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Engines had to reverse-engineer the benchmark validator: Opus55 assumed a 0.01 arc tolerance (the validator uses 0.001), Gpt6Astra added hand-tuned paddings and copied the validator's check order, Qwen picked its chord tolerance to stay under a constant it could not reference. NestTolerances publishes the validator's arc tolerance, the Clipper grid and SafeClearanceMargin (with its derivation). NestLayoutCheck moves the benchmark NestValidator's checks into OpenNest.Engine as a public API (Clears for a part pair, Violations for a whole result); NestValidator is now a thin wrapper. Verdicts are unchanged: tests compare ordered violation lists against a frozen copy of the old validator, and a tangent-disc stress test covers 432 pairs at the safe margin. Co-Authored-By: Codex <noreply@openai.com> Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>