docs(12): finalize plan — validation map, research resolution, roadmap waves

Resolve plan-checker warning (mark RESEARCH Open Questions RESOLVED),
fill VALIDATION.md Nyquist map (nyquist_compliant), record planning
complete in STATE, annotate ROADMAP wave dependencies.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.planning/STATE.md

@@ -3,13 +3,13 @@ gsd_state_version: 1.0
 milestone: v1.1
 milestone_name: Operability & Polish
 status: executing
-stopped_at: Phase 18 context gathered
-last_updated: "2026-06-15T01:25:46.051Z"
-last_activity: 2026-06-14
+stopped_at: Phase 12 UI-SPEC approved
+last_updated: "2026-06-15T15:49:47.164Z"
+last_activity: 2026-06-15 -- Phase 12 planning complete
 progress:
   total_phases: 23
   completed_phases: 9
-  total_plans: 32
+  total_plans: 36
   completed_plans: 32
   percent: 39
 ---
@@ -28,7 +28,7 @@ See: .planning/PROJECT.md (updated 2026-06-10)
 Phase: 13
 Plan: Not started
 Status: Ready to execute
-Last activity: 2026-06-14
+Last activity: 2026-06-15 -- Phase 12 planning complete
 
 ### ✅ Resolved Checkpoint — Phase 15 Plan 15-03 Task 2 (human-action)
 
@@ -252,9 +252,9 @@ Recent decisions affecting current work:
 
 ## Session Continuity
 
-Last session: 2026-06-15T01:25:46.029Z
-Stopped at: Phase 18 context gathered
-Resume file: .planning/phases/18-auto-timezone-detection-and-ability-to-change-timezone/18-CONTEXT.md
+Last session: 2026-06-15T15:15:40.328Z
+Stopped at: Phase 12 UI-SPEC approved
+Resume file: .planning/phases/12-initial-setup-wizard/12-UI-SPEC.md
 
 ## Operator Next Steps