forked from 1b-agent/opencadstudio-upstream
Mirrored INSERTs reverse OCS handedness, but acadrust's explode used to keep the original normal — making CCW-around-normal arcs and ellipses sweep the wrong way. The fix lives in acadrust 7c711e9, which flips the new normal when det < 0 and reprojects center/major_axis/angles into the new OCS. H7CAD's fix_mirrored_arc workaround is no longer needed.