inbuxa-server renames the identifiers that carried the upstream name (its SPEC.md §2.4). Upstream's capability for the registry (x:) objects is now urn:inbuxa:jmap:registry, beside the fork's own urn:inbuxa:jmap, which is unchanged. There's no alias, so this lands with the server change and deploys with it. The mock advertises the new name too. No user-visible strings change.