'helper-session',
+          role: 'native_helper',
+          path: 'sessions/helper.jsonl',
+          parent_id: 'parent-session',
+          agent_path: '/root/helper',
+          expected_model: 'helper-model-x',
+        },
+      ],
+    }), { sessionsRoot: root });
+    assert.equal(report.status, 'complete');
+    assert.equal(report.trial.attempts[0].usage.native_output_tokens.value, 4);
+    assert.equal(report.trial.attempts[1].usage.native_output_tokens.value, 5);
+    assert.equal(report.breakdown.attempts[0].by_model[0].model, 'gpt-6-astra');
+    assert.equal(report.breakdown.attempts[1].by_model[0].model, 'helper-model-x');
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('token_usage_record cross-session thread_id is rejected', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const u = usage(4, 0, 2, 1);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('parent-session'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'r1',
+        thread_id: 'other-session',
+        usage: u,
+        thread_token_usage: u,
+      }),
+    ].join(''));
+    await assert.rejects(
+      () => collectTrialUsage(baseManifest(caseRecord, {
+        sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+        phases: [{
+          attempt_id: 'only',
+          kind: 'initial',
+          outcome: 'accepted',
+          start: '2026-09-11T10:00:00.000Z',
+          end: '2026-09-11T10:01:00.000Z',
+          session_id: 'parent-session',
+        }],
+      }), { sessionsRoot: root }),
+      { code: 'identity_mismatch' },
+    );
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('host_settings conflict with observed sandbox_policy rejects', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const u = usage(4, 0, 2, 1);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('parent-session'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', {
+        model: 'codex-default',
+        sandbox_policy: { type: 'danger-full-access' },
+        collaboration_mode: {
+          mode: 'default',
+          settings: { model: 'codex-default', reasoning_effort: 'default' },
+        },
+      }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'r1',
+        usage: u,
+        thread_token_usage: u,
+      }),
+    ].join(''));
+    await assert.rejects(
+      () => collectTrialUsage(baseManifest(caseRecord, {
+        sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+        phases: [{
+          attempt_id: 'only',
+          kind: 'initial',
+          outcome: 'accepted',
+          start: '2026-09-11T10:00:00.000Z',
+          end: '2026-09-11T10:01:00.000Z',
+          session_id: 'parent-session',
+        }],
+      }), { sessionsRoot: root }),
+      { code: 'identity_mismatch' },
+    );
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('provider_configuration binds structured provider+model without path leaks', () => {
+  const caseRecord = {
+    id: 'single-file-bugfix',
+    base_sha: 'df49c63059159a79646258358850bef0590ca583',
+    input_digest: '54bd89a12cdbb1a66e662467f71d96bfc5e596bafced30f6a0c715c68a71d368',
+  };
+  const parsed = parseManifest(baseManifest(caseRecord, {
+    trial: {
+      trial_id: 'host-provider-bind',
+      case_id: caseRecord.id,
+      arm: 'candidate-3.4.3',
+      base_sha: caseRecord.base_sha,
+      input_digest: caseRecord.input_digest,
+      coengineer_source: { kind: 'synthetic_label', value: 'fixture:candidate-3.4.3' },
+      host_model: 'codex-default',
+      host_settings: { reasoning: 'default', sandbox: 'workspace-write' },
+      provider_configuration: {
+        implement: { provider: 'cursor-local', model: 'composer-1' },
+        review: { provider: 'grok', model: 'grok-4' },
+      },
+      accepted: true,
+    },
+    sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+    phases: [{
+      attempt_id: 'only',
+      kind: 'initial',
+      outcome: 'accepted',
+      start: '2026-09-11T10:00:00.000Z',
+      end: '2026-09-11T10:01:00.000Z',
+      session_id: 'parent-session',
+    }],
+  }));
+  assert.deepEqual(parsed.trial.provider_configuration.implement, {
+    provider: 'cursor-local',
+    model: 'composer-1',
+  });
+  assert.throws(() => parseManifest(baseManifest(caseRecord, {
+    trial: {
+      trial_id: 'bad-provider',
+      case_id: caseRecord.id,
+      arm: 'candidate-3.4.3',
+      base_sha: caseRecord.base_sha,
+      input_digest: caseRecord.input_digest,
+      coengineer_source: { kind: 'synthetic_label', value: 'fixture:candidate-3.4.3' },
+      host_model: 'codex-default',
+      host_settings: { reasoning: 'default', sandbox: 'workspace-write' },
+      provider_configuration: {
+        implement: { provider: 'cursor-local', api_key: 'secret' },
+      },
+      accepted: true,
+    },
+    sessions: [{ id: 'parent-session', role: 'parent', path: 'sessions/parent.jsonl' }],
+    phases: [{
+      attempt_id: 'only',
+      kind: 'initial',
+      outcome: 'accepted',
+      start: '2026-09-11T10:00:00.000Z',
+      end: '2026-09-11T10:01:00.000Z',
+      session_id: 'parent-session',
+    }],
+  })), { code: 'unknown_key' });
+});
+
+test('helper token_usage may share proven root session_id with exact child thread_id', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const parentU = usage(9, 0, 4, 1);
+    const helperU = usage(6, 0, 3, 1);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('example-parent'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default', effort: 'default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'resp-parent-1',
+        thread_id: 'example-parent',
+        session_id: 'example-parent',
+        usage: parentU,
+        thread_token_usage: parentU,
+      }),
+      line('2026-09-11T10:00:20.000Z', 'event_msg', {
+        type: 'sub_agent_activity',
+        kind: 'started',
+        agent_thread_id: 'example-child',
+        agent_path: '/root/helper',
+      }),
+    ].join(''));
+    await writeSession(root, 'sessions/helper.jsonl', [
+      helperSessionMeta('example-child', 'example-parent'),
+      line('2026-09-11T10:01:01.000Z', 'turn_context', { model: 'codex-default', effort: 'default' }),
+      line('2026-09-11T10:01:10.000Z', 'token_usage_record', {
+        response_id: 'resp-helper-1',
+        thread_id: 'example-child',
+        session_id: 'example-parent',
+        usage: helperU,
+        thread_token_usage: helperU,
+      }),
+    ].join(''));
+    const report = await collectTrialUsage(baseManifest(caseRecord, {
+      sessions: [
+        { id: 'example-parent', role: 'parent', path: 'sessions/parent.jsonl' },
+        {
+          id: 'example-child',
+          role: 'native_helper',
+          path: 'sessions/helper.jsonl',
+          parent_id: 'example-parent',
+          agent_path: '/root/helper',
+        },
+      ],
+      phases: [
+        {
+          attempt_id: 'native-initial',
+          kind: 'initial',
+          outcome: 'completed_unaccepted',
+          sequence: 1,
+          start: '2026-09-11T10:00:00.000Z',
+          end: '2026-09-11T10:02:00.000Z',
+          session_id: 'example-parent',
+        },
+        {
+          attempt_id: 'native-helper',
+          kind: 'native_helper',
+          outcome: 'accepted',
+          sequence: 2,
+          start: '2026-09-11T10:01:00.000Z',
+          end: '2026-09-11T10:01:30.000Z',
+          session_id: 'example-child',
+        },
+      ],
+    }), { sessionsRoot: root });
+    assert.equal(report.status, 'complete');
+    assert.equal(report.trial.attempts[0].usage.native_output_tokens.value, 4);
+    assert.equal(report.trial.attempts[1].usage.native_output_tokens.value, 3);
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('normal CLI parent source string allows proven shared-session helper', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const parentU = usage(9, 0, 4, 1);
+    const helperU = usage(6, 0, 3, 1);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('example-parent', '2026-09-11T09:59:00.000Z', { source: 'cli' }),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default', effort: 'default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'resp-parent-1',
+        thread_id: 'example-parent',
+        session_id: 'example-parent',
+        usage: parentU,
+        thread_token_usage: parentU,
+      }),
+      line('2026-09-11T10:00:20.000Z', 'event_msg', {
+        type: 'sub_agent_activity',
+        kind: 'started',
+        agent_thread_id: 'example-child',
+        agent_path: '/root/helper',
+      }),
+    ].join(''));
+    await writeSession(root, 'sessions/helper.jsonl', [
+      helperSessionMeta('example-child', 'example-parent'),
+      line('2026-09-11T10:01:01.000Z', 'turn_context', { model: 'codex-default', effort: 'default' }),
+      line('2026-09-11T10:01:10.000Z', 'token_usage_record', {
+        response_id: 'resp-helper-1',
+        thread_id: 'example-child',
+        session_id: 'example-parent',
+        usage: helperU,
+        thread_token_usage: helperU,
+      }),
+    ].join(''));
+    const report = await collectTrialUsage(baseManifest(caseRecord, {
+      sessions: [
+        { id: 'example-parent', role: 'parent', path: 'sessions/parent.jsonl' },
+        {
+          id: 'example-child',
+          role: 'native_helper',
+          path: 'sessions/helper.jsonl',
+          parent_id: 'example-parent',
+          agent_path: '/root/helper',
+        },
+      ],
+      phases: [
+        {
+          attempt_id: 'native-initial',
+          kind: 'initial',
+          outcome: 'completed_unaccepted',
+          sequence: 1,
+          start: '2026-09-11T10:00:00.000Z',
+          end: '2026-09-11T10:02:00.000Z',
+          session_id: 'example-parent',
+        },
+        {
+          attempt_id: 'native-helper',
+          kind: 'native_helper',
+          outcome: 'accepted',
+          sequence: 2,
+          start: '2026-09-11T10:01:00.000Z',
+          end: '2026-09-11T10:01:30.000Z',
+          session_id: 'example-child',
+        },
+      ],
+    }), { sessionsRoot: root });
+    assert.equal(report.status, 'complete');
+    assert.equal(report.trial.attempts[0].usage.native_output_tokens.value, 4);
+    assert.equal(report.trial.attempts[1].usage.native_output_tokens.value, 3);
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('nested helper may share original root session_id across proven ancestry', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const parentU = usage(8, 0, 3, 1);
+    const midU = usage(5, 0, 2, 0);
+    const nestedU = usage(4, 0, 2, 1);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('example-parent'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default', effort: 'default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'resp-parent-1',
+        thread_id: 'example-parent',
+        session_id: 'example-parent',
+        usage: parentU,
+        thread_token_usage: parentU,
+      }),
+      line('2026-09-11T10:00:20.000Z', 'event_msg', {
+        type: 'sub_agent_activity',
+        kind: 'started',
+        agent_thread_id: 'example-mid',
+        agent_path: '/root/mid',
+      }),
+    ].join(''));
+    await writeSession(root, 'sessions/mid.jsonl', [
+      helperSessionMeta('example-mid', 'example-parent'),
+      line('2026-09-11T10:01:01.000Z', 'turn_context', { model: 'mid-model', effort: 'low' }),
+      line('2026-09-11T10:01:10.000Z', 'token_usage_record', {
+        response_id: 'resp-mid-1',
+        thread_id: 'example-mid',
+        session_id: 'example-parent',
+        usage: midU,
+        thread_token_usage: midU,
+      }),
+      line('2026-09-11T10:01:15.000Z', 'event_msg', {
+        type: 'sub_agent_activity',
+        kind: 'started',
+        agent_thread_id: 'example-child',
+        agent_path: '/root/nested',
+      }),
+    ].join(''));
+    await writeSession(root, 'sessions/nested.jsonl', [
+      helperSessionMeta('example-child', 'example-mid'),
+      line('2026-09-11T10:01:20.000Z', 'turn_context', { model: 'nested-model', effort: 'low' }),
+      line('2026-09-11T10:01:25.000Z', 'token_usage_record', {
+        response_id: 'resp-nested-1',
+        thread_id: 'example-child',
+        session_id: 'example-parent',
+        usage: nestedU,
+        thread_token_usage: nestedU,
+      }),
+    ].join(''));
+    const report = await collectTrialUsage(baseManifest(caseRecord, {
+      sessions: [
+        { id: 'example-parent', role: 'parent', path: 'sessions/parent.jsonl' },
+        {
+          id: 'example-mid',
+          role: 'native_helper',
+          path: 'sessions/mid.jsonl',
+          parent_id: 'example-parent',
+          agent_path: '/root/mid',
+          expected_model: 'mid-model',
+        },
+        {
+          id: 'example-child',
+          role: 'native_helper',
+          path: 'sessions/nested.jsonl',
+          parent_id: 'example-mid',
+          agent_path: '/root/nested',
+          expected_model: 'nested-model',
+        },
+      ],
+      phases: [
+        {
+          attempt_id: 'native-initial',
+          kind: 'initial',
+          outcome: 'completed_unaccepted',
+          sequence: 1,
+          start: '2026-09-11T10:00:00.000Z',
+          end: '2026-09-11T10:01:00.000Z',
+          session_id: 'example-parent',
+        },
+        {
+          attempt_id: 'native-mid',
+          kind: 'native_helper',
+          outcome: 'accepted',
+          sequence: 2,
+          start: '2026-09-11T10:01:00.000Z',
+          end: '2026-09-11T10:01:20.000Z',
+          session_id: 'example-mid',
+        },
+        {
+          attempt_id: 'native-nested',
+          kind: 'native_helper',
+          outcome: 'accepted',
+          sequence: 3,
+          start: '2026-09-11T10:01:20.000Z',
+          end: '2026-09-11T10:01:30.000Z',
+          session_id: 'example-child',
+        },
+      ],
+    }), { sessionsRoot: root });
+    assert.equal(report.status, 'complete');
+    assert.equal(report.trial.attempts[0].usage.native_output_tokens.value, 3);
+    assert.equal(report.trial.attempts[1].usage.native_output_tokens.value, 2);
+    assert.equal(report.trial.attempts[2].usage.native_output_tokens.value, 2);
+    assert.equal(report.breakdown.attempts[1].by_model[0].model, 'mid-model');
+    assert.equal(report.breakdown.attempts[2].by_model[0].model, 'nested-model');
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('shared session_id without parent linkage or with wrong ids is rejected', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const parentU = usage(4, 0, 2, 1);
+    const helperU = usage(3, 0, 1, 0);
+
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('example-parent'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'resp-parent-1',
+        usage: parentU,
+        thread_token_usage: parentU,
+      }),
+    ].join(''));
+
+    // Missing session_meta parent linkage while claiming shared session_id.
+    await writeSession(root, 'sessions/helper-unproven.jsonl', [
+      sessionMeta('example-child'),
+      line('2026-09-11T10:01:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:01:10.000Z', 'token_usage_record', {
+        response_id: 'resp-helper-1',
+        thread_id: 'example-child',
+        session_id: 'example-parent',
+        usage: helperU,
+        thread_token_usage: helperU,
+      }),
+    ].join(''));
+    await assert.rejects(
+      () => collectTrialUsage(baseManifest(caseRecord, {
+        sessions: [
+          { id: 'example-parent', role: 'parent', path: 'sessions/parent.jsonl' },
+          {
+            id: 'example-child',
+            role: 'native_helper',
+            path: 'sessions/helper-unproven.jsonl',
+            parent_id: 'example-parent',
+          },
+        ],
+        phases: [
+          {
+            attempt_id: 'native-initial',
+            kind: 'initial',
+            outcome: 'accepted',
+            sequence: 1,
+            start: '2026-09-11T10:00:00.000Z',
+            end: '2026-09-11T10:01:00.000Z',
+            session_id: 'example-parent',
+          },
+          {
+            attempt_id: 'native-helper',
+            kind: 'native_helper',
+            outcome: 'accepted',
+            sequence: 2,
+            start: '2026-09-11T10:01:00.000Z',
+            end: '2026-09-11T10:01:30.000Z',
+            session_id: 'example-child',
+          },
+        ],
+      }), { sessionsRoot: root }),
+      { code: 'identity_mismatch' },
+    );
+
+    // Unrelated session_id with otherwise valid parent linkage.
+    await writeSession(root, 'sessions/helper-wrong-session.jsonl', [
+      helperSessionMeta('example-child', 'example-parent'),
+      line('2026-09-11T10:01:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:01:10.000Z', 'token_usage_record', {
+        response_id: 'resp-helper-2',
+        thread_id: 'example-child',
+        session_id: 'unrelated-session',
+        usage: helperU,
+        thread_token_usage: helperU,
+      }),
+    ].join(''));
+    await assert.rejects(
+      () => collectTrialUsage(baseManifest(caseRecord, {
+        sessions: [
+          { id: 'example-parent', role: 'parent', path: 'sessions/parent.jsonl' },
+          {
+            id: 'example-child',
+            role: 'native_helper',
+            path: 'sessions/helper-wrong-session.jsonl',
+            parent_id: 'example-parent',
+          },
+        ],
+        phases: [
+          {
+            attempt_id: 'native-initial',
+            kind: 'initial',
+            outcome: 'accepted',
+            sequence: 1,
+            start: '2026-09-11T10:00:00.000Z',
+            end: '2026-09-11T10:01:00.000Z',
+            session_id: 'example-parent',
+          },
+          {
+            attempt_id: 'native-helper',
+            kind: 'native_helper',
+            outcome: 'accepted',
+            sequence: 2,
+            start: '2026-09-11T10:01:00.000Z',
+            end: '2026-09-11T10:01:30.000Z',
+            session_id: 'example-child',
+          },
+        ],
+      }), { sessionsRoot: root }),
+      { code: 'identity_mismatch' },
+    );
+
+    // Parent thread_id used as child usage thread_id.
+    await writeSession(root, 'sessions/helper-parent-thread.jsonl', [
+      helperSessionMeta('example-child', 'example-parent'),
+      line('2026-09-11T10:01:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:01:10.000Z', 'token_usage_record', {
+        response_id: 'resp-helper-3',
+        thread_id: 'example-parent',
+        session_id: 'example-parent',
+        usage: helperU,
+        thread_token_usage: helperU,
+      }),
+    ].join(''));
+    await assert.rejects(
+      () => collectTrialUsage(baseManifest(caseRecord, {
+        sessions: [
+          { id: 'example-parent', role: 'parent', path: 'sessions/parent.jsonl' },
+          {
+            id: 'example-child',
+            role: 'native_helper',
+            path: 'sessions/helper-parent-thread.jsonl',
+            parent_id: 'example-parent',
+          },
+        ],
+        phases: [
+          {
+            attempt_id: 'native-initial',
+            kind: 'initial',
+            outcome: 'accepted',
+            sequence: 1,
+            start: '2026-09-11T10:00:00.000Z',
+            end: '2026-09-11T10:01:00.000Z',
+            session_id: 'example-parent',
+          },
+          {
+            attempt_id: 'native-helper',
+            kind: 'native_helper',
+            outcome: 'accepted',
+            sequence: 2,
+            start: '2026-09-11T10:01:00.000Z',
+            end: '2026-09-11T10:01:30.000Z',
+            session_id: 'example-child',
+          },
+        ],
+      }), { sessionsRoot: root }),
+      { code: 'identity_mismatch' },
+    );
+
+    // Conflicting parent metadata vs manifest parent_id.
+    await writeSession(root, 'sessions/helper-conflict.jsonl', [
+      helperSessionMeta('example-child', 'not-the-manifest-parent'),
+      line('2026-09-11T10:01:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:01:10.000Z', 'token_usage_record', {
+        response_id: 'resp-helper-4',
+        thread_id: 'example-child',
+        session_id: 'example-child',
+        usage: helperU,
+        thread_token_usage: helperU,
+      }),
+    ].join(''));
+    await assert.rejects(
+      () => collectTrialUsage(baseManifest(caseRecord, {
+        sessions: [
+          { id: 'example-parent', role: 'parent', path: 'sessions/parent.jsonl' },
+          {
+            id: 'example-child',
+            role: 'native_helper',
+            path: 'sessions/helper-conflict.jsonl',
+            parent_id: 'example-parent',
+          },
+        ],
+        phases: [
+          {
+            attempt_id: 'native-initial',
+            kind: 'initial',
+            outcome: 'accepted',
+            sequence: 1,
+            start: '2026-09-11T10:00:00.000Z',
+            end: '2026-09-11T10:01:00.000Z',
+            session_id: 'example-parent',
+          },
+          {
+            attempt_id: 'native-helper',
+            kind: 'native_helper',
+            outcome: 'accepted',
+            sequence: 2,
+            start: '2026-09-11T10:01:00.000Z',
+            end: '2026-09-11T10:01:30.000Z',
+            session_id: 'example-child',
+          },
+        ],
+      }), { sessionsRoot: root }),
+      { code: 'identity_mismatch' },
+    );
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('nested helper claiming root session_id without full ancestry proof is rejected', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const caseRecord = cases.find((entry) => entry.id === 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-host-usage-'));
+  try {
+    const parentU = usage(4, 0, 2, 1);
+    const midU = usage(3, 0, 1, 0);
+    const nestedU = usage(2, 0, 1, 0);
+    await writeSession(root, 'sessions/parent.jsonl', [
+      sessionMeta('example-parent'),
+      line('2026-09-11T10:00:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:00:10.000Z', 'token_usage_record', {
+        response_id: 'resp-parent-1',
+        usage: parentU,
+        thread_token_usage: parentU,
+      }),
+    ].join(''));
+    // Mid helper lacks parent_thread_id, so nested cannot prove root ancestry.
+    await writeSession(root, 'sessions/mid.jsonl', [
+      sessionMeta('example-mid'),
+      line('2026-09-11T10:01:01.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:01:10.000Z', 'token_usage_record', {
+        response_id: 'resp-mid-1',
+        thread_id: 'example-mid',
+        session_id: 'example-mid',
+        usage: midU,
+        thread_token_usage: midU,
+      }),
+    ].join(''));
+    await writeSession(root, 'sessions/nested.jsonl', [
+      helperSessionMeta('example-child', 'example-mid'),
+      line('2026-09-11T10:01:20.000Z', 'turn_context', { model: 'codex-default' }),
+      line('2026-09-11T10:01:25.000Z', 'token_usage_record', {
+        response_id: 'resp-nested-1',
+        thread_id: 'example-child',
+        session_id: 'example-parent',
+        usage: nestedU,
+        thread_token_usage: nestedU,
+      }),
+    ].join(''));
+    await assert.rejects(
+      () => collectTrialUsage(baseManifest(caseRecord, {
+        sessions: [
+          { id: 'example-parent', role: 'parent', path: 'sessions/parent.jsonl' },
+          {
+            id: 'example-mid',
+            role: 'native_helper',
+            path: 'sessions/mid.jsonl',
+            parent_id: 'example-parent',
+          },
+          {
+            id: 'example-child',
+            role: 'native_helper',
+            path: 'sessions/nested.jsonl',
+            parent_id: 'example-mid',
+          },
+        ],
+        phases: [
+          {
+            attempt_id: 'native-initial',
+            kind: 'initial',
+            outcome: 'accepted',
+            sequence: 1,
+            start: '2026-09-11T10:00:00.000Z',
+            end: '2026-09-11T10:01:00.000Z',
+            session_id: 'example-parent',
+          },
+          {
+            attempt_id: 'native-mid',
+            kind: 'native_helper',
+            outcome: 'accepted',
+            sequence: 2,
+            start: '2026-09-11T10:01:00.000Z',
+            end: '2026-09-11T10:01:20.000Z',
+            session_id: 'example-mid',
+          },
+          {
+            attempt_id: 'native-nested',
+            kind: 'native_helper',
+            outcome: 'accepted',
+            sequence: 3,
+            start: '2026-09-11T10:01:20.000Z',
+            end: '2026-09-11T10:01:30.000Z',
+            session_id: 'example-child',
+          },
+        ],
+      }), { sessionsRoot: root }),
+      { code: 'identity_mismatch' },
+    );
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
diff --git a/scripts/compare-coengineer-runs.mjs b/scripts/compare-coengineer-runs.mjs
new file mode 100644
index 0000000..c1b9a6d
--- /dev/null
+++ b/scripts/compare-coengineer-runs.mjs
@@ -0,0 +1,1085 @@
+#!/usr/bin/env node
+// Offline comparison of sanitized Co-Engineer trial records against frozen
+// benchmark cases. Live provider jobs are not implemented. Paid repeated
+// trials remain opt-in and must not run from CI.
