docs(09-12): record the phase 9 acceptance evidence

- Security review names the test that fails if each high control is removed.
- Validation rows now point at the phase gate commands.
- Roadmap shows 12/12 plans executed.

.planning/STATE.md

@@ -5,17 +5,17 @@ milestone_name: milestone
 current_phase: 09
 current_phase_name: Backend admin authentication and schema pipeline
 status: executing
-stopped_at: Completed 09-11-PLAN.md
-last_updated: "2026-09-26T21:07:38.633Z"
-last_activity: 2026-09-26
-last_activity_desc: Phase 09 execution continued through permissions, navigation, and singleton settings
+stopped_at: Completed 09-12-PLAN.md
+last_updated: "2026-09-27T03:05:00.000Z"
+last_activity: 2026-09-27
+last_activity_desc: Phase 09 plan 12 acceptance gate completed
 state_head: 10ca7a02e3feecd0974bbfa58902285bc9dc149f
 progress:
   total_phases: 15
   completed_phases: 8
   total_plans: 67
-  completed_plans: 66
-  percent: 99
+  completed_plans: 67
+  percent: 100
 ---
 
 # Project State
@@ -31,10 +31,10 @@ See: .planning/PROJECT.md (updated 2026-09-16)
 
 Phase: 09 (Backend admin authentication and schema pipeline) — EXECUTING
 Plan: 12 of 12
-Status: Ready to execute
-Last activity: 2026-09-26
+Status: Plan complete, verification not yet recorded
+Last activity: 2026-09-27 — Phase 09 plan 12 acceptance gate completed
 
-Progress: [██████████] 99%
+Progress: [██████████] 100%
 
 ## Performance Metrics