feat(etl-uvicorn): cooperative SIGTERM shutdown via GracefulServer + CancellationToken#70

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aballman wants to merge 9 commits into

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aballman/infra-820-plugin-stop-in-flight-foundation

Commits on Jun 5, 2026

revert(etl-uvicorn): drop the inert ignore-SIGTERM signal patch (no-op on uvicorn 0.37)
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feat(etl-uvicorn): add CancellationToken + process shutdown event primitive
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feat(etl-uvicorn): add GracefulServer + serve() with finite graceful-shutdown default
aballman
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feat(etl-uvicorn): inject CancellationToken + PluginShutdown(503) shutdown-abort path
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test(etl-uvicorn): cover streaming PluginShutdown 503 path; tidy precheck loop
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feat(etl-uvicorn): launch etl-uvicorn CLI via GracefulServer with finite graceful timeout
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test(etl-uvicorn): cooperative-stop of a token-polling sync run-func
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chore(etl-uvicorn): bump to 0.0.45 + changelog for SIGTERM cancellation support
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test(etl-uvicorn): cover precheck + serve(); accurate changelog; copy CLI params
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