fix: destructure backup_id in execute()

src/tools/SelfEvolveTool.js

@@ -71,7 +71,7 @@ export class SelfEvolveTool {
   }
 
   execute(args) {
-    const { action, file, old_code, new_code, message } = args;
+    const { action, file, old_code, new_code, message, backup_id } = args;
 
     switch (action) {
       case 'read': return this.readFile(file);