fix[format]: format platform test file

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: aschlean

tests/core/test_platform.py

@@ -68,6 +68,7 @@ def test_function() -> Output:
             mock_context.post.assert_called_once()
             call_args = mock_context.post.call_args
             from golf import _endpoints
+
             assert call_args.args[0] == _endpoints.PLATFORM_API_URL
 
             # Verify request headers