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Phase 2 Reviewer Closeout

Reviewer pass for Phase 2 Builder closeout and the promoted REV-P1-004 traceability coverage evidence.

  • Reviewed at: 2026-04-29
  • Reviewer role: Phase 2 Reviewer
  • Approved identity: GPT-5 / Codex, approved by maintainer in session
  • Scope:
    • spec/phase2/
    • prompt/PHASE2_KICK_BUILDER.md
    • trace/phase2/status.yaml
    • trace/phase2/tracker.md
    • trace/phase2/traceability-coverage.md
    • scripts/traceability-coverage.ts
    • scripts/traceability-coverage.test.ts
  • Mode: read-only review; no remediation performed

Findings

REV-P2-001 [blocker] B2.7 closes unproven acceptance scenarios

Evidence:

  • spec/phase2/SPEC_TEST_MATRIX.md still lists TC-PKG-004, TC-PRAD-007, TC-PRAD-008, and TC-RSRM-009 as Phase 2 acceptance scenarios.
  • prompt/PHASE2_KICK_BUILDER.md says Phase 2 Builder work is complete only when all Phase 2 scenarios are green or explicitly waived by the maintainer.
  • trace/phase2/status.yaml records builder_batches_complete: met, while B2.7 self-records PKG-006, PRAD-008, and PRAD-007 as waived for closeout.
  • PRAD-007 is a P1 requirement that expects Remotion Player errors and Cadenza runtime diagnostics to share one preview diagnostics channel, but B2.7 explicitly says Remotion Player error aggregation was waived.

Why it matters:

The closeout record treats Builder-owned scope as complete without visible maintainer waiver evidence for the unimplemented or unproven scenarios. This is a false closeout risk: reviewer cannot distinguish maintainer-approved waiver from Builder-side scope shrinkage.

Recommended remediation:

Either add explicit maintainer waiver evidence for the affected scenarios, or return to Builder remediation and prove the missing scenarios with tests and implementation evidence. P2 MAY items can remain waived, but the trace should record the approval source.

Verification path:

The traceability report should show each affected scenario as either backed by test and implementation evidence, or backed by an explicit maintainer waiver. builder_batches_complete should not be met without one of those states.

Recommended owner: builder-remediation, with maintainer waiver decision if needed.

REV-P2-002 [high] Coverage tool lets circular trace evidence hide gaps

Evidence:

  • trace/phase2/traceability-coverage.md shows PKG-004, PKG-006, PRAD-007, PRAD-008, RSRM-009, BROW-007, and BROW-009 with Test evidence and Implementation evidence as -.
  • The same rows still have Trace status evidence, including trace/phase2/status.yaml, trace/phase2/tracker.md, and trace/phase2/traceability-coverage.md.
  • scripts/traceability-coverage.ts only emits a finding when trace evidence, test evidence, and implementation evidence are all empty.
  • scripts/traceability-coverage.test.ts asserts the closeout requirement IDs only have non-empty trace status evidence, then expects report.findings to be empty.

Why it matters:

REV-P1-004 was originally a traceability coverage gate weakness. The Phase 2 report reintroduces the same weakness in a narrower form by allowing a status file mention, or even the generated report itself, to clear a coverage gap. This turns trace text into acceptance evidence.

Recommended remediation:

Separate real acceptance evidence from trace declarations. Status, tracker, and coverage-report files may document disposition, but they should not by themselves satisfy an acceptance scenario that requires test or implementation proof. If a requirement has no test or implementation evidence, it should remain a finding unless an explicit maintainer waiver exists.

Verification path:

Add a regression fixture where trace/phase2/status.yaml mentions a requirement, but no matching test or implementation file proves it. The report should emit a finding for that requirement.

Recommended owner: builder-remediation.

REV-P2-003 [medium] REV-P1-004 disposition is not explicit in the report

Evidence:

  • spec/phase2/SPEC_TRACEABILITY_COVERAGE.md says Phase 2 promotes the deferred REV-P1-004 governance finding into a non-mutating coverage design.
  • prompt/PHASE2_KICK_BUILDER.md success criteria say the coverage report must record REV-P1-004 evidence without editing frozen Phase 1 specs.
  • trace/phase2/traceability-coverage.md lists deferred files and markers, but does not include the REV-P1-004 ID, its source finding, or its current disposition.
  • scripts/traceability-coverage.ts only scans generic markers such as active-phase-only hard gate and Promoted into Phase 2 draft contract.

Why it matters:

The report is supposed to make the former governance gap inspectable. Without a stable REV-P1-004 disposition, a future reviewer cannot tell whether the finding is closed, converted into a report-only mitigation, or still waiting for an active-phase-only hard gate decision.

Recommended remediation:

Add an explicit REV-P1-004 disposition section to the report. It should record the original finding, the Phase 2 decision, the deferred active-phase-only hard gate follow-up, and the boundary that frozen Phase 1 specs were not edited.

Verification path:

Extend scripts/traceability-coverage.test.ts so the generated report includes REV-P1-004, the source or follow-up paths, and the current disposition.

Recommended owner: builder-remediation.

Open Questions

  • I did not find maintainer waiver evidence for PRAD-007, TC-PKG-004, or the other B2.7 waived scenarios inside the reviewed scope. If such approval exists only in chat, it should be recorded in trace before closeout is accepted.

