fix(growth,kernel,runtime): 穷尽审计后 7 项修复 — body 持久化 + embedding 死路径 + 安全加固

CRITICAL 修复:
- body_markdown 数据丢失: SkillManifest.body 字段 + serialize_skill_md 使用 body 替代默认内容
- embedding 检索死路径: rerank_entries 使用异步 index_entry_with_embedding + score_similarity_with_embedding (70/30 混合)
- try_write 静默丢失: pending_embedding 字段 + apply_pending_embedding() 延迟应用

IMPORTANT 修复:
- auto_mode 内存泄漏: add_pending 容量限制 100 + 溢出时丢弃最旧
- name_to_slug 空 ID: uuid fallback for empty/whitespace-only names
- compaction embedding 缺失: compaction GrowthIntegration 也接收 embedding
- kernel 未初始化警告: viking_configure_embedding warn log

验证: 934+ tests PASS, 0 failures

crates/zclaw-runtime/src/middleware/evolution.rs

@@ -50,7 +50,14 @@ impl EvolutionMiddleware {
 
     /// 添加一个待确认的进化事件
     pub async fn add_pending(&self, evolution: PendingEvolution) {
-        self.pending.write().await.push(evolution);
+        let mut pending = self.pending.write().await;
+        if pending.len() >= 100 {
+            tracing::warn!(
+                "[EvolutionMiddleware] Pending queue full (100), dropping oldest event"
+            );
+            pending.remove(0);
+        }
+        pending.push(evolution);
     }
 
     /// 获取并清除所有待确认事件