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New engines start from the shared test kit (the template's tests are a one-line EngineContractTests subclass) and the host APIs, so they don't re-derive geometry reading, work areas or validator tolerances. BENCH-RULES.md now forbids clocks, unseeded randomness and environment variables from influencing placement (budgets count work; wall time only through the host's cancellation token) and lists the kit as read-only. Build-Engines.ps1 deploys only OpenNest.Engine.* folders, and New-Engine.ps1 -IncludeBuildFiles copies the kit. Co-Authored-By: Codex <noreply@openai.com> Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>