fix(query): expose ordinary execution evidence

[DecisionNerd]

Summary

• finalize the existing demand snapshot for ordinary streaming sinks at EOS, error, or abandonment
• emit a versioned, sanitized graphforge-result-sink/2 receipt through ordinary gf --json query with deterministic query work, bounded identity, TopK/spill, memory/RSS release, logical result fingerprint, and exact optional count scalar
• prove destination-only one/two-hop execution, reusable bounded identity, deterministic results, and released memory directly through the Rust API

Validation

• cargo test -p graphforge-api --test fixed_hop_limit ordinary_streaming_sink_exposes_deterministic_query_evidence
• cargo clippy -p graphforge-exec -p graphforge-api -p graphforge-cli --lib --bins -- -D warnings
• python3 scripts/ci/test-non-cypher-surface-gate.py (12/12)
• uv run python crates/graphforge-bindings-py/tests/non_cypher_release.py --classification-only
• python3 scripts/ci/check-binding-parity-policy.py

Full cargo clippy ... --tests -- -D warnings also exercised the changed targets but is currently blocked by pre-existing unrelated test-target lints; no ignores or assertion weakening were added. Node runtime parity could not start in the fresh worktree because apache-arrow is not installed; the repository policy validator passed and CI remains authoritative.

Refs #966. Supports #904 and #956. Both #966 and #904 remain open for real provider qualification; this PR intentionally contains no closing reference.

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Summary by CodeRabbit

• New Features

  • Added query execution evidence for streaming results, including hop, sorting, memory, and sink details.
  • Added deterministic result fingerprints and optional scalar result reporting.
  • Added a unified evidence-enabled execution flow for Parquet and Arrow IPC outputs.

• Improvements

  • CLI JSON output now uses the graphforge-result-sink/2 contract and includes result evidence.
  • Query execution now records completion and resource-usage information across successful, failed, or interrupted runs.

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Walkthrough

The change adds query execution evidence for streaming result sinks. It captures execution metrics, hashes Parquet and Arrow IPC results, extracts scalar values, exposes a new GraphForge API, updates CLI output, and extends surface-contract tests.

Changes

Query execution evidence

Layer / File(s)	Summary
Execution stream evidence capture crates/graphforge-exec/src/lib.rs	execute_plan_stream now wraps execution in QueryEvidenceStream, which records memory and batch metrics and finalizes evidence on completion, error, or drop.
Evidence contracts and result inspection crates/graphforge-api/src/query_evidence.rs, crates/graphforge-api/src/lib.rs	The API adds serializable evidence types, Parquet and Arrow IPC inspection, SHA-256 result hashing, scalar extraction, demand-snapshot conversion, and GraphForge::execute_to_result_sink_with_evidence.
CLI result contract integration crates/graphforge-cli/src/portable_cli.rs	The CLI uses the unified sink API for both output formats and emits result hashes, scalar values, query evidence, and the version 2 sink contract.
Evidence validation and public-surface updates crates/graphforge-api/tests/fixed_hop_limit.rs, crates/graphforge-bindings-node/tests/non-cypher-parity-policy.json, crates/graphforge-bindings-py/tests/non_cypher_release.py, scripts/ci/test-non-cypher-surface-gate.py, tests/contracts/non-cypher-rust-surface.json	Tests validate deterministic evidence, bounded reader behavior, and scalar receipts. Public-surface counts, digests, parity data, and method inventories include the new API.

Estimated code review effort: 4 (Complex) | ~45 minutes

Merge Risk: 🟡 Moderate · up to 8c6be

The change adds query-evidence receipts, but the current implementation hashes re-encoded logical data rather than the published artifact despite the documented result_sha256 contract, so consumers may be unable to verify stored outputs. The Node parity mapping also omits the supported Arrow IPC sink. Merge should wait for the hash contract fix or explicit resolution and the parity mapping update.

Sequence Diagram(s)

sequenceDiagram
  participant CLI
  participant GraphForge
  participant QueryEvidenceStream
  participant ResultSink
  CLI->>GraphForge: execute_to_result_sink_with_evidence
  GraphForge->>QueryEvidenceStream: execute plan and capture metrics
  QueryEvidenceStream->>ResultSink: publish Parquet or Arrow IPC result
  ResultSink-->>GraphForge: sink receipt
  GraphForge->>ResultSink: inspect published artifact
  ResultSink-->>GraphForge: SHA-256 and optional scalar
  GraphForge-->>CLI: sink metadata and query evidence

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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 27.78% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 18 functions across 6 files. (3 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: exposing ordinary query execution evidence.
Description check	✅ Passed	The description clearly explains the implementation, expected behavior, related issues, validation commands, known test limitations, and intended scope. It omits several template checklists and admini…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

The description clearly explains the implementation, expected behavior, related issues, validation commands, known test limitations, and intended scope. It omits several template checklists and administrative sections, but the core technical information is complete.

Full details: Docstring Coverage

Explanation

Docstring coverage is 27.78% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 18 functions across 6 files. (3 skipped: 2 unsupported, 1 too large.)

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Actionable comments posted: 2

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Inline comments:
In `@crates/graphforge-api/src/query_evidence.rs`:
- Around line 178-185: Update published_result_metadata to compute result_sha256
from the bytes of the published artifact at sink.destination, rather than
re-encoding logical_batch with StreamWriter; preserve the SHA-256-of-artifact
contract for Parquet output and remove the alternate logical encoding path.

In `@crates/graphforge-bindings-node/tests/non-cypher-parity-policy.json`:
- Around line 264-266: Add PlanHandle.sinkArrowIpc to the nodeMembers mapping
alongside PlanHandle.sinkParquet so both supported result-sink formats are
covered by the parity record.

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📥 Commits

Reviewing files that changed from the base of the PR and between 3400623 and 8c6be85.

⛔ Files ignored due to path filters (1)

• docs/book/architecture/execution-model.md is excluded by !**/*.md, !**/docs/**

📒 Files selected for processing (9)

• crates/graphforge-api/src/lib.rs
• crates/graphforge-api/src/query_evidence.rs
• crates/graphforge-api/tests/fixed_hop_limit.rs
• crates/graphforge-bindings-node/tests/non-cypher-parity-policy.json
• crates/graphforge-bindings-py/tests/non_cypher_release.py
• crates/graphforge-cli/src/portable_cli.rs
• crates/graphforge-exec/src/lib.rs
• scripts/ci/test-non-cypher-surface-gate.py
• tests/contracts/non-cypher-rust-surface.json

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