Conduit responds to requests with either `ERR-INVALID-SESSION` or `ERR-INVALID-AUTH` if the request wasn't sufficiently authenticated. Arcanist's `patch` workflow can automatically attempt to recover from situations in which Conduit responds to unauthenticated requests with `ERR-INVALID-SESSION` (by resending an authenticated version of the request), but not `ERR-INVALID-AUTH` - recover from `ERR-INVALID-AUTH` in the same way.