Fixes a regression introduced by the prior approach (synchronous import
hermes_cli.gateway inside _lifespan) that caused a new failure mode:
the blocking import stalled the asyncio event loop before uvicorn could
bind its port, pushing HERMES_DASHBOARD_READY past the desktop shell's
45 s announcement deadline and triggering a respawn loop that accumulated
orphaned backend processes.
Two-part fix:
_lifespan: replace the blocking import with a fire-and-forget
run_in_executor call (_warm_gateway_module). The import runs in a
worker thread while the server socket is already open, so
HERMES_DASHBOARD_READY fires without delay.
get_status: replace the inline lazy import with
await run_in_executor(None, _resolve_restart_drain_timeout). This is
the root fix for the original 15 s socket-timeout: the blocking
.pyc-compilation + Defender scan is offloaded to a thread, keeping the
event loop free for every /api/status probe. After the first call the
module is in sys.modules and the executor returns in microseconds.
Both helpers are extracted as module-level sync functions so they can
be unit-tested independently of FastAPI or uvicorn.
Closes#50209
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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