- Replace simple no-op test callbacks with explicit undefined returns
- Remove no-empty-function exceptions for autosave, stroke picker, font settings, pen, tauri, AI adapter, and undo helper tests
- Validate check plus affected engine and E2E tests
- Configure oxfmt custom import groups for workspace, app, package, and test aliases
- Keep type imports grouped with their matching source category instead of one global tail group
- Expand the format script to cover formatter config, Vite files, and scripts
- Move top-level engine and e2e prefixed test files under domain folders
- Update fixture path helpers after moving render and pen tests
- Add lint coverage to prevent new top-level prefixed test files
- Refresh testing docs for the new fig and layout paths
