docs(38): add validation strategy

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

.planning/phases/38-admin-tag-management/38-VALIDATION.md

@@ -0,0 +1,79 @@
+---
+phase: 38
+slug: admin-tag-management
+status: draft
+nyquist_compliant: false
+wave_0_complete: false
+created: 2026-04-19
+---
+
+# Phase 38 — Validation Strategy
+
+> Per-phase validation contract for feedback sampling during execution.
+
+---
+
+## Test Infrastructure
+
+| Property | Value |
+|----------|-------|
+| **Framework** | Bun test runner (built-in) |
+| **Config file** | `bunfig.toml` |
+| **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 | Threat Ref | Secure Behavior | Test Type | Automated Command | File Exists | Status |
+|---------|------|------|-------------|------------|-----------------|-----------|-------------------|-------------|--------|
+| 38-01-01 | 01 | 1 | ADMN-05 | — | N/A | unit | `bun test` | ❌ W0 | ⬜ pending |
+| 38-01-02 | 01 | 1 | ADMN-06 | — | N/A | unit | `bun test` | ❌ W0 | ⬜ pending |
+| 38-01-03 | 01 | 1 | ADMN-07 | — | N/A | unit | `bun test` | ❌ W0 | ⬜ pending |
+| 38-01-04 | 01 | 1 | ADMN-08, ADMN-09 | — | Cycle detection returns 400 | unit | `bun test` | ❌ W0 | ⬜ pending |
+| 38-01-05 | 01 | 1 | ADMN-10 | — | N/A | unit | `bun test` | ❌ W0 | ⬜ pending |
+
+*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*
+
+---
+
+## Wave 0 Requirements
+
+- [ ] `tests/services/tag.service.test.ts` — stubs for ADMN-05 through ADMN-10
+- [ ] `tests/routes/admin-tags.test.ts` — route-level tests for admin tag CRUD
+
+*Existing test infrastructure covers framework setup.*
+
+---
+
+## Manual-Only Verifications
+
+| Behavior | Requirement | Why Manual | Test Instructions |
+|----------|-------------|------------|-------------------|
+| Tree view collapse/expand | ADMN-05 | Client-side UI interaction | Navigate to /admin/tags, verify chevron toggles collapse/expand child rows |
+| Parent picker excludes descendants | ADMN-08 | Client-side dropdown filtering | Edit a parent tag, verify its children are excluded from parent picker options |
+| Delete confirmation modal | ADMN-10 | Client-side modal interaction | Click delete on a tag with items, verify warning shows item count and child count |
+
+---
+
+## 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