+
+import { execFile as execFileCallback } from 'node:child_process';
+import { createHash } from 'node:crypto';
+import {
+  mkdir,
+  readdir,
+  readFile,
+  stat,
+  writeFile,
+} from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { promisify } from 'node:util';
+
+import { canonicalJsonStringify } from '../plugins/codex-co-engineer/mcp/v3/identity.mjs';
+
+const execFile = promisify(execFileCallback);
+
+export const PROTOCOL_SCHEMA_ID = 'codex-co-engineer.benchmark-protocol.v1';
+export const CASE_SCHEMA_ID = 'codex-co-engineer.benchmark-case.v1';
+export const TRIAL_SCHEMA_ID = 'codex-co-engineer.benchmark-trial.v1';
+export const TRIALS_SCHEMA_ID = 'codex-co-engineer.benchmark-trials.v1';
+export const COMPARISON_SCHEMA_ID = 'codex-co-engineer.benchmark-comparison.v1';
+export const REQUIRED_ARMS = Object.freeze(['native-codex', 'published-3.4.2', 'candidate-3.4.3']);
+export const OPTIONAL_ARMS = Object.freeze(['direct-delegation']);
+export const ALL_ARMS = Object.freeze([...REQUIRED_ARMS, ...OPTIONAL_ARMS]);
+export const COENGINEER_ARMS = Object.freeze(['published-3.4.2', 'candidate-3.4.3', 'direct-delegation']);
+export const ATTEMPT_KINDS = Object.freeze(['initial', 'correction', 'native_helper']);
+export const ATTEMPT_OUTCOMES = Object.freeze([
+  'accepted', 'completed_unaccepted', 'failed', 'uncertain', 'unfinal',
+]);
+export const TERMINAL_OUTCOMES = Object.freeze(['accepted', 'completed_unaccepted', 'failed']);
+export const METRIC_KEYS = Object.freeze([
+  'native_input_tokens', 'native_output_tokens', 'native_helper_calls',
+  'correction_rounds', 'elapsed_ms', 'provider_input_tokens', 'provider_output_tokens',
+  'provider_cost_millicents', 'model_facing_bytes', 'evidence_bytes',
+]);
+export const BYTE_METRICS = Object.freeze(['model_facing_bytes', 'evidence_bytes']);
+export const PROVIDER_METRICS = Object.freeze([
+  'provider_input_tokens', 'provider_output_tokens', 'provider_cost_millicents',
+]);
+export const USAGE_SOURCES = Object.freeze(['evidence_bytes', 'host_measured', 'provider_report', 'unknown']);
+export const USAGE_TRUST = Object.freeze(['host_authoritative', 'provider_untrusted', 'unknown']);
+export const SOURCE_TRUST = Object.freeze({
+  host_measured: 'host_authoritative',
+  provider_report: 'provider_untrusted',
+  evidence_bytes: 'host_authoritative',
+  unknown: 'unknown',
+});
+export const PROVENANCE_CLASSES = Object.freeze([
+  'synthetic_unverified',
+  'operator_supplied_unverified',
+]);
+export const COENGINEER_SOURCE_KINDS = Object.freeze(['git_commit', 'synthetic_label', 'native']);
+export const CASE_GIT_IDENTITY = Object.freeze({
+  name: 'Co-Engineer Benchmark',
+  email: 'benchmark@invalid',
+  date: '2026-01-01T00:00:00+0000',
+});
+export const GIT_EXECUTABLE = '/usr/bin/git';
+export const INPUT_DIGEST_DOMAIN = 'codex-co-engineer.benchmark-input.v1';
+
+const SHA40 = /^[0-9a-f]{40}$/u;
+const SHA256 = /^[0-9a-f]{64}$/u;
+const ID_PATTERN = /^[a-z][a-z0-9-]{1,63}$/u;
+const PATH_SEGMENT = /^[A-Za-z0-9][A-Za-z0-9._-]{0,63}$/u;
+const SYNTHETIC_LABEL = /^fixture:[a-z0-9.-]{1,64}$/u;
+const PROVIDER_ID = /^[a-z][a-z0-9-]{0,63}$/u;
+const MODEL_ID = /^[A-Za-z0-9][A-Za-z0-9._/:-]{0,127}$/u;
+const MAX_ATTEMPTS = 32;
+const MAX_TRIALS = 256;
+const MAX_CASES = 32;
+const MAX_CASE_FILES = 16;
+const MAX_PATH_SEGMENTS = 4;
+const MAX_FILE_BYTES = 16_384;
+const MAX_CASE_JSON_BYTES = 131_072;
+const MAX_TRIALS_JSON_BYTES = 1_048_576;
+const MAX_PROTOCOL_JSON_BYTES = 65_536;
+const GIT_TIMEOUT_MS = 10_000;
+const BOOLEAN_FLAGS = Object.freeze(['--help', '--live']);
+const VALUE_FLAGS = Object.freeze([
+  '--cases', '--trials', '--protocol', '--validate-cases',
+  '--materialize-case', '--destination', '--paid-budget',
+]);
+
+function fail(code, message) {
+  const error = new Error(message);
+  error.code = code;
+  throw error;
+}
+
+function isPlainObject(value) {
+  return value !== null && typeof value === 'object' && !Array.isArray(value);
+}
+
+function assertPlain(value, pathLabel) {
+  if (!isPlainObject(value)) fail('invalid_type', `${pathLabel} must be a JSON object.`);
+  return value;
+}
+
+function ownString(object, key, pathLabel, pattern = null) {
+  const value = object[key];
+  if (typeof value !== 'string' || value.length === 0) {
+    fail('invalid_format', `${pathLabel}.${key} must be a non-empty string.`);
+  }
+  if (pattern && !pattern.test(value)) {
+    fail('invalid_format', `${pathLabel}.${key} is not an allowed identifier.`);
+  }
+  return value;
+}
+
+function ownBoolean(object, key, pathLabel) {
+  const value = object[key];
+  if (value !== true && value !== false) fail('invalid_type', `${pathLabel}.${key} must be a boolean.`);
+  return value;
+}
+
+function ownInteger(object, key, pathLabel, min, max) {
+  const value = object[key];
+  if (!Number.isSafeInteger(value) || value < min || value > max) {
+    fail('out_of_range', `${pathLabel}.${key} must be a safe integer in ${min}..${max}.`);
+  }
+  return value;
+}
+
+function metricUnit(key) {
+  if (BYTE_METRICS.includes(key)) return 'bytes';
+  if (key === 'elapsed_ms' || key === 'wall_elapsed_ms' || key === 'attempt_elapsed_ms') {
+    return 'milliseconds';
+  }
+  if (key === 'provider_cost_millicents') return 'millicents';
+  if (key.endsWith('_tokens')) return 'tokens';
+  return 'count';
+}
+
+function metricSourceExpected(key) {
+  if (PROVIDER_METRICS.includes(key)) return 'provider_report';
+  if (key === 'evidence_bytes') return 'evidence_bytes';
+  return 'host_measured';
+}
+
+export function parseUsageMetric(value, pathLabel, key) {
+  if (value == null) {
+    return { value: null, source: 'unknown', trust: 'unknown', unit: metricUnit(key) };
+  }
+  const metric = assertPlain(value, pathLabel);
+  const source = metric.source;
+  const trust = metric.trust;
+  if (!USAGE_SOURCES.includes(source) || !USAGE_TRUST.includes(trust)) {
+    fail('invalid_format', `${pathLabel} has an unknown source or trust.`);
+  }
+  if (SOURCE_TRUST[source] !== trust) {
+    fail('identity_mismatch', `${pathLabel} source/trust pair is not allowed.`);
+  }
+  if (metric.value === null) {
+    if (source !== 'unknown' || trust !== 'unknown') {
+      fail('identity_mismatch', `${pathLabel} unknown usage must not hide a recorded value.`);
+    }
+    return { value: null, source: 'unknown', trust: 'unknown', unit: metricUnit(key) };
+  }
+  if (!Number.isSafeInteger(metric.value) || metric.value < 0) {
+    fail('out_of_range', `${pathLabel}.value must be a non-negative safe integer.`);
+  }
+  if (source === 'unknown' || trust === 'unknown') {
+    fail('identity_mismatch', `${pathLabel} recorded values cannot be marked unknown.`);
+  }
+  const expected = metricSourceExpected(key);
+  if (source !== expected) {
+    fail('forged_provider_usage', `${pathLabel} mixes provider-reported and host-measured authority.`);
+  }
+  return { value: metric.value, source, trust, unit: metricUnit(key) };
+}
+
+function parseAttemptUsage(value, pathLabel) {
+  const usage = value == null ? {} : assertPlain(value, pathLabel);
+  const parsed = {};
+  for (const key of Object.keys(usage)) {
+    if (!METRIC_KEYS.includes(key)) fail('unknown_key', `${pathLabel}.${key}`);
+  }
+  for (const key of METRIC_KEYS) {
+    parsed[key] = parseUsageMetric(usage[key], `${pathLabel}.${key}`, key);
+  }
+  return parsed;
+}
+
+function parseProviderAttribution(attempt, usage, pathLabel) {
+  const recorded = PROVIDER_METRICS.some((key) => usage[key].value !== null);
+  if (!recorded) {
+    return { provider: null, model: null };
+  }
+  const provider = ownString(attempt, 'provider', pathLabel, PROVIDER_ID);
+  const model = ownString(attempt, 'model', pathLabel, MODEL_ID);
+  return { provider, model };
+}
+
+function parseAttempt(value, pathLabel, index) {
+  const attempt = assertPlain(value, pathLabel);
+  const kind = ownString(attempt, 'kind', pathLabel);
+  if (!ATTEMPT_KINDS.includes(kind)) fail('invalid_format', `${pathLabel}.kind`);
+  const outcome = ownString(attempt, 'outcome', pathLabel);
+  if (!ATTEMPT_OUTCOMES.includes(outcome)) fail('invalid_format', `${pathLabel}.outcome`);
+  const usage = parseAttemptUsage(attempt.usage, `${pathLabel}.usage`);
+  const attribution = parseProviderAttribution(attempt, usage, pathLabel);
+  const sequence = Object.hasOwn(attempt, 'sequence')
+    ? ownInteger(attempt, 'sequence', pathLabel, 1, MAX_ATTEMPTS)
+    : index + 1;
+  return {
+    attempt_id: ownString(attempt, 'attempt_id', pathLabel, ID_PATTERN),
+    kind,
+    outcome,
+    sequence,
+    provider: attribution.provider,
+    model: attribution.model,
+    usage,
+  };
+}
+
+function monotoneOrEqual(previous, next) {
+  for (const key of METRIC_KEYS) {
+    const left = previous.usage[key];
+    const right = next.usage[key];
+    if (left.source === 'unknown' && right.source === 'unknown') continue;
+    if (left.source === 'unknown' && right.source !== 'unknown') continue;
+    if (left.source !== 'unknown' && right.source === 'unknown') return false;
+    if (left.source !== right.source || left.trust !== right.trust) return false;
+    if (right.value < left.value) return false;
+  }
+  return true;
+}
+
+function compatibleSnapshot(previous, next) {
+  if (previous.kind !== next.kind) return false;
+  if (previous.provider !== null && (previous.provider !== next.provider || previous.model !== next.model)) return false;
+  if (next.sequence <= previous.sequence) return false;
+  if (TERMINAL_OUTCOMES.includes(previous.outcome) && previous.outcome !== next.outcome) {
+    return false;
+  }
+  return monotoneOrEqual(previous, next);
+}
+
+function dedupeAttempts(attempts, pathLabel) {
+  const latest = new Map();
+  const replaced = [];
+  for (const attempt of attempts) {
+    const previous = latest.get(attempt.attempt_id);
+    if (!previous) {
+      latest.set(attempt.attempt_id, attempt);
+      continue;
+    }
+    if (!compatibleSnapshot(previous, attempt)) {
+      fail(
+        'incompatible_snapshot',
+        `${pathLabel} duplicate attempt_id ${attempt.attempt_id} is not a compatible cumulative snapshot.`,
+      );
+    }
+    latest.set(attempt.attempt_id, attempt);
+    replaced.push(attempt.attempt_id);
+  }
+  return { attempts: [...latest.values()], cumulative_replaced: replaced };
+}
+
+function parseCoengineerSource(value, pathLabel, arm) {
+  if (value == null) {
+    fail('missing_key', `${pathLabel} must record coengineer_source identity.`);
+  }
+  const source = assertPlain(value, pathLabel);
+  const kind = ownString(source, 'kind', pathLabel);
+  const recorded = ownString(source, 'value', pathLabel);
+  if (!COENGINEER_SOURCE_KINDS.includes(kind)) {
+    fail('invalid_format', `${pathLabel}.kind`);
+  }
+  if (COENGINEER_ARMS.includes(arm)) {
+    if (kind === 'native') {
+      fail('identity_mismatch', `${pathLabel} Co-Engineer arms cannot use native identity.`);
+    }
+    if (kind === 'git_commit' && !SHA40.test(recorded)) {
+      fail('invalid_format', `${pathLabel}.value must be a 40-character commit SHA.`);
+    }
+    if (kind === 'synthetic_label' && !SYNTHETIC_LABEL.test(recorded)) {
+      fail('invalid_format', `${pathLabel}.value must be a fixture: label.`);
+    }
+  } else if (kind !== 'native' || recorded !== 'native-codex') {
+    fail('identity_mismatch', `${pathLabel} native arm identity must be native:native-codex.`);
+  }
+  return { kind, value: recorded, key: `${kind}:${recorded}` };
+}
+
+export function parseTrial(value, pathLabel = 'trial') {
+  const trial = assertPlain(value, pathLabel);
+  if (trial.schema !== TRIAL_SCHEMA_ID) fail('invalid_format', `${pathLabel}.schema`);
+  const arm = ownString(trial, 'arm', pathLabel);
+  if (!ALL_ARMS.includes(arm)) fail('invalid_format', `${pathLabel}.arm`);
+  const attemptsInput = trial.attempts;
+  if (!Array.isArray(attemptsInput) || attemptsInput.length < 1 || attemptsInput.length > MAX_ATTEMPTS) {
+    fail('bounds_exceeded', `${pathLabel}.attempts`);
+  }
+  const parsedAttempts = attemptsInput.map((entry, index) => (
+    parseAttempt(entry, `${pathLabel}.attempts[${index}]`, index)
+  ));
+  const deduped = dedupeAttempts(parsedAttempts, pathLabel);
+  const accepted = Object.hasOwn(trial, 'accepted') ? ownBoolean(trial, 'accepted', pathLabel) : null;
+  const hasHelpers = deduped.attempts.some((attempt) => attempt.kind === 'native_helper');
+  const hasParent = deduped.attempts.some((attempt) => attempt.kind !== 'native_helper');
+  let nativeParentExcludesHelpers = false;
+  if (hasHelpers && hasParent) {
+    if (trial.native_parent_excludes_helpers !== true) {
+      fail(
+        'identity_mismatch',
+        `${pathLabel} native parent usage must explicitly exclude separately recorded helpers.`,
+      );
+    }
+    nativeParentExcludesHelpers = true;
+  } else if (Object.hasOwn(trial, 'native_parent_excludes_helpers')) {
+    nativeParentExcludesHelpers = ownBoolean(trial, 'native_parent_excludes_helpers', pathLabel);
+  }
+  return {
+    schema: TRIAL_SCHEMA_ID,
+    trial_id: ownString(trial, 'trial_id', pathLabel, ID_PATTERN),
+    case_id: ownString(trial, 'case_id', pathLabel, ID_PATTERN),
+    arm,
+    base_sha: ownString(trial, 'base_sha', pathLabel, SHA40),
+    input_digest: ownString(trial, 'input_digest', pathLabel, SHA256),
+    coengineer_source: parseCoengineerSource(
+      trial.coengineer_source,
+      `${pathLabel}.coengineer_source`,
+      arm,
+    ),
+    host_model: ownString(trial, 'host_model', pathLabel),
+    host_settings: assertPlain(trial.host_settings, `${pathLabel}.host_settings`),
+    provider_configuration: assertPlain(
+      trial.provider_configuration,
+      `${pathLabel}.provider_configuration`,
+    ),
+    accepted,
+    wall_elapsed_ms: parseUsageMetric(trial.wall_elapsed_ms, `${pathLabel}.wall_elapsed_ms`, 'elapsed_ms'),
+    native_parent_excludes_helpers: nativeParentExcludesHelpers,
+    attempts: deduped.attempts,
+    cumulative_replaced: deduped.cumulative_replaced,
+  };
+}
+
+export function assertSafeRelativePath(rel, pathLabel) {
+  if (typeof rel !== 'string' || rel.length === 0 || rel.length > 200) {
+    fail('invalid_format', `${pathLabel} is not a safe relative path.`);
+  }
+  if (rel.startsWith('/') || rel.includes('\\') || rel.includes('\0')) {
+    fail('invalid_format', `${pathLabel} is not a safe relative path.`);
+  }
+  const parts = rel.split('/');
+  if (parts.length > MAX_PATH_SEGMENTS) {
+    fail('bounds_exceeded', `${pathLabel} exceeds ${MAX_PATH_SEGMENTS} path segments.`);
+  }
+  for (const part of parts) {
+    if (part === '.' || part === '..' || part === '.git' || !PATH_SEGMENT.test(part)) {
+      fail('invalid_format', `${pathLabel} is not a safe relative path.`);
+    }
+  }
+  return rel;
+}
+
+function parseFiles(value, pathLabel) {
+  const files = assertPlain(value, pathLabel);
+  const keys = Object.keys(files);
+  if (keys.length < 1 || keys.length > MAX_CASE_FILES) {
+    fail('bounds_exceeded', `${pathLabel} must contain 1..${MAX_CASE_FILES} files.`);
+  }
+  const parsed = {};
+  for (const key of keys) {
+    assertSafeRelativePath(key, `${pathLabel}.${key}`);
+    const text = files[key];
+    if (typeof text !== 'string') fail('invalid_type', `${pathLabel}.${key} must be a string.`);
+    if (Buffer.byteLength(text, 'utf8') > MAX_FILE_BYTES) {
+      fail('bounds_exceeded', `${pathLabel}.${key} exceeds ${MAX_FILE_BYTES} bytes.`);
+    }
+    parsed[key] = text;
+  }
+  return parsed;
+}
+
+function parseAcceptance(value, pathLabel) {
+  const acceptance = assertPlain(value, pathLabel);
+  const checks = acceptance.checks;
+  if (!Array.isArray(checks) || checks.length < 1 || checks.length > 16) {
+    fail('bounds_exceeded', `${pathLabel}.checks`);
+  }
+  for (let index = 0; index < checks.length; index += 1) {
+    const check = assertPlain(checks[index], `${pathLabel}.checks[${index}]`);
+    ownString(check, 'id', `${pathLabel}.checks[${index}]`, ID_PATTERN);
+    if (Object.hasOwn(check, 'command')) {
+      const command = check.command;
+      if (!Array.isArray(command) || command.length < 1 || command.some((part) => typeof part !== 'string')) {
+        fail('invalid_format', `${pathLabel}.checks[${index}].command must be a frozen argv array.`);
+      }
+    }
+  }
+  return acceptance;
+}
+
+export function computeInputDigest(files, acceptance) {
+  const canonical = canonicalJsonStringify({ files, acceptance });
+  return createHash('sha256')
+    .update(INPUT_DIGEST_DOMAIN, 'utf8')
+    .update('\n', 'utf8')
+    .update(canonical, 'utf8')
+    .digest('hex');
+}
+
+export function parseCase(value, pathLabel = 'case') {
+  const record = assertPlain(value, pathLabel);
+  if (record.schema !== CASE_SCHEMA_ID) fail('invalid_format', `${pathLabel}.schema`);
+  const comparable = assertPlain(record.comparable, `${pathLabel}.comparable`);
+  const inputs = assertPlain(record.inputs, `${pathLabel}.inputs`);
+  const files = parseFiles(inputs.files, `${pathLabel}.inputs.files`);
+  const acceptance = parseAcceptance(record.acceptance, `${pathLabel}.acceptance`);
+  const inputDigest = computeInputDigest(files, acceptance);
+  if (Object.hasOwn(record, 'input_digest')) {
+    const claimed = ownString(record, 'input_digest', pathLabel, SHA256);
+    if (claimed !== inputDigest) {
+      fail('identity_mismatch', `${pathLabel}.input_digest does not match frozen files and acceptance checks.`);
+    }
+  }
+  let baseSha = null;
+  if (Object.hasOwn(record, 'base_sha') && record.base_sha != null) {
+    baseSha = ownString(record, 'base_sha', pathLabel, SHA40);
+  }
+  return {
+    schema: CASE_SCHEMA_ID,
+    id: ownString(record, 'id', pathLabel, ID_PATTERN),
+    title: ownString(record, 'title', pathLabel),
+    summary: ownString(record, 'summary', pathLabel),
+    base_sha: baseSha,
+    input_digest: inputDigest,
+    comparable: {
+      host_model: ownString(comparable, 'host_model', `${pathLabel}.comparable`),
+      host_settings: assertPlain(comparable.host_settings, `${pathLabel}.comparable.host_settings`),
+      provider_configuration: assertPlain(
+        comparable.provider_configuration,
+        `${pathLabel}.comparable.provider_configuration`,
+      ),
+    },
+    inputs: { files },
+    acceptance,
+  };
+}
+
+function settingsDigest(settings) {
+  return canonicalJsonStringify(settings);
+}
+
+function comparableMatch(trial, caseRecord) {
+  if (trial.case_id !== caseRecord.id) return 'case_mismatch';
+  if (trial.input_digest !== caseRecord.input_digest) return 'input_digest_mismatch';
+  if (caseRecord.base_sha != null && trial.base_sha !== caseRecord.base_sha) return 'base_sha_mismatch';
+  if (trial.host_model !== caseRecord.comparable.host_model) return 'host_model_mismatch';
+  if (settingsDigest(trial.host_settings) !== settingsDigest(caseRecord.comparable.host_settings)) {
+    return 'host_settings_mismatch';
+  }
+  if (COENGINEER_ARMS.includes(trial.arm)) {
+    if (settingsDigest(trial.provider_configuration)
+      !== settingsDigest(caseRecord.comparable.provider_configuration)) {
+      return 'provider_configuration_mismatch';
+    }
+  }
+  return null;
+}
+
+function emptyMetric() {
+  return {
+    value: null,
+    source: 'unknown',
+    trust: 'unknown',
+    reported_sum: null,
+    reported_count: 0,
+    unknown_count: 0,
+    unit: null,
+  };
+}
+
+function rollupMetric(rows, key) {
+  const result = emptyMetric();
+  result.unit = metricUnit(key);
+  let source = null;
+  let trust = null;
+  for (const row of rows) {
+    if (row.source === 'unknown' || row.value === null) {
+      result.unknown_count += 1;
+      continue;
+    }
+    if (source === null) {
+      source = row.source;
+      trust = row.trust;
+    } else if (source !== row.source || trust !== row.trust) {
+      result.unknown_count += 1;
+      continue;
+    }
+    result.reported_count += 1;
+    result.reported_sum = result.reported_sum == null ? row.value : result.reported_sum + row.value;
+  }
+  const complete = result.unknown_count === 0 && result.reported_count > 0;
+  if (complete) {
+    result.value = result.reported_sum;
+    result.source = source;
+    result.trust = trust;
+  }
+  return result;
+}
+
+function attributionKey(attempt) {
+  if (attempt.provider == null || attempt.model == null) return 'unattributed';
+  return `${attempt.provider}\n${attempt.model}`;
+}
+
+function rollupProviderMetric(attempts, key) {
+  const result = rollupMetric(attempts.map((attempt) => attempt.usage[key]), key);
+  const groups = new Map();
+  for (const attempt of attempts) {
+    const metric = attempt.usage[key];
+    if (metric.source === 'unknown' || metric.value === null) continue;
+    if (attempt.provider == null || attempt.model == null) continue;
+    const mapKey = attributionKey(attempt);
+    const current = groups.get(mapKey) ?? {
+      provider: attempt.provider,
+      model: attempt.model,
+      value: 0,
+      source: metric.source,
+      trust: metric.trust,
+      unit: metric.unit,
+    };
+    current.value += metric.value;
+    groups.set(mapKey, current);
+  }
+  result.groups = [...groups.values()].sort((left, right) => {
+    if (left.provider === right.provider) return left.model.localeCompare(right.model);
+    return left.provider.localeCompare(right.provider);
+  });
+  if (result.groups.length > 1) {
+    result.value = null;
+    result.source = 'unknown';
+    result.trust = 'unknown';
+    result.reason = 'mixed_providers_non_comparable';
+  }
+  return result;
+}
+
+function usagePerAccepted(metric, context) {
+  const coverage = {
+    accepted_known: context.acceptedKnown,
+    accepted_count: context.acceptedCount,
+    trial_count: context.trialCount,
+    metric_reported: metric.reported_count,
+    metric_unknown: metric.unknown_count,
+  };
+  if (context.acceptanceComplete !== true) {
+    return {
+      value: null,
+      source: 'unknown',
+      trust: 'unknown',
+      reason: 'incomplete_acceptance_coverage',
+      numerator: metric.value,
+      known_accepted_count: context.acceptedCount,
+      coverage,
+      unit: metric.unit,
+    };
+  }
+  if (context.acceptedCount === 0) {
+    return {
+      value: null,
+      source: 'unknown',
+      trust: 'unknown',
+      reason: 'zero_accepted_not_zero_cost',
+      numerator: metric.value,
+      known_accepted_count: 0,
+      coverage,
+      unit: metric.unit,
+    };
+  }
+  if (metric.value === null || metric.source === 'unknown') {
+    return {
+      value: null,
+      source: 'unknown',
+      trust: 'unknown',
+      reason: 'unknown_metric',
+      numerator: metric.value,
+      known_accepted_count: context.acceptedCount,
+      coverage,
+      unit: metric.unit,
+    };
+  }
+  return {
+    value: metric.value / context.acceptedCount,
+    source: metric.source,
+    trust: metric.trust,
+    reason: 'includes_failed_attempts_and_corrections',
+    numerator: metric.value,
+    known_accepted_count: context.acceptedCount,
+    coverage,
+    unit: metric.unit,
+  };
+}
+
+export function aggregateTrials(trials) {
+  const attemptRows = [];
+  let acceptedCount = 0;
+  let acceptedKnown = 0;
+  let failedAttempts = 0;
+  let corrections = 0;
+  let nativeHelpers = 0;
+  for (const trial of trials) {
+    if (trial.accepted === true) acceptedCount += 1;
+    if (trial.accepted === true || trial.accepted === false) acceptedKnown += 1;
+    for (const attempt of trial.attempts) {
+      attemptRows.push(attempt);
+      if (attempt.outcome === 'failed') failedAttempts += 1;
+      if (attempt.kind === 'correction') corrections += 1;
+      if (attempt.kind === 'native_helper') nativeHelpers += 1;
+    }
+  }
+  const acceptanceComplete = trials.length > 0 && acceptedKnown === trials.length;
+  const perAcceptedContext = {
+    acceptedCount,
+    acceptedKnown,
+    trialCount: trials.length,
+    acceptanceComplete,
+  };
+  const metrics = {};
+  const perAccepted = {};
+  for (const key of METRIC_KEYS) {
+    const rolled = PROVIDER_METRICS.includes(key)
+      ? rollupProviderMetric(attemptRows, key)
+      : rollupMetric(attemptRows.map((attempt) => attempt.usage[key]), key);
+    if (key === 'elapsed_ms') {
+      rolled.role = 'attempt_duration_sum';
+    }
+    metrics[key] = rolled;
+    perAccepted[key] = usagePerAccepted(rolled, perAcceptedContext);
+  }
+  const wall = rollupMetric(trials.map((trial) => trial.wall_elapsed_ms), 'wall_elapsed_ms');
+  wall.role = 'trial_wall_elapsed';
+  metrics.wall_elapsed_ms = wall;
+  perAccepted.wall_elapsed_ms = usagePerAccepted(wall, perAcceptedContext);
+  const acceptanceCoverage = trials.length === 0 ? 0 : acceptedKnown / trials.length;
+  const acceptanceRate = acceptanceComplete
+    ? { value: acceptedCount / trials.length, coverage: 1 }
+    : { value: null, coverage: acceptanceCoverage, reason: 'missing_acceptance' };
+  return {
+    trial_count: trials.length,
+    accepted_count: acceptedCount,
+    accepted_known_count: acceptedKnown,
+    failed_attempt_count: failedAttempts,
+    correction_count: corrections,
+    native_helper_count: nativeHelpers,
+    acceptance_rate: acceptanceRate,
+    usage: metrics,
+    usage_per_accepted_result: perAccepted,
+  };
+}
+
+function parseProvenance(value, pathLabel = 'provenance') {
+  if (value == null) {
+    return {
+      class: 'synthetic_unverified',
+      independently_verified: false,
+      paid_live_jobs: false,
+    };
+  }
+  const provenance = assertPlain(value, pathLabel);
+  const recordedClass = ownString(provenance, 'class', pathLabel);
+  if (!PROVENANCE_CLASSES.includes(recordedClass)) {
+    fail('invalid_format', `${pathLabel}.class`);
+  }
+  const independentlyVerified = Object.hasOwn(provenance, 'independently_verified')
+    ? ownBoolean(provenance, 'independently_verified', pathLabel)
+    : false;
+  if (independentlyVerified === true) {
+    fail(
+      'identity_mismatch',
+      `${pathLabel} this command does not independently verify supplied measurements.`,
+    );
+  }
+  const paidLiveJobs = Object.hasOwn(provenance, 'paid_live_jobs')
+    ? ownBoolean(provenance, 'paid_live_jobs', pathLabel)
+    : false;
+  return {
+    class: recordedClass,
+    independently_verified: false,
+    paid_live_jobs: paidLiveJobs,
+  };
+}
+
+export function compareTrials(cases, trials, options = {}) {
+  if (!Array.isArray(cases) || cases.length === 0 || cases.length > MAX_CASES) {
+    fail('bounds_exceeded', 'cases must contain 1..32 frozen case definitions.');
+  }
+  if (!Array.isArray(trials) || trials.length > MAX_TRIALS) {
+    fail('bounds_exceeded', `trials exceed ${MAX_TRIALS}.`);
+  }
+  const parsedCases = cases.map((entry, index) => parseCase(entry, `cases[${index}]`));
+  const seenCaseIds = new Set();
+  for (const caseRecord of parsedCases) {
+    if (seenCaseIds.has(caseRecord.id)) {
+      fail('duplicate_id', `duplicate case id ${caseRecord.id}`);
+    }
+    seenCaseIds.add(caseRecord.id);
+  }
+  const parsedTrials = trials.map((entry, index) => parseTrial(entry, `trials[${index}]`));
+  const seenTrials = new Set();
+  for (const trial of parsedTrials) {
+    if (seenTrials.has(trial.trial_id)) fail('duplicate_id', `duplicate trial_id ${trial.trial_id}`);
+    seenTrials.add(trial.trial_id);
+  }
+  const caseById = new Map(parsedCases.map((entry) => [entry.id, entry]));
+  const suppliedProvenance = parseProvenance(options.provenance);
+  const provenance = parsedTrials.some(trial => trial.coengineer_source.kind === 'synthetic_label')
+    ? { ...suppliedProvenance, class: 'synthetic_unverified' } : suppliedProvenance;
+  const rows = [];
+  for (const caseRecord of parsedCases) {
+    const arms = {};
+    for (const arm of ALL_ARMS) {
+      const matched = [];
+      const unmatched = [];
+      for (const trial of parsedTrials) {
+        if (trial.case_id !== caseRecord.id || trial.arm !== arm) continue;
+        const mismatch = comparableMatch(trial, caseRecord);
+        if (mismatch) unmatched.push({ trial_id: trial.trial_id, reason: mismatch });
+        else matched.push(trial);
+      }
+      const identities = new Set(matched.map((trial) => trial.coengineer_source.key));
+      if (identities.size > 1) {
+        fail(
+          'mixed_candidate_identity',
+          `arm ${arm} for case ${caseRecord.id} mixes coengineer_source identities.`,
+        );
+      }
+      const bases = new Set(matched.map((trial) => trial.base_sha));
+      if (bases.size > 1) {
+        fail(
+          'mixed_base_sha',
+          `arm ${arm} for case ${caseRecord.id} mixes materialized base SHAs.`,
+        );
+      }
+      const hostModels = new Set(matched.map((trial) => trial.host_model));
+      const hostSettings = new Set(matched.map((trial) => settingsDigest(trial.host_settings)));
+      if (hostModels.size > 1 || hostSettings.size > 1) {
+        fail(
+          'identity_mismatch',
+          `arm ${arm} for case ${caseRecord.id} mixes host model or settings.`,
+        );
+      }
+      if (COENGINEER_ARMS.includes(arm)) {
+        const providers = new Set(matched.map((trial) => settingsDigest(trial.provider_configuration)));
+        if (providers.size > 1) {
+          fail(
+            'identity_mismatch',
+            `arm ${arm} for case ${caseRecord.id} mixes provider configuration.`,
+          );
+        }
+      }
+      const required = REQUIRED_ARMS.includes(arm);
+      let status = 'compared';
+      if (matched.length === 0 && unmatched.length === 0) status = required ? 'unrun' : 'optional_unrun';
+      else if (matched.length === 0) status = 'unmatched';
+      arms[arm] = {
+        arm,
+        status,
+        unmatched,
+        coengineer_source: matched[0]?.coengineer_source ?? null,
+        ...aggregateTrials(matched),
+      };
+    }
+    rows.push({
+      case_id: caseRecord.id,
+      title: caseRecord.title,
+      input_digest: caseRecord.input_digest,
+      base_sha: caseRecord.base_sha,
+      arms,
+    });
+  }
+  const unknownCases = parsedTrials
+    .filter((trial) => !caseById.has(trial.case_id))
+    .map((trial) => trial.trial_id);
+  return {
+    schema: COMPARISON_SCHEMA_ID,
+    version: 1,
+    provenance: {
+      class: provenance.class,
+      independently_verified: false,
+      synthetic: provenance.class === 'synthetic_unverified',
+      paid_live_jobs: provenance.paid_live_jobs,
+    },
+    paid_live_jobs: 'not_implemented',
+    unknown_case_trials: unknownCases,
+    cases: rows,
+  };
+}
+
+async function readJsonBounded(filePath, maxBytes, pathLabel) {
+  const info = await stat(filePath);
+  if (info.size > maxBytes) {
+    fail('bounds_exceeded', `${pathLabel} exceeds ${maxBytes} bytes.`);
+  }
+  const text = await readFile(filePath, 'utf8');
+  if (Buffer.byteLength(text, 'utf8') > maxBytes) {
+    fail('bounds_exceeded', `${pathLabel} exceeds ${maxBytes} bytes.`);
+  }
+  return JSON.parse(text);
+}
+
+export async function loadCases(directory) {
+  const entries = await readdir(directory);
+  const files = entries.filter((name) => name.endsWith('.json')).sort();
+  if (files.length < 1 || files.length > MAX_CASES) {
+    fail('bounds_exceeded', `cases directory must contain 1..${MAX_CASES} JSON files.`);
+  }
+  const cases = [];
+  for (const file of files) {
+    const parsed = await readJsonBounded(path.join(directory, file), MAX_CASE_JSON_BYTES, file);
+    cases.push(parseCase(parsed, file));
+  }
+  const seen = new Set();
+  for (const caseRecord of cases) {
+    if (seen.has(caseRecord.id)) fail('duplicate_id', `duplicate case id ${caseRecord.id}`);
+    seen.add(caseRecord.id);
+  }
+  return cases;
+}
+
+export async function loadTrials(filePath) {
+  const parsed = await readJsonBounded(filePath, MAX_TRIALS_JSON_BYTES, path.basename(filePath));
+  if (Array.isArray(parsed)) {
+    return {
+      trials: parsed,
+      provenance: parseProvenance(null),
+    };
+  }
+  assertPlain(parsed, 'trials');
+  if (parsed.schema != null && parsed.schema !== TRIALS_SCHEMA_ID) {
+    fail('invalid_format', 'trials.schema');
+  }
+  const rows = parsed.trials;
+  if (!Array.isArray(rows)) fail('invalid_type', 'trials must be a JSON array or { trials: [] }.');
+  return {
+    trials: rows,
+    provenance: parseProvenance(parsed.provenance),
+  };
+}
+
+export async function loadProtocol(filePath) {
+  const protocol = await readJsonBounded(filePath, MAX_PROTOCOL_JSON_BYTES, 'protocol');
+  if (protocol.schema !== PROTOCOL_SCHEMA_ID) fail('invalid_format', 'protocol.schema');
+  return protocol;
+}
+
+export function caseCommitMessage(caseId) {
+  return `${CASE_SCHEMA_ID}:${caseId}`;
+}
+
+async function runGit(cwd, args) {
+  const env = {
+    PATH: process.env.PATH ?? '/usr/bin:/bin',
+    TMPDIR: os.tmpdir(),
+    GIT_CONFIG_NOSYSTEM: '1',
+    GIT_CONFIG_GLOBAL: '/dev/null',
+    GIT_CONFIG_SYSTEM: '/dev/null',
+    GIT_AUTHOR_NAME: CASE_GIT_IDENTITY.name,
+    GIT_AUTHOR_EMAIL: CASE_GIT_IDENTITY.email,
+    GIT_AUTHOR_DATE: CASE_GIT_IDENTITY.date,
+    GIT_COMMITTER_NAME: CASE_GIT_IDENTITY.name,
+    GIT_COMMITTER_EMAIL: CASE_GIT_IDENTITY.email,
+    GIT_COMMITTER_DATE: CASE_GIT_IDENTITY.date,
+    GIT_TERMINAL_PROMPT: '0',
+    GIT_OPTIONAL_LOCKS: '0',
+    LANG: 'C',
+    LC_ALL: 'C',
+  };
+  try {
+    const result = await execFile(GIT_EXECUTABLE, args, {
+      cwd,
+      env,
+      timeout: GIT_TIMEOUT_MS,
+      maxBuffer: 64 * 1024,
+    });
+    return String(result.stdout ?? '');
+  } catch (error) {
+    const stderr = error instanceof Error ? String(error.stderr ?? error.message) : String(error);
+    fail('git_execution_failed', `git ${args.join(' ')} failed: ${stderr.trim()}`);
+  }
+}
+
+async function assertEmptyDestination(destination) {
+  try {
+    const info = await stat(destination);
+    if (!info.isDirectory()) {
+      fail('invalid_type', 'destination must be an empty directory.');
+    }
+    const names = await readdir(destination);
+    if (names.length > 0) {
+      fail('destination_not_empty', 'destination must be empty.');
+    }
+  } catch (error) {
+    if (error && typeof error === 'object' && 'code' in error && error.code === 'ENOENT') {
+      await mkdir(destination);
+      return;
+    }
+    throw error;
+  }
+}
+
+export async function materializeCase(caseRecord, destination) {
+  const parsed = parseCase(caseRecord, 'case');
+  const dest = path.resolve(destination);
+  await assertEmptyDestination(dest);
+  for (const relative of Object.keys(parsed.inputs.files)) {
+    assertSafeRelativePath(relative, `inputs.files.${relative}`);
+    const target = path.join(dest, relative);
+    const resolved = path.resolve(dest, relative);
+    if (resolved !== target || !resolved.startsWith(`${dest}${path.sep}`)) {
+      fail('invalid_format', `${relative} escapes the destination.`);
+    }
+    const parent = path.dirname(target);
+    if (parent !== dest) await mkdir(parent, { recursive: true });
+    await writeFile(target, parsed.inputs.files[relative], { encoding: 'utf8', mode: 0o644 });
+  }
+  await runGit(dest, ['-c', 'init.defaultBranch=main', 'init', '--initial-branch=main']);
+  await runGit(dest, [
+    '-c', 'core.autocrlf=false',
+    '-c', 'core.eol=lf',
+    '-c', 'core.safecrlf=false',
+    'add', '-A',
+  ]);
+  await runGit(dest, [
+    '-c', `user.name=${CASE_GIT_IDENTITY.name}`,
+    '-c', `user.email=${CASE_GIT_IDENTITY.email}`,
+    '-c', 'commit.gpgsign=false',
+    'commit', '--no-gpg-sign', '-m', caseCommitMessage(parsed.id),
+  ]);
+  const head = (await runGit(dest, ['rev-parse', 'HEAD'])).trim();
+  if (!SHA40.test(head)) fail('git_execution_failed', 'materialized HEAD is not a 40-character SHA.');
+  if (parsed.base_sha != null && parsed.base_sha !== head) {
+    fail(
+      'identity_mismatch',
+      `materialized base SHA ${head} does not match case.base_sha ${parsed.base_sha}.`,
+    );
+  }
+  return {
+    case_id: parsed.id,
+    destination: dest,
+    base_sha: head,
+    input_digest: parsed.input_digest,
+    git_identity: { ...CASE_GIT_IDENTITY, message: caseCommitMessage(parsed.id) },
+  };
+}
+
+function printUsage() {
+  return `Usage:
+  node scripts/compare-coengineer-runs.mjs --validate-cases DIR
+  node scripts/compare-coengineer-runs.mjs --materialize-case FILE --destination DIR
+  node scripts/compare-coengineer-runs.mjs --cases DIR --trials FILE [--protocol FILE]
+
+Offline analysis of sanitized trial records. Live provider jobs are not
+implemented. Paid repeated trials require --live --paid-budget and are still
+not executed by this command. Synthetic fixtures are labeled unverified.
