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-kernel/src/kernel/mod.rs

@@ -252,6 +252,12 @@ impl Kernel {
             growth = growth.with_llm_driver(driver.clone());
         }
 
+        // Evolution middleware — shared with MemoryMiddleware for pushing evolution candidates
+        let evolution_mw = std::sync::Arc::new(
+            zclaw_runtime::middleware::evolution::EvolutionMiddleware::new()
+        );
+        chain.register(evolution_mw.clone());
+
         // Compaction middleware — only register when threshold > 0
         let threshold = self.config.compaction_threshold();
         if threshold > 0 {
@@ -269,10 +275,11 @@ impl Kernel {
             chain.register(Arc::new(mw));
         }
 
-        // Memory middleware — auto-extract memories after conversations
+        // Memory middleware — auto-extract memories + check evolution after conversations
         {
             use std::sync::Arc;
-            let mw = zclaw_runtime::middleware::memory::MemoryMiddleware::new(growth);
+            let mw = zclaw_runtime::middleware::memory::MemoryMiddleware::new(growth)
+                .with_evolution(evolution_mw);
             chain.register(Arc::new(mw));
         }