docs(state): record phase 5 context session

.planning/STATE.md

@@ -1,16 +1,16 @@
 ---
 gsd_state_version: 1.0
 milestone: v1.1
-milestone_name: usability-and-templates
+milestone_name: Usability and Templates
 status: planning
-stopped_at: null
-last_updated: "2026-03-12"
-last_activity: 2026-03-12 — Roadmap created for v1.1 (Phases 5-8)
+stopped_at: Phase 5 context gathered
+last_updated: "2026-03-12T10:54:48.549Z"
+last_activity: 2026-03-12 — v1.1 roadmap created, Phases 5-8 defined
 progress:
-  total_phases: 4
-  completed_phases: 0
-  total_plans: 9
-  completed_plans: 0
+  total_phases: 8
+  completed_phases: 4
+  total_plans: 10
+  completed_plans: 10
   percent: 0
 ---
 
@@ -75,6 +75,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-03-12
-Stopped at: v1.1 roadmap created — Phases 5-8 written to ROADMAP.md
-Resume file: None
+Last session: 2026-03-12T10:54:48.547Z
+Stopped at: Phase 5 context gathered
+Resume file: .planning/phases/05-template-data-model-and-api/05-CONTEXT.md