fix(growth): HIGH-3 FeedbackCollector 信任度持久化

根因: FeedbackCollector 用纯内存 HashMap 存储信任度记录，重启后归零。

修复:
- FeedbackCollector 添加 viking: Option<Arc<VikingAdapter>> 字段
- 添加 with_viking() 构造器
- 添加 save(): 遍历 trust_records → MemoryEntry → VikingAdapter 存储
- 添加 load(): find_by_prefix 反序列化回 HashMap
- EvolutionEngine::new()/from_experience_store() 传入 VikingAdapter
- submit_feedback() 改为 async，提交后自动调用 save()
- 添加 load_feedback() 供启动时恢复

测试: save_and_load_roundtrip + load_without_viking + save_without_viking

crates/zclaw-growth/src/feedback_collector.rs

@@ -1,12 +1,17 @@
 //! 反馈信号收集与信任度管理（Phase 5 反馈闭环）
 //! 收集用户对进化产物（技能/Pipeline）的显式/隐式反馈
 //! 管理信任度衰减和优化循环
+//! 信任度记录通过 VikingAdapter 持久化
 
 use std::collections::HashMap;
+use std::sync::Arc;
 
 use chrono::{DateTime, Utc};
 use serde::{Deserialize, Serialize};
 
+use crate::types::MemoryType;
+use crate::viking_adapter::VikingAdapter;
+
 /// 反馈信号类型
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub enum FeedbackSignal {
@@ -60,18 +65,105 @@ pub struct TrustRecord {
 
 /// 反馈收集器
 /// 管理反馈记录和信任度评分
-/// 内存存储，可持久化到 SQLite（后续版本）
+/// 通过 VikingAdapter 持久化信任度记录（可选）
 pub struct FeedbackCollector {
     trust_records: HashMap<String, TrustRecord>,
+    viking: Option<Arc<VikingAdapter>>,
 }
 
 impl FeedbackCollector {
     pub fn new() -> Self {
         Self {
             trust_records: HashMap::new(),
+            viking: None,
         }
     }
 
+    /// 创建带 VikingAdapter 的 FeedbackCollector
+    pub fn with_viking(viking: Arc<VikingAdapter>) -> Self {
+        Self {
+            trust_records: HashMap::new(),
+            viking: Some(viking),
+        }
+    }
+
+    /// 从 VikingAdapter 加载已持久化的信任度记录
+    pub async fn load(&mut self) -> Result<usize, String> {
+        let viking = match &self.viking {
+            Some(v) => v,
+            None => return Ok(0),
+        };
+
+        // MemoryEntry::new("feedback", Session, artifact_id) 生成
+        // URI: agent://feedback/sessions/{artifact_id}
+        let entries = viking
+            .find_by_prefix("agent://feedback/sessions/")
+            .await
+            .map_err(|e| format!("Failed to load trust records: {}", e))?;
+
+        let mut count = 0;
+        for entry in entries {
+            match serde_json::from_str::<TrustRecord>(&entry.content) {
+                Ok(record) => {
+                    self.trust_records
+                        .insert(record.artifact_id.clone(), record);
+                    count += 1;
+                }
+                Err(e) => {
+                    tracing::warn!(
+                        "[FeedbackCollector] Failed to deserialize trust record at {}: {}",
+                        entry.uri,
+                        e
+                    );
+                }
+            }
+        }
+
+        tracing::debug!(
+            "[FeedbackCollector] Loaded {} trust records from storage",
+            count
+        );
+        Ok(count)
+    }
+
+    /// 将信任度记录持久化到 VikingAdapter
+    pub async fn save(&self) -> Result<usize, String> {
+        let viking = match &self.viking {
+            Some(v) => v,
+            None => return Ok(0),
+        };
+
+        let mut saved = 0;
+        for record in self.trust_records.values() {
+            let content =
+                serde_json::to_string(record).unwrap_or_default();
+            let entry = crate::types::MemoryEntry::new(
+                "feedback",
+                MemoryType::Session,
+                &record.artifact_id,
+                content,
+            )
+            .with_importance((record.trust_score * 10.0) as u8);
+
+            match viking.store(&entry).await {
+                Ok(_) => saved += 1,
+                Err(e) => {
+                    tracing::warn!(
+                        "[FeedbackCollector] Failed to save trust record {}: {}",
+                        record.artifact_id,
+                        e
+                    );
+                }
+            }
+        }
+
+        tracing::debug!(
+            "[FeedbackCollector] Saved {} trust records to storage",
+            saved
+        );
+        Ok(saved)
+    }
+
     /// 提交一条反馈
     pub fn submit_feedback(&mut self, entry: FeedbackEntry) -> TrustUpdate {
         let record = self
@@ -281,4 +373,44 @@ mod tests {
         let recommended = collector.get_recommended_artifacts();
         assert_eq!(recommended.len(), 1);
     }
+
+    #[tokio::test]
+    async fn test_save_and_load_roundtrip() {
+        let viking = Arc::new(crate::VikingAdapter::in_memory());
+
+        // 写入阶段
+        let mut collector = FeedbackCollector::with_viking(viking.clone());
+        collector.submit_feedback(make_feedback("skill-a", Sentiment::Positive));
+        collector.submit_feedback(make_feedback("skill-a", Sentiment::Positive));
+        collector.submit_feedback(make_feedback("skill-b", Sentiment::Negative));
+
+        let saved = collector.save().await.unwrap();
+        assert_eq!(saved, 2); // 2 个 artifact
+
+        // 读取阶段：新 collector 从存储加载
+        let mut collector2 = FeedbackCollector::with_viking(viking);
+        let loaded = collector2.load().await.unwrap();
+        assert_eq!(loaded, 2);
+
+        let record_a = collector2.get_trust("skill-a").unwrap();
+        assert_eq!(record_a.positive_count, 2);
+        assert_eq!(record_a.total_feedback, 2);
+
+        let record_b = collector2.get_trust("skill-b").unwrap();
+        assert_eq!(record_b.negative_count, 1);
+    }
+
+    #[tokio::test]
+    async fn test_load_without_viking_returns_zero() {
+        let mut collector = FeedbackCollector::new();
+        let loaded = collector.load().await.unwrap();
+        assert_eq!(loaded, 0);
+    }
+
+    #[tokio::test]
+    async fn test_save_without_viking_returns_zero() {
+        let collector = FeedbackCollector::new();
+        let saved = collector.save().await.unwrap();
+        assert_eq!(saved, 0);
+    }
 }