fix(prefab): 修复预制体编辑模式的保存与退出，使用原生 scene://edit-mode 接口替代无效的 IPC 广播，更新相关使用文档与安全规定

.agent/workflows/execute.md

@@ -0,0 +1,13 @@
+---
+description: Build the feature from the plan.
+---
+
+## Instructions
+
+1.  **Read**: Open `specs/[feature_name]/plan.md`.
+2.  **Execute**:
+    * Look for the **Step-by-Step** section with checkboxes.
+    * Execute the unchecked items `- [ ]`.
+3.  **Vibe Check**:
+    * After every 2-3 steps, verify the code visually.
+    * Mark steps as `- [x]` in `plan.md` as you finish them.