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>