docs(01): add research and validation strategy

.planning/phases/01-core-foundation/01-VALIDATION.md

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+---
+phase: 01
+slug: core-foundation
+status: draft
+nyquist_compliant: false
+wave_0_complete: false
+created: 2026-03-10
+---
+
+# Phase 01 — Validation Strategy
+
+> Per-phase validation contract for feedback sampling during execution.
+
+---
+
+## Test Infrastructure
+
+| Property | Value |
+|----------|-------|
+| **Framework** | Vitest 3.x |
+| **Config file** | vitest.config.ts (Wave 0 creates) |
+| **Quick run command** | `npm run test` |
+| **Full suite command** | `npm run test -- --run` |
+| **Estimated runtime** | ~2 seconds |
+
+---
+
+## Sampling Rate
+
+- **After every task commit:** Run `npm run test`
+- **After every plan wave:** Run `npm run test -- --run`
+- **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 |
+|---------|------|------|-------------|-----------|-------------------|-------------|--------|
+| 01-01-01 | 01 | 1 | CORE-01 | unit | `npm run test` | ❌ W0 | ⬜ pending |
+| 01-01-02 | 01 | 1 | CORE-01 | unit | `npm run test` | ❌ W0 | ⬜ pending |
+| 01-02-01 | 02 | 1 | CORE-01 | unit | `npm run test` | ❌ W0 | ⬜ pending |
+| 01-02-02 | 02 | 1 | CORE-01 | unit | `npm run test` | ❌ W0 | ⬜ pending |
+| 01-03-01 | 03 | 1 | CORE-01 | unit | `npm run test` | ❌ W0 | ⬜ pending |
+
+*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*
+
+---
+
+## Wave 0 Requirements
+
+- [ ] `vitest.config.ts` — test framework configuration
+- [ ] `src/__tests__/config.test.ts` — verifies config constants are valid
+- [ ] `src/__tests__/Tile.test.ts` — verifies tile model behavior
+- [ ] `src/__tests__/GameLoop.test.ts` — verifies loop start/stop/tick
+- [ ] `src/__tests__/EventEmitter.test.ts` — verifies typed emit/on
+- [ ] Framework install: `npm install -D vitest @vitest/coverage-v8 @types/node`
+
+---
+
+## Manual-Only Verifications
+
+| Behavior | Requirement | Why Manual | Test Instructions |
+|----------|-------------|------------|-------------------|
+| Canvas renders colored background | CORE-01 | Visual verification | Run `npm run dev`, verify colored Canvas appears |
+
+---
+
+## 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