fix(subagent): preserve published run failures

packages/workflow/workflow-workerthread/src/protocol.ts

@@ -56,7 +56,7 @@ export enum HostToWorkerType {
   Go = 'go',
   /** Cancel the run: hooks start throwing and the script dies at its next await. */
   Cancel = 'cancel',
-  /** Child RPC reply: the provider fulfilled with a ready run (exactly one start reply per ChildStart). */
+  /** Child RPC reply: the provider fulfilled with a published run (exactly one start reply per ChildStart). */
   ChildStarted = 'child-started',
   /** Child RPC reply: the provider's asynchronous start failed. */
   ChildStartError = 'child-start-error',

packages/workflow/workflow-workerthread/src/session.ts

@@ -89,7 +89,7 @@ class ChildRpcBridge implements ChildPort {
     return new RpcChildHandle(this.post, callId, entry, childId)
   }
 
-  /** The host established a ready child; releases the `startAgent` await. */
+  /** The host established a published child; releases the `startAgent` await. */
   onChildStarted(callId: number, childId: string): void {
     this.pending.get(callId)?.started.resolve(childId)
   }

packages/workflow/workflow-workerthread/src/types.ts

@@ -87,7 +87,7 @@ export interface ChildPort {
   /**
    * Start one child agent on the host (the `agent()` hook's start half).
    * @param request - the prompt and validated options.
-   * @returns the ready child handle; rejects when synchronous start or the
+   * @returns the published child handle; rejects when synchronous start or the
    *   provider's asynchronous start fails.
    */
   startAgent(request: ChildStartRequest): Promise<ChildHandle>