docs(phase-19): add validation strategy

.planning/phases/19-reference-item-model-tags-schema/19-VALIDATION.md

@@ -0,0 +1,73 @@
+---
+phase: 19
+slug: reference-item-model-tags-schema
+status: draft
+nyquist_compliant: false
+wave_0_complete: false
+created: 2026-04-05
+---
+
+# Phase 19 — 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** | ~5 seconds |
+
+---
+
+## 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:** 5 seconds
+
+---
+
+## Per-Task Verification Map
+
+| Task ID | Plan | Wave | Requirement | Test Type | Automated Command | File Exists | Status |
+|---------|------|------|-------------|-----------|-------------------|-------------|--------|
+| TBD | TBD | TBD | CATFLOW-03 | unit+integration | `bun test` | ✅ | ⬜ pending |
+| TBD | TBD | TBD | CATFLOW-04 | unit+integration | `bun test` | ✅ | ⬜ pending |
+| TBD | TBD | TBD | CATFLOW-05 | unit+integration | `bun test` | ✅ | ⬜ pending |
+| TBD | TBD | TBD | CATFLOW-06 | unit+integration | `bun test` | <20><> | ⬜ pending |
+| TBD | TBD | TBD | TAG-01 | unit | `bun test` | ✅ | ⬜ pending |
+| TBD | TBD | TBD | TAG-02 | unit+integration | `bun test` | ✅ | ⬜ pending |
+
+*Status: ⬜ pending · ✅ green · ❌ red · ⚠<><E29AA0><EFBFBD> flaky*
+
+---
+
+## Wave 0 Requirements
+
+*Existing infrastructure covers all phase requirements — test helper `createTestDb()` needs schema updates for new tables.*
+
+---
+
+## Manual-Only Verifications
+
+*All phase behaviors have automated verification.*
+
+---
+
+## 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 < 5s
+- [ ] `nyquist_compliant: true` set in frontmatter
+
+**Approval:** pending