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/architect.md

@@ -0,0 +1,18 @@
+---
+description: Create a unified implementation plan.
+---
+
+## User Input
+$ARGUMENTS
+
+## Instructions
+
+1.  **Read**: Load the `spec.md` provided by the user.
+2.  **Draft Plan**:
+    * Create/Update **ONE file**: `specs/[feature_name]/plan.md`.
+    * **Section 1: Architecture**: Briefly list changed files and data models.
+    * **Section 2: Step-by-Step**: List the implementation steps (Todo list) directly in this file.
+3.  **Format**:
+    * Use checkboxes `- [ ]` for the steps so they are clickable.
+    * Mark steps as `[Frontend]` or `[Backend]`.
+4.  **Constraint**: Do NOT create `tasks.md`. Keep it all in `plan.md`.