docs(13-04): complete plan summary and state updates

- Create 13-04-SUMMARY.md with execution details
- Update STATE.md with position and performance metrics
- Update ROADMAP.md with plan progress (1/7 complete)
- Mark TITLE-01, TITLE-02, TITLE-03 requirements complete

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

.planning/STATE.md

@@ -2,16 +2,16 @@
 gsd_state_version: 1.0
 milestone: v1.6
 milestone_name: 语义分段改进
-status: ready_to_execute
-stopped_at: Phase 13 planning complete
-last_updated: "2026-03-22T10:00:00.000Z"
-last_activity: 2026-03-22 — Phase 13 plan created (7 plans)
+status: executing
+stopped_at: Completed Phase 13 Plan 04
+last_updated: "2026-03-22T10:05:00.000Z"
+last_activity: 2026-03-22 — Completed Phase 13 Plan 04 (主题标题生成)
 progress:
   total_phases: 15
   completed_phases: 12
   total_plans: 38
-  completed_plans: 30
-  percent: 79
+  completed_plans: 31
+  percent: 82
 ---
 
 # Project State
@@ -108,13 +108,19 @@ Extract Paragraphs → ASR Correction → Generate Markdown
 
 None.
 
+## Performance Metrics
+
+| Phase | Plan | Duration | Tasks | Files | Date |
+|-------|------|----------|-------|-------|------|
+| 13 | 04 | 140s (2min) | 1 | 2 | 2026-03-22 |
+
 ## Session Continuity
 
 Last session: 2026-03-22T10:00:00.000Z
-Stopped at: Phase 13 planning complete
-Resume file: .planning/phases/13-llm/13-CONTEXT.md
+Stopped at: Completed Phase 13 Plan 04 - 主题标题生成
+Resume file: .planning/phases/13-llm/13-04-SUMMARY.md
 
-**Next step:** `/gsd:execute-phase 13` - 开始执行 Phase 13 的 7 个计划
+**Next step:** Continue with Phase 13 remaining plans (01-03, 05-07)
 
 ## Phase 13 Plan Structure