Adds an in-process aiohttp stub on 127.0.0.1:18999/health so the framework's
periodic healthcheck has something live to talk to. Operators can override
with BACKEND_HEALTH_URL to point at their queue consumer's /health
endpoint, so the autoscaler marks the worker errored if the consumer dies.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
A PyWorker that does not forward to any model server. POST /reserve holds
the worker busy until the client disconnects (or the duration cap elapses),
so users with their own job queue can drive Vast autoscaling without
exposing inbound model traffic on the instance.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
