Method on

packages/core/src/debug/debugController.ts:328–328

* Subscribe to debug events. * @param event - Event type: 'record' or 'error' * @param handler - Event handler * @returns Unsubscribe function

(event: "record", handler: DebugRecordHandler)

   * @returns Unsubscribe function
   */
  on(event: "record", handler: DebugRecordHandler): () => void;
  on(event: "error", handler: DebugErrorHandler): () => void;

  /* --- State --- */