Convert CDT.Core to deterministic integer arithmetic for Unity compatibility#17
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…ibility Replaces all floating-point predicates and generic types with exact integer arithmetic. Adds Int128 polyfill (net5.0/Unity), rewrites Int256 to avoid UInt128 via 32-bit schoolbook multiplication, adds PredicatesInt (Orient2d, InCircle, IntersectionPosition) with Int256 intermediates, concrete integer KdTree, V2i/Box2i types, and removes PredicatesAdaptive/PredicatesExact. Triangulation<T> becomes non-generic Triangulation operating on V2i. Targets net5.0;net6.0;net8.0;net10.0 for Unity package compatibility. Updates Benchmarks and Viz to the new API. Fixes CI to install .NET 6 and use a directory-based Coverlet output with glob pattern for ReportGenerator to handle multi-TFM coverage files correctly. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Opened against wrong repo by mistake