test_markdown_renderer_does_not_import_render_extensions
test_search_does_not_import_bookmarks
test_tree_rendering_does_not_import_bookmarks
test_layout_does_not_import_annotations_or_slides
test_core_does_not_import_builtin_feature_extensions_except_registry
These can use source scanning with path.read_text() and forbidden import
strings.