docs(phase-23): add validation strategy

.planning/phases/23-manual-entry-fallback/23-VALIDATION.md

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+---
+phase: 23
+slug: manual-entry-fallback
+status: draft
+nyquist_compliant: false
+wave_0_complete: false
+created: 2026-04-06
+---
+
+# Phase 23 — Validation Strategy
+
+> Per-phase validation contract for feedback sampling during execution.
+
+---
+
+## Test Infrastructure
+
+| Property | Value |
+|----------|-------|
+| **Framework** | Bun test (unit/integration), Playwright (E2E) |
+| **Config file** | `bunfig.toml`, `playwright.config.ts` |
+| **Quick run command** | `bun test` |
+| **Full suite command** | `bun test && bun run test:e2e` |
+| **Estimated runtime** | ~15 seconds (unit), ~45 seconds (E2E) |
+
+---
+
+## Sampling Rate
+
+- **After every task commit:** Run `bun test`
+- **After every plan wave:** Run `bun test && bun run test:e2e`
+- **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 |
+|---------|------|------|-------------|-----------|-------------------|-------------|--------|
+| 23-01-01 | 01 | 1 | CATFLOW-07 | E2E | `bun run test:e2e` | ❌ W0 | ⬜ pending |
+| 23-01-02 | 01 | 1 | CATFLOW-07 | manual | N/A | N/A | ⬜ pending |
+| 23-01-03 | 01 | 1 | CATFLOW-08 | manual | N/A | N/A | ⬜ pending |
+
+*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*
+
+---
+
+## Wave 0 Requirements
+
+*Existing infrastructure covers all phase requirements. No new test framework installation needed.*
+
+---
+
+## Manual-Only Verifications
+
+| Behavior | Requirement | Why Manual | Test Instructions |
+|----------|-------------|------------|-------------------|
+| "Add Manually" link visible in catalog search empty state | CATFLOW-07 | UI visibility and placement | 1. Open catalog search, 2. Search for non-existent item, 3. Verify "Add Manually" link appears |
+| Manual entry form fields and submission | CATFLOW-07 | Form interaction flow | 1. Click "Add Manually", 2. Fill required fields, 3. Submit, 4. Verify item created without globalItemId |
+| "Submit to catalog?" prompt after save | CATFLOW-08 | Non-functional UI prompt | 1. Save manual item, 2. Verify prompt appears, 3. Click "Submit to Catalog?", 4. Verify toast "Coming soon" |
+| Persistent "Add Manually" link below search results | CATFLOW-07 | UI placement when results exist | 1. Search for existing items, 2. Verify "Add Manually" link visible below results |
+
+---
+
+## 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