docs(state): record phase 19 context session

.planning/STATE.md

@@ -3,8 +3,8 @@ gsd_state_version: 1.0
 milestone: v1.1
 milestone_name: Operability & Polish
 status: "Phase 12 shipped — PR #22"
-stopped_at: Completed 12-06-PLAN.md (UAT gaps 2+3 closed)
-last_updated: "2026-06-16T20:24:41.714Z"
+stopped_at: Phase 19 context gathered
+last_updated: "2026-06-17T01:04:57.699Z"
 last_activity: 2026-06-16
 progress:
   total_phases: 24
@@ -268,9 +268,9 @@ Recent decisions affecting current work:
 
 ## Session Continuity
 
-Last session: 2026-06-16T01:15:09.630Z
-Stopped at: Completed 12-06-PLAN.md (UAT gaps 2+3 closed)
-Resume file: None
+Last session: 2026-06-17T01:04:57.686Z
+Stopped at: Phase 19 context gathered
+Resume file: .planning/phases/19-local-auth-no-oidc-mode/19-CONTEXT.md
 
 ## Operator Next Steps