Owner ruling Q6: the retail-contradicted `double t` is rejected; the helper
cleanup may land at zero credit. _sphere_intersects_cluster_portal now uses
one shared FALSE exit and the real point_from_line3d call in place of the
hand-expanded rows, with production's names and types kept. It stays
residual at January's 432 bytes, and no other function changes.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>