docs(phase-2): add validation strategy

.planning/phases/02-layout-and-brand-identity/02-VALIDATION.md

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+---
+phase: 2
+slug: layout-and-brand-identity
+status: draft
+nyquist_compliant: false
+wave_0_complete: false
+created: 2026-03-11
+---
+
+# Phase 2 — Validation Strategy
+
+> Per-phase validation contract for feedback sampling during execution.
+
+---
+
+## Test Infrastructure
+
+| Property | Value |
+|----------|-------|
+| **Framework** | Vitest 4.0.18 + @testing-library/react 16.3.2 |
+| **Config file** | `frontend/vite.config.ts` (test section present) |
+| **Quick run command** | `cd frontend && bun vitest run --reporter=verbose` |
+| **Full suite command** | `cd frontend && bun vitest run` |
+| **Estimated runtime** | ~15 seconds |
+
+---
+
+## Sampling Rate
+
+- **After every task commit:** Run `cd frontend && bun vitest run --reporter=verbose`
+- **After every plan wave:** Run `cd frontend && bun vitest run && bun run build`
+- **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 |
+|---------|------|------|-------------|-----------|-------------------|-------------|--------|
+| 02-00-01 | 00 | 0 | AUTH-01, AUTH-02, AUTH-04 | unit stub | `bun vitest run src/pages/LoginPage.test.tsx` | ❌ W0 | ⬜ pending |
+| 02-00-02 | 00 | 0 | AUTH-03 | unit stub | `bun vitest run src/pages/RegisterPage.test.tsx` | ❌ W0 | ⬜ pending |
+| 02-00-03 | 00 | 0 | NAV-01, NAV-02, NAV-03, NAV-04 | unit stub | `bun vitest run src/components/AppLayout.test.tsx` | ❌ W0 | ⬜ pending |
+| 02-01-01 | 01 | 1 | AUTH-01 | unit | `bun vitest run src/pages/LoginPage.test.tsx` | ❌ W0 | ⬜ pending |
+| 02-01-02 | 01 | 1 | AUTH-02 | unit | `bun vitest run src/pages/LoginPage.test.tsx` | ❌ W0 | ⬜ pending |
+| 02-01-03 | 01 | 1 | AUTH-03 | unit | `bun vitest run src/pages/RegisterPage.test.tsx` | ❌ W0 | ⬜ pending |
+| 02-01-04 | 01 | 1 | AUTH-04 | unit | `bun vitest run src/pages/LoginPage.test.tsx` | ❌ W0 | ⬜ pending |
+| 02-02-01 | 02 | 1 | NAV-01 | unit | `bun vitest run src/components/AppLayout.test.tsx` | ❌ W0 | ⬜ pending |
+| 02-02-02 | 02 | 1 | NAV-02 | unit | `bun vitest run src/components/AppLayout.test.tsx` | ❌ W0 | ⬜ pending |
+| 02-02-03 | 02 | 1 | NAV-03 | unit | `bun vitest run src/components/AppLayout.test.tsx` | ❌ W0 | ⬜ pending |
+| 02-02-04 | 02 | 1 | NAV-04 | unit | `bun vitest run src/components/AppLayout.test.tsx` | ❌ W0 | ⬜ pending |
+
+*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*
+
+---
+
+## Wave 0 Requirements
+
+- [ ] `frontend/src/pages/LoginPage.test.tsx` — stubs for AUTH-01, AUTH-02, AUTH-04
+- [ ] `frontend/src/pages/RegisterPage.test.tsx` — stubs for AUTH-03
+- [ ] `frontend/src/components/AppLayout.test.tsx` — stubs for NAV-01, NAV-02, NAV-03, NAV-04
+- [ ] `frontend/src/components/ui/alert.tsx` — must exist before any test imports it (install via `bunx --bun shadcn add alert`)
+
+---
+
+## Manual-Only Verifications
+
+| Behavior | Requirement | Why Manual | Test Instructions |
+|----------|-------------|------------|-------------------|
+| Gradient background visually reads as pastel | AUTH-01 | Visual quality judgment | Open login page in browser; gradient should feel like tinted paper, not a colorful splash |
+| Wordmark gradient text is legible and branded | AUTH-02 | Visual quality judgment | App name should display with gradient color fill; text must not disappear |
+| Active nav item is clearly distinguishable | NAV-03 | Contrast perception | Click different nav items; active state must produce a perceptible visual change |
+| Sidebar collapse animation is smooth | NAV-04 | Animation quality | Click SidebarTrigger; sidebar should animate smoothly without content jumps |
+
+---
+
+## 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