realm_alias_homograph_forbidden· reason_code· applies to schema_validation, service_callRealm alias registration collided with the same authority-local realm-alias-namespace UTS #39 skeleton index or failed its declared Highly Restrictive registration policy. Skeletons do not define canonical equality; cross-namespace handle/realm-alias homographs are disambiguated by sigil and type context. See zh/discovery/object-addressing.md §3.3.