docs(09-01): complete ZhihuAdapter integration plan

- Integrated ZhihuCrawler into ZhihuAdapter
- Added comment crawling and formatting
- Implemented cookie auto-login flow
- Added idempotent execution via IdempotencyChecker

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.planning/STATE.md

@@ -2,15 +2,15 @@
 gsd_state_version: 1.0
 milestone: v1.2
 milestone_name: Zhihu Crawler
-status: in_progress
-stopped_at: Phase 9 Plan 00 complete
-last_updated: "2026-03-17T14:59:13Z"
+status: completed
+stopped_at: Completed 09-01 ZhihuAdapter integration
+last_updated: "2026-03-17T15:16:21.491Z"
 last_activity: 2026-03-17 — Phase 09-00 Test scaffolding complete
 progress:
   total_phases: 9
   completed_phases: 8
-  total_plans: 25
-  completed_plans: 25
+  total_plans: 27
+  completed_plans: 26
   percent: 100
 ---
 
@@ -48,6 +48,7 @@ Progress: [██████████] 100% (v1.2 milestone - Phase 9 in pro
 | Phase 08 P02 | 5min | 2 | 3 | 2026-03-17 |
 | Phase 08 P03 | 15min | 2 | 5 | 2026-03-17 |
 | 09-00 | 2min | 1 | 1 | 2026-03-17 |
+| Phase 09-pipeline-integration P01 | 11min | 3 tasks | 2 files |
 
 ## Accumulated Context
 
@@ -78,6 +79,9 @@ v1.2 decisions:
 - [Phase 08-02]: Use Playwright request API for direct comment API calls instead of route interception
 - [Phase ?]: - [Phase 08-02]: Only fetch first-level comments (no nested replies)
 - [Phase ?]: - [Phase 08-02]: Use hot sorting (order=hot) for popular comments
+- [Phase 09-01]: ZhihuAdapter uses ZhihuCrawler with comment crawling enabled by default
+- [Phase 09-01]: Cookie expiration triggers automatic QR code login flow
+- [Phase 09-01]: Comments appended to content in Markdown format with '## 热门评论' section
 
 ### Blockers/Concerns
 
@@ -85,8 +89,8 @@ None.
 
 ## Session Continuity
 
-Last session: 2026-03-17T14:59:13Z
-Stopped at: Phase 9 Plan 00 complete
-Resume file: .planning/phases/09-pipeline-integration/09-00-SUMMARY.md
+Last session: 2026-03-17T15:16:21.489Z
+Stopped at: Completed 09-01 ZhihuAdapter integration
+Resume file: None
 
 **Next step:** Continue with Phase 09-01 ZhihuAdapter integration