docs(phase-30): add validation strategy

.planning/phases/30-hardware-detection-mode-selection/30-VALIDATION.md

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+---
+phase: 30
+slug: hardware-detection-mode-selection
+status: draft
+nyquist_compliant: false
+wave_0_complete: false
+created: 2026-04-02
+---
+
+# Phase 30 — Validation Strategy
+
+> Per-phase validation contract for feedback sampling during execution.
+
+---
+
+## Test Infrastructure
+
+| Property | Value |
+|----------|-------|
+| **Framework** | vitest |
+| **Config file** | server/vitest.config.ts |
+| **Quick run command** | `cd server && npx vitest run --reporter=verbose src/services/hardware-detection.test.ts` |
+| **Full suite command** | `cd server && npx vitest run --reporter=verbose` |
+| **Estimated runtime** | ~15 seconds |
+
+---
+
+## Sampling Rate
+
+- **After every task commit:** Run quick command
+- **After every plan wave:** Run full suite command
+- **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 |
+|---------|------|------|-------------|-----------|-------------------|-------------|--------|
+| 30-01-01 | 01 | 1 | ONBD-02 | unit | `vitest run hardware-detection` | ❌ W0 | ⬜ pending |
+| 30-01-02 | 01 | 1 | ONBD-03 | unit | `vitest run model-catalog` | ❌ W0 | ⬜ pending |
+| 30-02-01 | 02 | 2 | ONBD-01 | integration | `vitest run mode-selection` | ❌ W0 | ⬜ pending |
+| 30-02-02 | 02 | 2 | ONBD-07 | integration | `vitest run onboarding-probe` | ❌ W0 | ⬜ pending |
+
+*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*
+
+---
+
+## Wave 0 Requirements
+
+- [ ] `server/src/services/hardware-detection.test.ts` — stubs for ONBD-02, ONBD-03
+- [ ] `server/src/routes/system.test.ts` — stubs for unauthenticated probe endpoint
+- [ ] `ui/src/components/ModeSelector.test.tsx` — stubs for ONBD-01
+
+*If none: "Existing infrastructure covers all phase requirements."*
+
+---
+
+## Manual-Only Verifications
+
+| Behavior | Requirement | Why Manual | Test Instructions |
+|----------|-------------|------------|-------------------|
+| Apple Silicon unified memory label | ONBD-02 | Requires M-series hardware | On Mac Mini M4: call /api/system/providers, verify "unified memory" label |
+| Mode selector persists across page reload | ONBD-01 | Browser state | Select mode, refresh browser, verify selection persists |
+| Privacy premium copy visible | ONBD-07 | Visual verification | Check onboarding UI shows "runs entirely on your machine" copy |
+
+---
+
+## 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