+Unknown flags are rejected. Case and trial files are size-bounded.
+`;
+}
+
+function parseArgv(argv) {
+  const flags = Object.create(null);
+  for (let index = 0; index < argv.length; index += 1) {
+    const arg = argv[index];
+    if (arg === '--help' || arg === '--live') {
+      flags[arg] = true;
+      continue;
+    }
+    if (!arg.startsWith('--')) {
+      fail('unknown_flag', `Unexpected argument ${arg}.`);
+    }
+    if (BOOLEAN_FLAGS.includes(arg)) {
+      flags[arg] = true;
+      continue;
+    }
+    if (arg === '--validate-cases') {
+      const nested = argv[index + 1];
+      if (nested != null && !nested.startsWith('--')) {
+        flags[arg] = nested;
+        index += 1;
+      } else {
+        flags[arg] = true;
+      }
+      continue;
+    }
+    if (!VALUE_FLAGS.includes(arg)) {
+      fail('unknown_flag', `Unknown flag ${arg}.`);
+    }
+    const value = argv[index + 1];
+    if (value == null || value.startsWith('--')) {
+      fail('missing_flag', `${arg} requires a value.`);
+    }
+    flags[arg] = value;
+    index += 1;
+  }
+  return flags;
+}
+
+export async function main(argv, io = { stdout: process.stdout, stderr: process.stderr }) {
+  if (argv.includes('--help') || argv.length === 0) {
+    io.stdout.write(printUsage());
+    return 0;
+  }
+  let flags;
+  try {
+    flags = parseArgv(argv);
+  } catch (error) {
+    io.stderr.write(`${error instanceof Error ? error.message : String(error)}\n`);
+    io.stderr.write(printUsage());
+    return 2;
+  }
+  if (flags['--live']) {
+    io.stderr.write('Live provider jobs are not implemented. Supply sanitized trial records.\n');
+    if (flags['--paid-budget'] == null) {
+      io.stderr.write('Paid repeated trials are opt-in and require --paid-budget.\n');
+    }
+    return 2;
+  }
+  if (flags['--materialize-case'] != null) {
+    if (flags['--destination'] == null) {
+      io.stderr.write('Missing --destination DIR.\n');
+      io.stderr.write(printUsage());
+      return 2;
+    }
+    const record = await readJsonBounded(
+      path.resolve(flags['--materialize-case']),
+      MAX_CASE_JSON_BYTES,
+      'materialize-case',
+    );
+    const materialized = await materializeCase(parseCase(record), path.resolve(flags['--destination']));
+    io.stdout.write(`${JSON.stringify(materialized, null, 2)}\n`);
+    return 0;
+  }
+  if (Object.hasOwn(flags, '--validate-cases')) {
+    const casesDir = typeof flags['--validate-cases'] === 'string'
+      ? flags['--validate-cases']
+      : flags['--cases'];
+    if (casesDir == null) {
+      io.stderr.write('Missing --validate-cases DIR.\n');
+      io.stderr.write(printUsage());
+      return 2;
+    }
+    if (flags['--protocol'] != null) await loadProtocol(path.resolve(flags['--protocol']));
+    const cases = await loadCases(path.resolve(casesDir));
+    io.stdout.write(`${JSON.stringify({
+      valid: true,
+      case_count: cases.length,
+      ids: cases.map((entry) => entry.id),
+      input_digests: Object.fromEntries(cases.map((entry) => [entry.id, entry.input_digest])),
+    }, null, 2)}\n`);
+    return 0;
+  }
+  if (flags['--cases'] == null || flags['--trials'] == null) {
+    io.stderr.write('Missing --cases DIR and/or --trials FILE. This command analyzes sanitized records only.\n');
+    io.stderr.write(printUsage());
+    return 2;
+  }
+  if (flags['--protocol'] != null) await loadProtocol(path.resolve(flags['--protocol']));
+  const cases = await loadCases(path.resolve(flags['--cases']));
+  const loaded = await loadTrials(path.resolve(flags['--trials']));
+  const comparison = compareTrials(cases, loaded.trials, { provenance: loaded.provenance });
+  io.stdout.write(`${JSON.stringify(comparison, null, 2)}\n`);
+  return 0;
+}
+
+const isMain = process.argv[1]
+  && path.resolve(process.argv[1]) === fileURLToPath(import.meta.url);
+if (isMain) {
+  main(process.argv.slice(2)).then((code) => {
+    process.exitCode = code;
+  }).catch((error) => {
+    process.stderr.write(`${error instanceof Error ? error.message : String(error)}\n`);
+    process.exitCode = 1;
+  });
+}
diff --git a/scripts/compare-coengineer-runs.test.mjs b/scripts/compare-coengineer-runs.test.mjs
new file mode 100644
index 0000000..0381736
--- /dev/null
+++ b/scripts/compare-coengineer-runs.test.mjs
@@ -0,0 +1,571 @@
+import assert from 'node:assert/strict';
+import { mkdir, mkdtemp, readFile, rm, writeFile } from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import test from 'node:test';
+import { fileURLToPath } from 'node:url';
+
+import {
+  compareTrials,
+  computeInputDigest,
+  loadCases,
+  loadTrials,
+  main,
+  materializeCase,
+  parseCase,
+  parseTrial,
+  parseUsageMetric,
+} from './compare-coengineer-runs.mjs';
+
+const ROOT = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..');
+const CASES_DIR = path.join(ROOT, 'benchmarks/cases');
+const FIXTURE = path.join(ROOT, 'benchmarks/fixtures/analysis-fixture.json');
+const PROTOCOL = path.join(ROOT, 'benchmarks/protocol.json');
+
+function settings() {
+  return { reasoning: 'default', sandbox: 'workspace-write' };
+}
+
+function provider(implement = 'grok', review = null) {
+  return { implement, review };
+}
+
+function metric(value, source = 'host_measured', trust = 'host_authoritative') {
+  return { value, source, trust };
+}
+
+function caseById(cases, id) {
+  return cases.find((entry) => entry.id === id);
+}
+
+function trial(caseRecord, overrides = {}) {
+  const arm = overrides.arm ?? 'candidate-3.4.3';
+  return {
+    schema: 'codex-co-engineer.benchmark-trial.v1',
+    trial_id: 'trial-one',
+    case_id: caseRecord.id,
+    arm,
+    base_sha: caseRecord.base_sha,
+    input_digest: caseRecord.input_digest,
+    coengineer_source: arm === 'native-codex'
+      ? { kind: 'native', value: 'native-codex' }
+      : { kind: 'synthetic_label', value: `fixture:${arm}` },
+    host_model: 'codex-default',
+    host_settings: settings(),
+    provider_configuration: arm === 'native-codex' ? { implement: 'native' } : provider(),
+    accepted: false,
+    wall_elapsed_ms: metric(1000),
+    attempts: [{
+      attempt_id: 'attempt-one',
+      kind: 'initial',
+      outcome: 'failed',
+      usage: {
+        native_input_tokens: metric(10),
+        elapsed_ms: metric(1000),
+      },
+    }],
+    ...overrides,
+    case_id: overrides.case_id ?? caseRecord.id,
+    base_sha: overrides.base_sha ?? caseRecord.base_sha,
+    input_digest: overrides.input_digest ?? caseRecord.input_digest,
+  };
+}
+
+test('fixture cases and analysis records load as synthetic unverified', async () => {
+  const cases = await loadCases(CASES_DIR);
+  assert.equal(cases.length, 4);
+  const ids = cases.map((entry) => entry.id);
+  assert.equal(ids.includes('single-file-bugfix'), true);
+  const loaded = await loadTrials(FIXTURE);
+  const comparison = compareTrials(cases, loaded.trials, { provenance: loaded.provenance });
+  assert.equal(comparison.provenance.class, 'synthetic_unverified');
+  assert.equal(comparison.provenance.independently_verified, false);
+  assert.equal(comparison.provenance.synthetic, true);
+  assert.equal(Object.hasOwn(comparison, 'invented_results'), false);
+  const bugfix = comparison.cases.find((row) => row.case_id === 'single-file-bugfix');
+  assert.equal(bugfix.arms['candidate-3.4.3'].status, 'compared');
+  assert.equal(bugfix.arms['direct-delegation'].status, 'optional_unrun');
+  assert.equal(bugfix.arms['candidate-3.4.3'].failed_attempt_count, 1);
+  assert.equal(bugfix.arms['candidate-3.4.3'].correction_count, 1);
+  assert.equal(bugfix.arms['native-codex'].native_helper_count, 1);
+  assert.equal(bugfix.arms['candidate-3.4.3'].usage.native_input_tokens.value, 40);
+  assert.equal(bugfix.arms['native-codex'].usage.elapsed_ms.value, 4900);
+  assert.equal(bugfix.arms['native-codex'].usage.elapsed_ms.role, 'attempt_duration_sum');
+  assert.equal(bugfix.arms['native-codex'].usage.wall_elapsed_ms.value, 4000);
+  assert.equal(bugfix.arms['native-codex'].usage.wall_elapsed_ms.role, 'trial_wall_elapsed');
+});
+
+test('materializeCase writes a reproducible git commit under TMPDIR', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const bugfix = caseById(cases, 'single-file-bugfix');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-bench-'));
+  try {
+    const dest1 = path.join(root, 'a');
+    const dest2 = path.join(root, 'b');
+    await mkdir(dest1);
+    await mkdir(dest2);
+    const first = await materializeCase(bugfix, dest1);
+    const second = await materializeCase(bugfix, dest2);
+    assert.equal(first.base_sha, bugfix.base_sha);
+    assert.equal(second.base_sha, bugfix.base_sha);
+    assert.equal(first.input_digest, bugfix.input_digest);
+    const written = await readFile(path.join(dest1, 'sum.mjs'), 'utf8');
+    assert.equal(written, bugfix.inputs.files['sum.mjs']);
+    await assert.rejects(() => materializeCase(bugfix, dest1), { code: 'destination_not_empty' });
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('changed frozen acceptance checks are rejected', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const bugfix = caseById(cases, 'single-file-bugfix');
+  const mutated = structuredClone({
+    schema: bugfix.schema,
+    id: bugfix.id,
+    title: bugfix.title,
+    summary: bugfix.summary,
+    input_digest: bugfix.input_digest,
+    base_sha: bugfix.base_sha,
+    comparable: bugfix.comparable,
+    inputs: bugfix.inputs,
+    acceptance: {
+      ...bugfix.acceptance,
+      checks: [{ id: 'unit', command: ['node', '--test', 'other.test.mjs'], expect_exit: 0 }],
+    },
+  });
+  assert.throws(() => parseCase(mutated), { code: 'identity_mismatch' });
+  const recomputed = computeInputDigest(bugfix.inputs.files, mutated.acceptance);
+  assert.notEqual(recomputed, bugfix.input_digest);
+});
+
+test('unsafe case paths and duplicate case ids are rejected', () => {
+  const raw = {
+    schema: 'codex-co-engineer.benchmark-case.v1',
+    id: 'single-file-bugfix',
+    title: 'x',
+    summary: 'y',
+    comparable: {
+      host_model: 'codex-default',
+      host_settings: settings(),
+      provider_configuration: provider(),
+    },
+    inputs: { files: { '../escape.mjs': 'no\n' } },
+    acceptance: { checks: [{ id: 'unit', command: ['node', '--test', 'sum.test.mjs'], expect_exit: 0 }] },
+  };
+  assert.throws(() => parseCase(raw), { code: 'invalid_format' });
+  const cases = [
+    {
+      schema: 'codex-co-engineer.benchmark-case.v1',
+      id: 'single-file-bugfix',
+      title: 'a',
+      summary: 'a',
+      comparable: raw.comparable,
+      inputs: { files: { 'sum.mjs': 'export {}\n' } },
+      acceptance: raw.acceptance,
+    },
+    {
+      schema: 'codex-co-engineer.benchmark-case.v1',
+      id: 'single-file-bugfix',
+      title: 'b',
+      summary: 'b',
+      comparable: raw.comparable,
+      inputs: { files: { 'sum.mjs': 'export {}\n' } },
+      acceptance: raw.acceptance,
+    },
+  ];
+  assert.throws(() => compareTrials(cases, []), { code: 'duplicate_id' });
+});
+
+test('parseUsageMetric rejects mismatched source/trust pairs', () => {
+  assert.throws(() => parseUsageMetric({
+    value: 3,
+    source: 'provider_report',
+    trust: 'host_authoritative',
+  }, 'usage.provider_input_tokens', 'provider_input_tokens'), { code: 'identity_mismatch' });
+  const ok = parseUsageMetric({
+    value: 3,
+    source: 'provider_report',
+    trust: 'provider_untrusted',
+  }, 'usage.provider_input_tokens', 'provider_input_tokens');
+  assert.equal(ok.value, 3);
+});
+
+test('failed attempts remain in usage-per-accepted denominators', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const failing = caseById(cases, 'failing-check-then-fix');
+  const comparison = compareTrials(cases, [
+    trial(failing, {
+      trial_id: 'fail-then-pass',
+      accepted: true,
+      wall_elapsed_ms: metric(3000),
+      attempts: [
+        {
+          attempt_id: 'first',
+          kind: 'initial',
+          outcome: 'failed',
+          usage: { native_input_tokens: metric(10), elapsed_ms: metric(1000) },
+        },
+        {
+          attempt_id: 'second',
+          kind: 'correction',
+          outcome: 'accepted',
+          usage: { native_input_tokens: metric(15), elapsed_ms: metric(2000) },
+        },
+      ],
+    }),
+  ]);
+  const row = comparison.cases.find((entry) => entry.case_id === 'failing-check-then-fix')
+    .arms['candidate-3.4.3'];
+  assert.equal(row.accepted_count, 1);
+  assert.equal(row.failed_attempt_count, 1);
+  assert.equal(row.usage.native_input_tokens.value, 25);
+  assert.equal(row.usage_per_accepted_result.native_input_tokens.value, 25);
+  assert.equal(row.usage_per_accepted_result.native_input_tokens.reason, 'includes_failed_attempts_and_corrections');
+  assert.equal(row.usage_per_accepted_result.native_input_tokens.numerator, 25);
+});
+
+test('mixed known and unknown acceptance leaves usage-per-accepted unknown', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const failing = caseById(cases, 'failing-check-then-fix');
+  const comparison = compareTrials(cases, [
+    trial(failing, {
+      trial_id: 'known-accept',
+      accepted: true,
+      attempts: [{
+        attempt_id: 'ok',
+        kind: 'initial',
+        outcome: 'accepted',
+        usage: { native_input_tokens: metric(10) },
+      }],
+    }),
+    (() => {
+      const missing = trial(failing, {
+        trial_id: 'missing-accept',
+        attempts: [{
+          attempt_id: 'maybe',
+          kind: 'initial',
+          outcome: 'uncertain',
+          usage: { native_input_tokens: metric(7) },
+        }],
+      });
+      delete missing.accepted;
+      return missing;
+    })(),
+  ]);
+  const row = comparison.cases.find((entry) => entry.case_id === 'failing-check-then-fix')
+    .arms['candidate-3.4.3'];
+  assert.equal(row.accepted_count, 1);
+  assert.equal(row.accepted_known_count, 1);
+  assert.equal(row.usage.native_input_tokens.value, 17);
+  const per = row.usage_per_accepted_result.native_input_tokens;
+  assert.equal(per.value, null);
+  assert.equal(per.reason, 'incomplete_acceptance_coverage');
+  assert.equal(per.numerator, 17);
+  assert.equal(per.known_accepted_count, 1);
+  assert.equal(per.coverage.trial_count, 2);
+  assert.equal(row.acceptance_rate.value, null);
+});
+
+test('native helpers and missing values stay labeled', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const review = caseById(cases, 'independent-review');
+  const comparison = compareTrials(cases, [
+    trial(review, {
+      trial_id: 'native-review',
+      arm: 'native-codex',
+      accepted: true,
+      provider_configuration: { implement: 'native' },
+      coengineer_source: { kind: 'native', value: 'native-codex' },
+      wall_elapsed_ms: metric(800),
+      attempts: [
+        {
+          attempt_id: 'helper',
+          kind: 'native_helper',
+          outcome: 'accepted',
+          usage: {
+            native_helper_calls: metric(2),
+            native_input_tokens: { value: null, source: 'unknown', trust: 'unknown' },
+            model_facing_bytes: metric(64),
+            elapsed_ms: metric(200),
+          },
+        },
+      ],
+    }),
+  ]);
+  const row = comparison.cases.find((entry) => entry.case_id === 'independent-review')
+    .arms['native-codex'];
+  assert.equal(row.native_helper_count, 1);
+  assert.equal(row.usage.native_input_tokens.value, null);
+  assert.equal(row.usage.native_input_tokens.source, 'unknown');
+  assert.equal(row.usage.model_facing_bytes.value, 64);
+  assert.equal(row.usage.model_facing_bytes.unit, 'bytes');
+  assert.equal(row.usage.provider_input_tokens.source, 'unknown');
+  assert.equal(row.usage.elapsed_ms.value, 200);
+  assert.equal(row.usage.wall_elapsed_ms.value, 800);
+  assert.equal(row.usage_per_accepted_result.native_input_tokens.reason, 'unknown_metric');
+});
+
+test('native parent usage must exclude separately recorded helpers', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const review = caseById(cases, 'independent-review');
+  assert.throws(() => parseTrial(trial(review, {
+    arm: 'native-codex',
+    provider_configuration: { implement: 'native' },
+    coengineer_source: { kind: 'native', value: 'native-codex' },
+    attempts: [
+      {
+        attempt_id: 'parent',
+        kind: 'initial',
+        outcome: 'failed',
+        usage: { native_input_tokens: metric(11) },
+      },
+      {
+        attempt_id: 'helper',
+        kind: 'native_helper',
+        outcome: 'accepted',
+        usage: { native_helper_calls: metric(1) },
+      },
+    ],
+  })), { code: 'identity_mismatch' });
+});
+
+test('duplicate attempt IDs keep the latest compatible cumulative snapshot', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const failing = caseById(cases, 'failing-check-then-fix');
+  const parsed = parseTrial(trial(failing, {
+    attempts: [
+      {
+        attempt_id: 'same',
+        kind: 'initial',
+        outcome: 'failed',
+        sequence: 1,
+        usage: { native_input_tokens: metric(10) },
+      },
+      {
+        attempt_id: 'same',
+        kind: 'initial',
+        outcome: 'failed',
+        sequence: 2,
+        usage: { native_input_tokens: metric(18) },
+      },
+    ],
+  }));
+  assert.equal(parsed.attempts.length, 1);
+  assert.equal(parsed.attempts[0].usage.native_input_tokens.value, 18);
+  assert.deepEqual(parsed.cumulative_replaced, ['same']);
+  assert.throws(() => parseTrial(trial(failing, {
+    attempts: [
+      {
+        attempt_id: 'same',
+        kind: 'initial',
+        outcome: 'failed',
+        sequence: 1,
+        usage: { native_input_tokens: metric(10) },
+      },
+      {
+        attempt_id: 'same',
+        kind: 'correction',
+        outcome: 'failed',
+        sequence: 2,
+        usage: { native_input_tokens: metric(18) },
+      },
+    ],
+  })), { code: 'incompatible_snapshot' });
+  assert.throws(() => parseTrial(trial(failing, {
+    attempts: [
+      {
+        attempt_id: 'same',
+        kind: 'initial',
+        outcome: 'failed',
+        sequence: 1,
+        usage: { native_input_tokens: metric(10) },
+      },
+      {
+        attempt_id: 'same',
+        kind: 'initial',
+        outcome: 'accepted',
+        sequence: 2,
+        usage: { native_input_tokens: metric(18) },
+      },
+    ],
+  })), { code: 'incompatible_snapshot' });
+});
+
+test('zero acceptance is not zero cost and mismatched settings are unmatched', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const failing = caseById(cases, 'failing-check-then-fix');
+  const correction = caseById(cases, 'review-driven-correction');
+  const comparison = compareTrials(cases, [
+    trial(failing, {
+      trial_id: 'zero-accept',
+      accepted: false,
+      attempts: [{
+        attempt_id: 'only',
+        kind: 'initial',
+        outcome: 'failed',
+        provider: 'grok',
+        model: 'grok-4',
+        usage: {
+          native_input_tokens: metric(9),
+          provider_cost_millicents: metric(0, 'provider_report', 'provider_untrusted'),
+        },
+      }],
+    }),
+    trial(correction, {
+      trial_id: 'mismatch',
+      accepted: true,
+      host_model: 'other-host',
+    }),
+  ]);
+  const failed = comparison.cases.find((entry) => entry.case_id === 'failing-check-then-fix')
+    .arms['candidate-3.4.3'];
+  assert.equal(failed.accepted_count, 0);
+  assert.equal(failed.usage.native_input_tokens.value, 9);
+  assert.equal(failed.usage_per_accepted_result.native_input_tokens.value, null);
+  assert.equal(failed.usage_per_accepted_result.native_input_tokens.reason, 'zero_accepted_not_zero_cost');
+  assert.equal(failed.usage.provider_cost_millicents.value, 0);
+  assert.notEqual(failed.usage_per_accepted_result.native_input_tokens.reason, 'measured_zero');
+  const mismatched = comparison.cases.find((entry) => entry.case_id === 'review-driven-correction')
+    .arms['candidate-3.4.3'];
+  assert.equal(mismatched.status, 'unmatched');
+  assert.equal(mismatched.unmatched[0].reason, 'host_model_mismatch');
+  assert.equal(mismatched.trial_count, 0);
+});
+
+test('mixed providers keep groups and make aggregate tokens non-comparable', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const failing = caseById(cases, 'failing-check-then-fix');
+  const comparison = compareTrials(cases, [
+    trial(failing, {
+      trial_id: 'two-providers',
+      accepted: true,
+      attempts: [
+        {
+          attempt_id: 'grok-arm',
+          kind: 'initial',
+          outcome: 'completed_unaccepted',
+          provider: 'grok',
+          model: 'grok-4',
+          usage: {
+            provider_input_tokens: metric(40, 'provider_report', 'provider_untrusted'),
+            provider_cost_millicents: metric(12, 'provider_report', 'provider_untrusted'),
+          },
+        },
+        {
+          attempt_id: 'cursor-arm',
+          kind: 'correction',
+          outcome: 'accepted',
+          provider: 'cursor-local',
+          model: 'composer',
+          usage: {
+            provider_input_tokens: metric(15, 'provider_report', 'provider_untrusted'),
+            provider_cost_millicents: metric(4, 'provider_report', 'provider_untrusted'),
+          },
+        },
+      ],
+    }),
+  ]);
+  const row = comparison.cases.find((entry) => entry.case_id === 'failing-check-then-fix')
+    .arms['candidate-3.4.3'];
+  const tokens = row.usage.provider_input_tokens;
+  assert.equal(tokens.value, null);
+  assert.equal(tokens.reason, 'mixed_providers_non_comparable');
+  assert.equal(tokens.reported_sum, 55);
+  assert.equal(tokens.groups.length, 2);
+  assert.equal(tokens.groups[0].provider, 'cursor-local');
+  assert.equal(tokens.groups[0].model, 'composer');
+  assert.equal(tokens.groups[0].value, 15);
+  assert.equal(tokens.groups[1].provider, 'grok');
+  assert.equal(tokens.groups[1].model, 'grok-4');
+  assert.equal(tokens.groups[1].value, 40);
+  assert.equal(row.usage.provider_cost_millicents.groups.length, 2);
+});
+
+test('arm labels cannot mix coengineer source identities', async () => {
+  const cases = await loadCases(CASES_DIR);
+  const failing = caseById(cases, 'failing-check-then-fix');
+  assert.throws(() => compareTrials(cases, [
+    trial(failing, {
+      trial_id: 'build-a',
+      accepted: true,
+      coengineer_source: { kind: 'synthetic_label', value: 'fixture:candidate-3.4.3' },
+    }),
+    trial(failing, {
+      trial_id: 'build-b',
+      accepted: true,
+      coengineer_source: { kind: 'synthetic_label', value: 'fixture:candidate-other' },
+    }),
+  ]), { code: 'mixed_candidate_identity' });
+});
+
+test('CLI validates DIR, analyzes fixtures, and rejects unknown flags', async () => {
+  const chunks = [];
+  const errors = [];
+  const io = {
+    stdout: { write(text) { chunks.push(text); return true; } },
+    stderr: { write(text) { errors.push(text); return true; } },
+  };
+  const validated = await main(['--validate-cases', CASES_DIR], io);
+  assert.equal(validated, 0);
+  assert.equal(chunks.join('').includes('single-file-bugfix'), true);
+  const validatedAlias = await main(['--validate-cases', '--cases', CASES_DIR], io);
+  assert.equal(validatedAlias, 0);
+  const analyzed = await main([
+    '--cases', CASES_DIR,
+    '--trials', FIXTURE,
+    '--protocol', PROTOCOL,
+  ], io);
+  assert.equal(analyzed, 0);
+  assert.equal(chunks.join('').includes('synthetic_unverified'), true);
+  const live = await main(['--live'], io);
+  assert.equal(live, 2);
+  assert.equal(errors.join('').includes('Live provider jobs are not implemented'), true);
+  const paid = await main(['--live', '--paid-budget', '1'], io);
+  assert.equal(paid, 2);
+  const unknown = await main(['--cases', CASES_DIR, '--bogus'], io);
+  assert.equal(unknown, 2);
+  assert.equal(errors.join('').includes('Unknown flag --bogus'), true);
+  const missing = await main(['--trials', FIXTURE], io);
+  assert.equal(missing, 2);
+
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-cli-'));
+  try {
+    const dest = path.join(root, 'case');
+    const materialized = await main([
+      '--materialize-case', path.join(CASES_DIR, 'single-file-bugfix.json'),
+      '--destination', dest,
+    ], io);
+    assert.equal(materialized, 0);
+    assert.equal(chunks.join('').includes('df49c63059159a79646258358850bef0590ca583'), true);
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('CLI bounds reject oversized trial files', async () => {
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-bound-'));
+  const errors = [];
+  const io = {
+    stdout: { write() { return true; } },
+    stderr: { write(text) { errors.push(text); return true; } },
+  };
+  try {
+    const huge = path.join(root, 'huge.json');
+    await writeFile(huge, `${'a'.repeat(1_048_577)}`);
+    await assert.rejects(
+      () => main(['--cases', CASES_DIR, '--trials', huge], io),
+      { code: 'bounds_exceeded' },
+    );
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('cumulative snapshots cannot move previously reported usage to another model', async () => {
+  const c = (await loadCases(CASES_DIR))[0];
+  const usage = { provider_output_tokens: metric(20, 'provider_report', 'provider_untrusted') };
+  const first = { attempt_id: 'provider-attempt', sequence: 1, kind: 'initial', outcome: 'unfinal', provider: 'grok', model: 'model-a', usage };
+  const changed = { ...first, sequence: 2, model: 'model-b' };
+  assert.throws(() => parseTrial(trial(c, { attempts: [first, changed] })), error => error.code === 'incompatible_snapshot');
+});
diff --git a/scripts/inspector-preflight.mjs b/scripts/inspector-preflight.mjs
index fc35dbf..a9dc409 100755
--- a/scripts/inspector-preflight.mjs
+++ b/scripts/inspector-preflight.mjs
@@ -34,7 +34,7 @@ try {
   const statusEnvelope = inspect('tools/call', 'status');
   const status = statusEnvelope.structuredContent
     ?? JSON.parse(statusEnvelope.content?.[0]?.text ?? '{}');
-  assert.equal(status.version, '3.4.2');
+  assert.equal(status.version, '3.4.3');
   assert.equal(status.healthy, status.local_boundary.ready);
   assert.equal(status.active, 0);
   assert.deepEqual(status.tasks, []);
diff --git a/scripts/mcp-environment-preflight.mjs b/scripts/mcp-environment-preflight.mjs
index f4569ec..e8e0a3e 100644
--- a/scripts/mcp-environment-preflight.mjs
+++ b/scripts/mcp-environment-preflight.mjs
@@ -64,7 +64,7 @@ try {
     })}\n`);
   });
   const status = response.result?.structuredContent;
-  assert.equal(status?.version, '3.4.2');
+  assert.equal(status?.version, '3.4.3');
   assert.equal(status?.healthy, true, JSON.stringify(status?.local_boundary));
   assert.equal(status?.local_boundary?.ready, true, JSON.stringify(status?.local_boundary));
   assert.equal(status?.local_boundary?.boundary, 'systemd-user-service-cgroup');
diff --git a/scripts/prepare-coengineer-qualification.mjs b/scripts/prepare-coengineer-qualification.mjs
new file mode 100644
index 0000000..3172f2e
--- /dev/null
+++ b/scripts/prepare-coengineer-qualification.mjs
@@ -0,0 +1,2113 @@
+#!/usr/bin/env node
+// Non-provider materialization and offline cohort helper for 3.4.3
+// retrospective qualification. Reuses comparator parsing/accounting primitives
+// without inheriting optional-arm policy or the small-case 16-file parser.
+// Live provider jobs are not implemented.
