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* fix(subagents): release batch executions the worker stops supervising _execute_item cleaned up its execution in a finally block, but the executor registry only removes terminal entries. When stop() cancelled an item task, the subagent was still running at that point: the cancellation request only signals it, so cleanup kept the entry, and nothing removed it once the run turned cancelled. Each in-flight item left its SubagentResult, transcript included, in the process-wide registry for every SDK SubagentRuntime start/stop cycle. A repository error while polling took the same exit without even requesting cancellation, so the item was failed or requeued while its subagent kept running unsupervised, and a retry could run it twice. On either exit, cancel a run that is not terminal yet and remove its entry from the persistent subagent loop once it stops. Cancellation is cooperative, so the wait is bounded by the item's lease, after which another worker owns the item and the entry is removed regardless. * docs(changelog): reference #6785 * fix(subagents): log a scheduled batch release that fails A concurrent future never reports an exception nobody retrieved, so a release that raised on the subagent loop leaked its registry entry with no log trace. Log it at error level with the execution id, as the task tool's deferred cleanup already does. --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>