docs(phase-11): add validation strategy

.planning/phases/11-candidate-ranking/11-VALIDATION.md

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+---
+phase: 11
+slug: candidate-ranking
+status: draft
+nyquist_compliant: false
+wave_0_complete: false
+created: 2026-03-16
+---
+
+# Phase 11 — Validation Strategy
+
+> Per-phase validation contract for feedback sampling during execution.
+
+---
+
+## Test Infrastructure
+
+| Property | Value |
+|----------|-------|
+| **Framework** | Bun test (built-in) |
+| **Config file** | none — `bun test` auto-discovers `*.test.ts` |
+| **Quick run command** | `bun test tests/services/thread.service.test.ts` |
+| **Full suite command** | `bun test` |
+| **Estimated runtime** | ~5 seconds |
+
+---
+
+## Sampling Rate
+
+- **After every task commit:** Run `bun test tests/services/thread.service.test.ts`
+- **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 | 01 | 1 | RANK-01 | unit | `bun test tests/services/thread.service.test.ts` | ❌ W0 | ⬜ pending |
+| TBD | 01 | 1 | RANK-01 | integration | `bun test tests/routes/threads.test.ts` | ❌ W0 | ⬜ pending |
+| TBD | 01 | 1 | RANK-04 | unit | `bun test tests/services/thread.service.test.ts` | ❌ W0 | ⬜ pending |
+| TBD | 01 | 1 | RANK-05 | unit | `bun test tests/services/thread.service.test.ts` | ❌ W0 | ⬜ pending |
+| TBD | 01 | 1 | RANK-05 | integration | `bun test tests/routes/threads.test.ts` | ❌ W0 | ⬜ pending |
+| TBD | 02 | 1 | RANK-02 | manual | Visual inspection | N/A | ⬜ pending |
+
+*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*
+
+---
+
+## Wave 0 Requirements
+
+- [ ] New test cases in `tests/services/thread.service.test.ts` — covers RANK-01, RANK-04, RANK-05 service behavior
+- [ ] New test cases in `tests/routes/threads.test.ts` — covers RANK-01, RANK-05 route behavior
+- [ ] Update `tests/helpers/db.ts` CREATE TABLE for `thread_candidates` to add `sort_order REAL NOT NULL DEFAULT 0`
+
+---
+
+## Manual-Only Verifications
+
+| Behavior | Requirement | Why Manual | Test Instructions |
+|----------|-------------|------------|-------------------|
+| Rank badge rendering (gold/silver/bronze medal icons on top 3) | RANK-02 | No component test infrastructure; visual verification required | Open thread with 3+ candidates, verify top 3 show medal icons with correct colors |
+| Drag handle visibility and interaction | RANK-01 | Visual/interaction verification | Open active thread in list view, verify grip icons visible, drag to reorder |
+| Drag handle absent on resolved thread | RANK-05 | Visual verification | Open resolved thread, verify no grip icons, rank badges still visible (static) |
+
+---
+
+## 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