+
+import { execFile as execFileCallback } from 'node:child_process';
+import { createHash } from 'node:crypto';
+import {
+  mkdir,
+  mkdtemp,
+  readdir,
+  readFile,
+  rm,
+  stat,
+  writeFile,
+} from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { promisify } from 'node:util';
+
+import { canonicalJsonStringify } from '../plugins/codex-co-engineer/mcp/v3/identity.mjs';
+import { PUBLIC_MCP_TOOLS } from '../plugins/codex-co-engineer/mcp/v3/response.mjs';
+import {
+  CASE_GIT_IDENTITY,
+  COENGINEER_ARMS,
+  GIT_EXECUTABLE,
+  aggregateTrials,
+  loadCases,
+  parseTrial,
+} from './compare-coengineer-runs.mjs';
+
+const execFile = promisify(execFileCallback);
+
+export const QUALIFICATION_PROTOCOL_SCHEMA_ID = 'codex-co-engineer.qualification-protocol.v1';
+export const QUALIFICATION_MANIFEST_SCHEMA_ID = 'codex-co-engineer.qualification-manifest.v1';
+export const QUALIFICATION_CASE_SCHEMA_ID = 'codex-co-engineer.qualification-case.v1';
+export const QUALIFICATION_EXECUTION_SCHEMA_ID = 'codex-co-engineer.qualification-execution-manifest.v1';
+export const QUALIFICATION_INPUT_DIGEST_DOMAIN = 'codex-co-engineer.qualification-input.v1';
+export const DEADLINE_SOURCE_SHA = 'dede188029aff117c60e9a8c4299cc0ab0838be9';
+export const PUBLISHED_342_SHA = DEADLINE_SOURCE_SHA;
+export const RESULT_SOURCE_SHA = '3131f9ac7f6807eccb2ab68f027f1d98d3db3661';
+export const PAID_CEILING_USD = 25;
+export const TRIAL_DEADLINE_MS = 60 * 60 * 1000;
+export const MAX_CORRECTIONS = 3;
+export const REPETITIONS = 2;
+export const ORDERING_SEED = 43;
+export const FIVE_TOOLS = Object.freeze(['status', 'delegate', 'task', 'tasks', 'cancel']);
+export const QUALIFICATION_ARMS = Object.freeze([
+  'native-codex',
+  'published-3.4.2',
+  'candidate-3.4.3',
+  'direct-delegation',
+]);
+export const PLACEHOLDER_HOST_MODEL = 'codex-default';
+export const ASTRA_PROVIDER = 'openai';
+export const ASTRA_MODEL = 'gpt-6-astra';
+export const HOST_USAGE_REPORT_SCHEMA_ID = 'codex-co-engineer.host-usage-report.v1';
+export const EVIDENCE_DIGEST_DOMAIN = 'codex-co-engineer.host-usage-evidence.v1';
+const HOST_USAGE_COUNTERS = Object.freeze([
+  'input_tokens',
+  'cached_input_tokens',
+  'cache_write_input_tokens',
+  'output_tokens',
+  'reasoning_output_tokens',
+]);
+const HOST_MODEL_COUNTERS = Object.freeze([...HOST_USAGE_COUNTERS, 'total_tokens']);
+export const ARM_TRIAL_TOKENS = Object.freeze({
+  'native-codex': 'native-codex',
+  'published-3.4.2': 'published-3-4-2',
+  'candidate-3.4.3': 'candidate-3-4-3',
+  'direct-delegation': 'direct-delegation',
+});
+export const TURNAROUND_REDUCTION = 'median of per-trial candidate/native wall ratios paired by case_id and rep; not the ratio of summed wall durations';
+export const OVERHEAD_REDUCTION = 'median of 3 task ratios of candidate native_output_per_accepted / direct native_output_per_accepted';
+export const ASTRA_REDUCTION = 'count gpt-6-astra native output once from host-usage-report.v1 by_model; helpers excluded unless observed as Astra';
+
+const ROOT = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..');
+const QUAL_ROOT = path.join(ROOT, 'benchmarks/qualification');
+const INPUTS_ROOT = path.join(QUAL_ROOT, 'inputs');
+const CASES_ROOT = path.join(QUAL_ROOT, 'cases');
+const PROTOCOL_PATH = path.join(QUAL_ROOT, 'protocol.json');
+const MANIFEST_PATH = path.join(QUAL_ROOT, 'operator-manifest.json');
+const PRECOLLECTION_PATH = path.join(QUAL_ROOT, 'precollection-manifest.json');
+const EXISTING_CASES_ROOT = path.join(ROOT, 'benchmarks/cases');
+const SHA40 = /^[0-9a-f]{40}$/u;
+const SHA256 = /^[0-9a-f]{64}$/u;
+const GIT_TIMEOUT_MS = 30_000;
+const NODE_TEST_TIMEOUT_MS = 90_000;
+const MAX_QUAL_FILES = 80;
+const MAX_QUAL_FILE_BYTES = 1024 * 1024;
+const MAX_PATH_SEGMENTS = 8;
+const QUAL_TRIAL_ID = /^[a-z][a-z0-9-]{1,63}$/u;
+const PROVIDER_ID = /^[a-z][a-z0-9-]{0,63}$/u;
+const MODEL_ID = /^[A-Za-z0-9][A-Za-z0-9._/:-]{0,127}$/u;
+const BOOLEAN_FLAGS = Object.freeze([
+  '--help', '--live', '--validate', '--pack', '--schedule', '--check-known-bad',
+  '--extract-source', '--evaluate-cohort',
+]);
+const VALUE_FLAGS = Object.freeze([
+  '--materialize-case', '--destination', '--case', '--paid-budget',
+  '--trials', '--execution-manifest',
+]);
+
+function fail(code, message) {
+  const error = new Error(message);
+  error.code = code;
+  throw error;
+}
+
+function isPlainObject(value) {
+  return value !== null && typeof value === 'object' && !Array.isArray(value);
+}
+
+function sha256Bytes(bytes) {
+  return createHash('sha256').update(bytes).digest('hex');
+}
+
+export function hostUsageEvidenceDigest(parts) {
+  const hash = createHash('sha256');
+  hash.update(EVIDENCE_DIGEST_DOMAIN);
+  hash.update('\0');
+  for (const part of parts) {
+    const buffer = Buffer.isBuffer(part) ? part : Buffer.from(String(part), 'utf8');
+    hash.update(Buffer.from([0]));
+    hash.update(buffer);
+  }
+  return hash.digest('hex');
+}
+
+export function hostUsageTrialDigest(trial) {
+  return hostUsageEvidenceDigest(['trial', JSON.stringify(trial)]);
+}
+
+function parseOptionalCounter(value, pathLabel) {
+  if (value == null) return null;
+  if (!Number.isSafeInteger(value) || value < 0) {
+    fail('out_of_range', `${pathLabel} must be a non-negative safe integer.`);
+  }
+  return value;
+}
+
+function sumModelCounter(rows, key) {
+  if (rows.length === 0) return 0;
+  let sum = 0;
+  for (const row of rows) {
+    if (row[key] == null) return null;
+    sum += row[key];
+  }
+  return sum;
+}
+
+export const CASE_DEFS = Object.freeze([
+  Object.freeze({
+    id: 'acp-deadline-concurrent-cancel',
+    title: 'Honor deadline extensions and isolate concurrent ACP cancellation',
+    summary: 'In-flight turns must follow the current recorded deadline, and overlapping sessions must not steal cancellation or promote timeout partials into completed end_turn.',
+    source_sha: DEADLINE_SOURCE_SHA,
+    implement: 'cursor-local',
+    review: 'grok',
+    test_file: 'checks/deadline-concurrent.test.mjs',
+    overlay_files: Object.freeze(['TASK.md', 'checks/deadline-concurrent.test.mjs']),
+    primary_paths: Object.freeze([
+      'plugins/codex-co-engineer/mcp/v3/acp-worker.mjs',
+      'plugins/codex-co-engineer/mcp/v3/deadline.mjs',
+    ]),
+    allowlist: Object.freeze([
+      'plugins/codex-co-engineer/assets/acpx-runtime.mjs',
+      'plugins/codex-co-engineer/mcp/v3/acp-worker.mjs',
+      'plugins/codex-co-engineer/mcp/v3/aggregate-run-anchor.mjs',
+      'plugins/codex-co-engineer/mcp/v3/artifact-path.mjs',
+      'plugins/codex-co-engineer/mcp/v3/artifact-reader.mjs',
+      'plugins/codex-co-engineer/mcp/v3/artifact-ref.mjs',
+      'plugins/codex-co-engineer/mcp/v3/artifact-sanitizer.mjs',
+      'plugins/codex-co-engineer/mcp/v3/artifact-store.mjs',
+      'plugins/codex-co-engineer/mcp/v3/assignment-manifest.mjs',
+      'plugins/codex-co-engineer/mcp/v3/attention-batch.mjs',
+      'plugins/codex-co-engineer/mcp/v3/capability-bridge.mjs',
+      'plugins/codex-co-engineer/mcp/v3/compact-task.mjs',
+      'plugins/codex-co-engineer/mcp/v3/contract.mjs',
+      'plugins/codex-co-engineer/mcp/v3/credential-boundary.mjs',
+      'plugins/codex-co-engineer/mcp/v3/cursor-cloud-driver.mjs',
+      'plugins/codex-co-engineer/mcp/v3/cursor-cloud-result-source.mjs',
+      'plugins/codex-co-engineer/mcp/v3/cursor-cloud-worker.mjs',
+      'plugins/codex-co-engineer/mcp/v3/cursor-local-driver.mjs',
+      'plugins/codex-co-engineer/mcp/v3/deadline.mjs',
+      'plugins/codex-co-engineer/mcp/v3/diagnostics.mjs',
+      'plugins/codex-co-engineer/mcp/v3/dsh-acpx-driver.mjs',
+      'plugins/codex-co-engineer/mcp/v3/evidence-bundle.mjs',
+      'plugins/codex-co-engineer/mcp/v3/future-harness.mjs',
+      'plugins/codex-co-engineer/mcp/v3/git-authority.mjs',
+      'plugins/codex-co-engineer/mcp/v3/git-identity.mjs',
+      'plugins/codex-co-engineer/mcp/v3/grammar.mjs',
+      'plugins/codex-co-engineer/mcp/v3/grok-acp-driver.mjs',
+      'plugins/codex-co-engineer/mcp/v3/grok-question-bridge.mjs',
+      'plugins/codex-co-engineer/mcp/v3/identity.mjs',
+      'plugins/codex-co-engineer/mcp/v3/local-provider-result-sink.mjs',
+      'plugins/codex-co-engineer/mcp/v3/mailbox.mjs',
+      'plugins/codex-co-engineer/mcp/v3/process-boundary.mjs',
+      'plugins/codex-co-engineer/mcp/v3/profile.mjs',
+      'plugins/codex-co-engineer/mcp/v3/prompt-compiler.mjs',
+      'plugins/codex-co-engineer/mcp/v3/protected-identity.mjs',
+      'plugins/codex-co-engineer/mcp/v3/protected-telemetry.mjs',
+      'plugins/codex-co-engineer/mcp/v3/provider-driver-conformance.mjs',
+      'plugins/codex-co-engineer/mcp/v3/provider-driver-template.mjs',
+      'plugins/codex-co-engineer/mcp/v3/provider-driver.mjs',
+      'plugins/codex-co-engineer/mcp/v3/provider-registry.mjs',
+      'plugins/codex-co-engineer/mcp/v3/provider-result.mjs',
+      'plugins/codex-co-engineer/mcp/v3/readiness-snapshot.mjs',
+      'plugins/codex-co-engineer/mcp/v3/repo-path-matcher.mjs',
+      'plugins/codex-co-engineer/mcp/v3/resolver.mjs',
+      'plugins/codex-co-engineer/mcp/v3/response.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-admission-store.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-admission.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-artifact-bridge.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-journal.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-manifest.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-orchestration.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-policy.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-preflight.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-reducer.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-request-compiler.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-runtime.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-scheduler.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-store.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-tool-adapter.mjs',
+      'plugins/codex-co-engineer/mcp/v3/runtime-entrypoints.mjs',
+      'plugins/codex-co-engineer/mcp/v3/selection-json.mjs',
+      'plugins/codex-co-engineer/mcp/v3/supervisor.mjs',
+      'plugins/codex-co-engineer/mcp/v3/task-store.mjs',
+      'plugins/codex-co-engineer/mcp/v3/usage-ledger.mjs',
+      'plugins/codex-co-engineer/mcp/v3/worktree-bootstrap-runtime.mjs',
+      'plugins/codex-co-engineer/vendor/worktree-bootstrap/worktree-bootstrap',
+    ]),
+  }),
+  Object.freeze({
+    id: 'run-result-outcome-acceptance',
+    title: 'Keep run-result outcomes distinct from Codex acceptance',
+    summary: 'Completed provider work is not Codex acceptance. Failed, uncertain, and unfinal stay distinct, verify completion is not a passed check, and missing usage stays unknown.',
+    source_sha: RESULT_SOURCE_SHA,
+    implement: 'grok',
+    review: 'cursor-local',
+    test_file: 'checks/run-result-outcome.test.mjs',
+    overlay_files: Object.freeze(['TASK.md', 'checks/run-result-outcome.test.mjs']),
+    primary_paths: Object.freeze([
+      'plugins/codex-co-engineer/mcp/v3/run-result-evidence.mjs',
+      'plugins/codex-co-engineer/mcp/v3/final-decision-card.mjs',
+      'plugins/codex-co-engineer/mcp/v3/usage-ledger.mjs',
+    ]),
+    allowlist: Object.freeze([
+      'plugins/codex-co-engineer/mcp/v3/artifact-path.mjs',
+      'plugins/codex-co-engineer/mcp/v3/artifact-ref.mjs',
+      'plugins/codex-co-engineer/mcp/v3/assignment-manifest.mjs',
+      'plugins/codex-co-engineer/mcp/v3/capability-bridge.mjs',
+      'plugins/codex-co-engineer/mcp/v3/contract.mjs',
+      'plugins/codex-co-engineer/mcp/v3/final-decision-card.mjs',
+      'plugins/codex-co-engineer/mcp/v3/grammar.mjs',
+      'plugins/codex-co-engineer/mcp/v3/identity.mjs',
+      'plugins/codex-co-engineer/mcp/v3/prompt-compiler.mjs',
+      'plugins/codex-co-engineer/mcp/v3/protected-identity.mjs',
+      'plugins/codex-co-engineer/mcp/v3/protected-telemetry.mjs',
+      'plugins/codex-co-engineer/mcp/v3/repo-path-matcher.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-manifest.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-policy.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-result-evidence.mjs',
+      'plugins/codex-co-engineer/mcp/v3/selection-json.mjs',
+      'plugins/codex-co-engineer/mcp/v3/usage-ledger.mjs',
+    ]),
+  }),
+  Object.freeze({
+    id: 'comparison-failed-helper-cumulative',
+    title: 'Count failed attempts, helpers, and compatible cumulative snapshots',
+    summary: 'Failed attempts remain in the usage-per-accepted numerator, helpers are not double-counted, mixed providers stay grouped, and cumulative snapshots cannot overwrite a terminal failure.',
+    source_sha: RESULT_SOURCE_SHA,
+    implement: 'grok',
+    review: 'cursor-local',
+    test_file: 'checks/failed-helper-cumulative.test.mjs',
+    overlay_files: Object.freeze(['TASK.md', 'checks/failed-helper-cumulative.test.mjs']),
+    primary_paths: Object.freeze(['scripts/compare-coengineer-runs.mjs']),
+    allowlist: Object.freeze([
+      'plugins/codex-co-engineer/mcp/v3/assignment-manifest.mjs',
+      'plugins/codex-co-engineer/mcp/v3/contract.mjs',
+      'plugins/codex-co-engineer/mcp/v3/grammar.mjs',
+      'plugins/codex-co-engineer/mcp/v3/identity.mjs',
+      'plugins/codex-co-engineer/mcp/v3/prompt-compiler.mjs',
+      'plugins/codex-co-engineer/mcp/v3/repo-path-matcher.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-manifest.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-policy.mjs',
+      'scripts/compare-coengineer-runs.mjs',
+    ]),
+  }),
+]);
+
+export const CASE_IDS = Object.freeze(CASE_DEFS.map((entry) => entry.id));
+
+function caseDef(id) {
+  const found = CASE_DEFS.find((entry) => entry.id === id);
+  if (!found) fail('unknown_case', `Unknown qualification case ${id}.`);
+  return found;
+}
+
+export function assertQualificationPath(rel, pathLabel = 'path') {
+  if (typeof rel !== 'string' || rel.length === 0 || rel.length > 240) {
+    fail('invalid_format', `${pathLabel} is not a safe relative path.`);
+  }
+  if (rel.startsWith('/') || rel.includes('\\') || rel.includes('\0')) {
+    fail('invalid_format', `${pathLabel} is not a safe relative path.`);
+  }
+  const parts = rel.split('/');
+  if (parts.length > MAX_PATH_SEGMENTS) {
+    fail('bounds_exceeded', `${pathLabel} exceeds ${MAX_PATH_SEGMENTS} path segments.`);
+  }
+  for (const part of parts) {
+    if (part === '.' || part === '..' || part === '.git' || part.length === 0) {
+      fail('invalid_format', `${pathLabel} is not a safe relative path.`);
+    }
+  }
+  return rel;
+}
+
+async function runGit(cwd, args, { encoding = 'utf8', maxBuffer = 2 * 1024 * 1024 } = {}) {
+  const env = {
+    PATH: process.env.PATH ?? '/usr/bin:/bin',
+    TMPDIR: os.tmpdir(),
+    GIT_CONFIG_NOSYSTEM: '1',
+    GIT_CONFIG_GLOBAL: '/dev/null',
+    GIT_CONFIG_SYSTEM: '/dev/null',
+    GIT_AUTHOR_NAME: CASE_GIT_IDENTITY.name,
+    GIT_AUTHOR_EMAIL: CASE_GIT_IDENTITY.email,
+    GIT_AUTHOR_DATE: CASE_GIT_IDENTITY.date,
+    GIT_COMMITTER_NAME: CASE_GIT_IDENTITY.name,
+    GIT_COMMITTER_EMAIL: CASE_GIT_IDENTITY.email,
+    GIT_COMMITTER_DATE: CASE_GIT_IDENTITY.date,
+    GIT_TERMINAL_PROMPT: '0',
+    GIT_OPTIONAL_LOCKS: '0',
+    LANG: 'C',
+    LC_ALL: 'C',
+  };
+  try {
+    const result = await execFile(GIT_EXECUTABLE, args, {
+      cwd,
+      env,
+      timeout: GIT_TIMEOUT_MS,
+      maxBuffer,
+      encoding,
+    });
+    return result.stdout;
+  } catch (error) {
+    const stderr = error instanceof Error ? String(error.stderr ?? error.message) : String(error);
+    fail('git_execution_failed', `git ${args.join(' ')} failed: ${stderr.trim()}`);
+  }
+}
+
+export async function resolveCommit(sha) {
+  if (typeof sha !== 'string' || !SHA40.test(sha)) {
+    fail('invalid_format', 'Commit identity must be a 40-character SHA.');
+  }
+  const resolved = String(await runGit(ROOT, ['rev-parse', '--verify', `${sha}^{commit}`])).trim();
+  if (resolved !== sha) {
+    fail('stale_identity', `Resolved commit ${resolved} does not match recorded SHA ${sha}.`);
+  }
+  return resolved;
+}
+
+export async function readGitBytes(sha, rel) {
+  assertQualificationPath(rel, rel);
+  await resolveCommit(sha);
+  const bytes = await runGit(ROOT, ['show', `${sha}:${rel}`], { encoding: 'buffer' });
+  if (!Buffer.isBuffer(bytes)) fail('git_execution_failed', `git show ${sha}:${rel} did not return bytes.`);
+  if (bytes.length > MAX_QUAL_FILE_BYTES) {
+    fail('bounds_exceeded', `${rel} exceeds ${MAX_QUAL_FILE_BYTES} bytes.`);
+  }
+  return bytes;
+}
+
+export function mulberry32(seed) {
+  let a = seed >>> 0;
+  return () => {
+    a = (a + 0x6D2B79F5) >>> 0;
+    let t = a;
+    t = Math.imul(t ^ (t >>> 15), t | 1);
+    t ^= t + Math.imul(t ^ (t >>> 7), t | 61);
+    return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
+  };
+}
+
+function fisherYates(items, rng) {
+  const arr = items.slice();
+  for (let i = arr.length - 1; i > 0; i -= 1) {
+    const j = Math.floor(rng() * (i + 1));
+    const swap = arr[i];
+    arr[i] = arr[j];
+    arr[j] = swap;
+  }
+  return arr;
+}
+
+export function seededShuffle(items, seed) {
+  return fisherYates(items, mulberry32(seed));
+}
+
+export function qualificationTrialId(caseId, arm, rep) {
+  const token = ARM_TRIAL_TOKENS[arm];
+  if (token == null) fail('invalid_format', `Unknown qualification arm ${arm}.`);
+  const trialId = `${caseId}-${token}-r${rep}`;
+  if (!QUAL_TRIAL_ID.test(trialId)) {
+    fail('invalid_format', `Qualification trial id ${trialId} is not hyphen-only.`);
+  }
+  return trialId;
+}
+
+function plannedTrial(id, arm, rep) {
+  const def = caseDef(id);
+  return {
+    trial_id: qualificationTrialId(id, arm, rep),
+    case_id: id,
+    arm,
+    rep,
+    implement: arm === 'native-codex' ? 'native' : def.implement,
+    review: arm === 'native-codex' ? null : def.review,
+    status: 'unrun',
+    retrospective: true,
+  };
+}
+
+export function generateSchedule(seed = ORDERING_SEED) {
+  const canonical = [];
+  const groups = [];
+  for (const id of CASE_IDS) {
+    for (let rep = 1; rep <= REPETITIONS; rep += 1) {
+      const group = QUALIFICATION_ARMS.map((arm) => plannedTrial(id, arm, rep));
+      groups.push(group);
+      canonical.push(...group);
+    }
+  }
+  const rng = mulberry32(seed);
+  const ordered = fisherYates(groups, rng)
+    .map((group) => fisherYates(group, rng))
+    .flat();
+  const armCounts = Object.fromEntries(QUALIFICATION_ARMS.map((arm) => [
+    arm,
+    canonical.filter((row) => row.arm === arm).length,
+  ]));
+  if (canonical.length !== 24 || new Set(canonical.map((row) => row.trial_id)).size !== 24) {
+    fail('identity_mismatch', 'Planned identities must be exactly 24 unique hyphen-only trial ids.');
+  }
+  if (Object.values(armCounts).some((count) => count !== 6) || new Set(canonical.map((row) => row.case_id)).size !== 3) {
+    fail('identity_mismatch', 'Schedule must cover 3 distinct cases and exactly 6 trials per arm.');
+  }
+  const firstGroup = ordered.slice(0, 4);
+  if (new Set(firstGroup.map((row) => `${row.case_id}:${row.rep}`)).size !== 1
+    || new Set(firstGroup.map((row) => row.arm)).size !== 4) {
+    fail('identity_mismatch', 'Seeded ordering must start with one matched group of 4 same task/rep arms.');
+  }
+  return {
+    seed,
+    algorithm: 'mulberry32-fisher-yates-grouped-by-case-rep-then-approach-positions',
+    trial_count: canonical.length,
+    canonical,
+    ordered,
+  };
+}
+
+async function readOverlayFiles(id) {
+  const def = caseDef(id);
+  const dir = path.join(INPUTS_ROOT, id);
+  const files = {};
+  async function walk(current, prefix) {
+    const entries = await readdir(current, { withFileTypes: true });
+    for (const entry of entries) {
+      if (entry.name.startsWith('.')) continue;
+      const rel = prefix ? `${prefix}/${entry.name}` : entry.name;
+      const full = path.join(current, entry.name);
+      if (entry.isDirectory()) {
+        await walk(full, rel);
+        continue;
+      }
+      assertQualificationPath(rel, `${id}/${rel}`);
+      files[rel] = await readFile(full, 'utf8');
+    }
+  }
+  await walk(dir, '');
+  for (const required of def.overlay_files) {
+    if (!Object.hasOwn(files, required)) {
+      fail('missing_key', `${id} is missing required overlay ${required}.`);
+    }
+  }
+  const extras = Object.keys(files).filter((name) => !def.overlay_files.includes(name));
+  if (extras.length > 0) {
+    fail('scope_violation', `${id} overlay contains unexpected ${extras[0]}.`);
+  }
+  return files;
+}
+
+export function computeQualificationInputDigest({ sourceSha, allowlist, overlay, acceptance }) {
+  const canonical = canonicalJsonStringify({
+    source_sha: sourceSha,
+    allowlist,
+    overlay,
+    acceptance,
+  });
+  return createHash('sha256')
+    .update(QUALIFICATION_INPUT_DIGEST_DOMAIN, 'utf8')
+    .update('\n', 'utf8')
+    .update(canonical, 'utf8')
+    .digest('hex');
+}
+
+export function computeCheckDigest(acceptance) {
+  return createHash('sha256')
+    .update('codex-co-engineer.qualification-check.v1', 'utf8')
+    .update('\n', 'utf8')
+    .update(canonicalJsonStringify(acceptance), 'utf8')
+    .digest('hex');
+}
+
+export async function measureAllowlist(def) {
+  if (def.allowlist.length < 1 || def.allowlist.length > MAX_QUAL_FILES) {
+    fail('bounds_exceeded', `${def.id} allowlist must contain 1..${MAX_QUAL_FILES} files.`);
+  }
+  const measured = [];
+  for (const rel of def.allowlist) {
+    assertQualificationPath(rel, rel);
+    const bytes = await readGitBytes(def.source_sha, rel);
+    measured.push({
+      path: rel,
+      git_sha256: sha256Bytes(bytes),
+      bytes: bytes.length,
+    });
+  }
+  return measured;
+}
+
+function qualificationAcceptance(def) {
+  return {
+    checks: [{
+      id: 'unit',
+      command: ['node', '--test', def.test_file],
+      expect_exit: 0,
+    }],
+    required_files: [...def.overlay_files, ...def.primary_paths],
+    forbidden_paths: [...def.overlay_files],
+  };
+}
+
+export function scanOverlayLeakage(files) {
+  const leaks = [];
+  for (const [rel, text] of Object.entries(files)) {
+    const haystack = `${rel}\n${text}`;
+    if (haystack.includes('solution.mjs')) leaks.push({ path: rel, marker: 'solution.mjs' });
+    if (/\bAsyncLocalStorage\b/u.test(haystack)) leaks.push({ path: rel, marker: 'AsyncLocalStorage' });
+    if (/\btimeoutMs:\s*0\b/u.test(haystack) && rel.endsWith('.mjs')) {
+      leaks.push({ path: rel, marker: 'timeoutMs:0' });
+    }
+  }
+  if (leaks.length > 0) {
+    fail('solution_leakage', `Worker overlay leaks reference material: ${leaks[0].marker}.`);
+  }
+  return true;
+}
+
+export function scanWorkerLeakage(files) {
+  return scanOverlayLeakage(files);
+}
+
+export async function listRelativeFiles(rootDir) {
+  const out = [];
+  async function walk(current, prefix) {
+    const entries = await readdir(current, { withFileTypes: true });
+    for (const entry of entries) {
+      if (entry.name === '.git') continue;
+      const rel = prefix ? `${prefix}/${entry.name}` : entry.name;
+      const full = path.join(current, entry.name);
+      if (entry.isDirectory()) await walk(full, rel);
+      else out.push(rel);
+    }
+  }
+  await walk(rootDir, '');
+  return out.sort();
+}
+
+async function assertEmptyDestination(destination) {
+  try {
+    const info = await stat(destination);
+    if (!info.isDirectory()) fail('invalid_type', 'destination must be an empty directory.');
+    const names = await readdir(destination);
+    if (names.length > 0) fail('destination_not_empty', 'destination must be empty.');
+  } catch (error) {
+    if (error && typeof error === 'object' && error.code === 'ENOENT') {
+      await mkdir(destination, { recursive: true });
+      return;
+    }
+    throw error;
+  }
+}
+
+async function writeRelativeFile(dest, rel, contents) {
+  assertQualificationPath(rel, rel);
+  const target = path.join(dest, rel);
+  const resolved = path.resolve(target);
+  if (resolved !== target || !resolved.startsWith(`${dest}${path.sep}`)) {
+    fail('scope_violation', `${rel} escapes the destination.`);
+  }
+  await mkdir(path.dirname(target), { recursive: true });
+  const base = path.posix.basename(rel);
+  const mode = base.includes('.') ? 0o644 : 0o755;
+  if (Buffer.isBuffer(contents)) {
+    await writeFile(target, contents, { mode });
+  } else {
+    await writeFile(target, contents, { encoding: 'utf8', mode });
+  }
+}
+
+async function commitMaterializedTree(dest, caseId) {
+  await runGit(dest, ['-c', 'init.defaultBranch=main', 'init', '--initial-branch=main']);
+  await runGit(dest, [
+    '-c', 'core.autocrlf=false',
+    '-c', 'core.eol=lf',
+    '-c', 'core.safecrlf=false',
+    'add', '-A',
+  ]);
+  await runGit(dest, [
+    '-c', `user.name=${CASE_GIT_IDENTITY.name}`,
+    '-c', `user.email=${CASE_GIT_IDENTITY.email}`,
+    '-c', 'commit.gpgsign=false',
+    'commit', '--no-gpg-sign', '-m', `${QUALIFICATION_CASE_SCHEMA_ID}:${caseId}`,
+  ]);
+  const head = String(await runGit(dest, ['rev-parse', 'HEAD'])).trim();
+  if (!SHA40.test(head)) fail('git_execution_failed', 'materialized HEAD is not a 40-character SHA.');
+  return head;
+}
+
+export async function materializeHistoricalFiles(def, destination, { overlay = {}, expectedAllowlist = null } = {}) {
+  const dest = path.resolve(destination);
+  await assertEmptyDestination(dest);
+  const source = await resolveCommit(def.source_sha);
+  const writtenAllowlist = [];
+  for (const rel of def.allowlist) {
+    const bytes = await readGitBytes(source, rel);
+    const digest = sha256Bytes(bytes);
+    if (expectedAllowlist != null) {
+      const recorded = expectedAllowlist.find((entry) => entry.path === rel);
+      if (recorded == null) fail('stale_identity', `${rel} is not in the frozen allowlist.`);
+      if (recorded.git_sha256 !== digest || recorded.bytes !== bytes.length) {
+        fail('stale_identity', `${rel} git bytes do not match the frozen allowlist digest.`);
+      }
+    }
+    await writeRelativeFile(dest, rel, bytes);
+    writtenAllowlist.push(rel);
+  }
+  for (const [rel, text] of Object.entries(overlay)) {
+    if (def.allowlist.includes(rel)) {
+      fail('scope_violation', `Overlay ${rel} collides with historical source.`);
+    }
+    await writeRelativeFile(dest, rel, text);
+  }
+  const written = await listRelativeFiles(dest);
+  const expected = [...def.allowlist, ...Object.keys(overlay)].sort();
+  if (written.join('\n') !== expected.join('\n')) {
+    fail('scope_violation', `Materialized files escape frozen allowlist and overlay.`);
+  }
+  return { destination: dest, source_sha: source, files: written };
+}
+
