docs(state): record phase 18 context session

.planning/STATE.md

@@ -3,8 +3,8 @@ gsd_state_version: 1.0
 milestone: v1.1
 milestone_name: Operability & Polish
 status: executing
-stopped_at: Completed 11-04-PLAN.md
-last_updated: "2026-06-14T12:31:06.011Z"
+stopped_at: Phase 18 context gathered
+last_updated: "2026-06-15T01:25:46.051Z"
 last_activity: 2026-06-14
 progress:
   total_phases: 23
@@ -252,9 +252,9 @@ Recent decisions affecting current work:
 
 ## Session Continuity
 
-Last session: 2026-06-14T10:57:47.923Z
-Stopped at: Completed 11-04-PLAN.md
-Resume file: None
+Last session: 2026-06-15T01:25:46.029Z
+Stopped at: Phase 18 context gathered
+Resume file: .planning/phases/18-auto-timezone-detection-and-ability-to-change-timezone/18-CONTEXT.md
 
 ## Operator Next Steps