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Collision stays hand-rolled because it is the reference for a future GPU kernel, but its inputs now come from Clipper region offsets. Pin down that lines-only, round-join, 1e-4-precision polygons keep the contact and part-in-part semantics: a neighbor inside a collapsed slot, a part inside a hole that shrank by the spacing, and zero-spacing edge contact. Document which steps are per-polygon preparation to cache and upload once, and which are per-pair kernel-shaped work. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>