chore(desktop): Tauri 命令 @reserved 全量标注 — 88个无前端调用命令已标注

- 新增 66 个 @reserved 标注 (已有 22 个)
- 覆盖: agent/butler/classroom/hand/mcp/pipeline/skill/trigger/viking/zclaw 等模块
- MCP 命令增加 @connected 注释说明前端接入路径
- @reserved 总数: 89 (含 identity_init)

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

@@ -112,6 +112,7 @@ impl From<zclaw_hands::HandResult> for HandResult {
 ///
 /// Returns hands from the Kernel's HandRegistry.
 /// Hands are registered during kernel initialization.
+// @reserved: Hand autonomous capabilities
 // @connected
 #[tauri::command]
 pub async fn hand_list(
@@ -142,6 +143,7 @@ pub async fn hand_list(
 /// Executes a hand with the given ID and input.
 /// If the hand has `needs_approval = true`, creates a pending approval instead.
 /// Returns the hand result as JSON, or a pending status with approval ID.
+// @reserved: Hand autonomous capabilities
 // @connected
 #[tauri::command]
 pub async fn hand_execute(
@@ -209,6 +211,7 @@ pub async fn hand_execute(
 /// When approved, the kernel's `respond_to_approval` internally spawns the Hand
 /// execution.  We additionally emit Tauri events so the frontend can track when
 /// the execution finishes.
+// @reserved: Hand approval workflow
 // @connected
 #[tauri::command]
 pub async fn hand_approve(