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-kernel/src/kernel/evolution_bridge.rs

@@ -13,7 +13,7 @@ use zclaw_types::SkillId;
 /// Safety invariants:
 /// - `mode` is always `PromptOnly` (auto-generated skills cannot execute code)
 /// - `enabled` is `false` (requires one explicit positive feedback to activate)
-/// - `body_markdown` becomes the SKILL.md body content (stored by serialize_skill_md)
+/// - `body_markdown` is stored in `manifest.body` and persisted by `serialize_skill_md`
 pub fn candidate_to_manifest(candidate: &SkillCandidate) -> SkillManifest {
     let slug = name_to_slug(&candidate.name);
 
@@ -32,6 +32,7 @@ pub fn candidate_to_manifest(candidate: &SkillCandidate) -> SkillManifest {
         triggers: candidate.triggers.clone(),
         tools: candidate.tools.clone(),
         enabled: false,
+        body: Some(candidate.body_markdown.clone()),
     }
 }
 
@@ -48,7 +49,13 @@ fn name_to_slug(name: &str) -> String {
             result.push_str(&format!("{:x}", c as u32));
         }
     }
-    result.trim_matches('-').to_string()
+    let slug = result.trim_matches('-').to_string();
+    if slug.is_empty() {
+        // Fallback for empty or whitespace-only names
+        format!("skill-{}", &uuid::Uuid::new_v4().to_string()[..8])
+    } else {
+        slug
+    }
 }
 
 #[cfg(test)]

crates/zclaw-kernel/src/kernel/mod.rs

@@ -324,6 +324,9 @@ impl Kernel {
             if let Some(ref driver) = self.extraction_driver {
                 growth_for_compaction = growth_for_compaction.with_llm_driver(driver.clone());
             }
+            if let Some(ref embed_client) = self.embedding_client {
+                growth_for_compaction.configure_embedding(embed_client.clone());
+            }
             let mw = zclaw_runtime::middleware::compaction::CompactionMiddleware::new(
                 threshold,
                 zclaw_runtime::CompactionConfig::default(),