docs(state): record phase 13 context session

.planning/STATE.md

@@ -2,13 +2,10 @@
 gsd_state_version: 1.0
 milestone: v0.3
 milestone_name: Reimagining Cloud Storage integration
-current_phase: 12.1
-current_phase_name: fix-nextcloud-root-listing-and-sync-visibility
 status: verifying
-stopped_at: Completed Phase 12.1 Plan 03 — normalized cloud browser contract
-last_updated: "2026-06-22T07:48:17.177Z"
-last_activity: 2026-06-22
-last_activity_desc: Phase 12.1 execution started
+stopped_at: Phase 13 context gathered
+last_updated: "2026-06-22T13:46:10.010Z"
+last_activity: 2026-06-22 — Phase 12.1 execution started
 progress:
   total_phases: 6
   completed_phases: 2
@@ -90,7 +87,7 @@ None.
 
 ## Session Continuity
 
-**Stopped at:** Completed Phase 12.1 Plan 02 — truthful freshness gate
+**Stopped at:** Phase 13 context gathered
 
 _Updated at each phase transition._