The hole and placement sections stay on main's Tools page and network locations on its General page; the geometry kernel section stays on the Design page. prepare_preferences refuses a kernel choice before main's checks. tests/KNOWN_FAILING_TESTS keeps solidcore's lines until rebuilt from a run on this tree. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01MNXLXkZLQ6T7TSi4wswcmk