chore(aiwg): adopt shared BT6 maintainer workflow (#148)

* docs(policy): allow low-impact contributor courtesy cleanup

* chore(aiwg): migrate to shared BT6 maintainer plugin

* chore: reconcile delivery validation

.aiwg/requirements/UC-005.md

@@ -1,13 +1,81 @@
 # UC-005 — Reproduce Claims and Benchmark Results
 
-**Primary actor:** Maintainer, contributor, or evaluator  
-**Goal:** Re-derive public capability claims from committed data and detect fitting or provenance regressions.
+## Metadata
 
-## Main Flow
+- **ID:** UC-005
+- **Status:** Baselined (brownfield)
+- **Level:** User goal
+- **Scope:** Benchmark corpora, manifests, ground truth, receipts, graders, claim verification, and CI
+- **Primary actor:** Maintainer, contributor, or evaluator
+- **Goal:** Re-derive public capability claims from versioned evidence and detect grading, provenance, or fitting regressions.
+- **Related stories:** US-08, US-09, US-10
+- **Quality drivers:** NFR-03, NFR-08, NFR-09
 
-1. Evaluator runs claim or benchmark verification.
-2. Harness reads committed corpus, receipts, and ground truth.
-3. Scores and verdicts are recomputed.
-4. CI fails if claims, provenance, or anti-fitting invariants do not hold.
+## Preconditions
 
-**Implementation coverage:** `bench/`, `scripts/verify-claims.mjs`, model/benchmark scripts, anti-fitting tests, `.github/workflows/ci.yml`.
+- The evaluated corpus, manifest, ground truth, and required receipts are available under their documented retention policy.
+- The evaluator uses the declared harness, metric, model/configuration identity, and command.
+- Sensitive or third-party material is handled according to repository policy.
+
+## Trigger
+
+The evaluator runs claim verification, a benchmark verifier, or the corresponding CI gate.
+
+## Main Success Scenario
+
+1. The harness loads the versioned corpus/manifest and ground truth.
+2. It validates required receipt identity and provenance fields.
+3. The grader recomputes per-case outcomes from retained evidence.
+4. Aggregate scores and headline verdicts are recomputed using the declared metric.
+5. Anti-fitting checks verify separation and policy invariants.
+6. The verifier compares derived values with public claims.
+7. It emits a pass/fail result and enough context to reproduce a mismatch.
+8. CI blocks integration when a required claim, provenance, or anti-fitting invariant fails.
+
+## Alternate Flows
+
+- A local evaluator runs only deterministic verification against committed artifacts.
+- A live benchmark run produces new receipts, followed by deterministic grading in a separate step.
+- Raw sensitive transcripts may be withheld while a declared, re-derivable graded receipt remains available; the documentation must state the reproduction boundary.
+
+## Exception Flows
+
+- Missing or stale evidence: fail the affected claim rather than substituting an estimate.
+- Model/provider outage during a live run: classify as infrastructure/run failure, not model success or failure.
+- Ground-truth or manifest mismatch: stop grading and identify the conflicting artifact.
+- Suspected self-fitting or corpus leakage: fail the anti-fitting gate pending review.
+
+## Postconditions
+
+- Every passing headline claim maps to the evaluated corpus, metric, and retained evidence.
+- Failed claims identify the discrepant artifact or value.
+- Benchmark scope is not generalized to unsupported product maturity.
+
+## Acceptance Criteria
+
+- [ ] `npm run verify-claims` derives required public claims from repository artifacts.
+- [ ] Seeded claim mismatches, missing provenance, or fitting violations cause a non-zero gate result.
+- [ ] Receipts identify the relevant corpus/model/configuration and evaluation outcome.
+- [ ] Live-run infrastructure failures remain distinct from evaluated model verdicts.
+- [ ] Maturity documentation limits conclusions to the evaluated scope.
+
+## Design and Test Traceability
+
+| Concern | Implementation | Verification |
+| --- | --- | --- |
+| Claim derivation | `scripts/verify-claims.mjs`, benchmark manifests/receipts | Claim verification in CI |
+| Finding grading | Verification/refutation and grading scripts | Script self-tests and benchmark tests |
+| Anti-fitting | No-fitting and no-self-fitting checks | Seeded anti-fitting tests |
+| Gate enforcement | `.github/workflows/ci.yml` | CI job status and local command parity |
+
+## References
+
+- @.aiwg/architecture/adr-004.md — Evidence-derived public-claims decision.
+- @.aiwg/architecture/adr-005.md — Current-state versus research-vision decision.
+- @.aiwg/architecture/vision-alignment.md — Maturity interpretation rules.
+- @scripts/verify-claims.mjs — Deterministic public-claim verifier.
+- @scripts/verify-finding.mjs — Finding verification.
+- @scripts/refute-finding.mjs — Candidate-refutation path.
+- @scripts/test-no-fitting.mjs — Anti-fitting evidence.
+- @scripts/test-no-self-fitting.mjs — Self-fitting prevention evidence.
+- @.github/workflows/ci.yml — Required automated gates.