docs(01): record Phase 1 planning complete (7 plans, 7 waves)

After gsd-plan-phase 1: 7 plans across 7 waves. All gates pass:
- Plan-checker (sonnet) VERIFICATION PASSED on iteration 1
- Decision coverage gate (gsd-sdk): 19/19 decisions covered
- Requirements coverage: REQ-video-ring-buffer in all plans
- Security threat model: T-1-01/02/04 mitigated; T-1-03 accepted residual

Known non-blocking gaps:
- gsd-sdk roadmap.annotate-dependencies failed (t.trim is not a function);
  ROADMAP plan-list annotations skipped. Phase 1 plan-list in ROADMAP.md
  remains accurate; this is a cosmetic nice-to-have for cross-cutting
  constraint visibility.
- 1 plan-checker warning (stale wave prose in Plan 03/04 objectives) was
  fixed during decision-coverage revision.

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

.planning/STATE.md

@@ -2,14 +2,14 @@
 gsd_state_version: 1.0
 milestone: v2.0.0
 milestone_name: milestone
-status: planning
+status: executing
 stopped_at: Phase 1 context gathered
-last_updated: "2026-05-15T13:40:45.486Z"
-last_activity: 2026-05-15 — bootstrap from intel synthesis (PROJECT.md,
+last_updated: "2026-05-15T15:08:45.135Z"
+last_activity: 2026-05-15 -- Phase 1 planning complete
 progress:
   total_phases: 5
   completed_phases: 0
-  total_plans: 0
+  total_plans: 7
   completed_plans: 0
   percent: 0
 ---
@@ -29,8 +29,8 @@ no server, no password leaks.
 
 Phase: 1 of 5 (Stabilize video pipeline)
 Plan: 0 of TBD in current phase
-Status: Ready to plan
-Last activity: 2026-05-15 — bootstrap from intel synthesis (PROJECT.md,
+Status: Ready to execute
+Last activity: 2026-05-15 -- Phase 1 planning complete
 REQUIREMENTS.md, ROADMAP.md, STATE.md written)
 
 Progress: [░░░░░░░░░░] 0%