Docs mention private/internal _ identifiers, but authzed/api validation change is not merged yet #165

Hi Authzed team,

The SpiceDB schema docs currently mention support for private/internal identifiers prefixed with _:

https://authzed.com/docs/spicedb/concepts/schema#privateinternal-identifiers

However, it looks like the corresponding authzed/api validation change is still not merged:

#156

With current released dependencies, attempting to compile a schema containing a permission like _project_read_grants still fails validation with:

validation error: name: value does not match regex pattern `^[a-z][a-z0-9_]{1,62}[a-z0-9]$`

Could you clarify whether _-prefixed private/internal identifiers are intended to be available in a released SpiceDB/authzed/api version already, or whether the documentation was published ahead of the implementation/release?

If this is not yet released, it would be helpful if the docs mentioned the minimum required version once the feature lands.

Thanks in advance!