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/REQUIREMENTS.md

@@ -28,9 +28,9 @@
 
 ### 主题标题生成 (TITLE)
 
-- [ ] **TITLE-01**: 系统能为主题/章节类型的分段生成描述性标题
-- [ ] **TITLE-02**: 标题简洁准确，反映分段的主要内容
-- [ ] **TITLE-03**: 论点/观点类型的分段只分段，不加标题
+- [x] **TITLE-01**: 系统能为主题/章节类型的分段生成描述性标题
+- [x] **TITLE-02**: 标题简洁准确，反映分段的主要内容
+- [x] **TITLE-03**: 论点/观点类型的分段只分段，不加标题
 
 ### 中文句边界检测 (SENT)
 
@@ -106,9 +106,9 @@
 | COMP-01 | Phase 13 | Pending |
 | COMP-02 | Phase 13 | Pending |
 | COMP-03 | Phase 13 | Pending |
-| TITLE-01 | Phase 13 | Pending |
-| TITLE-02 | Phase 13 | Pending |
-| TITLE-03 | Phase 13 | Pending |
+| TITLE-01 | Phase 13 | Complete |
+| TITLE-02 | Phase 13 | Complete |
+| TITLE-03 | Phase 13 | Complete |
 | SENT-01 | Phase 13 | Pending |
 | SENT-02 | Phase 13 | Pending |
 | SENT-03 | Phase 13 | Pending |

.planning/ROADMAP.md

@@ -219,7 +219,7 @@ Phases execute in numeric order: 1 → 2 → ... → 12 → 13 → 14 → 15
 | 10. Proxy Pool | v1.3 | 2/2 | Complete | 2026-03-18 |
 | 11. Stealth Fingerprinting | v1.4 | 2/2 | Complete | 2026-03-18 |
 | 12. SRT 简化处理器 | v1.5 | 2/2 | Complete | 2026-03-21 |
-| 13. 核心 LLM 分段功能 | v1.6 | 0/7 | Planning | - |
+| 13. 核心 LLM 分段功能 | 1/7 | In Progress|  | - |
 | 14. 鲁棒性与成本控制 | v1.6 | 0/0 | Not started | - |
 | 15. 输出优化与兼容性 | v1.6 | 0/0 | Not started | - |
 

.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
 

.planning/phases/13-llm/13-04-SUMMARY.md

@@ -0,0 +1,101 @@
+---
+phase: 13-llm
+plan: 04
+subsystem: llm
+tags: [pydantic, llm, semantic-segmentation, title-generation]
+
+# Dependency graph
+requires: []
+provides:
+  - VideoSegment.title 字段和验证器
+  - SEGMENTATION_PROMPT 标题生成指令
+  - 标题生成测试套件
+affects: [13-06, 13-07]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns: [pydantic-field-validator, optional-string-validation]
+
+key-files:
+  created:
+    - kb_workflow/srt/semantic_engine.py
+    - tests/test_semantic_engine.py
+  modified: []
+
+key-decisions:
+  - "标题验证：使用 Pydantic @field_validator 验证标题长度不超过 15 字"
+  - "标题生成：LLM 自主判断是否需要标题，Prompt 中给出明确指导"
+  - "标题格式：简洁描述型（5-15字），如「机器学习概述」"
+
+patterns-established:
+  - "Pattern 1: Pydantic @field_validator 用于字段级别验证"
+  - "Pattern 2: Optional[str] 字段允许 null 值"
+
+requirements-completed: [TITLE-01, TITLE-02, TITLE-03]
+
+# Metrics
+duration: 15min
+completed: 2026-03-22
+---
+
+# Phase 13: Plan 04 - 主题标题生成 Summary
+
+**使用 Pydantic @field_validator 实现 VideoSegment.title 字段验证（不超过 15 字），Prompt 中添加标题生成指令让 LLM 自主判断是否需要标题**
+
+## Performance
+
+- **Duration:** 15 min
+- **Started:** 2026-03-21T16:22:59Z
+- **Completed:** 2026-03-21T16:37:00Z
+- **Tasks:** 1
+- **Files modified:** 2
+
+## Accomplishments
+
+- VideoSegment.title 字段定义为 Optional[str]，支持有标题和无标题分段
+- @field_validator 验证标题长度不超过 15 字，超过时抛出 ValueError
+- SEGMENTATION_PROMPT 包含标题生成指令（第 6 点和输出格式说明）
+- 测试验证标题生成、标题省略、标题长度验证
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: 实现标题生成功能** - `8c2b3e0` (feat)
+
+**Plan metadata:** (pending final commit)
+
+## Files Created/Modified
+
+- `kb_workflow/srt/semantic_engine.py` - 语义分段引擎模块，包含 VideoSegment 和 SegmentationResult Pydantic 模型，标题长度验证器
+- `tests/test_semantic_engine.py` - 测试套件，包含标题生成和验证测试
+
+## Decisions Made
+
+- 标题验证：使用 Pydantic @field_validator 在字段级别验证标题长度
+- 标题生成策略：LLM 自主判断，Prompt 中明确"主题/章节类型生成标题，论点/观点类型不加标题"
+- 标题长度限制：不超过 15 字，验证器中提供清晰的错误消息
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+- **测试数据问题**：创建 15 字测试字符串时遇到汉字计数问题，通过使用简单数字汉字解决（"一二三四五六七八九十十一二十三"）
+- **start_index 约束**：现有 VideoSegment 模型中 start_index 有 `ge=1` 约束，测试中需要使用 start_index=1 而非 0
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+
+- 标题生成功能已完成，可被后续计划使用
+- Pydantic 模型和验证器已建立，可扩展用于其他字段验证
+- 测试框架已就绪，可添加更多测试场景
+
+---
+*Phase: 13-llm, Plan: 04*
+*Completed: 2026-03-22*