import type { NotebookExecutionRecovery } from './execution-recovery' // A failed stop is an execution-integrity failure, not an ordinary user-code error or cancellation.// Keep its identity across in-process Notebook, ACP, and Task boundaries; never persist the instance.export class NotebookExecutionStopError extends Error {  readonly recovery?: NotebookExecutionRecovery   constructor(    message = 'Notebook process tree could not be stopped.',    options?: ErrorOptions & { recovery?: NotebookExecutionRecovery }  ) {    super(message, options)    this.name = 'NotebookExecutionStopError'    this.recovery = options?.recovery  }} // Typed host evidence survives cleanup failures without trusting text printed by executed code.export class NotebookKernelExitError extends Error {  constructor(    message: string,    public recovery: NotebookExecutionRecovery  ) {    super(message)    this.name = 'NotebookKernelExitError'  }} export const notebookErrorRecovery = (error: unknown): NotebookExecutionRecovery | undefined => {  if (error instanceof NotebookKernelExitError) return error.recovery  if (error instanceof NotebookExecutionStopError && error.recovery) return error.recovery  if (error instanceof NotebookExecutionStopError && error.cause instanceof NotebookKernelExitError)    return error.cause.recovery  return undefined} // In-process owner evidence, separate from immutable historical recovery diagnostics. Only the// executor that owns the failed process may mark its exact exit object as cleaned up.const cleanedUpKernelExits = new WeakSet<NotebookKernelExitError>() export const markNotebookKernelExitCleanedUp = (error: unknown): void => {  if (error instanceof NotebookKernelExitError) cleanedUpKernelExits.add(error)} export const isNotebookKernelStopResolved = (error: NotebookExecutionStopError): boolean =>  error.cause instanceof NotebookKernelExitError && cleanedUpKernelExits.has(error.cause)