docs(phase-26): add research and validation strategy

.planning/phases/26-discovery-landing-page/26-VALIDATION.md

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+---
+phase: 26
+slug: discovery-landing-page
+status: draft
+nyquist_compliant: false
+wave_0_complete: false
+created: 2026-04-10
+---
+
+# Phase 26 — Validation Strategy
+
+> Per-phase validation contract for feedback sampling during execution.
+
+---
+
+## Test Infrastructure
+
+| Property | Value |
+|----------|-------|
+| **Framework** | Bun test runner (built-in) |
+| **Config file** | none — `bun test` auto-discovers `*.test.ts` |
+| **Quick run command** | `bun test tests/services/discovery.service.test.ts tests/routes/discovery.test.ts` |
+| **Full suite command** | `bun test` |
+| **Estimated runtime** | ~15 seconds |
+
+---
+
+## Sampling Rate
+
+- **After every task commit:** Run `bun test tests/services/discovery.service.test.ts tests/routes/discovery.test.ts`
+- **After every plan wave:** Run `bun test`
+- **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 |
+|---------|------|------|-------------|-----------|-------------------|-------------|--------|
+| 26-01-01 | 01 | 1 | DISC-02 | unit | `bun test tests/services/discovery.service.test.ts` | ❌ W0 | ⬜ pending |
+| 26-01-02 | 01 | 1 | DISC-03 | unit | `bun test tests/services/discovery.service.test.ts` | ❌ W0 | ⬜ pending |
+| 26-01-03 | 01 | 1 | DISC-04 | unit | `bun test tests/services/discovery.service.test.ts` | ❌ W0 | ⬜ pending |
+| 26-01-04 | 01 | 1 | INFR-02 | unit | `bun test tests/services/discovery.service.test.ts` | ❌ W0 | ⬜ pending |
+| 26-01-05 | 01 | 1 | DISC-02 | integration | `bun test tests/routes/discovery.test.ts` | ❌ W0 | ⬜ pending |
+| 26-01-06 | 01 | 1 | DISC-03 | integration | `bun test tests/routes/discovery.test.ts` | ❌ W0 | ⬜ pending |
+| 26-01-07 | 01 | 1 | DISC-04 | integration | `bun test tests/routes/discovery.test.ts` | ❌ W0 | ⬜ pending |
+| 26-02-01 | 02 | 2 | DISC-01 | smoke | E2E only — overlay integration | ❌ E2E | ⬜ pending |
+| 26-02-02 | 02 | 2 | DISC-05 | smoke | E2E only — requires auth session | ❌ E2E | ⬜ pending |
+
+*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*
+
+---
+
+## Wave 0 Requirements
+
+- [ ] `tests/services/discovery.service.test.ts` — stubs for DISC-02, DISC-03, DISC-04, INFR-02
+- [ ] `tests/routes/discovery.test.ts` — stubs for DISC-02, DISC-03, DISC-04 route layer
+- [ ] `src/server/services/discovery.service.ts` — new service file (stub)
+- [ ] `src/server/routes/discovery.ts` — new route file (stub)
+
+*Existing infrastructure covers test helpers (createTestDb, in-memory Postgres via PGlite).*
+
+---
+
+## Manual-Only Verifications
+
+| Behavior | Requirement | Why Manual | Test Instructions |
+|----------|-------------|------------|-------------------|
+| Hero search bar triggers CatalogSearchOverlay | DISC-01 | Client interaction; E2E pending rewrite (999.1) | Load `/`, click search bar, verify overlay opens |
+| "Go to Collection" CTA visible for authenticated users | DISC-05 | Requires auth session; E2E pending rewrite | Log in, visit `/`, verify CTA present |
+| "Go to Collection" CTA absent for anonymous | DISC-05 | Requires anonymous session | Open incognito, visit `/`, verify no CTA |
+
+---
+
+## 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