docs(phase-3): add validation strategy

.planning/phases/03-daily-plan-and-cleanliness/03-VALIDATION.md

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+---
+phase: 3
+slug: daily-plan-and-cleanliness
+status: draft
+nyquist_compliant: false
+wave_0_complete: false
+created: 2026-03-16
+---
+
+# Phase 3 — Validation Strategy
+
+> Per-phase validation contract for feedback sampling during execution.
+
+---
+
+## Test Infrastructure
+
+| Property | Value |
+|----------|-------|
+| **Framework** | flutter_test (built-in) |
+| **Config file** | none — standard Flutter test setup |
+| **Quick run command** | `flutter test test/features/home/` |
+| **Full suite command** | `flutter test` |
+| **Estimated runtime** | ~15 seconds |
+
+---
+
+## Sampling Rate
+
+- **After every task commit:** Run `flutter test test/features/home/`
+- **After every plan wave:** Run `flutter test`
+- **Before `/gsd:verify-work`:** Full suite must be green
+- **Max feedback latency:** 15 seconds
+
+---
+
+## Per-Task Verification Map
+
+| Task ID | Plan | Wave | Requirement | Test Type | Automated Command | File Exists | Status |
+|---------|------|------|-------------|-----------|-------------------|-------------|--------|
+| 03-01-01 | 01 | 1 | PLAN-01 | unit | `flutter test test/features/home/data/daily_plan_dao_test.dart` | ❌ W0 | ⬜ pending |
+| 03-01-02 | 01 | 1 | PLAN-02 | unit | `flutter test test/features/home/data/daily_plan_dao_test.dart` | ❌ W0 | ⬜ pending |
+| 03-01-03 | 01 | 1 | PLAN-03 | unit | `flutter test test/features/home/data/daily_plan_dao_test.dart` | ❌ W0 | ⬜ pending |
+| 03-01-04 | 01 | 1 | PLAN-05 | unit | `flutter test test/features/home/data/daily_plan_dao_test.dart` | ❌ W0 | ⬜ pending |
+| 03-02-01 | 02 | 2 | PLAN-04 | unit | `flutter test test/features/tasks/data/tasks_dao_test.dart` | ✅ | ⬜ pending |
+| 03-02-02 | 02 | 2 | PLAN-06 | widget | `flutter test test/features/home/presentation/home_screen_test.dart` | ❌ W0 | ⬜ pending |
+| 03-02-03 | 02 | 2 | CLEAN-01 | unit | `flutter test test/features/rooms/data/rooms_dao_test.dart` | ✅ | ⬜ pending |
+
+*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*
+
+---
+
+## Wave 0 Requirements
+
+- [ ] `test/features/home/data/daily_plan_dao_test.dart` — stubs for PLAN-01, PLAN-02, PLAN-03, PLAN-05 (cross-room join query, date categorization, completion count)
+- [ ] `test/features/home/presentation/home_screen_test.dart` — stubs for PLAN-06 (empty state rendering) and basic section rendering
+
+*Existing infrastructure covers PLAN-04 (tasks_dao_test.dart) and CLEAN-01 (rooms_dao_test.dart).*
+
+---
+
+## Manual-Only Verifications
+
+| Behavior | Requirement | Why Manual | Test Instructions |
+|----------|-------------|------------|-------------------|
+| Task completion slide-out animation | PLAN-04 | Visual animation timing cannot be automated | Complete a task, verify smooth slide-out animation |
+| Collapsed/expanded Demnächst toggle | PLAN-03 | Interactive UI behavior | Tap Demnächst header, verify expand/collapse |
+| Progress counter updates in real-time | PLAN-05 | Visual state update after animation | Complete task, verify counter increments |
+
+---
+
+## Validation Sign-Off
+
+- [ ] All tasks have `<automated>` verify or Wave 0 dependencies
+- [ ] Sampling continuity: no 3 consecutive tasks without automated verify
+- [ ] Wave 0 covers all MISSING references
+- [ ] No watch-mode flags
+- [ ] Feedback latency < 15s
+- [ ] `nyquist_compliant: true` set in frontmatter
+
+**Approval:** pending