The version resolve assumed `GET {objecttype}/versions` returns a bare list.
Every other collection in the Objecttypen API returns a paginated envelope, and
nothing in the repo exercises that endpoint, so the shape was a guess. Follow
the path infra/registerrecord-check.py already proves against the real API
instead: read the `versions` URLs off the objecttype and fetch each for its
status. Costs a request per version, once per gateway instance.
ACL mutation score 92.23% (baseline 91.37%).