docs(14-02): complete parse error retry and fallback plan

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.4
 milestone_name: Zhihu Anti-Crawler
 status: executing
-stopped_at: Completed 14-01-PLAN.md (LLM 调用优雅降级策略)
-last_updated: "2026-03-23T14:38:58.429Z"
+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)
 progress:
   total_phases: 15
   completed_phases: 11
   total_plans: 44
-  completed_plans: 40
+  completed_plans: 41
   percent: 31
 ---
 
@@ -87,6 +87,10 @@ v1.6 Phase 13 decisions (from 13-CONTEXT.md):
 - [Phase 14-robustness-cost]: 缓存键使用 SHA256 内容哈希，确保相同内容精确匹配
 - [Phase 14-robustness-cost]: 缓存文件包含 version 字段（1.0），支持未来格式变更
 - [Phase 14-robustness-cost]: 缓存失败时返回 None，不中断主流程（错误容错）
+- [Phase 14]: ValidationError checked before ValueError (inherits from ValueError)
+- [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
 
 ### Technical Context
 
@@ -138,11 +142,12 @@ None.
 | 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 |
 
 ## Session Continuity
 
-Last session: 2026-03-23T14:38:58.427Z
-Stopped at: Completed 14-01-PLAN.md (LLM 调用优雅降级策略)
+Last session: 2026-03-23T14:39:06.903Z
+Stopped at: Completed 14-02 parse error retry and fallback
 Resume file: None
 
 **Next step:** Phase 13 complete, continue to Phase 14 (鲁棒性) or Phase 15 (优化)