forked from 1b-agent/opencadstudio-upstream
Foundation for double-single positions: WireModel now carries an index-paired f32 residual buffer (`points_low`) next to the existing `points` high half. Empty means "all-zero residual", so every existing constructor (interactive draw, previews) is unchanged in behaviour; tessellation from CAD f64 will fill it in the next steps so vertex precision survives at UTM-scale coordinates. Co-Authored-By: Claude Opus 4.7 <[email protected]>