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* fix(worker): don't fail the parent run on a subagent error carried by task_running The worker scans root frames for the LLM error-fallback marker to decide the parent run's status, and custom frames are root frames. task_running events carry each delegated subagent message, including a subagent's marked error fallback, so a subagent that failed after retries marked the whole parent run as error (and an edit-and-rerun rolled back) even though the executor already reported task_failed and the lead answered. Skip custom frames in both the single-mode and multi-mode stream paths. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * test(worker): cover the single-mode stream loop for task_running fallbacks Run the task_running regression test with stream_modes=["custom"] too, which takes the worker's single-mode loop. Without the single-mode guard only that case fails. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5 <noreply@anthropic.com>