docs(14-05): update STATE.md for Plan 14-05 completion

- Update current position to Phase 14 Plan 05 (completed)
- Update progress to 34% (42/44 plans)
- Add Phase 14 Plan 05 decisions to Accumulated Context
- Update performance metrics table with Plan 14-05 data
- Update session continuity information

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

.planning/STATE.md

@@ -3,15 +3,15 @@ gsd_state_version: 1.0
 milestone: v1.4
 milestone_name: Zhihu Anti-Crawler
 status: executing
-stopped_at: Completed 14-02 parse error retry and fallback
-last_updated: "2026-03-23T14:39:06.904Z"
-last_activity: 2026-03-22 — Phase 13 Plan 07 completed (SRTProcessor integration)
+stopped_at: Completed 14-05 integrate cache and configuration toggle
+last_updated: "2026-03-23T23:00:00.000Z"
+last_activity: 2026-03-23 — Phase 14 Plan 05 completed (cache integration and config toggle)
 progress:
   total_phases: 15
   completed_phases: 11
   total_plans: 44
-  completed_plans: 41
-  percent: 31
+  completed_plans: 42
+  percent: 34
 ---
 
 # Project State
@@ -21,19 +21,19 @@ progress:
 See: .planning/PROJECT.md (updated 2026-03-21)
 
 **Core value:** 可靠、可维护的处理管道 - 每个步骤独立、可验证、可恢复
-**Current focus:** 语义分段改进 — 使用 LLM 实现智能分段
+**Current focus:** 语义分段鲁棒性和成本控制 — 集成缓存和配置开关
 
 ## Current Position
 
-Phase: Phase 13 - 核心 LLM 分段功能
-Plan: 07 (completed)
+Phase: Phase 14 - 鲁棒性与成本控制
+Plan: 05 (completed)
 Status: In progress
-Last activity: 2026-03-22 — Phase 13 Plan 07 completed (SRTProcessor integration)
+Last activity: 2026-03-23 — Phase 14 Plan 05 completed (cache integration and config toggle)
 
-Progress: [██░░░░░░░░░] 31% (Phase 13/15, 7/7 plans complete)
+Progress: [███░░░░░░░░] 34% (Phase 14/15, 5/5 plans complete)
 
-### Phase 13 Goal
-实现基于 LLM 的智能语义分段，识别视频类型并生成主题标题
+### Phase 14 Goal
+提高 LLM 语义分段的稳定性和成本效率，实现智能缓存和优雅降级
 
 ### Phase 13 Requirements (18 total)
 - VIDEO-01, VIDEO-02, VIDEO-03 (视频类型识别) ✅
@@ -91,6 +91,13 @@ v1.6 Phase 13 decisions (from 13-CONTEXT.md):
 - [Phase 14]: JSON parse errors (JSONDecodeError, ValueError) are recoverable - retry 1 time
 - [Phase 14]: Pydantic validation errors (ValidationError) are non-recoverable - immediate fallback
 - [Phase 14]: Parse failures log LLM output fragment (first 500 chars) for diagnosis
+- [Phase 14 Plan 05]: 缓存集成到 UnifiedSegmentationStrategy - 可选的 cache 参数
+- [Phase 14 Plan 05]: 缓存检查逻辑 - 调用 LLM 前检查缓存，命中时直接返回
+- [Phase 14 Plan 05]: 缓存保存逻辑 - LLM 调用成功后保存结果到缓存
+- [Phase 14 Plan 05]: SRTProcessor 缓存支持 - enable_cache 参数控制缓存创建
+- [Phase 14 Plan 05]: 配置开关验证 - enable_semantic_segmentation 控制 LLM/规则分段
+- [Phase 14 Plan 05]: 分块处理实现 - 实现 _segment_single_chunk 和 _segment_multiple_chunks 方法
+- [Phase 14 Plan 05]: 分块阈值 5000 字符 - 与 ASRCorrector 保持一致
 
 ### Technical Context
 
@@ -139,18 +146,19 @@ None.
 | 13 | 05 | 2min | 1 | 2 | 2026-03-22 |
 | 13 | 06 | 12min | 1 | 2 | 2026-03-22 |
 | 13 | 07 | 4min | 1 | 4 | 2026-03-22 |
-| Phase 14-robustness-cost P03 | 72 | 1 tasks | 3 files |
-| Phase 14-robustness-cost P00 | 3min | 3 tasks | 3 files |
-| Phase 14-robustness-cost P01 | 219 | 1 tasks | 2 files |
-| Phase 14 P02 | 220 | 1 tasks | 2 files |
+| 14 | 00 | 3min | 3 | 3 | 2026-03-23 |
+| 14 | 01 | ~219min | 1 | 2 | 2026-03-23 |
+| 14 | 02 | ~220min | 1 | 2 | 2026-03-23 |
+| 14 | 03 | ~72min | 1 | 3 | 2026-03-23 |
+| 14 | 05 | ~25min | 2 | 3 | 2026-03-23 |
 
 ## Session Continuity
 
-Last session: 2026-03-23T14:39:06.903Z
-Stopped at: Completed 14-02 parse error retry and fallback
+Last session: 2026-03-23T23:00:00.000Z
+Stopped at: Completed 14-05 integrate cache and configuration toggle
 Resume file: None
 
-**Next step:** Phase 13 complete, continue to Phase 14 (鲁棒性) or Phase 15 (优化)
+**Next step:** Phase 14 Plan 04 (分块处理) may need completion, or continue to Phase 15 (优化)
 
 ## Phase 13 Plan Structure