docs(04-03): complete Phase 4 verification gate plan

- dart analyze --fatal-infos: zero issues
- flutter test: 89/89 tests pass (72 original + 12 notification + 5 settings widget)
- NOTF-01 confirmed: NotificationService, DailyPlanDao queries, Android config, timezone init
- NOTF-02 confirmed: NotificationSettingsNotifier, SettingsScreen section, toggle, time picker
- Phase 4 (Notifications) fully complete — all 4 phases of v1.0 milestone done

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

.planning/ROADMAP.md

@@ -15,7 +15,7 @@ Decimal phases appear between their surrounding integers in numeric order.
 - [x] **Phase 1: Foundation** - Project scaffold, database, state management, theme, and localization infrastructure (completed 2026-03-15)
 - [x] **Phase 2: Rooms and Tasks** - Complete room CRUD, task CRUD with auto-scheduling, and bundled templates (completed 2026-03-15)
 - [x] **Phase 3: Daily Plan and Cleanliness** - Primary daily plan screen with overdue/today/upcoming, cleanliness indicators per room (completed 2026-03-16)
-- [ ] **Phase 4: Notifications** - Daily summary notification with configurable time and Android permission handling
+- [x] **Phase 4: Notifications** - Daily summary notification with configurable time and Android permission handling (completed 2026-03-16)
 
 ## Phase Details
 
@@ -97,4 +97,4 @@ Note: Phase 4 depends on Phase 2 (needs scheduling data) but can be developed in
 | 1. Foundation | 2/2 | Complete    | 2026-03-15 |
 | 2. Rooms and Tasks | 5/5 | Complete    | 2026-03-15 |
 | 3. Daily Plan and Cleanliness | 3/3 | Complete   | 2026-03-16 |
-| 4. Notifications | 2/3 | In Progress|  |
+| 4. Notifications | 3/3 | Complete   | 2026-03-16 |