* Wire CrossSection to the boolean2 backend
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* Simplify CrossSection via vertex decimation, not merge-tolerance snap
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* Address wiring review: Hull/finite guards, inline mutex, signpost, asserts
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* Migrate CrossSection wiring to ApplyFillRule; Simplify decimates only
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* Defer transform tolerance scaling to GetPaths; fix Simplify comment
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* Tidy wiring comments to house style; use la::isfinite for guards
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* Cut over CrossSection from Clipper2 to boolean2
Replace the Clipper2-backed CrossSection implementation with the in-tree boolean2 one and drop the Clipper2 dependency, the MANIFOLD_CROSS_SECTION_BACKEND selector, and its CI and packaging plumbing. The public CrossSection API is unchanged: the FillRule argument is kept but only Positive construction is supported. Samples.Sponge4's degenerate-triangle bound is raised, since boolean2's Simplify leaves more near-collinear vertices (more benign zero-area tris; topology unchanged).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* Delegate single-contour CrossSection ctor to the Polygons one
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* Always build CrossSection; drop the MANIFOLD_CROSS_SECTION option
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* Flatten manifold::boolean2 into manifold; unify JoinType
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* Make SimplifyRing O(n log n) via min-heap with lazy invalidation
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* Drop stale MANIFOLD_CROSS_SECTION flag from the PR perf guard script
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* Scrub Clipper2 and the removed option from the new sanitizer CI script
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
