docs(phase-20): add validation strategy

.planning/phases/20-fab-full-screen-catalog-search/20-VALIDATION.md

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+---
+phase: 20
+slug: fab-full-screen-catalog-search
+status: draft
+nyquist_compliant: false
+wave_0_complete: false
+created: 2026-04-06
+---
+
+# Phase 20 — Validation Strategy
+
+> Per-phase validation contract for feedback sampling during execution.
+
+---
+
+## Test Infrastructure
+
+| Property | Value |
+|----------|-------|
+| **Framework** | bun test |
+| **Config file** | none — built-in to Bun |
+| **Quick run command** | `bun test` |
+| **Full suite command** | `bun test` |
+| **Estimated runtime** | ~10 seconds (service tests only, no E2E) |
+
+---
+
+## Sampling Rate
+
+- **After every task commit:** Run `bun test`
+- **After every plan wave:** Run `bun test`
+- **Before `/gsd:verify-work`:** Full suite must be green
+- **Max feedback latency:** 10 seconds
+
+---
+
+## Per-Task Verification Map
+
+| Task ID | Plan | Wave | Requirement | Test Type | Automated Command | File Exists | Status |
+|---------|------|------|-------------|-----------|-------------------|-------------|--------|
+| TBD | TBD | TBD | CATFLOW-01 | grep/visual | `grep -r "fabMenuOpen" src/client/` | ❌ W0 | ⬜ pending |
+| TBD | TBD | TBD | CATFLOW-02 | grep/visual | `grep -r "catalogSearchOpen" src/client/` | ❌ W0 | ⬜ pending |
+
+*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*
+
+---
+
+## Wave 0 Requirements
+
+*Frontend phase — primary verification is visual + grep-based. No new test files needed for UI components (existing test infrastructure covers service layer).*
+
+---
+
+## Manual-Only Verifications
+
+| Behavior | Requirement | Why Manual | Test Instructions |
+|----------|-------------|------------|-------------------|
+| FAB mini menu opens/closes with animation | CATFLOW-01 | Visual/animation behavior | Click FAB, verify menu fans out, click backdrop to close |
+| Full-screen search overlay opens from FAB menu | CATFLOW-02 | Visual overlay behavior | Click "Add to Collection" in FAB menu, verify overlay appears |
+| Tag chips filter search results | CATFLOW-02 | UI interaction | Type query, tap tag chips, verify results filter |
+| Search results display with correct data | CATFLOW-02 | Visual data display | Search for known item, verify card shows name/weight/price |
+
+---
+
+## 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 < 10s
+- [ ] `nyquist_compliant: true` set in frontmatter
+
+**Approval:** pending