fix(tauri): @reserved annotations for 16 unconnected commands

Complete Tauri command audit: 177 total (160 @connected + 16 @reserved + 1 unregistered identity_init)
Corrected zclaw_doctor from @connected to @reserved

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

@@ -231,8 +231,8 @@ pub async fn agent_update(
         .ok_or_else(|| format!("Agent not found after update: {}", agent_id))
 }
 
+/// @reserved — no frontend UI yet
 /// Export an agent configuration as JSON
-// @reserved: 暂无前端集成
 #[tauri::command]
 pub async fn agent_export(
     state: State<'_, KernelState>,
@@ -254,8 +254,8 @@ pub async fn agent_export(
         .map_err(|e| format!("Failed to serialize agent config: {}", e))
 }
 
+/// @reserved — no frontend UI yet
 /// Import an agent from JSON configuration
-// @reserved: 暂无前端集成
 #[tauri::command]
 pub async fn agent_import(
     state: State<'_, KernelState>,