7554582056
Add draw_cap_png and a --cap-png flag: render tread 0 as a wheel (source hub, link-cycle rim, cap triangles filled, cap cut marked) from the extract_tread roles, since tread 0 is skipped by tire recognition (a wheel has no up teeth). Render funcD seed7's cap. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>