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* fix(deploy): exec the gateway server so SIGTERM reaches uvicorn The production compose command, both CMDs in backend/Dockerfile and the Helm chart start the Gateway as `sh -c "cd backend && ... uv run ..."`. dash forks uv and stays PID 1 without a SIGTERM handler, so the kernel drops the stop signal: uvicorn never shuts down, the lifespan teardown (memory flush, run drain, service stops) never runs, and every stop waits out the grace period and ends in SIGKILL (exit 137). exec the server in every production launch path, as docker/dev-entrypoint.sh already does, and give the compose gateway `init: true` so orphaned grandchildren are still reaped once sh is no longer PID 1. A regression test pins exec in each launch path. Fixes #6835 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * docs(changelog): link the gateway SIGTERM entry to #6836 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * test(gateway): decouple dependency sync from exec launch form * docs: compact startup guidance to pass inherited size limits * docs: trim inherited startup guidance after main merge --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: Willem Jiang <willem.jiang@gmail.com>