{
  "_format": "'<pdf_page>:<part_no>:<instance>': {'box': [x0, y0, x1, y1], 'reason': '...'}. Boxes are native diagram pixels (see pages.img_w / img_h). An override always wins and is reported as method='override'.",
  "_status": "Deliberately empty. Every reported metric is the generic algorithm's own, unassisted; adding overrides for the cases in tests/fixtures/gold_boxes.json would make the evaluation self-fulfilling. The mechanism is exercised by tests/test_localizer.py::test_override_wins_and_is_labelled_as_such."
}