fix(growth): Evolution Engine 穷尽审计 3CRITICAL + 3HIGH 全部修复

C-01: ExperienceExtractor 接入 ExperienceStore
- GrowthIntegration.new() 创建 ExperienceExtractor 时注入 ExperienceStore
- 经验持久化路径打通：extract_combined → persist_experiences → ExperienceStore

C-02+C-03: 进化触发链路全链路接通
- create_middleware_chain() 注册 EvolutionMiddleware (priority 78)
- MemoryMiddleware 持有 Arc<EvolutionMiddleware> 共享引用
- after_completion 中调用 check_evolution() → 推送 PendingEvolution
- EvolutionMiddleware 在下次对话前注入进化建议到 system prompt

H-01: FeedbackCollector loaded 标志修复
- load() 失败时保留 loaded=false，下次 save 重试
- 日志级别 debug → warn

H-03: FeedbackCollector 内部可变性
- EvolutionEngine.feedback 改为 Arc<Mutex<FeedbackCollector>>
- submit_feedback() 从 &mut self → &self，支持中间件 &self 调用路径
- GrowthIntegration.initialize() 从 &mut self → &self

H-05: 删除空测试 test_parse_empty_response (无 assert)

H-06: infer_experiences_from_memories() fallback
- Outcome::Success → Outcome::Partial (反映推断不确定性)

crates/zclaw-growth/src/extractor.rs

@@ -501,7 +501,7 @@ fn infer_experiences_from_memories(
                 pain_pattern: m.category.clone(),
                 context: content.clone(),
                 solution_steps: Vec::new(),
-                outcome: crate::types::Outcome::Success,
+                outcome: crate::types::Outcome::Partial,
                 confidence: m.confidence * 0.7, // 降低推断置信度
                 tools_used: m.keywords.clone(),
                 industry_context: None,