docs(04): plan-phase closure — 3 cosmetic advisories from checker iter-2 resolved

Plan-checker iter-2 returned VERIFICATION PASSED with 3 cosmetic advisories:
- Dim 11: RESEARCH.md "## Open Questions" missing "(RESOLVED)" suffix → fixed
- Dim 12: PATTERNS.md:886 stale dispatchSaveArchiveForA33 example → added
  DEPRECATED banner citing Plan 04-04 REVISION iter-2 Option B canonical pattern
- VALIDATION.md frontmatter "4 revised tasks" mismatched per-task map (5 rows) → fixed

All 4 BLOCKER+WARNING issues from iter-1 verified resolved by iter-2 plan-checker
(VERIFICATION PASSED). 3 cosmetic items now resolved as well. 2 advisory items
left as-is per iter-1 (W2 scope-sanity at 04-06; W3 conservative 04-03 dep).

Phase 4 plans cleared for execution:
- 7 plans across 6 waves (Wave 1: 04-01+04-02 parallel; Waves 2-6 single-plan)
- Plan-checker iter-2 VERIFICATION PASSED
- Test baselines preserved: vitest 171/171 · UAT harness 33/33 · Tier-1 12

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.planning/phases/04-harden-clean-up-optional/04-VALIDATION.md

@@ -6,7 +6,7 @@ nyquist_compliant: false
 wave_0_complete: false
 created: 2026-05-21
 revised: 2026-05-21
-revision_notes: "iter-2 revision — per-task map updated for 4 revised tasks (04-02 T2 UAT grep gate; 04-04 T1 Option B chrome.runtime.sendMessage; 04-06 T4 canonical SW chunk glob; 04-07 T1 ack-grep gate)"
+revision_notes: "iter-2 revision — per-task map updated for 5 revised tasks (04-02 T2 UAT grep gate; 04-04 T1 + T2 Option B chrome.runtime.sendMessage; 04-06 T4 canonical SW chunk glob; 04-07 T1 ack-grep gate)"
 ---
 
 # Phase 04 — Validation Strategy