fix(gateway): interrupt delegated subagents on shutdown#26330
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This was referenced May 15, 2026
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Closes #26315.\n\n## Summary\n- add a process-wide helper to interrupt registered delegated subagents\n- have gateway shutdown/restart call that helper as a safety net before adapter teardown\n- make delegate_task stop waiting for child futures when the parent agent is interrupted, including batch delegation\n\n## Tests\n- python -m pytest -o addopts= tests\agent\test_delegate_shutdown_interrupt.py -q --tb=short\n- python -m pytest -o addopts= tests\gateway\test_session_race_guard.py::test_shutdown_skips_sentinel tests\gateway\test_shutdown_cache_cleanup.py -q --tb=short\n- python -m pytest -o addopts= tests\agent\test_subagent_stop_hook.py tests\cli\test_cli_interrupt_subagent.py -q --tb=short\n- python -m ruff check tools\delegate_tool.py gateway\run.py tests\agent\test_delegate_shutdown_interrupt.py\n- git diff --check