diff --git a/.github/actions/setup/action.yml b/.github/actions/setup/action.yml
new file mode 100644
index 0000000..ce21c6e
--- /dev/null
+++ b/.github/actions/setup/action.yml
@@ -0,0 +1,16 @@
+name: Set up workspace
+description: pnpm through corepack (the packageManager field), Node from .nvmrc, a pnpm store cache and a frozen install.
+runs:
+  using: composite
+  steps:
+    # Corepack reads the exact pnpm version from package.json's packageManager field.
+    - name: Enable corepack
+      shell: bash
+      run: corepack enable
+    - uses: actions/setup-node@v4
+      with:
+        node-version-file: .nvmrc
+        cache: pnpm
+    - name: Install dependencies
+      shell: bash
+      run: pnpm install --frozen-lockfile
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9511d2f..38f68f4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,70 +1,80 @@
 name: CI
 
+# Quality gates. A draft runs nothing; a pull request that is ready for review runs every gate on each push.
+# Results are summarised in one comment on the pull request (no external services involved).
 on:
   pull_request:
     branches:
       - master
       - feature/quality-gates-twig-parity-audit
+    types: [opened, synchronize, reopened, ready_for_review, converted_to_draft]
   push:
     branches:
       - feature/quality-gates-twig-parity-audit
 
+# A draft run skips every job, so it gets its own group: sharing one with the real run could cancel the
+# ready_for_review run.
+concurrency:
+  group: quality-gates-${{ github.event.pull_request.number || github.ref }}${{ github.event.pull_request.draft && '-draft' || '' }}
+  cancel-in-progress: true
+
 permissions:
   contents: read
 
-concurrency:
-  group: ci-${{ github.ref }}
-  cancel-in-progress: true
+defaults:
+  run:
+    shell: bash
 
 jobs:
-  gates:
-    name: Quality gates
+  static:
+    name: Lint & Static Checks
+    if: github.event_name != 'pull_request' || github.event.pull_request.draft == false
     runs-on: ubuntu-latest
-    timeout-minutes: 20
+    timeout-minutes: 15
+    env:
+      NODE_OPTIONS: --max-old-space-size=6144
     steps:
       - name: Checkout
         uses: actions/checkout@v4
-
-      # pnpm must be installed before setup-node so its store cache can resolve.
-      # No `version` input: it is read from the packageManager field.
-      - name: Set up pnpm
-        uses: pnpm/action-setup@v4
-
-      - name: Set up Node
-        uses: actions/setup-node@v4
-        with:
-          node-version-file: .nvmrc
-          cache: pnpm
-
-      - name: Print versions
-        run: |
-          node -v
-          pnpm -v
-
-      - name: Install dependencies
-        run: pnpm install --frozen-lockfile
-
-      - name: Build
-        run: pnpm build
-
-      - name: Typecheck
-        run: pnpm typecheck
-
+      - name: Set up pnpm and Node
+        uses: ./.github/actions/setup
       - name: Lint
         run: pnpm lint
-
       - name: Format check
         run: pnpm format:check
-
-      - name: Test with coverage
-        run: pnpm test:coverage
-
       - name: Check manifest
         run: pnpm check:manifest
-
       - name: Dead code (knip)
         run: pnpm knip
 
