A bundle path is a file, so config resolution took the directory branch and
was rejected for having no model_index.json. Resolve it from the transformer
_class_name the checkpoint declares about itself, via an explicit alias table.
Keyed on the class name, not the registry model_id (a positional index that
rebinds on registration-order changes). No wildcard fallback and no file-name
inference; an unmapped class raises naming the table and the override.
verify_model_config_and_directory is unchanged.
William Lin
6343eadbec