tests/gateway/test_max_tokens_propagation.py::test_top_level_max_tokens_propagates
tests/gateway/test_max_tokens_propagation.py::test_per_provider_max_output_tokens_fallback
tests/gateway/test_max_tokens_propagation.py::test_global_max_tokens_beats_per_provider
tests/gateway/test_max_tokens_propagation.py::test_env_override_beats_everything
tests/gateway/test_max_tokens_propagation.py::test_no_config_leaves_max_tokens_none
tests/gateway/test_max_tokens_propagation.py::test_lift_helper_accepts_alias_and_rejects_garbage