The kernel moved from monstertruck to truck: truck's booleans handle blind holes, pockets and bosses that monstertruck's did not (see the ADR). Fillets and chamfers on straight convex edges between planar faces are our own exact local B-rep operation. The document holds parameters with unit-aware expressions and a timeline that re-evaluates incrementally. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>