docs(02-02): complete bilibili adapter plan

- Create 02-02-SUMMARY.md with execution results
- Update STATE.md with decisions and session info
- Update ROADMAP.md with plan progress

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

.planning/STATE.md

@@ -4,8 +4,8 @@ milestone: v1.0
 milestone_name: milestone
 current_plan: 3
 status: executing
-stopped_at: Completed 02-03-PLAN.md
-last_updated: "2026-03-13T10:27:09.681Z"
+stopped_at: Completed 02-02-PLAN.md
+last_updated: "2026-03-13T10:27:20.106Z"
 last_activity: 2026-03-13
 progress:
   total_phases: 4
@@ -81,6 +81,9 @@ Recent decisions affecting current work:
 - [Phase 02-platform-skills]: 无法识别的 URL 返回 None 而不是抛异常，便于调用方处理
 - [Phase 02-platform-skills]: Lazy import of kb_zhihu_metadata to avoid dependency issues
 - [Phase 02-platform-skills]: Login page detection via title keywords and content length threshold
+- [Phase 02]: State recording only after all retries exhausted (not on each retry attempt)
+- [Phase 02]: Video content returns empty string (handled by ASR in Phase 3)
+- [Phase 02]: Article content fetching as placeholder (requires additional API implementation)
 
 ### Pending Todos
 
@@ -96,6 +99,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-03-13T10:26:42.175Z
-Stopped at: Completed 02-03-PLAN.md
+Last session: 2026-03-13T10:27:20.104Z
+Stopped at: Completed 02-02-PLAN.md
 Resume file: None