The benchmark validator and every engine test re-triangulated both parts
for each nearby pair. NestLayoutCheck now uses TriangulatedRegion, with
Collision.HasOverlap as the fallback when it cannot decide. Verdicts are
unchanged (the frozen-validator equivalence tests still pass); validating
100 discs went from 1,254 ms to 94 ms.
Co-Authored-By: Codex <noreply@openai.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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