Residual Risk

  • This pass did not inspect packages/** implementation details beyond the evidence surfaced by the named trace and coverage artifacts. The findings are about closeout truthfulness and traceability evidence, not a full code-level preview adapter audit.
  • No Builder remediation launch phrase is emitted yet because the maintainer has not selected finding IDs for remediation.

Reviewer Acceptance

  • Reviewed at: 2026-04-29 18:19 +0800
  • Reviewer role: Phase 2 Reviewer
  • Approved identity: GPT-5 / Codex, approved by maintainer in session
  • Scope:
    • REV-P2-001
    • REV-P2-002
    • REV-P2-003
    • trace/phase2/status.yaml
    • trace/phase2/tracker.md
    • trace/phase2/traceability-coverage.md
    • scripts/traceability-coverage.ts
    • scripts/traceability-coverage.test.ts
    • targeted preview evidence for TC-PKG-004 and TC-PRAD-007
  • Mode: read-only remediation review; no code remediation performed

Acceptance Decision

Accepted. The Builder remediation resolves the three selected findings well enough for Phase 2 closeout review.

Accepted Remediation Evidence

  • REV-P2-001: accepted. PKG-004 now has unit evidence for the public controller surface, PRAD-007 now has browser evidence for one preview diagnostics channel shared by Remotion Player errors and Cadenza diagnostics, and PKG-006 / PRAD-008 are recorded as maintainer-approved P2/MAY waivers rather than silently satisfied.
  • REV-P2-002: accepted. scripts/traceability-coverage.ts now separates Trace status evidence from Acceptance evidence, and emits findings when a requirement has only trace declarations and no acceptance evidence or maintainer-approved waiver. Regression tests cover both trace-only evidence and existing future paths that do not name the requirement or scenario.
  • REV-P2-003: accepted. trace/phase2/traceability-coverage.md now includes an explicit REV-P1-004 Disposition section with the source finding, Phase 2 non-mutating report mitigation, deferred active-phase-only hard gate, follow-up paths, and the boundary that frozen Phase 1 specs were not edited.

Final Verification

  • pnpm test -- scripts/traceability-coverage.test.ts packages/preview-remotion/src/navigation.test.ts passed.
  • pnpm exec playwright test tests/browser/remotion-preview.spec.ts -g TC-PRAD-007 failed in the default sandbox only at Chromium launch with sandbox_host_linux.cc / Operation not permitted; the same targeted browser test passed with elevated permissions.
  • Required closeout gates passed: pnpm typecheck, pnpm test, pnpm lint, pnpm format:check, pnpm exec markdownlint-cli2 "**/*.md", find scripts .agents -name '*.sh' -print0 | xargs -0 shfmt -d, pnpm spec:lint, pnpm phase:check, pnpm check:harness, pnpm check:memory, and git diff --check.

Acceptance Scope

  • This acceptance is scoped to the maintainer-selected remediation findings REV-P2-001, REV-P2-002, and REV-P2-003. It does not reopen a full Phase 2 preview adapter architecture or UX review.
  • Root STATUS.yaml.current_phase and trace/phase2/status.yaml closeout pointers were intentionally left unchanged during that remediation acceptance; final closeout status is recorded below.

Final Phase 2 Closeout Acceptance

  • Reviewed at: 2026-04-29 19:09 +0800
  • Reviewer role: Phase 2 Reviewer
  • Approved identity: GPT-5 / Codex, approved by maintainer in session
  • Scope:
    • trace/phase2/status.yaml
    • trace/phase2/tracker.md
    • trace/phase2/traceability-coverage.md
    • scripts/traceability-coverage.ts
    • scripts/traceability-coverage.test.ts
    • scripts/phase-check.ts
    • targeted Phase 2 preview adapter and browser evidence
  • Mode: closeout review plus root status documentation update; no production code remediation performed

Decision

Accepted. Phase 2 is ready to close from the reviewer side. The previous REV-P2-001, REV-P2-002, and REV-P2-003 false-closeout findings remain accepted as remediated, and the later REV-P1-004 governance slice is now promoted into an active-phase-only closeout gate.

Closeout Evidence

  • trace/phase2/traceability-coverage.md reports all 38 Phase 2 requirements present in specs, test matrix, and traceability matrix, with no promoted blocking coverage gaps.
  • scripts/traceability-coverage.ts --check is non-mutating and fails when an active-phase requirement lacks acceptance evidence or a maintainer-approved waiver.
  • scripts/phase-check.ts runs that active-phase coverage check once trace/phase2/status.yaml marks Builder batches complete.
  • PRAD-007, PKG-004, BROW-007, RSRM-009, and BROW-009 have current acceptance evidence; PKG-006 and PRAD-008 remain explicitly maintainer-waived P2/MAY scope.
  • Latest pushed CI on main was green: GitHub Actions run 25104871915 for commit bc80c3f.

Verification

pnpm typecheck
pnpm test
pnpm lint
pnpm format:check
pnpm exec markdownlint-cli2 "**/*.md"
find scripts .agents -name '*.sh' -print0 | xargs -0 shfmt -d
pnpm spec:lint
pnpm phase:check
node --experimental-strip-types scripts/traceability-coverage.ts --phase 2 --check
pnpm check:harness
pnpm check:memory
git diff --check
pnpm test:browser

Notes:

  • The default sandboxed pnpm test:browser run failed only at Chromium launch with sandbox_host_linux.cc:41 / Operation not permitted. The same command passed with sandbox escalation: 15/15 browser tests green.
  • Root STATUS.yaml.current_phase remains 2; this closeout does not advance the phase pointer to Phase 3.