docs(01-02): complete wave-0 test infrastructure plan

- 01-02-SUMMARY.md created (Vitest 4.1.6 installed; 4 RED test files
  pinning Plans 03+04 contracts; tests/fixtures/.gitkeep marker)
- STATE.md advanced: plan 2/7 -> 3/7; progress 14% -> 29%; metric row
  added; 3 decisions logged; session continuity updated
- ROADMAP.md progress row updated: Phase 1 = 2/7 In Progress
- REQUIREMENTS.md: REVERTED premature [x] + "Complete" marking of
  REQ-video-ring-buffer (Plan 01-01 mistakenly marked it; the requirement
  is satisfied by Plans 03+04+07's implementation + ffprobe gate, not by
  RED test scaffolding). Now reads "[ ]" + "In Progress" — honest state.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.planning/STATE.md

@@ -3,15 +3,15 @@ gsd_state_version: 1.0
 milestone: v2.0.0
 milestone_name: milestone
 status: executing
-stopped_at: Completed 01-01 doc cascade — Plan 01-02 next
-last_updated: "2026-05-15T15:19:25.904Z"
+stopped_at: Plan 01-03 next (offscreen recorder TDD — flip ring-buffer + codec-check RED -> GREEN)
+last_updated: "2026-05-15T15:28:03.545Z"
 last_activity: 2026-05-15
 progress:
   total_phases: 5
   completed_phases: 0
   total_plans: 7
-  completed_plans: 1
-  percent: 14
+  completed_plans: 2
+  percent: 29
 ---
 
 # Project State
@@ -28,12 +28,12 @@ no server, no password leaks.
 ## Current Position
 
 Phase: 1 (Stabilize Video Pipeline) — EXECUTING
-Plan: 2 of 7
+Plan: 3 of 7
 Status: Ready to execute
 Last activity: 2026-05-15
 REQUIREMENTS.md, ROADMAP.md, STATE.md written)
 
-Progress: [█░░░░░░░░░] 14%
+Progress: [███░░░░░░░] 29%
 
 ## Performance Metrics
 
@@ -60,6 +60,7 @@ Progress: [█░░░░░░░░░] 14%
 
 *Updated after each plan completion*
 | Phase 01 P01 | 4min | 6 tasks | 6 files |
+| Phase 01 P02 | 4min | 5 tasks | 8 files |
 
 ## Accumulated Context
 
@@ -80,6 +81,9 @@ current work:
 
 - [Phase ?]: Doc cascade: amendments append (do not replace) original DEC/CON blocks to preserve SPEC provenance — Established convention for future SPEC-amending phases; downstream readers see both old + new with citation
 - [Phase ?]: Manifest: drop alarms permission entirely rather than retain for re-use — Plan 05 deletes the alarms code path; declaring unused permissions expands attack surface (T-1-02)
+- [Phase ?]: Pinned vitest at ^4 (4.1.6 latest stable; 5.x still beta on 2026-05-15)
+- [Phase ?]: Phase 1 Wave-0 test infra: 4 RED tests committed against not-yet-existent src/offscreen/recorder.ts — pins contracts for Plans 03+04
+- [Phase ?]: Reverted premature REQ-video-ring-buffer Complete marking left by Plan 01-01; satisfied by Plans 03+04+07, not by Wave-0 RED tests
 
 ### Pending Todos
 
@@ -102,7 +106,7 @@ Items acknowledged and carried forward from previous milestone close:
 
 ## Session Continuity
 
-Last session: 2026-05-15T15:19:25.886Z
-Stopped at: Completed 01-01 doc cascade — Plan 01-02 next
+Last session: 2026-05-15T15:27:57.027Z
+Stopped at: Plan 01-03 next (offscreen recorder TDD — flip ring-buffer + codec-check RED -> GREEN)
 intel synthesis. Coverage validated: 11/11 v1 REQs mapped.
-Resume file: .planning/phases/01-stabilize-video-pipeline/01-02-PLAN.md
+Resume file: .planning/phases/01-stabilize-video-pipeline/01-03-PLAN.md