+export async function materializeQualificationCase(record, destination) {
+  const parsed = parseQualificationCase(record);
+  scanOverlayLeakage(parsed.overlay);
+  const dest = path.resolve(destination);
+  const materialized = await materializeHistoricalFiles(caseDef(parsed.id), dest, {
+    overlay: parsed.overlay,
+    expectedAllowlist: parsed.allowlist,
+  });
+  const baseSha = await commitMaterializedTree(dest, parsed.id);
+  if (parsed.base_sha != null && parsed.base_sha !== baseSha) {
+    fail('stale_identity', `Materialized base SHA ${baseSha} does not match recorded ${parsed.base_sha}.`);
+  }
+  if (parsed.input_digest !== computeQualificationInputDigest({
+    sourceSha: parsed.source_sha,
+    allowlist: parsed.allowlist,
+    overlay: parsed.overlay,
+    acceptance: parsed.acceptance,
+  })) {
+    fail('stale_identity', 'input_digest does not match frozen files and acceptance checks.');
+  }
+  return {
+    case_id: parsed.id,
+    destination: dest,
+    base_sha: baseSha,
+    input_digest: parsed.input_digest,
+    source_sha: parsed.source_sha,
+    git_identity: { ...CASE_GIT_IDENTITY, message: `${QUALIFICATION_CASE_SCHEMA_ID}:${parsed.id}` },
+  };
+}
+
+export function parseQualificationCase(value, pathLabel = 'case') {
+  if (!isPlainObject(value)) fail('invalid_type', `${pathLabel} must be a JSON object.`);
+  if (value.schema !== QUALIFICATION_CASE_SCHEMA_ID) fail('invalid_format', `${pathLabel}.schema`);
+  const id = value.id;
+  const def = caseDef(id);
+  if (value.source_sha !== def.source_sha) {
+    fail('stale_identity', `${id} source SHA is not the recorded pre-fix identity.`);
+  }
+  if (!Array.isArray(value.allowlist) || value.allowlist.length !== def.allowlist.length) {
+    fail('identity_mismatch', `${id} allowlist does not match the frozen path list.`);
+  }
+  const allowlist = value.allowlist.map((entry, index) => {
+    if (!isPlainObject(entry)) fail('invalid_type', `${pathLabel}.allowlist[${index}]`);
+    const rel = assertQualificationPath(entry.path, `${pathLabel}.allowlist[${index}].path`);
+    if (rel !== def.allowlist[index]) {
+      fail('identity_mismatch', `${id} allowlist path order does not match the frozen list.`);
+    }
+    if (typeof entry.git_sha256 !== 'string' || !SHA256.test(entry.git_sha256)) {
+      fail('invalid_format', `${pathLabel}.allowlist[${index}].git_sha256`);
+    }
+    if (!Number.isSafeInteger(entry.bytes) || entry.bytes < 1 || entry.bytes > MAX_QUAL_FILE_BYTES) {
+      fail('out_of_range', `${pathLabel}.allowlist[${index}].bytes`);
+    }
+    return { path: rel, git_sha256: entry.git_sha256, bytes: entry.bytes };
+  });
+  if (!isPlainObject(value.overlay) || !isPlainObject(value.overlay.files)) {
+    fail('invalid_type', `${pathLabel}.overlay.files`);
+  }
+  const overlay = {};
+  for (const rel of def.overlay_files) {
+    const text = value.overlay.files[rel];
+    if (typeof text !== 'string' || text.length === 0) {
+      fail('missing_key', `${pathLabel}.overlay.files.${rel}`);
+    }
+    overlay[rel] = text;
+  }
+  if (Object.keys(value.overlay.files).sort().join('\n') !== [...def.overlay_files].sort().join('\n')) {
+    fail('identity_mismatch', `${id} overlay files do not match the frozen overlay list.`);
+  }
+  const acceptance = value.acceptance;
+  if (!isPlainObject(acceptance) || !Array.isArray(acceptance.checks) || acceptance.checks.length < 1) {
+    fail('invalid_format', `${pathLabel}.acceptance`);
+  }
+  const inputDigest = computeQualificationInputDigest({
+    sourceSha: def.source_sha,
+    allowlist,
+    overlay,
+    acceptance,
+  });
+  if (typeof value.input_digest === 'string') {
+    if (!SHA256.test(value.input_digest) || value.input_digest !== inputDigest) {
+      fail('stale_identity', `${pathLabel}.input_digest does not match frozen files and acceptance checks.`);
+    }
+  }
+  let baseSha = null;
+  if (Object.hasOwn(value, 'base_sha') && value.base_sha != null) {
+    if (typeof value.base_sha !== 'string' || !SHA40.test(value.base_sha)) {
+      fail('invalid_format', `${pathLabel}.base_sha`);
+    }
+    baseSha = value.base_sha;
+  }
+  if (value.retrospective !== true || value.status !== 'unrun') {
+    fail('identity_mismatch', `${id} must remain an unrun retrospective case.`);
+  }
+  if (Object.hasOwn(value, 'candidate_sha')) {
+    fail('stale_identity', 'Tracked qualification cases must not bind a future candidate SHA.');
+  }
+  if (value.comparable != null) {
+    const hostModel = value.comparable.host_model;
+    if (hostModel === PLACEHOLDER_HOST_MODEL) {
+      fail('identity_mismatch', 'codex-default placeholders are not comparable truth.');
+    }
+  }
+  return {
+    schema: QUALIFICATION_CASE_SCHEMA_ID,
+    id,
+    title: def.title,
+    summary: def.summary,
+    source_sha: def.source_sha,
+    allowlist,
+    overlay,
+    acceptance,
+    input_digest: inputDigest,
+    check_digest: computeCheckDigest(acceptance),
+    base_sha: baseSha,
+    implement: def.implement,
+    review: def.review,
+    retrospective: true,
+    status: 'unrun',
+  };
+}
+
+export function parseQualificationTrial(value, pathLabel = 'trial') {
+  if (!isPlainObject(value)) fail('invalid_type', `${pathLabel} must be a JSON object.`);
+  const trialId = value.trial_id;
+  if (typeof trialId !== 'string' || !QUAL_TRIAL_ID.test(trialId)) {
+    fail('invalid_format', `${pathLabel}.trial_id is not a hyphen-only qualification trial identity.`);
+  }
+  return parseTrial(value, pathLabel);
+}
+
+export async function assertFreshIdentity(record) {
+  const parsed = parseQualificationCase(record);
+  const source = await resolveCommit(parsed.source_sha);
+  if (source !== caseDef(parsed.id).source_sha) {
+    fail('stale_identity', `${parsed.id} source SHA ${source} is not the recorded pre-fix identity.`);
+  }
+  const measured = await measureAllowlist(caseDef(parsed.id));
+  for (let index = 0; index < measured.length; index += 1) {
+    if (measured[index].git_sha256 !== parsed.allowlist[index].git_sha256) {
+      fail('stale_identity', `${parsed.allowlist[index].path} git bytes do not match the frozen digest.`);
+    }
+  }
+  return { source_sha: source, input_digest: parsed.input_digest };
+}
+
+export async function buildCaseRecord(id, { baseSha = null } = {}) {
+  const def = caseDef(id);
+  const overlay = await readOverlayFiles(id);
+  scanOverlayLeakage(overlay);
+  const allowlist = await measureAllowlist(def);
+  const acceptance = qualificationAcceptance(def);
+  const inputDigest = computeQualificationInputDigest({
+    sourceSha: def.source_sha,
+    allowlist,
+    overlay,
+    acceptance,
+  });
+  const record = {
+    schema: QUALIFICATION_CASE_SCHEMA_ID,
+    id: def.id,
+    title: def.title,
+    summary: def.summary,
+    input_digest: inputDigest,
+    check_digest: computeCheckDigest(acceptance),
+    source_sha: def.source_sha,
+    retrospective: true,
+    status: 'unrun',
+    implement: def.implement,
+    review: def.review,
+    allowlist,
+    overlay: { files: overlay },
+    acceptance,
+  };
+  if (baseSha != null) record.base_sha = baseSha;
+  parseQualificationCase(record);
+  return record;
+}
+
+export async function packCase(id) {
+  const partial = await buildCaseRecord(id);
+  const tmp = await mkdtemp(path.join(os.tmpdir(), `ce-qual-pack-${id}-`));
+  try {
+    const materialized = await materializeQualificationCase(partial, tmp);
+    const packed = await buildCaseRecord(id, { baseSha: materialized.base_sha });
+    parseQualificationCase(packed);
+    await assertFreshIdentity(packed);
+    return packed;
+  } finally {
+    await rm(tmp, { recursive: true, force: true });
+  }
+}
+
+export async function writePackedCases() {
+  await mkdir(CASES_ROOT, { recursive: true });
+  const packed = [];
+  for (const id of CASE_IDS) {
+    const record = await packCase(id);
+    await writeFile(
+      path.join(CASES_ROOT, `${id}.json`),
+      `${JSON.stringify(record, null, 2)}\n`,
+      'utf8',
+    );
+    packed.push(record);
+  }
+  return packed;
+}
+
+export async function loadQualificationCases() {
+  const raw = [];
+  for (const id of CASE_IDS) {
+    const text = await readFile(path.join(CASES_ROOT, `${id}.json`), 'utf8');
+    const record = JSON.parse(text);
+    parseQualificationCase(record);
+    await assertFreshIdentity(record);
+    raw.push(record);
+  }
+  return { raw };
+}
+
+export async function extractSource({ caseId, destination, sha = null }) {
+  const def = caseDef(caseId);
+  const requested = sha ?? def.source_sha;
+  const source = await resolveCommit(requested);
+  if (source !== def.source_sha) {
+    fail('stale_identity', `Refusing to extract ${source}; case ${caseId} is bound to ${def.source_sha}.`);
+  }
+  const dest = path.resolve(destination);
+  await materializeHistoricalFiles(def, dest);
+  return {
+    case_id: caseId,
+    source_sha: source,
+    destination: dest,
+    files: [...def.allowlist],
+    worker_context: false,
+    contains_solution: false,
+  };
+}
+
+export async function runFrozenCheck(cwd, command) {
+  try {
+    await execFile(command[0], command.slice(1), {
+      cwd,
+      timeout: NODE_TEST_TIMEOUT_MS,
+      env: {
+        PATH: process.env.PATH ?? '/usr/bin:/bin',
+        TMPDIR: os.tmpdir(),
+        LANG: 'C',
+        LC_ALL: 'C',
+      },
+      maxBuffer: 1024 * 1024,
+    });
+    return { code: 0, stderr: '', stdout: '' };
+  } catch (error) {
+    return {
+      code: Number.isInteger(error.status) ? error.status : 1,
+      stderr: String(error.stderr ?? ''),
+      stdout: String(error.stdout ?? ''),
+    };
+  }
+}
+
+export async function checkKnownBad(record) {
+  const root = await mkdtemp(path.join(os.tmpdir(), `ce-qual-bad-${record.id}-`));
+  try {
+    await materializeQualificationCase(record, root);
+    const command = record.acceptance.checks[0].command;
+    const result = await runFrozenCheck(root, command);
+    if (result.code === 0) {
+      fail('known_bad_passed', `${record.id} acceptance unexpectedly passed on the known-bad source.`);
+    }
+    return { case_id: record.id, failed: true, exit: result.code };
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+}
+
+export async function checkReferencePrivately(record, candidateSha) {
+  const def = caseDef(record.id);
+  const root = await mkdtemp(path.join(os.tmpdir(), `ce-qual-ref-${record.id}-`));
+  try {
+    await assertEmptyDestination(root);
+    for (const rel of def.allowlist) {
+      let bytes;
+      try {
+        bytes = await readGitBytes(candidateSha, rel);
+      } catch {
+        bytes = await readGitBytes(def.source_sha, rel);
+      }
+      await writeRelativeFile(root, rel, bytes);
+    }
+    const overlay = record.overlay?.files ?? parseQualificationCase(record).overlay;
+    for (const [rel, text] of Object.entries(overlay)) {
+      await writeRelativeFile(root, rel, text);
+    }
+    const result = await runFrozenCheck(root, record.acceptance.checks[0].command);
+    return { case_id: record.id, exit: result.code, worker_context: false };
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+}
+
+export function freezeThresholds() {
+  return {
+    candidate_accepted: '6/6',
+    task_median_native_output_per_accepted_vs_native_max: 0.5,
+    task_median_native_output_per_accepted_vs_published_342_max: 0.75,
+    astra_own_output_decreases_vs_published_342: true,
+    median_turnaround_vs_native_max: 2,
+    native_overhead_vs_direct_max: 1.25,
+    failed_attempts_in_numerator: true,
+    missing_primary_evidence: 'inconclusive',
+    paid_ceiling_usd: PAID_CEILING_USD,
+    max_corrections: MAX_CORRECTIONS,
+    entire_trial_deadline_ms: TRIAL_DEADLINE_MS,
+    turnaround_reduction: TURNAROUND_REDUCTION,
+    native_overhead_reduction: OVERHEAD_REDUCTION,
+    astra_own_output_reduction: ASTRA_REDUCTION,
+  };
+}
+
+export function protocolRecord() {
+  const schedule = generateSchedule();
+  return {
+    schema: QUALIFICATION_PROTOCOL_SCHEMA_ID,
+    version: 1,
+    title: 'Codex-Co-Engineer 3.4.3 retrospective qualification protocol',
+    status: 'unrun',
+    arms: {
+      required: [...QUALIFICATION_ARMS],
+      optional: [],
+    },
+    approaches: [...QUALIFICATION_ARMS],
+    cases: CASE_IDS.map((id) => {
+      const def = caseDef(id);
+      return {
+        id,
+        status: 'unrun',
+        retrospective: true,
+        source_sha: def.source_sha,
+        implement: def.implement,
+        review: def.review,
+      };
+    }),
+    repetitions: REPETITIONS,
+    trial_count: schedule.trial_count,
+    planned_identities: 24,
+    ordering: {
+      seed: ORDERING_SEED,
+      algorithm: schedule.algorithm,
+      first_matched_group: 'same-case-and-rep-all-four-arms',
+    },
+    deadline: {
+      entire_trial_ms: TRIAL_DEADLINE_MS,
+      max_corrections: MAX_CORRECTIONS,
+    },
+    paid_ceiling_usd: PAID_CEILING_USD,
+    live_jobs: 'not_implemented',
+    execution_identity: {
+      bound_in: 'external_execution_manifest',
+      host_placeholders_forbidden: true,
+      candidate_sha_not_tracked_here: true,
+    },
+    freeze_thresholds: freezeThresholds(),
+    accounting: {
+      failed_attempts_in_numerator: true,
+      missing_primary_evidence: 'inconclusive',
+      reuse_offline_comparator_parsing: true,
+      task_median_not_pooled: true,
+      helpers_in_total_not_astra_unless_astra: true,
+      all_four_approaches_required: true,
+      routes_bound_per_case: true,
+      turnaround_reduction: TURNAROUND_REDUCTION,
+      native_overhead_reduction: OVERHEAD_REDUCTION,
+      astra_own_output_reduction: ASTRA_REDUCTION,
+    },
+    safeguards: {
+      public_mcp_tools: [...FIVE_TOOLS],
+      do_not_run_release_gate: true,
+      do_not_publish: true,
+      do_not_mutate_baseline_or_candidate_outside_worktree: true,
+      no_live_jobs_in_helper: true,
+    },
+  };
+}
+
+export function operatorManifest() {
+  const schedule = generateSchedule();
+  return {
+    schema: QUALIFICATION_MANIFEST_SCHEMA_ID,
+    version: 1,
+    status: 'unrun',
+    title: 'Operator schedule for 3.4.3 retrospective qualification',
+    note: 'All 24 trials are unrun retrospective cases. Do not treat this manifest as measured evidence. Candidate and published SHAs are bound in the external execution manifest, not here.',
+    assignments: Object.fromEntries(CASE_DEFS.map((def) => [def.id, {
+      implement: { provider: def.implement },
+      review: { provider: def.review },
+    }])),
+    paid_ceiling_usd: PAID_CEILING_USD,
+    live_jobs: 'not_implemented',
+    ordering: {
+      seed: ORDERING_SEED,
+      algorithm: schedule.algorithm,
+      trial_count: schedule.trial_count,
+    },
+    schedule: schedule.ordered,
+    unrun_case_ids: [...CASE_IDS],
+  };
+}
+
+export function precollectionManifestTemplate() {
+  return {
+    schema: QUALIFICATION_EXECUTION_SCHEMA_ID,
+    version: 1,
+    status: 'unrecorded',
+    note: 'Record actual Astra host model gpt-6-astra, effective settings, and exact per-case {provider,model} routes before collection. Native has no external jobs but uses the same planned host config. Never invent backend IDs. Bind immutable candidate commit SHA and tree SHA, published 3.4.2 SHA, and frozen input/check digests here so later results cannot change tracked files. Do not omit candidate.tree.',
+    candidate: null,
+    published_3_4_2: null,
+    host: null,
+    astra: null,
+    provider_configuration: null,
+    approaches: {
+      'native-codex': { external_jobs: false },
+      'published-3.4.2': { external_jobs: true },
+      'candidate-3.4.3': { external_jobs: true },
+      'direct-delegation': { external_jobs: true },
+    },
+    input_digests: {},
+    check_digests: {},
+  };
+}
+
+export async function writeProtocolAndManifest() {
+  await mkdir(QUAL_ROOT, { recursive: true });
+  await writeFile(PROTOCOL_PATH, `${JSON.stringify(protocolRecord(), null, 2)}\n`, 'utf8');
+  await writeFile(MANIFEST_PATH, `${JSON.stringify(operatorManifest(), null, 2)}\n`, 'utf8');
+  await writeFile(PRECOLLECTION_PATH, `${JSON.stringify(precollectionManifestTemplate(), null, 2)}\n`, 'utf8');
+}
+
+function settingsDigest(settings) {
+  return canonicalJsonStringify(settings);
+}
+
+function ownSha(value, pathLabel) {
+  if (typeof value !== 'string' || !SHA40.test(value)) {
+    fail('invalid_format', `${pathLabel} must be a 40-character SHA.`);
+  }
+  return value;
+}
+
+function ownDigest(value, pathLabel) {
+  if (typeof value !== 'string' || !SHA256.test(value)) {
+    fail('invalid_format', `${pathLabel} must be a 64-character SHA-256 digest.`);
+  }
+  return value;
+}
+
+function parseProviderModel(value, pathLabel, expectedProvider = null) {
+  if (!isPlainObject(value)) {
+    fail('invalid_type', `${pathLabel} must be a {provider, model} object.`);
+  }
+  const extra = Object.keys(value).filter((key) => key !== 'provider' && key !== 'model');
+  if (extra.length > 0) fail('unknown_key', `${pathLabel}.${extra[0]}`);
+  const provider = value.provider;
+  const model = value.model;
+  if (typeof provider !== 'string' || !PROVIDER_ID.test(provider)) {
+    fail('invalid_format', `${pathLabel}.provider`);
+  }
+  if (typeof model !== 'string' || !MODEL_ID.test(model)) {
+    fail('invalid_format', `${pathLabel}.model`);
+  }
+  if (expectedProvider != null && provider !== expectedProvider) {
+    fail('identity_mismatch', `${pathLabel}.provider must be ${expectedProvider}.`);
+  }
+  return { provider, model };
+}
+
+function parseCaseRoutes(value, pathLabel) {
+  if (!isPlainObject(value)) fail('invalid_type', `${pathLabel} must be a JSON object.`);
+  const expectedIds = [...CASE_IDS].sort().join(',');
+  if (Object.keys(value).sort().join(',') !== expectedIds) {
+    fail('identity_mismatch', `${pathLabel} must bind exact routes for all three cases.`);
+  }
+  const routes = {};
+  for (const def of CASE_DEFS) {
+    const row = value[def.id];
+    if (!isPlainObject(row)) fail('missing_key', `${pathLabel}.${def.id}`);
+    routes[def.id] = {
+      implement: parseProviderModel(row.implement, `${pathLabel}.${def.id}.implement`, def.implement),
+      review: parseProviderModel(row.review, `${pathLabel}.${def.id}.review`, def.review),
+    };
+  }
+  return routes;
+}
+
+function parseBoundDigests(value, pathLabel) {
+  if (!isPlainObject(value)) fail('missing_key', pathLabel);
+  const expectedIds = [...CASE_IDS].sort().join(',');
+  if (Object.keys(value).sort().join(',') !== expectedIds) {
+    fail('identity_mismatch', `${pathLabel} must record every frozen case digest.`);
+  }
+  const out = {};
+  for (const id of CASE_IDS) {
+    out[id] = ownDigest(value[id], `${pathLabel}.${id}`);
+  }
+  return out;
+}
+
+export function parseExecutionManifest(value, pathLabel = 'execution_manifest') {
+  if (!isPlainObject(value)) fail('invalid_type', `${pathLabel} must be a JSON object.`);
+  if (value.schema !== QUALIFICATION_EXECUTION_SCHEMA_ID) fail('invalid_format', `${pathLabel}.schema`);
+  const status = value.status;
+  if (status !== 'unrecorded' && status !== 'recorded') {
+    fail('invalid_format', `${pathLabel}.status`);
+  }
+  if (status === 'unrecorded') {
+    if (value.candidate != null || value.host != null || value.astra != null) {
+      fail('identity_mismatch', 'Unrecorded execution manifest must not invent identities.');
+    }
+    return { status, recorded: false };
+  }
+  if (!isPlainObject(value.candidate)) fail('missing_key', `${pathLabel}.candidate`);
+  if (!isPlainObject(value.published_3_4_2)) fail('missing_key', `${pathLabel}.published_3_4_2`);
+  if (!isPlainObject(value.host)) fail('missing_key', `${pathLabel}.host`);
+  if (!isPlainObject(value.astra)) fail('missing_key', `${pathLabel}.astra`);
+  if (!isPlainObject(value.approaches)) fail('missing_key', `${pathLabel}.approaches`);
+  const hostModel = value.host.host_model;
+  if (typeof hostModel !== 'string' || hostModel.length === 0) {
+    fail('missing_key', `${pathLabel}.host.host_model`);
+  }
+  if (hostModel === PLACEHOLDER_HOST_MODEL) {
+    fail('identity_mismatch', 'codex-default placeholders are not comparable truth.');
+  }
+  if (hostModel !== ASTRA_MODEL) {
+    fail('identity_mismatch', `Recorded host_model must be the Astra host ${ASTRA_MODEL}.`);
+  }
+  if (!isPlainObject(value.host.host_settings)) fail('missing_key', `${pathLabel}.host.host_settings`);
+  const astra = parseProviderModel(value.astra, `${pathLabel}.astra`, ASTRA_PROVIDER);
+  if (astra.model !== ASTRA_MODEL || astra.model !== hostModel) {
+    fail('identity_mismatch', `Astra model must be ${ASTRA_MODEL} and match host.host_model.`);
+  }
+  const candidateSha = ownSha(value.candidate.sha, `${pathLabel}.candidate.sha`);
+  if (!Object.hasOwn(value.candidate, 'tree') || value.candidate.tree == null) {
+    fail('missing_key', `${pathLabel}.candidate.tree`);
+  }
+  const candidateTree = ownSha(value.candidate.tree, `${pathLabel}.candidate.tree`);
+  const publishedSha = ownSha(value.published_3_4_2.sha, `${pathLabel}.published_3_4_2.sha`);
+  if (publishedSha !== PUBLISHED_342_SHA) {
+    fail('identity_mismatch', 'published_3_4_2.sha must be the frozen 3.4.2 baseline.');
+  }
+  if (candidateSha === publishedSha) {
+    fail('identity_mismatch', 'Candidate SHA cannot equal published SHA.');
+  }
+  const providerConfiguration = parseCaseRoutes(
+    value.provider_configuration,
+    `${pathLabel}.provider_configuration`,
+  );
+  const approaches = {};
+  for (const arm of QUALIFICATION_ARMS) {
+    const row = value.approaches[arm];
+    if (!isPlainObject(row)) fail('missing_key', `${pathLabel}.approaches.${arm}`);
+    if (row.external_jobs !== (arm !== 'native-codex')) {
+      fail('identity_mismatch', `${arm} external_jobs must be ${arm !== 'native-codex'}.`);
+    }
+    if (row.host_model != null && row.host_model !== hostModel) {
+      fail('identity_mismatch', `${arm} planned host_model conflicts with host.host_model.`);
+    }
+    if (row.host_settings != null && settingsDigest(row.host_settings) !== settingsDigest(value.host.host_settings)) {
+      fail('identity_mismatch', `${arm} planned host_settings conflict with host.host_settings.`);
+    }
+    if (arm === 'native-codex') {
+      approaches[arm] = {
+        external_jobs: false,
+        coengineer_source: { kind: 'native', value: 'native-codex' },
+      };
+    } else {
+      const sourceValue = arm === 'published-3.4.2' ? publishedSha : candidateSha;
+      const recorded = row.coengineer_source;
+      if (recorded != null) {
+        if (!isPlainObject(recorded) || recorded.kind !== 'git_commit' || recorded.value !== sourceValue) {
+          fail('identity_mismatch', `${arm} coengineer_source conflicts with bound SHA.`);
+        }
+      }
+      approaches[arm] = {
+        external_jobs: true,
+        coengineer_source: { kind: 'git_commit', value: sourceValue },
+      };
+    }
+  }
+  if (Object.keys(value.approaches).sort().join(',') !== [...QUALIFICATION_ARMS].slice().sort().join(',')) {
+    fail('identity_mismatch', 'Execution manifest must record exactly the four required approaches.');
+  }
+  return {
+    status: 'recorded',
+    recorded: true,
+    candidate_sha: candidateSha,
+    candidate_tree: candidateTree,
+    published_sha: publishedSha,
+    host_model: hostModel,
+    host_settings: value.host.host_settings,
+    astra,
+    provider_configuration: providerConfiguration,
+    approaches,
+    input_digests: parseBoundDigests(value.input_digests, `${pathLabel}.input_digests`),
+    check_digests: parseBoundDigests(value.check_digests, `${pathLabel}.check_digests`),
+  };
+}
+
+function emptyAstraMetric(astra = null) {
+  return {
+    value: null,
+    source: 'unknown',
+    trust: 'unknown',
+    reported_sum: null,
+    reported_count: 0,
+    unknown_count: 0,
+    unit: 'tokens',
+    model: astra?.model ?? null,
+    provider: astra?.provider ?? null,
+    includes_helpers: false,
+    coverage_complete: false,
+    reason: 'missing_usage_report',
+  };
+}
+
+function parseHostUsageModelRow(row, pathLabel) {
+  if (!isPlainObject(row)) fail('invalid_type', pathLabel);
+  const model = row.model;
+  if (typeof model !== 'string' || model.length === 0) {
+    fail('invalid_format', `${pathLabel}.model`);
+  }
+  const parsed = { model };
+  for (const key of HOST_MODEL_COUNTERS) {
+    parsed[key] = parseOptionalCounter(row[key], `${pathLabel}.${key}`);
+  }
+  return parsed;
+}
+
+function parseHostUsageAttemptRow(entry, pathLabel) {
+  if (!isPlainObject(entry)) fail('invalid_type', pathLabel);
+  const attemptId = entry.attempt_id;
+  if (typeof attemptId !== 'string' || !QUAL_TRIAL_ID.test(attemptId)) {
+    fail('invalid_format', `${pathLabel}.attempt_id`);
+  }
+  const byModelInput = Array.isArray(entry.by_model) ? entry.by_model : [];
+  const parsed = {
+    attempt_id: attemptId,
+    session_id: typeof entry.session_id === 'string' ? entry.session_id : null,
+    compaction_events: parseOptionalCounter(entry.compaction_events, `${pathLabel}.compaction_events`),
+    by_model: byModelInput.map((row, rowIndex) => (
+      parseHostUsageModelRow(row, `${pathLabel}.by_model[${rowIndex}]`)
+    )),
+  };
+  for (const key of HOST_USAGE_COUNTERS) {
+    parsed[key] = parseOptionalCounter(entry[key], `${pathLabel}.${key}`);
+  }
+  return parsed;
+}
+
+function reconcileHostUsageAttempt(row, trialAttempt) {
+  const reasons = [];
+  const seenModels = new Set();
+  for (const entry of row.by_model) {
+    if (seenModels.has(entry.model)) {
+      reasons.push(`duplicate_model:${row.attempt_id}:${entry.model}`);
+    }
+    seenModels.add(entry.model);
+  }
+  const uniqueModels = seenModels.size === row.by_model.length;
+  if (uniqueModels) {
+    for (const key of HOST_USAGE_COUNTERS) {
+      if (row[key] == null) continue;
+      const summed = sumModelCounter(row.by_model, key);
+      if (row[key] !== summed) reasons.push(`by_model_sum:${row.attempt_id}:${key}`);
+    }
+  }
+  if (trialAttempt != null) {
+    if (row.input_tokens !== trialAttempt.usage.native_input_tokens.value) {
+      reasons.push(`native_usage:${row.attempt_id}:native_input_tokens`);
+    }
+    if (row.output_tokens !== trialAttempt.usage.native_output_tokens.value) {
+      reasons.push(`native_usage:${row.attempt_id}:native_output_tokens`);
+    }
+  }
+  return reasons;
+}
+
+function reconcileHostUsageReport(report, claimedTrialDigest, computedTrialDigest) {
+  const reasons = [];
+  if (claimedTrialDigest == null || claimedTrialDigest !== computedTrialDigest) {
+    reasons.push('trial_digest');
+  }
+  const trialAttempts = new Map(report.trial.attempts.map((attempt) => [attempt.attempt_id, attempt]));
+  const seenAttemptIds = new Set();
+  const totals = report.breakdown.totals;
