zeropg standalone (dedicated Postgres) on IBM Code Engine + COS — zeropg standalone dedicated Postgres

A real Postgres (PGlite) whose durable home is an object-storage bucket, in one
scale-to-zero container. A remote app connects over HTTP.

Faces:
  Wake:  GET  /wake            (call first; the request wakes the instance)
  Ready: GET  /ready           (poll until {"ready":true})
  SQL:   POST /sql  {"sql":"…"}
  REST (PostgREST): GET <this-url>/rest/<table>
  Metrics: GET /metrics

Wire protocol (real Postgres, libpq) is bound to loopback for Fly.io / raw TCP
later; this HTTP-only platform exposes the faces above.