fix(wechat): route scheduled task cancel and spec updates through Goose MCP

Pass cancel requests to Goose like create instead of inbound title matching,
and add scheduled_task_update_spec so format or execution constraints update
taskSpec without triggering page delivery guards.

Co-authored-by: Cursor <cursoragent@cursor.com>

capabilities.mjs

@@ -469,6 +469,7 @@ export function sandboxMcpTools(capabilities) {
       'scheduled_task_create',
       'scheduled_task_list',
       'scheduled_task_cancel',
+      'scheduled_task_update_spec',
     );
   }
   return tools;