cmd/gateway/main.go:144 constructs the adapter validator only when both
cfg.Auth.Enabled and cfg.Auth.JWKSURL are set. The config left jwksUrl unset on
purpose, so jwtValidator stayed nil and every adapter request passed with one
warning line:
auth required but jwtValidator nil; request unauthenticated
That made auth.required cosmetic: sqs, workflow, memory, s3 and iam all answered
unauthenticated calls. Set the JWKS URL to the ZITADEL key endpoint.