docs(state): record phase 15 context session

.planning/STATE.md

@@ -3,8 +3,8 @@ gsd_state_version: 1.0
 milestone: v1.4
 milestone_name: Zhihu Anti-Crawler
 status: executing
-stopped_at: Completed 14-05 integrate cache and configuration toggle
-last_updated: "2026-03-23T14:45:05.042Z"
+stopped_at: Phase 15 context gathered
+last_updated: "2026-03-23T14:48:53.206Z"
 last_activity: 2026-03-23 — Phase 14 Plan 04 completed (long text chunking)
 progress:
   total_phases: 15
@@ -157,9 +157,9 @@ None.
 
 ## Session Continuity
 
-Last session: 2026-03-23T23:00:00.000Z
-Stopped at: Completed 14-05 integrate cache and configuration toggle
-Resume file: None
+Last session: 2026-03-23T14:48:53.204Z
+Stopped at: Phase 15 context gathered
+Resume file: .planning/phases/15-output-compat/15-CONTEXT.md
 
 **Next step:** Phase 14 Plan 04 (分块处理) may need completion, or continue to Phase 15 (优化)