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/define.md

@@ -0,0 +1,19 @@
+---
+description: Create a single, rigorous feature spec.
+---
+
+## User Input
+$ARGUMENTS
+
+## Instructions
+
+1.  **Context**: Read `memory/constitution.md` and any attached images.
+2.  **Draft Spec**:
+    * Create/Update **ONE file only**: `specs/[feature_name]/spec.md`.
+    * **Do NOT** create a checklist file.
+    * **Do NOT** create a separate analysis file.
+3.  **Content**:
+    * Include "Visual Requirements" (from images).
+    * Include "Functional Requirements".
+    * Include "Edge Cases" directly in the spec as a section.
+4.  **Output**: Show the `spec.md` artifact.