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

desktop/src-tauri/src/kernel_commands/skill.rs

@@ -174,8 +174,9 @@ pub async fn skill_create(
         tags: vec![],
         category: None,
         triggers: request.triggers,
-        tools: vec![], // P2-19: Include tools field
+        tools: vec![],
         enabled: request.enabled.unwrap_or(true),
+        body: None,
     };
 
     kernel.create_skill(manifest.clone())
@@ -221,8 +222,9 @@ pub async fn skill_update(
         tags: existing.tags.clone(),
         category: existing.category.clone(),
         triggers: request.triggers.unwrap_or(existing.triggers),
-        tools: existing.tools.clone(), // P2-19: Preserve tools on update
+        tools: existing.tools.clone(),
         enabled: request.enabled.unwrap_or(existing.enabled),
+        body: existing.body.clone(),
     };
 
     let result = kernel.update_skill(&SkillId::new(&id), updated)

desktop/src-tauri/src/viking_commands.rs

@@ -637,6 +637,11 @@ pub async fn viking_configure_embedding(
         if let Some(ref mut k) = *kernel_lock {
             k.set_embedding_client(arc_adapter);
             tracing::info!("[VikingCommands] Embedding propagated to Kernel skill router + memory retriever");
+        } else {
+            tracing::warn!(
+                "[VikingCommands] Kernel not initialized, embedding only applied to SqliteStorage. \
+                 It will be applied when Kernel boots."
+            );
         }
     }