No graceful shutdown: a deploy restart cuts in-flight pushes and builds #105

serve blocks on an error channel and never traps a signal or calls Shutdown; there is no signal.Notify in cmd/gitbayd or internal/httpd. Every make deploy restart (deploy/install.sh) can interrupt a receive-pack mid-write, a build-log append or a webhook delivery, and the webhook and mirror worker contexts are never cancelled.

Remedy: trap SIGTERM, Shutdown the HTTP server with a deadline, cancel worker contexts, drain the SSH listener.