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* claim: #1209 Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_011YdMi9BDdjWZ8twfeBHAXz * Prism boolean: a curved edge at one level crosses the walls there only (#1209) The prism boolean sews its result slab by slab and keeps, for each section segment, the operand wall it was read beside; its history is built from those tags. `Stations::new` took every curved edge between two walls as crossing them at every level, so where two pieces of one cylinder are stacked (an arm's round end under a boss of that radius) the circle between them cleared the wall tags of every slab. `prism_lineage::sewn` then gave up, the join or cut came out with no history, and every face of the body was named from geometry (`exact: false`). A curve whose control points lie at one level (a B-spline, or a NURBS curve with positive weights, which lies in their convex hull) is at that level: it crosses the walls there only. Any other curve still spans every level. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_011YdMi9BDdjWZ8twfeBHAXz --------- Co-authored-by: Claude Opus 5.5 <[email protected]> Co-authored-by: bherbruck <[email protected]>