+  unit:
+    name: Unit Tests & Coverage
+    if: github.event_name != 'pull_request' || github.event.pull_request.draft == false
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up pnpm and Node
+        uses: ./.github/actions/setup
+      - name: Run unit tests and enforce the coverage floor
+        run: pnpm test:coverage
+      - name: Write the coverage report
+        if: always()
+        run: |
+          mkdir -p report
+          {
+            echo "### Unit tests and coverage"
+            if [ -f coverage/coverage-summary.json ]; then
+              echo
+              echo "| Metric | Covered | Total | % |"
+              echo "| --- | --- | --- | --- |"
+              jq -r '.total | to_entries[] | select(.key | IN("lines","statements","functions","branches")) | "| \(.key) | \(.value.covered) | \(.value.total) | \(.value.pct) |"' coverage/coverage-summary.json
+            else
+              echo
+              echo "No coverage summary was produced."
+            fi
+          } > report/coverage.md
       - name: Upload coverage report
         if: always()
         uses: actions/upload-artifact@v4
@@ -73,3 +83,119 @@ jobs:
           path: coverage/
           if-no-files-found: warn
           retention-days: 7
+      - name: Upload the report section
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: report-coverage
+          path: report/coverage.md
+          retention-days: 1
+
+  build:
+    name: Build, Types & Bundle Size
+    if: github.event_name != 'pull_request' || github.event.pull_request.draft == false
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up pnpm and Node
+        uses: ./.github/actions/setup
+      - name: Build
+        run: pnpm build
+      # Typecheck needs app/routeTree.gen.ts, which the build generates on a clean checkout.
+      - name: Typecheck
+        run: pnpm typecheck
+      - name: Write the bundle size report
+        if: always()
+        run: |
+          mkdir -p report
+          {
+            echo "### Bundle size"
+            if [ -d dist ]; then
+              echo
+              echo "Total build output: $(du -sh dist | cut -f1)"
+              echo
+              echo "Largest JS and CSS files:"
+              echo
+              echo '```'
+              find dist -type f \( -name '*.js' -o -name '*.css' \) -printf '%s %p\n' | sort -rn | head -15 | awk '{printf "%8.1f KB  %s\n", $1/1024, $2}'
+              echo '```'
+            else
+              echo
+              echo "The build produced no output."
+            fi
+          } > report/size.md
+      - name: Upload the report section
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: report-size
+          path: report/size.md
+          retention-days: 1
+
+  # One verdict over every gate above: the single check to require in a branch ruleset.
+  testing-result:
+    name: Testing Ready
+    needs: [static, unit, build]
+    if: always() && (github.event_name != 'pull_request' || github.event.pull_request.draft == false)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Every gate passed
+        env:
+          NEEDS: ${{ toJSON(needs) }}
+        run: |
+          echo "$NEEDS" | jq -r 'to_entries[] | "\(.key): \(.value.result)"'
+          echo "$NEEDS" | jq -e 'all(.[]; .result == "success")' > /dev/null
+
+  # Not part of Testing Ready: a comment problem never blocks a merge.
+  reports:
+    name: Test Reports
+    needs: [static, unit, build]
+    if: always() && github.event_name == 'pull_request' && github.event.pull_request.draft == false
+    # The organization's API IP allow list rejects calls from GitHub-hosted runners, so the comment is posted from the
+    # organization runner when the RUNS_ON variable is set (a JSON runner label or group), else from ubuntu-latest.
+    runs-on: ${{ vars.RUNS_ON && fromJson(vars.RUNS_ON) || 'ubuntu-latest' }}
+    timeout-minutes: 10
+    continue-on-error: true
+    concurrency:
+      group: test-reports-${{ github.event.pull_request.number }}
+      cancel-in-progress: false
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - name: Download the report sections
+        uses: actions/download-artifact@v4
+        with:
+          path: report
+          pattern: report-*
+          merge-multiple: true
+        continue-on-error: true
+      - name: Comment on the pull request
+        # The report is always in the job summary too, so a comment the API refuses does not fail the run.
+        continue-on-error: true
+        env:
+          GH_TOKEN: ${{ github.token }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          NEEDS: ${{ toJSON(needs) }}
+        run: |
+          marker='<!-- ci-test-report -->'
+          {
+            echo "$marker"
+            echo "## Test report"
+            echo
+            echo "| Gate | Result |"
+            echo "| --- | --- |"
+            echo "$NEEDS" | jq -r 'to_entries[] | "| \(.key) | \(.value.result) |"'
+            for f in report/coverage.md report/size.md; do
+              if [ -f "$f" ]; then echo; cat "$f"; fi
+            done
+          } > comment.md
+          cat comment.md >> "$GITHUB_STEP_SUMMARY"
+          existing="$(gh api "repos/$GITHUB_REPOSITORY/issues/$PR_NUMBER/comments" --paginate --jq ".[] | select(.body | contains(\"$marker\")) | .id" | head -n 1)"
+          if [ -n "$existing" ]; then
+            gh api --method PATCH "repos/$GITHUB_REPOSITORY/issues/comments/$existing" -F body=@comment.md
+          else
+            gh api --method POST "repos/$GITHUB_REPOSITORY/issues/$PR_NUMBER/comments" -F body=@comment.md
+          fi
diff --git a/docs/ci.md b/docs/ci.md
new file mode 100644
index 0000000..7a01a84
--- /dev/null
+++ b/docs/ci.md
@@ -0,0 +1,14 @@
+# CI quality gates
+
+`.github/workflows/ci.yml` runs on every pull request that is ready for review (and on pushes to the base branch).
+It uses only public actions and has no dependency on private repositories, organization variables or external services.
+
+| Job                          | What it does                                                              |
+| ---------------------------- | ------------------------------------------------------------------------- |
+| `Lint & Static Checks`       | lint, format check, manifest check, dead code (knip)                      |
+| `Unit Tests & Coverage`      | `pnpm test:coverage`, which enforces the coverage floor                   |
+| `Build, Types & Bundle Size` | build, typecheck (needs the generated route tree), bundle size            |
+| `Testing Ready`              | one verdict over the three jobs above: the check to require               |
+| `Test Reports`               | posts one summary comment on the pull request and updates it on each push |
+
+The `Test Reports` job posts with the workflow token (`pull-requests: write`, no extra credentials) and also writes the report to the job summary. The organization restricts API calls by IP, so it runs on the `RUNS_ON` runner when that variable is set. Reports are plain text in that comment, with no links. The coverage HTML is kept as the `coverage` workflow artifact for 7 days.
diff --git a/vitest.config.ts b/vitest.config.ts
index 27bd3f7..da7753a 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -30,7 +30,7 @@ export default defineConfig({
     },
     coverage: {
       provider: 'v8',
-      reporter: ['text', 'json', 'html', 'lcov'],
+      reporter: ['text', 'json', 'json-summary', 'html', 'lcov'],
       include: ['app/**/*.{ts,tsx}'],
       exclude: ['app/**/*.d.ts'],
       // Coverage floor (ratchet): measured on app/** and rounded down. It only goes up —