Vercel Daemons Add HTTP Liveness Checks

This makes Daemons feel more production-ready, though fixed-capacity workers still require more operational discipline than autoscaling functions.

• –Liveness checks catch wedged processes that have not technically exited.
• –Automatic restarts reduce manual intervention for queue consumers and workflow workers.
• –Daemons remain focused on pull-based background workloads rather than inbound HTTP services.
• –Teams still need separate readiness checks and external monitoring for dependency failures.
• –The feature strengthens Vercel’s broader push into full-stack infrastructure beyond frontend deployments.