- Add broadcast_state_dict to sync state_dict from rank-0 to all ranks - Fix create_ref_model returning None on non-rank-0 under FSDP - Fix sync_old_model only updating old_model on rank-0 under FSDP - Split skip_no_cuda/skip_no_kernel markers and hoist to top-level conftest - Add distributed tests for broadcast_state_dict and create_ref_model