+  const summedTotals = Object.fromEntries(HOST_USAGE_COUNTERS.map((key) => [key, 0]));
+  let compactionSum = 0;
+  let totalsMeasurable = true;
+  for (const row of report.breakdown.attempts) {
+    if (seenAttemptIds.has(row.attempt_id)) reasons.push(`duplicate_attempt_id:${row.attempt_id}`);
+    seenAttemptIds.add(row.attempt_id);
+    const trialAttempt = trialAttempts.get(row.attempt_id);
+    if (trialAttempt == null) reasons.push(`extra_attempt:${row.attempt_id}`);
+    reasons.push(...reconcileHostUsageAttempt(row, trialAttempt));
+    for (const key of HOST_USAGE_COUNTERS) {
+      if (row[key] == null || summedTotals[key] == null) {
+        summedTotals[key] = null;
+        totalsMeasurable = false;
+      } else {
+        summedTotals[key] += row[key];
+      }
+    }
+    if (row.compaction_events == null) compactionSum = null;
+    else if (compactionSum != null) compactionSum += row.compaction_events;
+  }
+  for (const attempt of report.trial.attempts) {
+    if (!seenAttemptIds.has(attempt.attempt_id)) reasons.push(`missing_attempt:${attempt.attempt_id}`);
+  }
+  const totalsPresent = HOST_USAGE_COUNTERS.some((key) => totals[key] != null)
+    || totals.compaction_events != null;
+  if (totalsPresent && totalsMeasurable) {
+    for (const key of HOST_USAGE_COUNTERS) {
+      if (totals[key] !== summedTotals[key]) reasons.push(`totals:${key}`);
+    }
+    if (totals.compaction_events != null && totals.compaction_events !== compactionSum) {
+      reasons.push('totals:compaction_events');
+    }
+  }
+  return [...new Set(reasons)];
+}
+
+export function parseHostUsageReport(value, pathLabel = 'usage_report') {
+  if (!isPlainObject(value)) fail('invalid_type', `${pathLabel} must be a JSON object.`);
+  if (value.schema !== HOST_USAGE_REPORT_SCHEMA_ID) fail('invalid_format', `${pathLabel}.schema`);
+  const status = value.status;
+  if (status !== 'complete' && status !== 'inconclusive') {
+    fail('invalid_format', `${pathLabel}.status`);
+  }
+  const computedTrialDigest = isPlainObject(value.trial) ? hostUsageTrialDigest(value.trial) : null;
+  const trial = parseQualificationTrial(value.trial, `${pathLabel}.trial`);
+  const breakdown = value.breakdown;
+  if (!isPlainObject(breakdown) || !Array.isArray(breakdown.attempts)) {
+    fail('invalid_format', `${pathLabel}.breakdown.attempts`);
+  }
+  const attempts = breakdown.attempts.map((entry, index) => (
+    parseHostUsageAttemptRow(entry, `${pathLabel}.breakdown.attempts[${index}]`)
+  ));
+  const evidence = isPlainObject(value.evidence) ? value.evidence : {};
+  const digests = isPlainObject(evidence.digests) ? evidence.digests : {};
+  const claimedTrialDigest = typeof digests.trial === 'string' && SHA256.test(digests.trial)
+    ? digests.trial
+    : null;
+  const incompletePrimary = evidence.incomplete_primary_evidence === true || status !== 'complete';
+  const parsed = {
+    schema: HOST_USAGE_REPORT_SCHEMA_ID,
+    status,
+    trial,
+    breakdown: {
+      attempts,
+      totals: isPlainObject(breakdown.totals) ? breakdown.totals : {},
+      accounting: isPlainObject(breakdown.accounting) ? breakdown.accounting : {},
+    },
+    evidence: {
+      digests: {
+        manifest: typeof digests.manifest === 'string' ? digests.manifest : null,
+        sessions: isPlainObject(digests.sessions) ? digests.sessions : {},
+        links: Array.isArray(digests.links) ? digests.links : [],
+        trial: claimedTrialDigest,
+      },
+      notes: Array.isArray(evidence.notes) ? evidence.notes : [],
+      incomplete_primary_evidence: incompletePrimary,
+      trial_digest_verified: claimedTrialDigest != null && claimedTrialDigest === computedTrialDigest,
+    },
+    measured_numbers_retained: true,
+    bound_mismatch: null,
+  };
+  parsed.integrity = {
+    reasons: reconcileHostUsageReport(parsed, claimedTrialDigest, computedTrialDigest),
+  };
+  parsed.integrity.ok = parsed.integrity.reasons.length === 0;
+  return parsed;
+}
+
+function reportMatchesTrial(report, trial) {
+  if (canonicalJsonStringify(report.trial) !== canonicalJsonStringify(trial)) {
+    return 'canonical_trial';
+  }
+  return null;
+}
+
+function astraOutputFromReport(report, astra, trial) {
+  const empty = {
+    value: null,
+    includesHelpers: false,
+    observed: false,
+    coverageComplete: false,
+    untrusted: true,
+  };
+  if (astra == null || typeof astra.model !== 'string') return empty;
+  if (report.bound_mismatch) return empty;
+  const duplicateAttempts = report.integrity.reasons.some((reason) => reason.startsWith('duplicate_attempt_id:'));
+  const duplicateModels = report.integrity.reasons.some((reason) => reason.startsWith('duplicate_model:'));
+  if (duplicateAttempts || duplicateModels) return empty;
+
+  const byAttemptId = new Map();
+  for (const row of report.breakdown.attempts) {
+    if (byAttemptId.has(row.attempt_id)) return empty;
+    byAttemptId.set(row.attempt_id, row);
+  }
+
+  let sum = 0;
+  let observed = false;
+  let includesHelpers = false;
+  let coverageComplete = report.integrity.ok && report.status === 'complete'
+    && report.evidence.incomplete_primary_evidence !== true;
+  let untrusted = false;
+
+  for (const attempt of trial.attempts) {
+    const row = byAttemptId.get(attempt.attempt_id);
+    if (row == null) {
+      coverageComplete = false;
+      continue;
+    }
+    const rowReasons = report.integrity.reasons.filter((reason) => reason.includes(`:${attempt.attempt_id}:`)
+      || reason === `extra_attempt:${attempt.attempt_id}`
+      || reason === `duplicate_attempt_id:${attempt.attempt_id}`
+      || reason === `missing_attempt:${attempt.attempt_id}`);
+    const rowUntrusted = rowReasons.some((reason) => (
+      reason.startsWith('by_model_sum:')
+      || reason.startsWith('native_usage:')
+      || reason.startsWith('duplicate_model:')
+      || reason.startsWith('duplicate_attempt_id:')
+    ));
+    if (rowUntrusted) {
+      untrusted = true;
+      coverageComplete = false;
+      continue;
+    }
+    const matching = row.by_model.filter((entry) => entry.model === astra.model);
+    if (matching.length === 0) continue;
+    let attemptSum = 0;
+    let missing = false;
+    for (const entry of matching) {
+      if (entry.output_tokens == null) {
+        missing = true;
+        break;
+      }
+      attemptSum += entry.output_tokens;
+    }
+    if (missing) {
+      coverageComplete = false;
+      continue;
+    }
+    sum += attemptSum;
+    observed = true;
+    if (attempt.kind === 'native_helper') includesHelpers = true;
+  }
+  for (const attemptId of byAttemptId.keys()) {
+    if (!trial.attempts.some((attempt) => attempt.attempt_id === attemptId)) {
+      coverageComplete = false;
+      untrusted = true;
+    }
+  }
+  if (untrusted && !observed) {
+    return { value: null, includesHelpers, observed: false, coverageComplete: false, untrusted: true };
+  }
+  return {
+    value: observed ? sum : null,
+    includesHelpers,
+    observed,
+    coverageComplete: coverageComplete && !untrusted && observed,
+    untrusted,
+  };
+}
+
+function accountAstraOwnNativeOutput(trials, astra, reportsByTrialId) {
+  const result = emptyAstraMetric(astra);
+  if (astra == null || trials.length === 0) return result;
+  let sum = 0;
+  let known = 0;
+  let unknown = 0;
+  let includesHelpers = false;
+  let coverageComplete = true;
+  for (const trial of trials) {
+    const report = reportsByTrialId.get(trial.trial_id);
+    if (report == null) {
+      unknown += 1;
+      coverageComplete = false;
+      continue;
+    }
+    if (report.status !== 'complete'
+      || report.evidence.incomplete_primary_evidence === true
+      || report.integrity.ok !== true
+      || report.bound_mismatch) {
+      coverageComplete = false;
+    }
+    const observed = astraOutputFromReport(report, astra, trial);
+    if (observed.untrusted && !observed.observed) {
+      unknown += 1;
+      coverageComplete = false;
+      continue;
+    }
+    if (!observed.coverageComplete) coverageComplete = false;
+    if (!observed.observed || observed.value == null) {
+      unknown += 1;
+      continue;
+    }
+    sum += observed.value;
+    known += 1;
+    if (observed.includesHelpers) includesHelpers = true;
+  }
+  result.reported_sum = known > 0 ? sum : null;
+  result.reported_count = known;
+  result.unknown_count = unknown;
+  result.includes_helpers = includesHelpers;
+  result.coverage_complete = coverageComplete && unknown === 0 && known === trials.length;
+  if (known > 0) {
+    result.value = sum;
+    result.source = 'host_measured';
+    result.trust = result.coverage_complete ? 'host_authoritative' : 'unknown';
+  }
+  if (!coverageComplete || unknown > 0 || !result.coverage_complete) {
+    result.reason = 'incomplete_primary_coverage';
+  } else {
+    result.reason = 'observed_native_model';
+  }
+  return result;
+}
+
+export function accountArm(trials, astra = null, reportsByTrialId = new Map()) {
+  const aggregated = aggregateTrials(trials);
+  let missingPrimary = 0;
+  for (const trial of trials) {
+    if (trial.accepted !== true && trial.accepted !== false) missingPrimary += 1;
+  }
+  return {
+    ...aggregated,
+    missing_primary_count: missingPrimary,
+    astra_own_native_output: accountAstraOwnNativeOutput(trials, astra, reportsByTrialId),
+  };
+}
+
+function median(values) {
+  if (values.length === 0 || values.some((value) => value == null || Number.isNaN(value))) return null;
+  const sorted = [...values].sort((left, right) => left - right);
+  const mid = Math.floor(sorted.length / 2);
+  if (sorted.length % 2 === 1) return sorted[mid];
+  return (sorted[mid - 1] + sorted[mid]) / 2;
+}
+
+function ratio(numerator, denominator) {
+  if (numerator == null || denominator == null || denominator === 0) return null;
+  return numerator / denominator;
+}
+
+function comparableMismatch(trial, caseRecord, manifest, arm) {
+  if (trial.case_id !== caseRecord.id) return 'case_mismatch';
+  if (trial.input_digest !== caseRecord.input_digest) return 'input_digest_mismatch';
+  if (caseRecord.base_sha != null && trial.base_sha !== caseRecord.base_sha) return 'base_sha_mismatch';
+  if (trial.host_model !== manifest.host_model) return 'host_model_mismatch';
+  if (settingsDigest(trial.host_settings) !== settingsDigest(manifest.host_settings)) {
+    return 'host_settings_mismatch';
+  }
+  if (trial.host_model === PLACEHOLDER_HOST_MODEL) return 'placeholder_host_model';
+  const expectedSource = manifest.approaches[arm].coengineer_source;
+  if (trial.coengineer_source.kind !== expectedSource.kind || trial.coengineer_source.value !== expectedSource.value) {
+    return 'source_mismatch';
+  }
+  if (COENGINEER_ARMS.includes(arm)) {
+    const expectedRoute = manifest.provider_configuration[caseRecord.id];
+    if (expectedRoute == null) return 'provider_configuration_mismatch';
+    if (settingsDigest(trial.provider_configuration) !== settingsDigest(expectedRoute)) {
+      return 'provider_configuration_mismatch';
+    }
+  }
+  return null;
+}
+
+function indexUsageReports(usageReports, parsedTrials, mark) {
+  const reportsByTrialId = new Map();
+  if (usageReports == null) return reportsByTrialId;
+  if (!Array.isArray(usageReports)) fail('invalid_type', 'usage_reports must be an array.');
+  const trialById = new Map(parsedTrials.map((trial) => [trial.trial_id, trial]));
+  for (let index = 0; index < usageReports.length; index += 1) {
+    const report = parseHostUsageReport(usageReports[index], `usage_reports[${index}]`);
+    if (reportsByTrialId.has(report.trial.trial_id)) {
+      fail('duplicate_id', `duplicate usage report for ${report.trial.trial_id}`);
+    }
+    const trial = trialById.get(report.trial.trial_id);
+    if (trial == null) {
+      mark('inconclusive', `usage_report_unknown_trial:${report.trial.trial_id}`);
+      reportsByTrialId.set(report.trial.trial_id, report);
+      continue;
+    }
+    const mismatch = reportMatchesTrial(report, trial);
+    report.bound_mismatch = mismatch;
+    if (mismatch) {
+      mark('inconclusive', `usage_report_mismatch:${report.trial.trial_id}:${mismatch}`);
+    }
+    if (report.integrity.ok !== true) {
+      mark(
+        'inconclusive',
+        `usage_report_inconsistent:${report.trial.trial_id}:${report.integrity.reasons[0]}`,
+      );
+    }
+    reportsByTrialId.set(report.trial.trial_id, report);
+  }
+  return reportsByTrialId;
+}
+
+export function evaluateQualificationCohort({
+  protocol,
+  cases,
+  trials,
+  executionManifest,
+  usageReports = null,
+}) {
+  const parsedProtocol = protocol ?? protocolRecord();
+  if (!Array.isArray(parsedProtocol.approaches)
+    || parsedProtocol.approaches.join(',') !== QUALIFICATION_ARMS.join(',')) {
+    fail('identity_mismatch', 'Qualification protocol must require all four approaches.');
+  }
+  if (parsedProtocol.arms?.optional?.length) {
+    fail('identity_mismatch', 'Qualification protocol must not inherit OPTIONAL_ARMS.');
+  }
+  const manifest = parseExecutionManifest(executionManifest);
+  const schedule = generateSchedule();
+  if (schedule.trial_count !== 24 || new Set(schedule.canonical.map((row) => row.trial_id)).size !== 24) {
+    fail('identity_mismatch', 'Planned identities must be exactly 24 unique trial ids.');
+  }
+  const parsedCases = cases.map((entry) => parseQualificationCase(entry));
+  const reasons = [];
+  let decision = 'pass';
+  function mark(status, reason) {
+    reasons.push(reason);
+    if (status === 'inconclusive') {
+      if (decision !== 'inconclusive') decision = 'inconclusive';
+    } else if (status === 'fail' && decision === 'pass') {
+      decision = 'fail';
+    }
+  }
+
+  if (!manifest.recorded) {
+    mark('inconclusive', 'execution_manifest_unrecorded');
+    return {
+      schema: 'codex-co-engineer.qualification-cohort.v1',
+      decision: 'inconclusive',
+      reasons,
+      planned_identities: 24,
+      compared_identities: 0,
+    };
+  }
+  for (const caseRecord of parsedCases) {
+    const expectedInput = manifest.input_digests[caseRecord.id];
+    const expectedCheck = manifest.check_digests[caseRecord.id];
+    if (expectedInput !== caseRecord.input_digest) mark('inconclusive', `input_digest_mismatch:${caseRecord.id}`);
+    if (expectedCheck !== caseRecord.check_digest) mark('inconclusive', `check_digest_mismatch:${caseRecord.id}`);
+  }
+
+  const parsedTrials = trials.map((entry, index) => parseQualificationTrial(entry, `trials[${index}]`));
+  const byId = new Map(parsedTrials.map((trial) => [trial.trial_id, trial]));
+  if (byId.size !== parsedTrials.length) fail('duplicate_id', 'duplicate trial_id');
+  const reportsByTrialId = indexUsageReports(usageReports, parsedTrials, mark);
+
+  const matchedByKey = new Map();
+  const taskRows = [];
+  let comparedIdentities = 0;
+  let omitted = 0;
+  let mismatched = 0;
+  let missingEvidence = 0;
+
+  for (const caseRecord of parsedCases) {
+    const arms = {};
+    for (const arm of QUALIFICATION_ARMS) {
+      const planned = schedule.canonical.filter((row) => row.case_id === caseRecord.id && row.arm === arm);
+      const matched = [];
+      const unmatched = [];
+      for (const plan of planned) {
+        const trial = byId.get(plan.trial_id);
+        if (trial == null) {
+          omitted += 1;
+          unmatched.push({ trial_id: plan.trial_id, reason: 'omitted_arm_or_trial' });
+          mark('inconclusive', `omitted:${plan.trial_id}`);
+          continue;
+        }
+        const mismatch = comparableMismatch(trial, caseRecord, manifest, arm);
+        if (mismatch) {
+          mismatched += 1;
+          unmatched.push({ trial_id: plan.trial_id, reason: mismatch });
+          mark('inconclusive', `mismatch:${plan.trial_id}:${mismatch}`);
+          continue;
+        }
+        if (trial.accepted !== true && trial.accepted !== false) {
+          missingEvidence += 1;
+          mark('inconclusive', `missing_acceptance:${plan.trial_id}`);
+        }
+        if (trial.wall_elapsed_ms?.value == null) {
+          missingEvidence += 1;
+          mark('inconclusive', `missing_primary:${plan.trial_id}`);
+        }
+        const trialCorrections = trial.attempts.filter((attempt) => attempt.kind === 'correction').length;
+        if (trialCorrections > MAX_CORRECTIONS) {
+          mark('fail', `too_many_corrections:${plan.trial_id}`);
+        }
+        if (trial.wall_elapsed_ms?.value != null && trial.wall_elapsed_ms.value > TRIAL_DEADLINE_MS) {
+          mark('fail', `deadline_exceeded:${plan.trial_id}`);
+        }
+        const report = reportsByTrialId.get(plan.trial_id);
+        if (report == null) {
+          missingEvidence += 1;
+          mark('inconclusive', `missing_usage_report:${plan.trial_id}`);
+        } else if (report.status !== 'complete' || report.evidence.incomplete_primary_evidence === true) {
+          missingEvidence += 1;
+          mark('inconclusive', `usage_report_inconclusive:${plan.trial_id}`);
+        }
+        matched.push(trial);
+        matchedByKey.set(`${plan.case_id}:${plan.arm}:${plan.rep}`, trial);
+        comparedIdentities += 1;
+      }
+      arms[arm] = {
+        arm,
+        status: matched.length === planned.length && unmatched.length === 0 ? 'compared' : (planned.length === unmatched.length && matched.length === 0 ? 'omitted' : 'partial'),
+        unmatched,
+        ...accountArm(matched, manifest.astra, reportsByTrialId),
+      };
+    }
+    taskRows.push({
+      case_id: caseRecord.id,
+      input_digest: caseRecord.input_digest,
+      base_sha: caseRecord.base_sha,
+      arms,
+    });
+  }
+
+  const candidateAccepted = taskRows.reduce((sum, row) => sum + row.arms['candidate-3.4.3'].accepted_count, 0);
+  const candidateKnown = taskRows.reduce((sum, row) => sum + row.arms['candidate-3.4.3'].accepted_known_count, 0);
+  const candidateTrials = taskRows.reduce((sum, row) => sum + row.arms['candidate-3.4.3'].trial_count, 0);
+
+  const taskNativeRatios = [];
+  const taskPublishedRatios = [];
+  const taskOverheadRatios = [];
+  const trialTurnaroundRatios = [];
+  let pooledCandidateNumerator = 0;
+  let pooledCandidateAccepted = 0;
+  let pooledNativeNumerator = 0;
+  let pooledNativeAccepted = 0;
+
+  for (const row of taskRows) {
+    const candidate = row.arms['candidate-3.4.3'].usage_per_accepted_result.native_output_tokens;
+    const native = row.arms['native-codex'].usage_per_accepted_result.native_output_tokens;
+    const published = row.arms['published-3.4.2'].usage_per_accepted_result.native_output_tokens;
+    const direct = row.arms['direct-delegation'].usage_per_accepted_result.native_output_tokens;
+    taskNativeRatios.push(ratio(candidate.value, native.value));
+    taskPublishedRatios.push(ratio(candidate.value, published.value));
+    taskOverheadRatios.push(ratio(candidate.value, direct.value));
+    if (candidate.numerator != null && native.numerator != null) {
+      pooledCandidateNumerator += candidate.numerator;
+      pooledCandidateAccepted += candidate.known_accepted_count;
+      pooledNativeNumerator += native.numerator;
+      pooledNativeAccepted += native.known_accepted_count;
+    }
+    for (let rep = 1; rep <= REPETITIONS; rep += 1) {
+      const candidateTrial = matchedByKey.get(`${row.case_id}:candidate-3.4.3:${rep}`);
+      const nativeTrial = matchedByKey.get(`${row.case_id}:native-codex:${rep}`);
+      const candidateWall = candidateTrial?.wall_elapsed_ms?.value ?? null;
+      const nativeWall = nativeTrial?.wall_elapsed_ms?.value ?? null;
+      trialTurnaroundRatios.push(ratio(candidateWall, nativeWall));
+    }
+  }
+
+  const taskMedianVsNative = median(taskNativeRatios);
+  const taskMedianVsPublished = median(taskPublishedRatios);
+  const pooledVsNative = ratio(
+    pooledCandidateAccepted === 0 ? null : pooledCandidateNumerator / pooledCandidateAccepted,
+    pooledNativeAccepted === 0 ? null : pooledNativeNumerator / pooledNativeAccepted,
+  );
+  const medianTurnaround = median(trialTurnaroundRatios);
+  const nativeOverhead = median(taskOverheadRatios);
+
+  let astraCandidate = 0;
+  let astraPublished = 0;
+  let astraMeasured = false;
+  let astraCoverageComplete = true;
+  for (const row of taskRows) {
+    const cand = row.arms['candidate-3.4.3'].astra_own_native_output;
+    const pub = row.arms['published-3.4.2'].astra_own_native_output;
+    if (cand.coverage_complete !== true || pub.coverage_complete !== true) astraCoverageComplete = false;
+    if (cand.value != null) {
+      astraCandidate += cand.value;
+      astraMeasured = true;
+    }
+    if (pub.value != null) {
+      astraPublished += pub.value;
+      astraMeasured = true;
+    }
+    if (cand.value == null || pub.value == null) astraCoverageComplete = false;
+  }
+
+  for (const arm of QUALIFICATION_ARMS) {
+    const count = taskRows.reduce((sum, row) => sum + row.arms[arm].trial_count, 0);
+    if (count !== 6) mark('inconclusive', `arm_count_not_6:${arm}`);
+  }
+  if (candidateTrials !== 6 || candidateKnown !== 6) {
+    mark('inconclusive', 'candidate_acceptance_coverage_incomplete');
+  } else if (candidateAccepted !== 6) {
+    mark('fail', 'candidate_not_6_of_6_accepted');
+  }
+  if (taskMedianVsNative == null) mark('inconclusive', 'task_median_vs_native_unknown');
+  else if (taskMedianVsNative > 0.5) mark('fail', 'task_median_vs_native_exceeds_0.5');
+  if (taskMedianVsPublished == null) mark('inconclusive', 'task_median_vs_published_unknown');
+  else if (taskMedianVsPublished > 0.75) mark('fail', 'task_median_vs_published_exceeds_0.75');
+  if (!astraCoverageComplete) mark('inconclusive', 'astra_own_output_unknown');
+  else if (!(astraCandidate < astraPublished)) mark('fail', 'astra_own_output_did_not_decrease');
+  if (medianTurnaround == null) mark('inconclusive', 'median_turnaround_unknown');
+  else if (medianTurnaround > 2) mark('fail', 'median_turnaround_exceeds_2x_native');
+  if (nativeOverhead == null) mark('inconclusive', 'native_overhead_unknown');
+  else if (nativeOverhead > 1.25) mark('fail', 'native_overhead_exceeds_1.25x_direct');
+
+  const uniqueUnknown = parsedTrials.filter((trial) => !schedule.canonical.some((row) => row.trial_id === trial.trial_id));
+  if (uniqueUnknown.length > 0) mark('inconclusive', 'unknown_trial_identity');
+
+  return {
+    schema: 'codex-co-engineer.qualification-cohort.v1',
+    version: 1,
+    decision,
+    reasons,
+    planned_identities: 24,
+    compared_identities: comparedIdentities,
+    omitted,
+    mismatched,
+    missing_evidence: missingEvidence,
+    candidate_accepted: `${candidateAccepted}/${candidateTrials}`,
+    thresholds: freezeThresholds(),
+    metrics: {
+      task_median_native_output_per_accepted_vs_native: taskMedianVsNative,
+      task_median_native_output_per_accepted_vs_published: taskMedianVsPublished,
+      pooled_native_output_per_accepted_vs_native: pooledVsNative,
+      astra_own_native_output: {
+        candidate: astraMeasured ? astraCandidate : null,
+        published: astraMeasured ? astraPublished : null,
+        decreased: astraCoverageComplete ? astraCandidate < astraPublished : null,
+        coverage_complete: astraCoverageComplete,
+      },
+      median_turnaround_vs_native: medianTurnaround,
+      median_turnaround_reduction: TURNAROUND_REDUCTION,
+      native_overhead_vs_direct: nativeOverhead,
+      native_overhead_reduction: OVERHEAD_REDUCTION,
+      astra_own_output_reduction: ASTRA_REDUCTION,
+    },
+    cases: taskRows,
+  };
+}
+
+export async function validateQualification() {
+  if ([...PUBLIC_MCP_TOOLS].join(',') !== FIVE_TOOLS.join(',')) {
+    fail('identity_mismatch', 'Public catalog must remain the five tools.');
+  }
+  const existing = await loadCases(EXISTING_CASES_ROOT);
+  if (existing.length !== 4) {
+    fail('identity_mismatch', 'Existing four comparator fixtures must remain unchanged.');
+  }
+  const packed = await loadQualificationCases();
+  const protocol = JSON.parse(await readFile(PROTOCOL_PATH, 'utf8'));
+  if (protocol.schema !== QUALIFICATION_PROTOCOL_SCHEMA_ID) fail('invalid_format', 'protocol.schema');
+  if (protocol.status !== 'unrun') fail('identity_mismatch', 'Protocol must stay labeled unrun until trials execute.');
+  if (Object.hasOwn(protocol, 'candidate_sha')) {
+    fail('stale_identity', 'Tracked protocol must not bind a future candidate SHA.');
+  }
+  if (protocol.arms.required.join(',') !== QUALIFICATION_ARMS.join(',') || protocol.arms.optional.length !== 0) {
+    fail('identity_mismatch', 'All four approaches are required; OPTIONAL_ARMS must not be inherited.');
+  }
+  const manifest = JSON.parse(await readFile(MANIFEST_PATH, 'utf8'));
+  const expected = generateSchedule();
+  if (JSON.stringify(manifest.schedule) !== JSON.stringify(expected.ordered)) {
+    fail('identity_mismatch', 'Operator schedule does not match seed 43 ordering.');
+  }
+  if (Object.hasOwn(manifest, 'candidate_sha')) {
+    fail('stale_identity', 'Operator manifest must not bind a future candidate SHA.');
+  }
+  const precollection = JSON.parse(await readFile(PRECOLLECTION_PATH, 'utf8'));
+  parseExecutionManifest(precollection);
+  if (precollection.status !== 'unrecorded') {
+    fail('identity_mismatch', 'Tracked precollection manifest must remain unrecorded.');
+  }
+  return {
+    valid: true,
+    case_count: packed.raw.length,
+    ids: packed.raw.map((entry) => entry.id),
+    input_digests: Object.fromEntries(packed.raw.map((entry) => [entry.id, entry.input_digest])),
+    check_digests: Object.fromEntries(packed.raw.map((entry) => [entry.id, entry.check_digest])),
+    base_shas: Object.fromEntries(packed.raw.map((entry) => [entry.id, entry.base_sha])),
+    source_shas: Object.fromEntries(packed.raw.map((entry) => [entry.id, entry.source_sha])),
+    status: 'unrun',
+    live_jobs: 'not_implemented',
+    planned_identities: 24,
+  };
+}
+
+function printUsage() {
+  return `Usage:
+  node scripts/prepare-coengineer-qualification.mjs --validate
+  node scripts/prepare-coengineer-qualification.mjs --pack
+  node scripts/prepare-coengineer-qualification.mjs --schedule
+  node scripts/prepare-coengineer-qualification.mjs --materialize-case FILE --destination DIR
+  node scripts/prepare-coengineer-qualification.mjs --extract-source --case ID --destination DIR
+  node scripts/prepare-coengineer-qualification.mjs --check-known-bad [--case ID]
+  node scripts/prepare-coengineer-qualification.mjs --evaluate-cohort --trials FILE --execution-manifest FILE
+
+Non-provider helper. Live provider jobs are not implemented. Paid repeated
+trials require --live --paid-budget and are still not executed. Destination
+directories must be empty. Host Astra settings are recorded in an external
+execution manifest before collection. Never invent backend IDs.
