| Field | Value |
|---|---|
| Branch | fix/validator-parity-and-audit-closure |
| Classification | quick-win |
| Classified by | Claude Opus 4.8 (1M) |
| Frozen | true |
| Created Date | 2026-05-29 |
| Owner | luvseldom (session 2026-05-29) |
| Guardrails Mode | Quick |
| Current Phase | ship |
| Checkpoint SHA | f83b32fdc5ac6b2d2f8ac07f2b003494be4d6db1 |
| Recommended Skills | verification-before-completion, karpathy-principles |
| Primary Domain Snapshot | none |

## Session Info
- Agent: Claude Opus 4.8 (1M context)
- Session: 2026-05-29
- Platform: Antigravity
- Guardrails loaded: skipped (quick-win)

## Drift Log
- Skip Attempt: NO
- Gate Fail Reason: N/A
- Token Leak: NO

## Task Description
- Close out the final two 2026-05-29 audit items after INDEPENDENT verification:
  - **D (#44, REAL gap)**: validate.ps1 is missing the gate-receipt-schema check (Verdict/Classification field validation on `- Gate:` receipts, active + archived) that validate.sh has at lines 1506-1535 (active) + 1662-1688 (archived). Backfill into validate.ps1 for cross-platform parity (WARN-level).
  - **C3 (#43, FALSE ALARM — verified)**: the claimed disjoint-lock lost-update does NOT exist. cmd_write (guard_context_write.py:582) wraps BOTH replace and append in `file_lock(lock_path_for_target)`; append_write's internal `.guard.lock` sidecar (line 467) is a redundant nested lock, and the ONLY callers of append_write/atomic_write are inside cmd_write (lines 610/613). No disjoint locks reachable. Action: add defensive docstrings to append_write/atomic_write warning they must be called under cmd_write's lock (closes the latent direct-call footgun), and reclassify #43 to Cancelled (not-a-bug).
  - Also: the parity sub-agent's OTHER claims (sentinel emoji, spec-template, Project Name, spec-status frontmatter) were all FALSE — validate.ps1 already has parity (lines 1191, 1897-1921, 1957-1979). Only the gate-receipt-schema gap is real.
- 2 of 3 deep findings (C3 + most of D) were same-vendor sub-agent false alarms → reinforces verify-before-build lesson.
- Phase chain: /implement → /ship (quick-win)

## Phase Sequence
- bootstrap
- implement

## External References
none

## Known Risk
- PS1 regex must match the same receipts as bash (`^- Gate:` pipe-format, case-insensitive). Mitigation: mirror bash regex; verify with validate.ps1 run on real work logs.
- Rollback: revert the single commit.

## Conflict Resolution
none

## Skill Notes
none

## Phase Summary
- bootstrap: quick-win; D = 1 real gap (PS1 gate-receipt-schema), C3 = verified false alarm; classified by verification not sub-agent claims.
- implement: PS1 gate-receipt-schema backfill (active+archived) + C3 defensive docstrings; both validators fail=0 identical verdicts; 94 guard tests pass.
- ship: SSoT Seq 24 + Ship History; lesson #15; backlog #44 Shipped/#43 Cancelled; commit 55ed8ea.

## Gate Evidence
- Gate: bootstrap | Verdict: PASS | Classification: quick-win | Timestamp: 2026-05-29
- Gate: plan | Verdict: PASS | Classification: quick-win | Timestamp: 2026-05-29
- Gate: implement | Verdict: PASS | Classification: quick-win | Timestamp: 2026-05-29
- Gate: ship | Verdict: PASS | Classification: quick-win | Timestamp: 2026-05-29

## Evidence
- C3 verification: grep shows only callers of append_write(613)/atomic_write(610) are inside cmd_write's file_lock block (582-625) → no disjoint-lock path. False alarm confirmed.
- D verification: validate.ps1 grep for gate-receipt-schema returned nothing; validate.sh has it (1506-1535, 1662-1688). Other parity claims falsified (PS1 lines 1191/1897-1921/1957-1979 have parity).
- D post-impl: validate.ps1 + validate.sh both emit identical gate-receipt-schema verdicts (active PASS; archived WARN:1 = ship-history-2026.md, immutable). Both fail=0.
- C3 post-impl: defensive docstrings on atomic_write + append_write; no logic change; guard tests 94 passed.
- Ship: SSoT Seq 24 + Ship History (guard CAS new_sha 3af73f4); Global Lesson #15 (false-alarm rate, chain intact); backlog #44 Shipped, #43 Cancelled.
- ship phase summary: PASS; commit 55ed8ea; closure Open PR.
