chore: complete v1.2 milestone — archive roadmap, requirements, update retrospective

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.planning/STATE.md

@@ -2,9 +2,9 @@
 gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
-status: Milestone complete
-stopped_at: Completed 11-02-PLAN.md
-last_updated: "2026-04-03T19:34:04.601Z"
+status: v1.2 milestone complete
+stopped_at: Phase 11 complete, milestone v1.2 complete — all 4 phases finished
+last_updated: "2026-04-03T19:51:43.557Z"
 progress:
   total_phases: 4
   completed_phases: 4
@@ -19,7 +19,7 @@ progress:
 See: .planning/PROJECT.md (updated 2026-04-03)
 
 **Core value:** Users can see what needs doing today, mark it done, and trust the app to schedule the next occurrence — without thinking about it.
-**Current focus:** Milestone v1.2 complete — all phases finished
+**Current focus:** Planning next milestone
 
 ## Current Position