+`;
+}
+
+function parseArgv(argv) {
+  const flags = Object.create(null);
+  for (let index = 0; index < argv.length; index += 1) {
+    const arg = argv[index];
+    if (!arg.startsWith('--')) fail('unknown_flag', `Unexpected argument ${arg}.`);
+    if (BOOLEAN_FLAGS.includes(arg)) {
+      flags[arg] = true;
+      continue;
+    }
+    if (!VALUE_FLAGS.includes(arg)) fail('unknown_flag', `Unknown flag ${arg}.`);
+    const value = argv[index + 1];
+    if (value == null || value.startsWith('--')) fail('missing_flag', `${arg} requires a value.`);
+    flags[arg] = value;
+    index += 1;
+  }
+  return flags;
+}
+
+export async function main(argv, io = { stdout: process.stdout, stderr: process.stderr }) {
+  if (argv.length === 0 || argv.includes('--help')) {
+    io.stdout.write(printUsage());
+    return 0;
+  }
+  let flags;
+  try {
+    flags = parseArgv(argv);
+  } catch (error) {
+    io.stderr.write(`${error instanceof Error ? error.message : String(error)}\n`);
+    io.stderr.write(printUsage());
+    return 2;
+  }
+  if (flags['--live']) {
+    io.stderr.write('Live provider jobs are not implemented. Supply sanitized trial records.\n');
+    if (flags['--paid-budget'] == null) {
+      io.stderr.write(`Paid repeated trials are opt-in, capped at $${PAID_CEILING_USD}, and require --paid-budget.\n`);
+    } else {
+      io.stderr.write(`Paid ceiling is $${PAID_CEILING_USD}. This helper still does not run jobs.\n`);
+    }
+    return 2;
+  }
+  if (flags['--pack']) {
+    const packed = await writePackedCases();
+    await writeProtocolAndManifest();
+    io.stdout.write(`${JSON.stringify({
+      packed: packed.map((entry) => ({
+        id: entry.id,
+        input_digest: entry.input_digest,
+        base_sha: entry.base_sha,
+        source_sha: entry.source_sha,
+      })),
+      status: 'unrun',
+    }, null, 2)}\n`);
+    return 0;
+  }
+  if (flags['--schedule']) {
+    io.stdout.write(`${JSON.stringify(operatorManifest(), null, 2)}\n`);
+    return 0;
+  }
+  if (flags['--materialize-case'] != null) {
+    if (flags['--destination'] == null) {
+      io.stderr.write('Missing --destination DIR.\n');
+      return 2;
+    }
+    const record = JSON.parse(await readFile(path.resolve(flags['--materialize-case']), 'utf8'));
+    const materialized = await materializeQualificationCase(record, path.resolve(flags['--destination']));
+    io.stdout.write(`${JSON.stringify(materialized, null, 2)}\n`);
+    return 0;
+  }
+  if (flags['--extract-source']) {
+    if (flags['--case'] == null || flags['--destination'] == null) {
+      io.stderr.write('Missing --case ID and/or --destination DIR.\n');
+      return 2;
+    }
+    const extracted = await extractSource({
+      caseId: flags['--case'],
+      destination: path.resolve(flags['--destination']),
+    });
+    io.stdout.write(`${JSON.stringify(extracted, null, 2)}\n`);
+    return 0;
+  }
+  if (flags['--check-known-bad']) {
+    const packed = await loadQualificationCases();
+    const selected = flags['--case']
+      ? packed.raw.filter((entry) => entry.id === flags['--case'])
+      : packed.raw;
+    if (selected.length === 0) fail('unknown_case', `Unknown qualification case ${flags['--case']}.`);
+    const results = [];
+    for (const record of selected) results.push(await checkKnownBad(record));
+    io.stdout.write(`${JSON.stringify({ known_bad_failed: true, results }, null, 2)}\n`);
+    return 0;
+  }
+  if (flags['--evaluate-cohort']) {
+    if (flags['--trials'] == null || flags['--execution-manifest'] == null) {
+      io.stderr.write('Missing --trials FILE and/or --execution-manifest FILE.\n');
+      return 2;
+    }
+    const packed = await loadQualificationCases();
+    const trialsJson = JSON.parse(await readFile(path.resolve(flags['--trials']), 'utf8'));
+    const trials = Array.isArray(trialsJson) ? trialsJson : trialsJson.trials;
+    const usageReports = Array.isArray(trialsJson) ? null : (trialsJson.usage_reports ?? null);
+    const executionManifest = JSON.parse(await readFile(path.resolve(flags['--execution-manifest']), 'utf8'));
+    const comparison = evaluateQualificationCohort({
+      protocol: protocolRecord(),
+      cases: packed.raw,
+      trials,
+      executionManifest,
+      usageReports,
+    });
+    io.stdout.write(`${JSON.stringify(comparison, null, 2)}\n`);
+    if (comparison.decision === 'pass') return 0;
+    if (comparison.decision === 'fail') return 1;
+    return 2;
+  }
+  if (flags['--validate']) {
+    const summary = await validateQualification();
+    io.stdout.write(`${JSON.stringify(summary, null, 2)}\n`);
+    return 0;
+  }
+  io.stderr.write('Missing a known command.\n');
+  io.stderr.write(printUsage());
+  return 2;
+}
+
+const isMain = process.argv[1]
+  && path.resolve(process.argv[1]) === fileURLToPath(import.meta.url);
+if (isMain) {
+  main(process.argv.slice(2)).then((code) => {
+    process.exitCode = code;
+  }).catch((error) => {
+    process.stderr.write(`${error instanceof Error ? error.message : String(error)}\n`);
+    process.exitCode = 1;
+  });
+}
diff --git a/scripts/prepare-coengineer-qualification.test.mjs b/scripts/prepare-coengineer-qualification.test.mjs
new file mode 100644
index 0000000..576be04
--- /dev/null
+++ b/scripts/prepare-coengineer-qualification.test.mjs
@@ -0,0 +1,1104 @@
+import assert from 'node:assert/strict';
+import { mkdir, mkdtemp, readFile, rm } from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import test from 'node:test';
+import { fileURLToPath } from 'node:url';
+
+import {
+  loadCases,
+  parseTrial,
+} from './compare-coengineer-runs.mjs';
+import {
+  ASTRA_MODEL,
+  ASTRA_PROVIDER,
+  CASE_IDS,
+  DEADLINE_SOURCE_SHA,
+  EVIDENCE_DIGEST_DOMAIN,
+  FIVE_TOOLS,
+  HOST_USAGE_REPORT_SCHEMA_ID,
+  ORDERING_SEED,
+  OVERHEAD_REDUCTION,
+  PAID_CEILING_USD,
+  PLACEHOLDER_HOST_MODEL,
+  PUBLISHED_342_SHA,
+  QUALIFICATION_ARMS,
+  QUALIFICATION_CASE_SCHEMA_ID,
+  RESULT_SOURCE_SHA,
+  TURNAROUND_REDUCTION,
+  checkKnownBad,
+  evaluateQualificationCohort,
+  extractSource,
+  generateSchedule,
+  hostUsageTrialDigest,
+  loadQualificationCases,
+  main,
+  materializeQualificationCase,
+  packCase,
+  parseExecutionManifest,
+  parseHostUsageReport,
+  parseQualificationTrial,
+  protocolRecord,
+  scanOverlayLeakage,
+} from './prepare-coengineer-qualification.mjs';
+import { PUBLIC_MCP_TOOLS } from '../plugins/codex-co-engineer/mcp/v3/response.mjs';
+
+const ROOT = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..');
+const EXISTING_CASES = path.join(ROOT, 'benchmarks/cases');
+const QUAL_CASES = path.join(ROOT, 'benchmarks/qualification/cases');
+const QUAL_PROTOCOL = path.join(ROOT, 'benchmarks/qualification/protocol.json');
+const QUAL_MANIFEST = path.join(ROOT, 'benchmarks/qualification/operator-manifest.json');
+const CANDIDATE_FIXTURE_SHA = 'c0ffeeabc0ffeeabc0ffeeabc0ffeeabc0ffeeab';
+const PUBLISHED_FIXTURE_TREE = 'd0ffeeabc0ffeeabc0ffeeabc0ffeeabc0ffeeab';
+const HOST_MODEL = ASTRA_MODEL;
+const QUAL_FIXTURES = path.join(ROOT, 'benchmarks/qualification/fixtures');
+
+function io() {
+  const stdout = [];
+  const stderr = [];
+  return {
+    stdout: { write(text) { stdout.push(text); return true; }, text: () => stdout.join('') },
+    stderr: { write(text) { stderr.push(text); return true; }, text: () => stderr.join('') },
+    chunks: stdout,
+    errors: stderr,
+  };
+}
+
+function settings() {
+  return { reasoning: 'high', sandbox: 'workspace-write' };
+}
+
+function metric(value, source = 'host_measured') {
+  return {
+    value,
+    source,
+    trust: source === 'provider_report' ? 'provider_untrusted' : 'host_authoritative',
+  };
+}
+
+function unknownMetric() {
+  return { value: null, source: 'unknown', trust: 'unknown' };
+}
+
+function caseRoutes() {
+  return {
+    'acp-deadline-concurrent-cancel': {
+      implement: { provider: 'cursor-local', model: 'composer-1' },
+      review: { provider: 'grok', model: 'grok-4' },
+    },
+    'run-result-outcome-acceptance': {
+      implement: { provider: 'grok', model: 'grok-4' },
+      review: { provider: 'cursor-local', model: 'composer-1' },
+    },
+    'comparison-failed-helper-cumulative': {
+      implement: { provider: 'grok', model: 'grok-4' },
+      review: { provider: 'cursor-local', model: 'composer-1' },
+    },
+  };
+}
+
+function recordedManifest(cases) {
+  return {
+    schema: 'codex-co-engineer.qualification-execution-manifest.v1',
+    version: 1,
+    status: 'recorded',
+    candidate: { sha: CANDIDATE_FIXTURE_SHA, tree: PUBLISHED_FIXTURE_TREE },
+    published_3_4_2: { sha: PUBLISHED_342_SHA },
+    host: {
+      host_model: HOST_MODEL,
+      host_settings: settings(),
+    },
+    astra: { provider: ASTRA_PROVIDER, model: ASTRA_MODEL },
+    provider_configuration: caseRoutes(),
+    approaches: {
+      'native-codex': { external_jobs: false },
+      'published-3.4.2': { external_jobs: true },
+      'candidate-3.4.3': { external_jobs: true },
+      'direct-delegation': { external_jobs: true },
+    },
+    input_digests: Object.fromEntries(cases.map((entry) => [entry.id, entry.input_digest])),
+    check_digests: Object.fromEntries(cases.map((entry) => [entry.id, entry.check_digest])),
+  };
+}
+
+function makeTrial(plan, caseRecord, manifest, {
+  accepted = true,
+  nativeOutput = 40,
+  wall = 1000,
+  failedThenCorrect = false,
+  helper = false,
+  hostModel = manifest.host.host_model,
+  inputDigest = caseRecord.input_digest,
+  source = null,
+  providerConfiguration = null,
+} = {}) {
+  const attempts = [];
+  if (failedThenCorrect) {
+    attempts.push({
+      attempt_id: 'initial',
+      kind: 'initial',
+      outcome: 'failed',
+      sequence: 1,
+      usage: {
+        native_input_tokens: metric(0),
+        native_output_tokens: metric(10),
+        native_helper_calls: metric(0),
+        correction_rounds: metric(0),
+        elapsed_ms: metric(400),
+      },
+    });
+    attempts.push({
+      attempt_id: 'correction',
+      kind: 'correction',
+      outcome: accepted ? 'accepted' : 'failed',
+      sequence: 2,
+      usage: {
+        native_input_tokens: metric(0),
+        native_output_tokens: metric(Math.max(0, nativeOutput - 10)),
+        native_helper_calls: metric(0),
+        correction_rounds: metric(1),
+        elapsed_ms: metric(800),
+      },
+    });
+  } else {
+    attempts.push({
+      attempt_id: 'initial',
+      kind: 'initial',
+      outcome: accepted ? 'accepted' : 'failed',
+      sequence: 1,
+      usage: {
+        native_input_tokens: metric(0),
+        native_output_tokens: metric(helper ? Math.max(0, nativeOutput - 8) : nativeOutput),
+        native_helper_calls: metric(0),
+        correction_rounds: metric(0),
+        elapsed_ms: metric(1000),
+      },
+    });
+  }
+  if (helper) {
+    attempts.push({
+      attempt_id: 'helper',
+      kind: 'native_helper',
+      outcome: 'accepted',
+      sequence: attempts.length + 1,
+      usage: {
+        native_input_tokens: metric(0),
+        native_helper_calls: metric(1),
+        native_output_tokens: metric(8),
+        correction_rounds: metric(0),
+        elapsed_ms: metric(200),
+      },
+    });
+  }
+  const armSource = source ?? (plan.arm === 'native-codex'
+    ? { kind: 'native', value: 'native-codex' }
+    : {
+      kind: 'git_commit',
+      value: plan.arm === 'published-3.4.2' ? manifest.published_3_4_2.sha : manifest.candidate.sha,
+    });
+  const route = providerConfiguration ?? (plan.arm === 'native-codex'
+    ? { implement: 'native' }
+    : manifest.provider_configuration[plan.case_id]);
+  return {
+    schema: 'codex-co-engineer.benchmark-trial.v1',
+    trial_id: plan.trial_id,
+    case_id: plan.case_id,
+    arm: plan.arm,
+    base_sha: caseRecord.base_sha,
+    input_digest: inputDigest,
+    coengineer_source: armSource,
+    host_model: hostModel,
+    host_settings: manifest.host.host_settings,
+    provider_configuration: route,
+    accepted,
+    wall_elapsed_ms: metric(wall),
+    attempts,
+    ...(helper ? { native_parent_excludes_helpers: true } : {}),
+  };
+}
+
+function modelRow(model, inputTokens, outputTokens) {
+  return {
+    model,
+    input_tokens: inputTokens,
+    cached_input_tokens: 0,
+    cache_write_input_tokens: 0,
+    output_tokens: outputTokens,
+    reasoning_output_tokens: 0,
+    total_tokens: inputTokens + outputTokens,
+  };
+}
+
+function makeUsageReport(trial, {
+  status = 'complete',
+  astraOutput = null,
+  helperModel = 'helper-model-x',
+} = {}) {
+  const attempts = trial.attempts.map((attempt) => {
+    const nativeOut = attempt.usage.native_output_tokens?.value ?? 0;
+    const nativeIn = attempt.usage.native_input_tokens?.value ?? 0;
+    const isHelper = attempt.kind === 'native_helper';
+    const byModel = [];
+    if (isHelper) {
+      byModel.push(modelRow(helperModel, nativeIn, nativeOut));
+    } else {
+      const astraOut = astraOutput == null ? nativeOut : Math.min(astraOutput, nativeOut);
+      byModel.push(modelRow(ASTRA_MODEL, nativeIn, astraOut));
+      if (astraOut !== nativeOut) {
+        byModel.push(modelRow(helperModel, 0, nativeOut - astraOut));
+      }
+    }
+    return {
+      attempt_id: attempt.attempt_id,
+      session_id: isHelper ? 'helper-session' : 'parent-session',
+      input_tokens: nativeIn,
+      cached_input_tokens: 0,
+      cache_write_input_tokens: 0,
+      output_tokens: nativeOut,
+      reasoning_output_tokens: 0,
+      compaction_events: 0,
+      by_model: byModel,
+    };
+  });
+  const clonedTrial = structuredClone(trial);
+  return {
+    schema: HOST_USAGE_REPORT_SCHEMA_ID,
+    status,
+    trial: clonedTrial,
+    breakdown: {
+      attempts,
+      totals: {
+        input_tokens: attempts.reduce((sum, row) => sum + (row.input_tokens ?? 0), 0),
+        cached_input_tokens: 0,
+        cache_write_input_tokens: 0,
+        output_tokens: attempts.reduce((sum, row) => sum + (row.output_tokens ?? 0), 0),
+        reasoning_output_tokens: 0,
+        compaction_events: 0,
+      },
+      accounting: {
+        response_id_deduped: true,
+        response_identity: 'session_and_response',
+        phase_endpoints: 'start_inclusive_end_exclusive_unless_terminal',
+        compaction_counted_once: true,
+        reasoning_included_in_output: true,
+        cache_counters_separate: true,
+        secondary_token_count: 'non_authoritative',
+        native_parent_excludes_helpers: trial.native_parent_excludes_helpers === true,
+        walked_sessions: [...new Set(attempts.map((row) => row.session_id))],
+        acceptance_unknown: !Object.hasOwn(trial, 'accepted'),
+        measurement_incomplete: status !== 'complete',
+      },
+    },
+    evidence: {
+      digests: {
+        manifest: 'ab'.repeat(32),
+        sessions: Object.fromEntries(attempts.map((row) => [row.session_id, '11'.repeat(32)])),
+        links: [],
+        trial: hostUsageTrialDigest(clonedTrial),
+      },
+      notes: status === 'inconclusive' ? ['absent_session:helper-session'] : [],
+      incomplete_primary_evidence: status !== 'complete',
+    },
+  };
+}
+
+function cohortReports(trials, customize = {}) {
+  return trials.map((trial) => {
+    const key = `${trial.case_id}:${trial.arm}:r${trial.trial_id.slice(-1)}`;
+    const override = customize[key] ?? customize[trial.trial_id] ?? customize[trial.arm] ?? {};
+    return makeUsageReport(trial, override);
+  });
+}
+
+function nullHostCounters(row) {
+  row.input_tokens = null;
+  row.cached_input_tokens = null;
+  row.cache_write_input_tokens = null;
+  row.output_tokens = null;
+  row.reasoning_output_tokens = null;
+  row.compaction_events = null;
+}
+
+function importerShapedIncompleteAstra40(trial) {
+  const cloned = structuredClone(trial);
+  for (const attempt of cloned.attempts) {
+    attempt.usage.native_input_tokens = unknownMetric();
+    attempt.usage.native_output_tokens = unknownMetric();
+  }
+  const report = makeUsageReport(cloned, { status: 'inconclusive' });
+  report.trial = cloned;
+  report.breakdown.accounting.measurement_incomplete = true;
+  report.breakdown.totals = {
+    input_tokens: null,
+    cached_input_tokens: null,
+    cache_write_input_tokens: null,
+    output_tokens: null,
+    reasoning_output_tokens: null,
+    compaction_events: null,
+  };
+  const parent = report.breakdown.attempts[0];
+  nullHostCounters(parent);
+  parent.by_model = [modelRow(ASTRA_MODEL, 80, 40)];
+  const helper = report.breakdown.attempts.find((row) => row.attempt_id === 'helper');
+  if (helper) {
+    nullHostCounters(helper);
+    helper.by_model = [];
+    helper.session_id = 'helper-session';
+  }
+  report.evidence.notes = ['absent_session:helper-session'];
+  report.evidence.incomplete_primary_evidence = true;
+  report.evidence.digests.trial = hostUsageTrialDigest(cloned);
+  return { trial: cloned, report };
+}
+
+function evaluateCohort(packed, manifest, trials, extra = {}) {
+  const { reportCustomize, usageReports, ...rest } = extra;
+  return evaluateQualificationCohort({
+    protocol: protocolRecord(),
+    cases: packed.raw,
+    trials,
+    executionManifest: manifest,
+    usageReports: usageReports ?? cohortReports(trials, reportCustomize),
+    ...rest,
+  });
+}
+
+function cohortTrials(cases, manifest, customize = {}) {
+  const schedule = generateSchedule();
+  const caseById = new Map(cases.map((entry) => [entry.id, entry]));
+  return schedule.canonical.map((plan) => {
+    const key = `${plan.case_id}:${plan.arm}:r${plan.rep}`;
+    const override = customize[key] ?? customize[plan.case_id] ?? customize[plan.arm] ?? {};
+    const defaults = {
+      accepted: true,
+      nativeOutput: plan.arm === 'native-codex' ? 100 : plan.arm === 'published-3.4.2' ? 80 : 40,
+      wall: plan.arm === 'candidate-3.4.3' ? 1500 : plan.arm === 'native-codex' ? 1000 : 900,
+      failedThenCorrect: plan.arm === 'candidate-3.4.3' && plan.rep === 1,
+      helper: plan.arm === 'native-codex' && plan.rep === 1,
+    };
+    return makeTrial(plan, caseById.get(plan.case_id), manifest, { ...defaults, ...override });
+  });
+}
+
+test('existing four comparator fixtures still load unchanged', async () => {
+  const cases = await loadCases(EXISTING_CASES);
+  assert.equal(cases.length, 4);
+  assert.deepEqual(cases.map((entry) => entry.id).sort(), [
+    'failing-check-then-fix',
+    'independent-review',
+    'review-driven-correction',
+    'single-file-bugfix',
+  ]);
+  assert.deepEqual([...PUBLIC_MCP_TOOLS], [...FIVE_TOOLS]);
+});
+
+test('packed qualification cases bind real source SHAs without future candidate identity', async () => {
+  const packed = await loadQualificationCases();
+  assert.equal(packed.raw.length, 3);
+  assert.deepEqual(packed.raw.map((entry) => entry.id), [...CASE_IDS]);
+  assert.equal(packed.raw[0].source_sha, DEADLINE_SOURCE_SHA);
+  assert.equal(packed.raw[0].source_sha, PUBLISHED_342_SHA);
+  assert.equal(packed.raw[1].source_sha, RESULT_SOURCE_SHA);
+  assert.equal(packed.raw[2].source_sha, RESULT_SOURCE_SHA);
+  for (const record of packed.raw) {
+    assert.equal(record.schema, QUALIFICATION_CASE_SCHEMA_ID);
+    assert.equal(record.status, 'unrun');
+    assert.equal(record.retrospective, true);
+    assert.equal(Object.hasOwn(record, 'candidate_sha'), false);
+    assert.equal(record.comparable == null, true);
+    assert.match(record.base_sha, /^[0-9a-f]{40}$/u);
+    assert.match(record.input_digest, /^[0-9a-f]{64}$/u);
+    assert.match(record.check_digest, /^[0-9a-f]{64}$/u);
+    assert.equal(Object.hasOwn(record.overlay.files, 'TASK.md'), true);
+    assert.equal(Object.hasOwn(record.overlay.files, record.acceptance.checks[0].command[2]), true);
+    assert.equal(Object.hasOwn(record.overlay.files, 'turn-runner.mjs'), false);
+    assert.equal(Object.hasOwn(record.overlay.files, 'project-result.mjs'), false);
+    assert.equal(Object.hasOwn(record.overlay.files, 'account-trials.mjs'), false);
+    scanOverlayLeakage(record.overlay.files);
+  }
+});
+
+test('materializeQualificationCase is reproducible and rejects a second write', async () => {
+  const packed = await loadQualificationCases();
+  const record = packed.raw.find((entry) => entry.id === 'run-result-outcome-acceptance');
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-qual-mat-'));
+  try {
+    const dest1 = path.join(root, 'a');
+    const dest2 = path.join(root, 'b');
+    await mkdir(dest1);
+    await mkdir(dest2);
+    const first = await materializeQualificationCase(record, dest1);
+    const second = await materializeQualificationCase(record, dest2);
+    assert.equal(first.base_sha, record.base_sha);
+    assert.equal(second.base_sha, record.base_sha);
+    assert.equal(first.input_digest, record.input_digest);
+    const evidence = await readFile(
+      path.join(dest1, 'plugins/codex-co-engineer/mcp/v3/run-result-evidence.mjs'),
+      'utf8',
+    );
+    assert.equal(evidence.includes('projectRunResultEvidenceV1'), true);
+    await assert.rejects(() => materializeQualificationCase(record, dest1), { code: 'destination_not_empty' });
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('stale source, digest, placeholder, and candidate identities are rejected', async () => {
+  const packed = await loadQualificationCases();
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-qual-stale-'));
+  try {
+    const candidateAsSource = structuredClone(packed.raw[0]);
+    candidateAsSource.source_sha = CANDIDATE_FIXTURE_SHA;
+    await mkdir(path.join(root, 'candidate'));
+    await assert.rejects(
+      () => materializeQualificationCase(candidateAsSource, path.join(root, 'candidate')),
+      { code: 'stale_identity' },
+    );
+
+    const digestTamper = structuredClone(packed.raw[0]);
+    digestTamper.input_digest = 'ab'.repeat(32);
+    await mkdir(path.join(root, 'digest'));
+    await assert.rejects(
+      () => materializeQualificationCase(digestTamper, path.join(root, 'digest')),
+      { code: 'stale_identity' },
+    );
+
+    const shaTamper = structuredClone(packed.raw[1]);
+    shaTamper.source_sha = PUBLISHED_342_SHA;
+    await mkdir(path.join(root, 'source'));
+    await assert.rejects(
+      () => materializeQualificationCase(shaTamper, path.join(root, 'source')),
+      { code: 'stale_identity' },
+    );
+
+    const boundCandidate = structuredClone(packed.raw[0]);
+    boundCandidate.candidate_sha = CANDIDATE_FIXTURE_SHA;
+    await mkdir(path.join(root, 'future'));
+    await assert.rejects(
+      () => materializeQualificationCase(boundCandidate, path.join(root, 'future')),
+      { code: 'stale_identity' },
+    );
+
+    const placeholder = structuredClone(packed.raw[0]);
+    placeholder.comparable = { host_model: PLACEHOLDER_HOST_MODEL, host_settings: settings() };
+    await mkdir(path.join(root, 'placeholder'));
+    await assert.rejects(
+      () => materializeQualificationCase(placeholder, path.join(root, 'placeholder')),
+      { code: 'identity_mismatch' },
+    );
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('acceptance fails on the known-bad source for every retrospective case', { timeout: 180_000 }, async () => {
+  const packed = await loadQualificationCases();
+  for (const record of packed.raw) {
+    const result = await checkKnownBad(record);
+    assert.equal(result.failed, true);
+    assert.notEqual(result.exit, 0);
+  }
+});
+
+test('worker overlay does not leak solutions or extra paths', async () => {
+  const packed = await loadQualificationCases();
+  for (const record of packed.raw) {
+    scanOverlayLeakage(record.overlay.files);
+    assert.equal(Object.hasOwn(record.overlay.files, 'solution.mjs'), false);
+    for (const text of Object.values(record.overlay.files)) {
+      assert.equal(text.includes(CANDIDATE_FIXTURE_SHA), false);
+      assert.equal(text.includes('AsyncLocalStorage'), false);
+      assert.equal(text.includes('timeoutMs: 0'), false);
+    }
+  }
+  const leaked = structuredClone(packed.raw[0].overlay.files);
+  leaked['TASK.md'] += '\nSee AsyncLocalStorage in the later fix.\n';
+  assert.throws(() => scanOverlayLeakage(leaked), { code: 'solution_leakage' });
+});
+
+test('extract-source copies only the immutable allowlist from the pre-fix SHA', async () => {
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-qual-ex-'));
+  try {
+    const dest = path.join(root, 'src');
+    const extracted = await extractSource({
+      caseId: 'comparison-failed-helper-cumulative',
+      destination: dest,
+    });
+    assert.equal(extracted.source_sha, RESULT_SOURCE_SHA);
+    assert.equal(extracted.worker_context, false);
+    assert.equal(extracted.contains_solution, false);
+    assert.deepEqual(extracted.files, [
+      'plugins/codex-co-engineer/mcp/v3/assignment-manifest.mjs',
+      'plugins/codex-co-engineer/mcp/v3/contract.mjs',
+      'plugins/codex-co-engineer/mcp/v3/grammar.mjs',
+      'plugins/codex-co-engineer/mcp/v3/identity.mjs',
+      'plugins/codex-co-engineer/mcp/v3/prompt-compiler.mjs',
+      'plugins/codex-co-engineer/mcp/v3/repo-path-matcher.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-manifest.mjs',
+      'plugins/codex-co-engineer/mcp/v3/run-policy.mjs',
+      'scripts/compare-coengineer-runs.mjs',
+    ]);
+    const text = await readFile(path.join(dest, 'scripts/compare-coengineer-runs.mjs'), 'utf8');
+    assert.equal(text.includes('export async function materializeCase'), false);
+    await assert.rejects(() => extractSource({
+      caseId: 'comparison-failed-helper-cumulative',
+      destination: dest,
+    }), { code: 'destination_not_empty' });
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('seed 43 schedule has 24 unrun required-arm trials and live jobs are refused', async () => {
+  const schedule = generateSchedule(ORDERING_SEED);
+  assert.equal(schedule.trial_count, 24);
+  assert.equal(schedule.ordered.length, 24);
+  assert.equal(schedule.algorithm, 'mulberry32-fisher-yates-grouped-by-case-rep-then-approach-positions');
+  assert.equal(schedule.ordered.every((row) => row.status === 'unrun'), true);
+  assert.equal(schedule.ordered.every((row) => row.retrospective === true), true);
+  assert.equal(new Set(schedule.ordered.map((row) => row.trial_id)).size, 24);
+  assert.equal(schedule.ordered.every((row) => row.trial_id.includes('.') === false), true);
+  assert.equal(new Set(schedule.canonical.map((row) => row.case_id)).size, 3);
+  for (const arm of QUALIFICATION_ARMS) {
+    assert.equal(schedule.canonical.filter((row) => row.arm === arm).length, 6);
+  }
+  const firstFour = schedule.ordered.slice(0, 4);
+  assert.equal(new Set(firstFour.map((row) => `${row.case_id}:${row.rep}`)).size, 1);
+  assert.deepEqual([...new Set(firstFour.map((row) => row.arm))].sort(), [...QUALIFICATION_ARMS].sort());
+  assert.deepEqual([...new Set(schedule.canonical.map((row) => row.arm))].sort(), [...QUALIFICATION_ARMS].sort());
+  const groupOrders = [];
+  for (let index = 0; index < schedule.ordered.length; index += 4) {
+    const group = schedule.ordered.slice(index, index + 4);
+    assert.equal(new Set(group.map((row) => `${row.case_id}:${row.rep}`)).size, 1);
+    assert.equal(new Set(group.map((row) => row.arm)).size, 4);
+    groupOrders.push(group.map((row) => row.arm).join(','));
+  }
+  assert.ok(new Set(groupOrders).size > 1);
+  assert.ok(groupOrders.some((order) => order !== QUALIFICATION_ARMS.join(',')));
+  const reshuffled = generateSchedule(ORDERING_SEED);
+  assert.deepEqual(reshuffled.ordered, schedule.ordered);
+  assert.equal(reshuffled.algorithm, schedule.algorithm);
+  assert.notDeepEqual(schedule.ordered.map((row) => row.trial_id), schedule.canonical.map((row) => row.trial_id));
+  const writtenProtocol = JSON.parse(await readFile(QUAL_PROTOCOL, 'utf8'));
+  const writtenManifest = JSON.parse(await readFile(QUAL_MANIFEST, 'utf8'));
+  assert.equal(writtenProtocol.ordering.algorithm, schedule.algorithm);
+  assert.equal(writtenManifest.ordering.algorithm, schedule.algorithm);
+  assert.deepEqual(writtenManifest.schedule, schedule.ordered);
+
+  const captured = io();
+  const live = await main(['--live', '--paid-budget', String(PAID_CEILING_USD)], captured);
+  assert.equal(live, 2);
+  assert.equal(captured.stderr.text().includes('Live provider jobs are not implemented'), true);
+  const unknown = await main(['--bogus'], captured);
+  assert.equal(unknown, 2);
+});
+
+test('CLI validates packed cases and materializes through the public helper', async () => {
+  const captured = io();
+  const validated = await main(['--validate'], captured);
+  assert.equal(validated, 0);
+  assert.equal(captured.stdout.text().includes('acp-deadline-concurrent-cancel'), true);
+  const scheduled = await main(['--schedule'], captured);
+  assert.equal(scheduled, 0);
+  assert.equal(captured.stdout.text().includes('"seed": 43'), true);
+  assert.equal(captured.stdout.text().includes('candidate_sha'), false);
+
+  const root = await mkdtemp(path.join(os.tmpdir(), 'ce-qual-cli-'));
+  try {
+    const dest = path.join(root, 'case');
+    const code = await main([
+      '--materialize-case',
+      path.join(QUAL_CASES, 'acp-deadline-concurrent-cancel.json'),
+      '--destination',
+      dest,
+    ], captured);
+    assert.equal(code, 0);
+    const task = await readFile(path.join(dest, 'TASK.md'), 'utf8');
+    assert.equal(task.includes('checks/deadline-concurrent.test.mjs'), true);
+    const check = await readFile(path.join(dest, 'checks/deadline-concurrent.test.mjs'), 'utf8');
+    assert.equal(check.includes('runAcpTask'), true);
+  } finally {
+    await rm(root, { recursive: true, force: true });
+  }
+});
+
+test('packCase keeps qualification identity without fictional hashes or future SHAs', async () => {
+  const packed = await packCase('acp-deadline-concurrent-cancel');
+  assert.equal(packed.source_sha, PUBLISHED_342_SHA);
+  assert.match(packed.base_sha, /^[0-9a-f]{40}$/u);
+  assert.notEqual(packed.base_sha, packed.source_sha);
+  assert.equal(Object.hasOwn(packed, 'candidate_sha'), false);
+  assert.equal(packed.schema, QUALIFICATION_CASE_SCHEMA_ID);
+  const planned = generateSchedule().canonical.find((row) => row.arm === 'candidate-3.4.3');
+  assert.equal(planned.trial_id.includes('.'), false);
+  const trialBody = {
+    schema: 'codex-co-engineer.benchmark-trial.v1',
+    trial_id: planned.trial_id,
+    case_id: packed.id,
+    arm: 'candidate-3.4.3',
+    base_sha: packed.base_sha,
+    input_digest: packed.input_digest,
+    coengineer_source: { kind: 'git_commit', value: CANDIDATE_FIXTURE_SHA },
+    host_model: HOST_MODEL,
+    host_settings: settings(),
+    provider_configuration: caseRoutes()[packed.id],
+    accepted: true,
+    wall_elapsed_ms: metric(1000),
+    attempts: [{
+      attempt_id: 'initial',
+      kind: 'initial',
+      outcome: 'accepted',
+      usage: { native_output_tokens: metric(10) },
+    }],
+  };
+  const parsedTrial = parseQualificationTrial(trialBody);
+  assert.equal(parsedTrial.trial_id, planned.trial_id);
+  assert.equal(parseTrial(trialBody).trial_id, planned.trial_id);
+  assert.throws(() => parseTrial({
+    ...trialBody,
+    trial_id: `${packed.id}-candidate-3.4.3-r1`,
+  }), { code: 'invalid_format' });
+});
+
+test('tracked protocol requires all four arms and leaves candidate identity external', async () => {
