docs(phase-1): add validation strategy

.planning/phases/01-session-discovery/01-VALIDATION.md

@@ -0,0 +1,80 @@
+---
+phase: 1
+slug: session-discovery
+status: draft
+nyquist_compliant: false
+wave_0_complete: false
+created: 2026-03-23
+---
+
+# Phase 1 — Validation Strategy
+
+> Per-phase validation contract for feedback sampling during execution.
+
+---
+
+## Test Infrastructure
+
+| Property | Value |
+|----------|-------|
+| **Framework** | go test (stdlib) |
+| **Config file** | none — Wave 0 creates go.mod + first test files |
+| **Quick run command** | `go test ./...` |
+| **Full suite command** | `go test -v -race ./...` |
+| **Estimated runtime** | ~5 seconds |
+
+---
+
+## Sampling Rate
+
+- **After every task commit:** Run `go test ./...`
+- **After every plan wave:** Run `go test -v -race ./...`
+- **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 | DISC-01 | unit | `go test ./internal/proc/...` | ❌ W0 | ⬜ pending |
+| 01-01-02 | 01 | 1 | DISC-02 | unit | `go test ./internal/session/...` | ❌ W0 | ⬜ pending |
+| 01-01-03 | 01 | 1 | DISC-03 | unit | `go test ./internal/session/...` | ❌ W0 | ⬜ pending |
+| 01-02-01 | 02 | 1 | STATE-01 | unit | `go test ./internal/state/...` | ❌ W0 | ⬜ pending |
+| 01-02-02 | 02 | 1 | STATE-02 | unit | `go test ./internal/state/...` | ❌ W0 | ⬜ pending |
+
+*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*
+
+---
+
+## Wave 0 Requirements
+
+- [ ] `go.mod` — initialize Go module
+- [ ] `shell.nix` / `.envrc` — NixOS dev environment
+- [ ] `Makefile` — build/test/lint commands
+- [ ] Test directory structure with initial stubs
+
+*If none: "Existing infrastructure covers all phase requirements."*
+
+---
+
+## Manual-Only Verifications
+
+| Behavior | Requirement | Why Manual | Test Instructions |
+|----------|-------------|------------|-------------------|
+| `vmux list` shows all active sessions | DISC-01 | Requires multiple real Claude Code sessions running | Run 2+ claude sessions, run `vmux list`, verify all appear |
+| State detection accuracy | STATE-01 | Requires sessions in different states | Have one session working, one idle, verify correct state display |
+
+---
+
+## 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