tests/gateway/test_session_model_override_routing.py::test_run_agent_prefers_session_override_over_global_runtime
tests/gateway/test_session_model_override_routing.py::test_background_task_prefers_session_override_over_global_runtime
tests/gateway/test_session_model_override_routing.py::test_gateway_auth_fallback_uses_fallback_model_from_config
tests/gateway/test_session_model_override_routing.py::test_gateway_auth_fallback_resolves_key_env_for_custom_provider