fix(projects): require second-review policy false

[Abiorh001]

The current ReviewPolicy accepts and stores requires_second_review=true even though Workstream has no second-review or adjudication lifecycle. This change makes false the only supported typed and persisted value while preserving the exact canonical hashes of existing false policies.

PR #487 is merged. This branch now includes current main at 235f9e1b as an integration parent; migration 0024 directly extends the merged 0023 head without changing its payment-cleanup behavior. The exact reviewable head is 08bb029d4167f74f418e0216dbbd23673ee579d9. Part of #498; this bounded PR does not complete or close the broader planning issue.

Changes:

• use Literal[False] = False for review-policy input and immutable lineage/response contracts;
• add migration 0024 after 0023, taking an ACCESS EXCLUSIVE lock, refusing retained true rows with SQLSTATE 23514, and installing a PostgreSQL check without rewriting, deleting, or rehashing policy facts;
• cover public 422 behavior, raw SQL enforcement, shared locked-policy projection, fixed v1/v2 hash bytes, real retained-true refusal, false-only upgrade preservation, the Alembic graph, and semantic lane ownership;
• update current review-policy documentation and roadmap claims without adding second-review, adjudication, ContributionPolicy, award, payment, routing, or activation behavior.

Validation on exact head 08bb029d:

• PostgreSQL 16 real 0023 predecessor tests: 2 passed, covering retained-true refusal with unchanged row/hash/guide selector/version and false-only upgrade with unchanged rows/hashes/selectors plus the named 0024 constraint.
• PostgreSQL 16 public/raw boundary tests: 2 passed; public true input returns 422 without advancing the selected policy, and raw SQL true insertion fails at the database constraint.
• The payment-cleanup full-head migration consumer passed with the canonical current revision; the previously incomplete worker-authority test passed separately in 99.41 seconds.
• 36 focused immutable-lineage, fixed-hash, shared locked-policy and Alembic graph cases passed; the lane catalogue passed 42 tests; Ruff passed for all changed Python files.
• Commitrail, changed Markdown links, stale Workstream wording, stale review contracts and diff checks passed.
• Every isolated PostgreSQL run recorded Alembic head 0024 and verified its disposable database and role cleanup.
• Independent architecture, security, QA, documentation, reuse and test-delta review found no remaining material issue on this exact source tree.

A historical hosted run on the earlier source candidate used tested merge 03e508e2 and completed 8,718 unique tests with no skips or deselections across all nine backend lanes. That is historical evidence, not current-head CI. A later dcbae842 run reached its 20-minute task_lifecycle_c deadline after 499 of 500 tests; it recorded no assertion failure, and its sole incomplete worker-authority node now passes in the focused exact-head replay above. Fresh hosted Backend run 37759970509 passed all nine lanes and the aggregate on the first attempt at exact head 08bb029d; tested merge 59684d03 has tree c1e36b41, matching the source head exactly. Its retained artifacts record 8,733 unique completed tests with no skips or deselections, PostgreSQL head 0024, and successful database/MinIO cleanup. Exact-head Agent Gates and MCP Foundation also passed. The independent canonical validator passed (test lane evidence valid) against tested merge 59684d03; its tree c1e36b41 matches exact source head 08bb029d, with all 8,733 unique tests complete, no skips or deselections, and all nine cleanup records verified.

Roadmap impact is limited to the supported ReviewPolicy setting and the review-decision/revision scoreboard row. Automated acceptance, human review/revision, and adjudication availability are unchanged.

Summary by CodeRabbit

• Behavior Changes
  • Review policies only accept and store false for the second-review setting. Attempts to submit or store true are rejected.
  • Database upgrades are blocked if existing policies have the setting enabled; those policies are not rewritten or deleted.
  • Existing policies with the supported false value retain their hashes and behavior.

[coderabbitai]

📝 Walkthrough

Walkthrough

The change restricts requires_second_review to false in typed policy contracts and database storage. Migration 0024 refuses to proceed when retained policies contain true; otherwise, it adds a check constraint. Tests cover validation, migration behavior, and preserved policy state.

Changes

False-only ReviewPolicy

Layer / File(s)	Summary
False-only policy boundaries backend/app/modules/projects/..., backend/tests/projects/review_policy/*, backend/tests/projects/test_locked_policy_contract.py, backend/scripts/external_api_drill.py, README.md, docs/architecture_lockdown.md, docs/architecture_system_architecture.md, docs/roadmap_status.md, docs/spec_review_lifecycle.md, docs/template_project_guide.md	Input, response, lineage, and database contracts restrict requires_second_review to false. Tests cover rejected true values, database enforcement, and policy hashes. Documentation describes the same constraint and deferred second-review behavior.
Upgrade and retained-row checks backend/alembic/versions/0024_require_second_review_false.py, backend/alembic/env.py, backend/tests/projects/review_policy/test_migration.py, backend/tests/test_alembic.py, backend/tests/tasks/test_payment_policy_migration.py, backend/tests/conftest.py, backend/scripts/test_lane_catalogue.py, .commitrail/changes/enforce-requires-second-review-false.md	Migration 0024 locks review_policies and aborts with SQLSTATE 23514 if any row has requires_second_review=true. Otherwise, it adds the false-only check constraint. Migration tests check retained data and selector state; Alembic configuration and related revision assertions are updated.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Merge Risk: 🟡 Moderate · up to 08bb0

Reconcile this branch with post-#487 main and update the recorded revision before approval; the current branch and record still reflect the pre-merge baseline.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 18.18% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 22 functions across 16 files. (2 skipped:…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
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.
Title check	✅ Passed	The title clearly identifies the main change: restricting the project review policy to false for second-review requirements.
Description check	✅ Passed	The description is detailed and covers intent, design, scope, behavior, migration safety, validation, test results, CI evidence, and remaining impact. It does not reproduce every optional template hea…

Full details: Docstring Coverage

Explanation

Docstring coverage is 18.18% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 22 functions across 16 files. (2 skipped: 2 unsupported.)

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Actionable comments posted: 1

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Inline comments:
Review comments at @.commitrail/changes/enforce-requires-second-review-false.md:
- Around line 90-92: Update the current-source reconciliation in the change
record after PR #502 is rebased or retargeted, replacing the stale 235f9e1b
reference with the actual post-merge main commit and ensuring the record
describes that source accurately.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 9ade18fe-4d9f-4290-9a91-887b270feb08

📥 Commits

Reviewing files that changed from the base of the PR and between dcbae84 and 08bb029.

📒 Files selected for processing (6)

• .commitrail/changes/enforce-requires-second-review-false.md
• backend/alembic/env.py
• backend/scripts/test_lane_catalogue.py
• backend/tests/conftest.py
• backend/tests/tasks/test_payment_policy_migration.py
• docs/roadmap_status.md

🚧 Files skipped from review as they are similar to previous changes (1)

• docs/roadmap_status.md

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