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-RESEARCH.md

@@ -729,7 +729,7 @@ export async function driveA33(
 
 (Table is not empty; A1-A6 should be acknowledged by the planner. A1 + A2 in particular have post-fix grep + UAT-green verification gates that catch them quickly.)
 
-## Open Questions
+## Open Questions (RESOLVED)
 
 1. **Will the offscreen document actually survive 5 minutes of SW idle?**
    - What we know: Chrome docs say offscreen has its own lifecycle independent of SW; recorder.ts MediaRecorder is the "compelling reason" to keep offscreen alive.