Venue-functional liveness probe (public).

GET 
/healthz/venue

Judges functional venue health: two-sided books, fill-tape freshness, and disk headroom. status is ok only when every check passes; failing checks are named in reasons. Served on the main API port (unlike /healthz//readyz//metrics, which live on the operations health port) so external uptime monitors can probe it.

Responses

200

Health verdict — HTTP 200 for BOTH healthy and unhealthy; monitors must match on data.status, not the status code.