The client list was `cfg.oidc.clients ++ hiveClients`, where the first
half comes through the submodule and the second was a raw attrset from
this module's `let` block. That list is only half-typed: a field added
to the submodule exists on the declared entries and not on the derived
ones, so reading it plainly is an eval error the moment hive identities
are on. The operator asked whether it should be uniformly typed instead
of guarding each read, and it should.
The hive identities are now declared the same way an operator declares
a client, so the module system applies the submodule to them and every
option's default is present. Downstream reads one uniformly-typed list
and the guard added for the field that broke is gone with it.
fd4b79f04a