Register GET /health/ready before the /api/* auth middleware so it is
public and reachable by K8s readinessProbe on port 3000 without auth.
On success → 200 {"status":"ready"}; on any DB/schema failure → 503
{"status":"degraded"}. Logs the pg error code; never leaks SQL in body.
A dropped schema (42P01) surfaces as non-200, closing the /health mask
that allowed the GRO-2678 incident to go undetected for ~43h.
Add health-ready.test.ts covering the 200 success path, 503 on schema
drop (42P01), and 503 on connection error; all assert no SQL leakage.
Co-Authored-By: Paperclip <noreply@paperclip.ing>