docs(15): record planning complete + roadmap wave annotations

.planning/STATE.md

@@ -4,8 +4,8 @@ milestone: v1.1
 milestone_name: Operability & Polish
 status: executing
 stopped_at: Phase 14 context gathered
-last_updated: "2026-06-12T13:10:04.656Z"
-last_activity: 2026-06-12
+last_updated: "2026-06-12T14:30:50.407Z"
+last_activity: 2026-06-12 -- Phase 15 planning complete
 progress:
   total_phases: 18
   completed_phases: 4
@@ -27,8 +27,8 @@ See: .planning/PROJECT.md (updated 2026-06-10)
 
 Phase: 999.1
 Plan: Not started
-Status: Executing Phase 14
-Last activity: 2026-06-12
+Status: Ready to execute
+Last activity: 2026-06-12 -- Phase 15 planning complete
 
 ## Performance Metrics