Update src/ml_flashpoint/core/checkpoint_loader.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: ronaldw07

src/ml_flashpoint/core/checkpoint_loader.py

@@ -128,6 +128,7 @@ def __init__(
         self,
         checkpoint_object_manager: CheckpointObjectManager,
         replication_manager: ReplicationManager,
+        *,
         global_rank_getter: Callable[[], int] = dist.get_rank,
         local_rank_getter: Callable[[], int] = dist.get_node_local_rank,
         broadcast_object_list_func: Callable[..., None] = dist.broadcast_object_list,