chore: complete v1.0 MVP milestone

Archive roadmap and requirements to milestones/, evolve PROJECT.md
with validated requirements and decision outcomes, reorganize
ROADMAP.md with milestone grouping, create retrospective.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.planning/MILESTONES.md

@@ -0,0 +1,20 @@
+# Milestones
+
+## v1.0 MVP (Shipped: 2026-03-16)
+
+**Phases completed:** 4 phases, 13 plans
+**Codebase:** 10,588 LOC Dart (7,773 lib + 2,815 test), 89 tests, 76 commits
+**Timeline:** 2 days (2026-03-15 to 2026-03-16)
+
+**Key accomplishments:**
+1. Flutter project with Drift SQLite, Riverpod 3 state management, ARB localization, and calm sage & stone Material 3 theme
+2. Full room CRUD with drag-and-drop reorder, icon picker, and cleanliness indicator per room card
+3. Task CRUD with 11 frequency presets + custom intervals, calendar-anchored scheduling with anchor memory, and auto-calculated next due dates
+4. Bundled German-language task templates for 14 room types with post-creation template picker
+5. Daily plan home screen with overdue/today/tomorrow sections, animated checkbox completion, and progress tracking
+6. Daily summary notification with configurable time, POST_NOTIFICATIONS permission handling, and boot receiver rescheduling
+
+**Archive:** See `milestones/v1.0-ROADMAP.md` and `milestones/v1.0-REQUIREMENTS.md`
+
+---
+