+  const protocol = protocolRecord();
+  assert.deepEqual(protocol.approaches, [...QUALIFICATION_ARMS]);
+  assert.deepEqual(protocol.arms.required, [...QUALIFICATION_ARMS]);
+  assert.deepEqual(protocol.arms.optional, []);
+  assert.equal(Object.hasOwn(protocol, 'candidate_sha'), false);
+  assert.equal(protocol.execution_identity.bound_in, 'external_execution_manifest');
+  const written = JSON.parse(await readFile(QUAL_PROTOCOL, 'utf8'));
+  assert.equal(Object.hasOwn(written, 'candidate_sha'), false);
+  assert.equal(written.arms.optional.length, 0);
+  const manifest = JSON.parse(await readFile(QUAL_MANIFEST, 'utf8'));
+  assert.equal(Object.hasOwn(manifest, 'candidate_sha'), false);
+  assert.equal(manifest.schedule.length, 24);
+  assert.throws(() => parseExecutionManifest({
+    schema: 'codex-co-engineer.qualification-execution-manifest.v1',
+    status: 'recorded',
+    candidate: { sha: CANDIDATE_FIXTURE_SHA },
+    published_3_4_2: { sha: PUBLISHED_342_SHA },
+    host: { host_model: PLACEHOLDER_HOST_MODEL, host_settings: settings() },
+    astra: { provider: ASTRA_PROVIDER, model: ASTRA_MODEL },
+    provider_configuration: { implement: 'grok' },
+    approaches: {
+      'native-codex': { external_jobs: false },
+      'published-3.4.2': { external_jobs: true },
+      'candidate-3.4.3': { external_jobs: true },
+      'direct-delegation': { external_jobs: true },
+    },
+  }), { code: 'identity_mismatch' });
+  const cases = await loadQualificationCases();
+  const recorded = recordedManifest(cases.raw);
+  delete recorded.candidate.tree;
+  assert.throws(() => parseExecutionManifest(recorded), { code: 'missing_key' });
+  recorded.candidate.tree = PUBLISHED_FIXTURE_TREE;
+  recorded.provider_configuration = {
+    implement: { provider: 'grok', model: 'grok-4' },
+    review: { provider: 'cursor-local', model: 'composer-1' },
+  };
+  assert.throws(() => parseExecutionManifest(recorded), { code: 'identity_mismatch' });
+});
+
+test('evaluator accepts 6/6 with task-level medians, Astra decrease, failures, corrections, and helpers', async () => {
+  const packed = await loadQualificationCases();
+  const manifest = recordedManifest(packed.raw);
+  const trials = cohortTrials(packed.raw, manifest);
+  const comparison = evaluateCohort(packed, manifest, trials);
+  assert.equal(comparison.decision, 'pass');
+  assert.equal(comparison.candidate_accepted, '6/6');
+  assert.equal(comparison.compared_identities, 24);
+  assert.ok(comparison.metrics.task_median_native_output_per_accepted_vs_native <= 0.5);
+  assert.ok(comparison.metrics.task_median_native_output_per_accepted_vs_published <= 0.75);
+  assert.equal(comparison.metrics.astra_own_native_output.decreased, true);
+  assert.ok(comparison.metrics.median_turnaround_vs_native <= 2);
+  assert.ok(comparison.metrics.native_overhead_vs_direct <= 1.25);
+  assert.equal(comparison.metrics.median_turnaround_reduction, TURNAROUND_REDUCTION);
+  assert.equal(comparison.metrics.native_overhead_reduction, OVERHEAD_REDUCTION);
+  const candidateArm = comparison.cases[0].arms['candidate-3.4.3'];
+  assert.ok(candidateArm.failed_attempt_count >= 1);
+  assert.ok(candidateArm.correction_count >= 1);
+  const nativeArm = comparison.cases[0].arms['native-codex'];
+  assert.ok(nativeArm.native_helper_count >= 1);
+  assert.equal(nativeArm.astra_own_native_output.includes_helpers, false);
+});
+
+test('evaluator uses task-level median rather than a pooled ratio', async () => {
+  const packed = await loadQualificationCases();
+  const manifest = recordedManifest(packed.raw);
+  const byCase = {
+    'acp-deadline-concurrent-cancel': { nativeOutput: 10, astraOutput: 20 },
+    'run-result-outcome-acceptance': { nativeOutput: 60, astraOutput: 20 },
+    'comparison-failed-helper-cumulative': { nativeOutput: 70, astraOutput: 20 },
+  };
+  const trials = cohortTrials(packed.raw, manifest, {
+    'candidate-3.4.3': {},
+  }).map((trial) => {
+    if (trial.arm !== 'candidate-3.4.3') return trial;
+    const plan = { trial_id: trial.trial_id, case_id: trial.case_id, arm: trial.arm, rep: 1 };
+    const caseRecord = packed.raw.find((entry) => entry.id === trial.case_id);
+    return makeTrial(plan, caseRecord, manifest, {
+      accepted: true,
+      nativeOutput: byCase[trial.case_id].nativeOutput,
+      wall: 1500,
+      failedThenCorrect: false,
+    });
+  });
+  const comparison = evaluateCohort(packed, manifest, trials);
+  assert.equal(comparison.decision, 'fail');
+  assert.equal(comparison.reasons.includes('task_median_vs_native_exceeds_0.5'), true);
+  assert.ok(comparison.metrics.task_median_native_output_per_accepted_vs_native > 0.5);
+  assert.ok(comparison.metrics.pooled_native_output_per_accepted_vs_native <= 0.5);
+});
+
+test('missing arms, missing acceptance, missing primary, and mismatched identities are inconclusive', async () => {
+  const packed = await loadQualificationCases();
+  const manifest = recordedManifest(packed.raw);
+
+  const omittedDirect = cohortTrials(packed.raw, manifest)
+    .filter((trial) => trial.arm !== 'direct-delegation');
+  const missingArm = evaluateCohort(packed, manifest, omittedDirect);
+  assert.equal(missingArm.decision, 'inconclusive');
+  assert.equal(missingArm.reasons.some((reason) => reason.startsWith('omitted:')), true);
+
+  const missingAcceptanceTrials = cohortTrials(packed.raw, manifest);
+  delete missingAcceptanceTrials[0].accepted;
+  const missingAcceptance = evaluateCohort(packed, manifest, missingAcceptanceTrials);
+  assert.equal(missingAcceptance.decision, 'inconclusive');
+  assert.equal(missingAcceptance.reasons.some((reason) => reason.startsWith('missing_acceptance:')), true);
+
+  const missingPrimaryTrials = cohortTrials(packed.raw, manifest);
+  missingPrimaryTrials[0].wall_elapsed_ms = { value: null, source: 'unknown', trust: 'unknown' };
+  const missingPrimary = evaluateCohort(packed, manifest, missingPrimaryTrials);
+  assert.equal(missingPrimary.decision, 'inconclusive');
+  assert.equal(missingPrimary.reasons.some((reason) => reason.startsWith('missing_primary:')), true);
+
+  const mismatchedTrials = cohortTrials(packed.raw, manifest);
+  mismatchedTrials[0].host_model = 'other-host-model';
+  const mismatched = evaluateCohort(packed, manifest, mismatchedTrials);
+  assert.equal(mismatched.decision, 'inconclusive');
+  assert.equal(mismatched.reasons.some((reason) => reason.includes('host_model_mismatch')), true);
+
+  const digestMismatchTrials = cohortTrials(packed.raw, manifest);
+  digestMismatchTrials[1].input_digest = 'ab'.repeat(32);
+  const digestMismatch = evaluateCohort(packed, manifest, digestMismatchTrials);
+  assert.equal(digestMismatch.decision, 'inconclusive');
+  assert.equal(digestMismatch.reasons.some((reason) => reason.includes('input_digest_mismatch')), true);
+
+  const wrongRouteTrials = cohortTrials(packed.raw, manifest);
+  const acpTrial = wrongRouteTrials.find((trial) => (
+    trial.case_id === 'acp-deadline-concurrent-cancel' && trial.arm === 'candidate-3.4.3'
+  ));
+  acpTrial.provider_configuration = caseRoutes()['run-result-outcome-acceptance'];
+  const wrongRoute = evaluateCohort(packed, manifest, wrongRouteTrials);
+  assert.equal(wrongRoute.decision, 'inconclusive');
+  assert.equal(wrongRoute.reasons.some((reason) => reason.includes('provider_configuration_mismatch')), true);
+});
+
+test('candidate not 6/6 accepted fails when identities are otherwise comparable', async () => {
+  const packed = await loadQualificationCases();
+  const manifest = recordedManifest(packed.raw);
+  let flipped = false;
+  const trials = cohortTrials(packed.raw, manifest).map((trial) => {
+    if (!flipped && trial.arm === 'candidate-3.4.3') {
+      flipped = true;
+      const caseRecord = packed.raw.find((entry) => entry.id === trial.case_id);
+      return makeTrial(trial, caseRecord, manifest, {
+        accepted: false,
+        nativeOutput: 40,
+        wall: 1500,
+        failedThenCorrect: false,
+      });
+    }
+    return trial;
+  });
+  const comparison = evaluateCohort(packed, manifest, trials);
+  assert.equal(comparison.decision, 'fail');
+  assert.equal(comparison.reasons.includes('candidate_not_6_of_6_accepted'), true);
+  assert.equal(comparison.candidate_accepted, '5/6');
+});
+
+test('unrecorded execution manifest is inconclusive and does not invent identities', async () => {
+  const packed = await loadQualificationCases();
+  const comparison = evaluateQualificationCohort({
+    protocol: protocolRecord(),
+    cases: packed.raw,
+    trials: [],
+    executionManifest: {
+      schema: 'codex-co-engineer.qualification-execution-manifest.v1',
+      status: 'unrecorded',
+      candidate: null,
+      host: null,
+      astra: null,
+    },
+  });
+  assert.equal(comparison.decision, 'inconclusive');
+  assert.deepEqual(comparison.reasons, ['execution_manifest_unrecorded']);
+});
+
+test('overhead uses candidate/direct native output, not wall time', async () => {
+  const packed = await loadQualificationCases();
+  const manifest = recordedManifest(packed.raw);
+  const trials = cohortTrials(packed.raw, manifest, {
+    'native-codex': { nativeOutput: 1000, wall: 1000 },
+    'published-3.4.2': { nativeOutput: 800, wall: 1000 },
+    'candidate-3.4.3': { nativeOutput: 400, wall: 1000, failedThenCorrect: false },
+    'direct-delegation': { nativeOutput: 100, wall: 1000 },
+  });
+  const comparison = evaluateCohort(packed, manifest, trials);
+  assert.equal(comparison.metrics.native_overhead_vs_direct, 4);
+  assert.equal(comparison.decision, 'fail');
+  assert.equal(comparison.reasons.includes('native_overhead_exceeds_1.25x_direct'), true);
+  assert.equal(comparison.metrics.median_turnaround_vs_native, 1);
+});
+
+test('turnaround is the median of per-trial wall ratios, not the ratio of summed walls', async () => {
+  const packed = await loadQualificationCases();
+  const manifest = recordedManifest(packed.raw);
+  const schedule = generateSchedule();
+  const caseById = new Map(packed.raw.map((entry) => [entry.id, entry]));
+  const trials = schedule.canonical.map((plan) => {
+    const walls = {
+      'native-codex': plan.rep === 1 ? 1000 : 4000,
+      'candidate-3.4.3': plan.rep === 1 ? 4000 : 1000,
+      'published-3.4.2': 900,
+      'direct-delegation': 900,
+    };
+    return makeTrial(plan, caseById.get(plan.case_id), manifest, {
+      accepted: true,
+      nativeOutput: plan.arm === 'native-codex' ? 100 : 40,
+      wall: walls[plan.arm],
+      failedThenCorrect: false,
+      helper: false,
+    });
+  });
+  const comparison = evaluateCohort(packed, manifest, trials);
+  assert.equal(comparison.metrics.median_turnaround_vs_native, 2.125);
+  assert.equal(comparison.decision, 'fail');
+  assert.equal(comparison.reasons.includes('median_turnaround_exceeds_2x_native'), true);
+  const summedRatio = (4000 + 1000) / (1000 + 4000);
+  assert.equal(summedRatio, 1);
+  assert.ok(comparison.metrics.median_turnaround_vs_native > summedRatio);
+});
+
+test('missing helper usage report stays inconclusive and keeps measured numbers', async () => {
+  const packed = await loadQualificationCases();
+  const manifest = recordedManifest(packed.raw);
+  const trials = cohortTrials(packed.raw, manifest);
+  const reports = cohortReports(trials);
+  const helperTrial = trials.find((trial) => trial.attempts.some((attempt) => attempt.kind === 'native_helper'));
+  const report = reports.find((entry) => entry.trial.trial_id === helperTrial.trial_id);
+  report.status = 'inconclusive';
+  report.evidence.incomplete_primary_evidence = true;
+  report.evidence.notes = ['absent_session:helper-session'];
+  const comparison = evaluateCohort(packed, manifest, trials, { usageReports: reports });
+  assert.equal(comparison.decision, 'inconclusive');
+  assert.equal(comparison.reasons.some((reason) => reason.startsWith('usage_report_inconclusive:')), true);
+  assert.notEqual(comparison.decision, 'pass');
+  assert.ok(comparison.metrics.astra_own_native_output.candidate > 0);
+  assert.ok(comparison.metrics.task_median_native_output_per_accepted_vs_native != null);
+  const nativeUsage = comparison.cases
+    .find((row) => row.case_id === helperTrial.case_id)
+    .arms['native-codex']
+    .usage.native_output_tokens.value;
+  assert.ok(nativeUsage > 0);
+});
+
+test('importer host-usage-report fixture interoperates with parseTrial and the evaluator', async () => {
+  const packed = await loadQualificationCases();
+  const manifest = recordedManifest(packed.raw);
+  const fixture = JSON.parse(await readFile(path.join(QUAL_FIXTURES, 'host-usage-report-astra.json'), 'utf8'));
+  assert.equal(EVIDENCE_DIGEST_DOMAIN, 'codex-co-engineer.host-usage-evidence.v1');
+  assert.equal(fixture.evidence.digests.trial, hostUsageTrialDigest(fixture.trial));
+  const parsedReport = parseHostUsageReport(fixture);
+  assert.equal(parsedReport.status, 'complete');
+  assert.equal(parsedReport.integrity.ok, true);
+  assert.equal(parsedReport.evidence.trial_digest_verified, true);
+  assert.equal(parsedReport.evidence.digests.trial, fixture.evidence.digests.trial);
+  assert.equal(parsedReport.breakdown.attempts[0].by_model[0].model, ASTRA_MODEL);
+  assert.equal(parsedReport.breakdown.attempts[0].by_model[0].input_tokens, 80);
+  assert.equal(parsedReport.breakdown.attempts[0].output_tokens, 40);
+  const parsedTrial = parseTrial(fixture.trial);
+  assert.equal(parsedTrial.attempts[0].provider, null);
+  assert.equal(parsedTrial.attempts[0].model, null);
+  assert.equal(parsedTrial.attempts[0].usage.provider_output_tokens.value, null);
+  assert.equal(parsedTrial.attempts[0].usage.native_input_tokens.value, 80);
+  assert.equal(parsedTrial.attempts[0].usage.native_output_tokens.value, fixture.trial.attempts[0].usage.native_output_tokens.value);
+  assert.equal(parsedTrial.attempts[0].sequence, 1);
+
+  const trials = cohortTrials(packed.raw, manifest);
+  const target = trials.find((trial) => trial.trial_id === fixture.trial.trial_id);
+  assert.equal(target != null, true);
+  const reports = cohortReports(trials);
+  const index = reports.findIndex((entry) => entry.trial.trial_id === fixture.trial.trial_id);
+  reports[index] = fixture;
+  Object.assign(target, fixture.trial);
+  const comparison = evaluateCohort(packed, manifest, trials, { usageReports: reports });
+  assert.equal(comparison.decision, 'pass');
+  const arm = comparison.cases.find((row) => row.case_id === fixture.trial.case_id).arms[fixture.trial.arm];
+  assert.equal(arm.astra_own_native_output.value, 80);
+  assert.equal(arm.astra_own_native_output.includes_helpers, false);
+  assert.equal(arm.astra_own_native_output.coverage_complete, true);
+});
+
+test('incomplete importer-shaped reports keep observed Astra 40 when primary counters are null', async () => {
+  const packed = await loadQualificationCases();
+  const manifest = recordedManifest(packed.raw);
+  const trials = cohortTrials(packed.raw, manifest);
+  const targetIndex = trials.findIndex((trial) => (
+    trial.arm === 'candidate-3.4.3' && trial.trial_id.endsWith('-r2')
+  ));
+  const targetCase = packed.raw.find((entry) => entry.id === trials[targetIndex].case_id);
+  const helperTrial = makeTrial(trials[targetIndex], targetCase, manifest, {
+    accepted: true,
+    nativeOutput: 40,
+    wall: 1500,
+    failedThenCorrect: false,
+    helper: true,
+  });
+  const { trial, report } = importerShapedIncompleteAstra40(helperTrial);
+  trials[targetIndex] = trial;
+
+  const parsed = parseHostUsageReport(report);
+  assert.equal(parsed.status, 'inconclusive');
+  assert.equal(parsed.integrity.ok, true);
+  assert.equal(parsed.integrity.reasons.some((reason) => reason.startsWith('by_model_sum:')), false);
+  assert.equal(parsed.integrity.reasons.some((reason) => reason.startsWith('native_usage:')), false);
+  assert.equal(parsed.breakdown.attempts[0].output_tokens, null);
+  assert.equal(parsed.breakdown.attempts[0].by_model[0].output_tokens, 40);
+  assert.equal(parsed.breakdown.attempts[0].by_model[0].model, ASTRA_MODEL);
+  const helperRow = parsed.breakdown.attempts.find((row) => row.attempt_id === 'helper');
+  assert.equal(helperRow != null, true);
+  assert.deepEqual(helperRow.by_model, []);
+  assert.equal(helperRow.output_tokens, null);
+
+  const reports = cohortReports(trials);
+  const reportIndex = reports.findIndex((entry) => entry.trial.trial_id === trial.trial_id);
+  reports[reportIndex] = report;
+  const comparison = evaluateCohort(packed, manifest, trials, { usageReports: reports });
+  assert.equal(comparison.decision, 'inconclusive');
+  assert.equal(
+    comparison.reasons.some((reason) => reason === `usage_report_inconclusive:${trial.trial_id}`),
+    true,
+  );
+  assert.equal(
+    comparison.reasons.some((reason) => reason.startsWith(`usage_report_inconsistent:${trial.trial_id}:`)),
+    false,
+  );
+  const arm = comparison.cases
+    .find((row) => row.case_id === trial.case_id)
+    .arms['candidate-3.4.3']
+    .astra_own_native_output;
+  assert.equal(arm.value, 80);
+  assert.equal(arm.coverage_complete, false);
+  assert.equal(arm.trust, 'unknown');
+  assert.equal(comparison.metrics.astra_own_native_output.coverage_complete, false);
+  assert.notEqual(comparison.decision, 'pass');
+
+  const knownMismatch = structuredClone(report);
+  knownMismatch.breakdown.attempts[0].output_tokens = 100;
+  knownMismatch.trial.attempts[0].usage.native_output_tokens = metric(100);
+  knownMismatch.evidence.digests.trial = hostUsageTrialDigest(knownMismatch.trial);
+  const parsedMismatch = parseHostUsageReport(knownMismatch);
+  assert.equal(parsedMismatch.integrity.ok, false);
+  assert.equal(
+    parsedMismatch.integrity.reasons.includes(`by_model_sum:${trial.attempts[0].attempt_id}:output_tokens`),
+    true,
+  );
+
+  const duplicated = structuredClone(report);
+  duplicated.breakdown.attempts[0].by_model.push(modelRow(ASTRA_MODEL, 0, 1));
+  const parsedDuplicate = parseHostUsageReport(duplicated);
+  assert.equal(parsedDuplicate.integrity.ok, false);
+  assert.equal(
+    parsedDuplicate.integrity.reasons.includes(`duplicate_model:${trial.attempts[0].attempt_id}:${ASTRA_MODEL}`),
+    true,
+  );
+});
+
+test('corrupted by_model, mutated trial input, and missing helper rows are inconclusive', async () => {
+  const packed = await loadQualificationCases();
+  const manifest = recordedManifest(packed.raw);
+  const trials = cohortTrials(packed.raw, manifest);
+
+  const clean = evaluateCohort(packed, manifest, trials);
+  assert.equal(clean.decision, 'pass');
+  assert.equal(clean.metrics.astra_own_native_output.coverage_complete, true);
+  const cleanAstra = clean.metrics.astra_own_native_output.candidate;
+
+  const candidateReport = cohortReports(trials).find((entry) => entry.trial.arm === 'candidate-3.4.3');
+  const candidateId = candidateReport.trial.trial_id;
+  const candidateAstra = candidateReport.breakdown.attempts
+    .flatMap((row) => row.by_model)
+    .filter((entry) => entry.model === ASTRA_MODEL)
+    .reduce((sum, entry) => sum + (entry.output_tokens ?? 0), 0);
+
+  const mutatedInputReports = cohortReports(trials);
+  const mutatedInput = mutatedInputReports.find((entry) => entry.trial.trial_id === candidateId);
+  mutatedInput.trial.attempts[0].usage.native_input_tokens.value += 1;
+  const mutatedInputResult = evaluateCohort(packed, manifest, trials, { usageReports: mutatedInputReports });
+  assert.equal(mutatedInputResult.decision, 'inconclusive');
+  assert.equal(
+    mutatedInputResult.reasons.some((reason) => reason === `usage_report_mismatch:${candidateId}:canonical_trial`),
+    true,
+  );
+  assert.equal(mutatedInputResult.metrics.astra_own_native_output.coverage_complete, false);
+  assert.notEqual(mutatedInputResult.decision, 'pass');
+
+  const modelReports = cohortReports(trials);
+  const modelReport = modelReports.find((entry) => entry.trial.trial_id === candidateId);
+  const astraRow = modelReport.breakdown.attempts[0].by_model.find((entry) => entry.model === ASTRA_MODEL);
+  const originalAstra = astraRow.output_tokens;
+  astraRow.output_tokens = 1;
+  const modelResult = evaluateCohort(packed, manifest, trials, { usageReports: modelReports });
+  assert.equal(modelResult.decision, 'inconclusive');
+  assert.equal(
+    modelResult.reasons.some((reason) => reason.startsWith(`usage_report_inconsistent:${candidateId}:`)),
+    true,
+  );
+  assert.equal(modelResult.metrics.astra_own_native_output.coverage_complete, false);
+  assert.notEqual(modelResult.metrics.astra_own_native_output.candidate, cleanAstra - originalAstra + 1);
+  assert.notEqual(modelResult.metrics.astra_own_native_output.candidate, cleanAstra - candidateAstra + 1);
+  assert.notEqual(modelResult.decision, 'pass');
+
+  const helperTrials = cohortTrials(packed.raw, manifest);
+  const helperIndex = helperTrials.findIndex((trial) => trial.arm === 'candidate-3.4.3');
+  const helperCase = packed.raw.find((entry) => entry.id === helperTrials[helperIndex].case_id);
+  helperTrials[helperIndex] = makeTrial(helperTrials[helperIndex], helperCase, manifest, {
+    accepted: true,
+    nativeOutput: 40,
+    wall: 1500,
+    failedThenCorrect: false,
+    helper: true,
+  });
+  const helperReports = cohortReports(helperTrials);
+  const helperId = helperTrials[helperIndex].trial_id;
+  const helperReport = helperReports.find((entry) => entry.trial.trial_id === helperId);
+  helperReport.breakdown.attempts.pop();
+  const helperResult = evaluateCohort(packed, manifest, helperTrials, { usageReports: helperReports });
+  assert.equal(helperResult.decision, 'inconclusive');
+  assert.equal(
+    helperResult.reasons.some((reason) => reason === `usage_report_inconsistent:${helperId}:missing_attempt:helper`),
+    true,
+  );
+  const helperArm = helperResult.cases
+    .find((row) => row.case_id === helperTrials[helperIndex].case_id)
+    .arms['candidate-3.4.3']
+    .astra_own_native_output;
+  assert.equal(helperResult.metrics.astra_own_native_output.coverage_complete, false);
+  assert.equal(helperArm.coverage_complete, false);
+  assert.ok(helperArm.value > 0);
+  assert.ok(helperResult.metrics.astra_own_native_output.candidate > 0);
+  assert.notEqual(helperResult.decision, 'pass');
+});
+
+test('deadline over one hour fails when identities are otherwise comparable', async () => {
+  const packed = await loadQualificationCases();
+  const manifest = recordedManifest(packed.raw);
+  const trials = cohortTrials(packed.raw, manifest, {
+    'candidate-3.4.3': { wall: 3_600_001, failedThenCorrect: false },
+  });
+  const comparison = evaluateCohort(packed, manifest, trials);
+  assert.equal(comparison.decision, 'fail');
+  assert.equal(comparison.reasons.some((reason) => reason.startsWith('deadline_exceeded:')), true);
+});
diff --git a/scripts/validate-package-docs.mjs b/scripts/validate-package-docs.mjs
index dc0f480..9f30038 100644
--- a/scripts/validate-package-docs.mjs
+++ b/scripts/validate-package-docs.mjs
@@ -16,10 +16,12 @@ export const PACKAGE_DOCUMENTS = Object.freeze([
   ['docs/configuration.md', 'configuration.md'],
   ['docs/mcp-pending-call.md', 'mcp-pending-call.md'],
   ['docs/run-tool-api.md', 'run-tool-api.md'],
+  ['docs/run-results.md', 'run-results.md'],
   ['docs/efficient-dogfood.md', 'efficient-dogfood.md'],
   ['docs/releases/v3.3.0.md', 'releases/v3.3.0.md'],
   ['docs/releases/v3.4.1.md', 'releases/v3.4.1.md'],
   ['docs/releases/v3.4.2.md', 'releases/v3.4.2.md'],
+  ['docs/releases/v3.4.3.md', 'releases/v3.4.3.md'],
 ].map(([source, packageRelative]) => Object.freeze({ source, packageRelative })));
 
 export const PACKAGE_DOC_ROOT = 'plugins/codex-co-engineer/docs';
diff --git a/scripts/validate-release.mjs b/scripts/validate-release.mjs
index 5c92df9..fff5e8a 100755
--- a/scripts/validate-release.mjs
+++ b/scripts/validate-release.mjs
@@ -15,7 +15,7 @@ import { validatePackageDocs } from './validate-package-docs.mjs';
 
 const ROOT = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..');
 const PLUGIN = 'plugins/codex-co-engineer';
-const RELEASE_VERSION = '3.4.2';
+const RELEASE_VERSION = '3.4.3';
 
 function fail(message) { throw new Error(message); }
 const absolute = (relative) => path.join(ROOT, relative);
@@ -49,6 +49,7 @@ const required = [
   'docs/threat-model.md', 'docs/releases/v3.1.0.md',
   'docs/releases/v3.1.1.md', 'docs/releases/v3.2.0.md', 'docs/releases/v3.2.1.md',
   'docs/releases/v3.3.0.md', 'docs/releases/v3.4.0.md', 'docs/releases/v3.4.1.md', 'docs/releases/v3.4.2.md',
+  'docs/releases/v3.4.3.md',
   'docs/assets/codex-co-engineer-3.1.0.svg', 'docs/assets/codex-co-engineer-3.1.0.jpg',
   '.agents/plugins/marketplace.json', 'scripts/mcp-pending-call-probe.mjs',
   '.codex/release-gate.toml', '.github/workflows/ci.yml',
diff --git a/tools/acpx-vendor/src/hardening-overlay.mjs b/tools/acpx-vendor/src/hardening-overlay.mjs
index b9755ae..4c58a87 100644
--- a/tools/acpx-vendor/src/hardening-overlay.mjs
+++ b/tools/acpx-vendor/src/hardening-overlay.mjs
@@ -467,3 +467,133 @@ AcpClient.prototype.killAgentIfRunning = async function coEngineerKillAgentIfRun
   }
   return coEngineerWaitForAgentTree(child, waitMs);
 };
+
+/*
+ * Turn deadlines must stay extensible. Upstream runPromptTurn races the prompt
+ * against a fixed withTimeout; when that timer fires after any agent reply it
+ * fabricates {stopReason:'end_turn',source:'session'}, which the manager
+ * records as a completed turn. Co-Engineer therefore:
+ *   1. races the prompt against the turn AbortSignal (worker-owned deadline)
+ *   2. never promotes TimeoutError / interrupt into a synthetic end_turn
+ * Session startup and bounded cleanup keep using their own withTimeout paths.
+ *
+ * The turn signal is propagated with AsyncLocalStorage so overlapping turns
+ * (and managers) cannot overwrite each other's AbortSignal across awaits.
+ * A module-global would race: turn B could steal turn A's signal, or A's
+ * finally could restore a stale value while B is still awaiting.
+ */
+const { AsyncLocalStorage: CoEngineerAsyncLocalStorage } = process.getBuiltinModule('node:async_hooks');
+const coEngineerTurnSignalStore = new CoEngineerAsyncLocalStorage();
+
+/*
+ * Upstream settles turn.result before finalizeRuntimeTurn retains (or closes)
+ * the persistent client. Callers that await result then close() race an empty
+ * pendingPersistentClients map, so close returns without terminating the ACP
+ * agent or its detached descendants. Defer settlement until after the upstream
+ * turn task — including finalize — completes so retention precedes result.
+ */
+const coEngineerOriginalRunRuntimeTurnTask = AcpRuntimeManager.prototype.runRuntimeTurnTask;
+AcpRuntimeManager.prototype.runRuntimeTurnTask = function coEngineerRunRuntimeTurnTask(task) {
+  const originalSettleResult = task.settleResult;
+  let deferredSettlement;
+  task.settleResult = (next) => {
+    if (deferredSettlement === undefined) deferredSettlement = next;
+  };
+  return coEngineerTurnSignalStore.run(task?.input?.signal ?? null, async () => {
+    try {
+      await coEngineerOriginalRunRuntimeTurnTask.call(this, task);
+    } finally {
+      if (deferredSettlement !== undefined) originalSettleResult(deferredSettlement);
+    }
+  });
+};
+
+/*
+ * finalizeRuntimeTurnRecord samples refreshClosedState, then awaits
+ * sessionStore.save before retainPersistentClientAfterTurn. close() can finish
+ * in that gap: it persists closed=true on a freshly loaded record, but
+ * finalization still holds a stale not-closed decision, overwrites the stored
+ * snapshot, and retains the live client. Refuse retain after close intent
+ * (closingActiveRecords / closed) and re-persist the closed snapshot after
+ * that save.
+ */
+const coEngineerOriginalRetainPersistentClientAfterTurn = AcpRuntimeManager.prototype.retainPersistentClientAfterTurn;
+AcpRuntimeManager.prototype.retainPersistentClientAfterTurn = async function coEngineerRetainPersistentClientAfterTurn(input) {
+  if (input.record.closed || this.closingActiveRecords.has(input.record.acpxRecordId)) return false;
+  return coEngineerOriginalRetainPersistentClientAfterTurn.call(this, input);
+};
+
+const coEngineerOriginalFinalizeRuntimeTurnRecord = AcpRuntimeManager.prototype.finalizeRuntimeTurnRecord;
+AcpRuntimeManager.prototype.finalizeRuntimeTurnRecord = async function coEngineerFinalizeRuntimeTurnRecord(turn) {
+  const retained = await coEngineerOriginalFinalizeRuntimeTurnRecord.call(this, turn);
+  const closed = await this.refreshClosedState(turn.record);
+  if (!closed) return retained;
+  if (retained) await this.closePendingPersistentClient(turn.record.acpxRecordId);
+  await this.options.sessionStore.save(turn.record).catch(() => {});
+  return false;
+};
+
+async function coEngineerAwaitPromptWithDeadline(promise, { timeoutMs, signal } = {}) {
+  const hasTimeout = timeoutMs != null && timeoutMs > 0;
+  const hasSignal = signal != null;
+  if (!hasTimeout && !hasSignal) return await promise;
+  return await new Promise((resolve, reject) => {
+    let settled = false;
+    let timer;
+    let abortTimer;
+    const cleanup = () => {
+      if (timer) clearTimeout(timer);
+      if (abortTimer) clearTimeout(abortTimer);
+      if (hasSignal) signal.removeEventListener('abort', onAbort);
+    };
+    const finish = (callback, value) => {
+      if (settled) return;
+      settled = true;
+      cleanup();
+      callback(value);
+    };
+    const onAbort = () => {
+      // Let session/cancel settle cooperatively before forcing a turn failure.
+      // Hostile agents that ignore cancel still fail after this short grace.
+      abortTimer = setTimeout(() => finish(reject, new InterruptedError()), 200);
+    };
+    // Observe the prompt before any early abort path so a pre-aborted signal
+    // or hostile late settlement cannot become an unhandled rejection.
+    promise.then(
+      (value) => finish(resolve, value),
+      (error) => finish(reject, error),
+    );
+    if (signal?.aborted) {
+      finish(reject, new InterruptedError());
+      return;
+    }
+    if (hasSignal) signal.addEventListener('abort', onAbort, { once: true });
+    if (hasTimeout) {
+      timer = setTimeout(() => finish(reject, new TimeoutError(timeoutMs)), timeoutMs);
+    }
+  });
+}
+
+runPromptTurn = async function coEngineerRunPromptTurn(params) {
+  const promptPromise = params.client.prompt(params.sessionId, params.prompt);
+  try {
+    await params.onPromptStarted?.();
+    const response = await coEngineerAwaitPromptWithDeadline(promptPromise, {
+      timeoutMs: params.timeoutMs,
+      signal: params.signal ?? coEngineerTurnSignalStore.getStore(),
+    });
+    await params.client.waitForSessionUpdatesIdle?.({
+      idleMs: SESSION_REPLY_IDLE_MS,
+      timeoutMs: SESSION_REPLY_DRAIN_TIMEOUT_MS,
+    }).catch(() => {});
+    recordPromptResponseUsage(params.conversation, response.usage, params.promptMessageId);
+    return { stopReason: response.stopReason, source: 'rpc' };
+  } catch (error) {
+    // Absorb late prompt settlement after interrupt/timeout; never replay.
+    void promptPromise.then(() => {}, () => {});
+    if (error instanceof InterruptedError) {
+      return { stopReason: 'cancelled', source: 'signal' };
+    }
+    throw error;
+  }
+};