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* fix(subagents): report model_length_capped when a subagent hits the output limit ModelLengthFinishReasonMiddleware only ran on the lead chain. A subagent whose response was cut at the provider output limit (finish_reason=length, stop_reason=max_tokens, MAX_TOKENS, Responses max_output_tokens) reached the lead as a clean `completed`, and a tool call truncated at that boundary still executed with partial arguments. Register the same middleware on the subagent chain, in the lead's relative position (after configured extensions, before Safety). It now also records each detected cap per context run_id and exposes `consume_stop_reason`, so the executor's existing duck-typed guard collection reports `stop_reason=model_length_capped`. Add the value to the subagent status contract (Python enum, contract fixture, frontend whitelist) with the label "model output length limit", and update the subagent docs. Tests cover the middleware channel, chain placement, the contract, and an end-to-end executor run with a fake model. Co-Authored-By: Claude Code <noreply@anthropic.com> * test(tasks): cover cap reasons on completed and failed runs Extend the existing shared-contract round-trip matrix to preserve both terminal statuses alongside every supported stop reason, including model_length_capped and loop_capped. --------- Co-authored-by: huangzz <110116@nd.com> Co-authored-by: Claude Code <noreply@anthropic.com> Co-authored-by: Willem Jiang <willem.jiang@gmail.com>