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New CadFeatureType::Rib (appended). A straight open Line entity in a sketch is offset ±thickness/2 along its in-plane perpendicular into a thin rectangle, extruded rib_depth along the sketch-plane normal, and fused to the target body. Line-only for now (ponytail; polyline/arc ribs are a later extension) — a non-line entity fails cleanly at recompute. Four serialized fields (rib_sketch_ref/rib_entity/rib_thickness/rib_depth) appended to both symmetric cereal lists (version stays 2, golden fixture regenerated 29525->30269). MCP: rib. 3 new [CadDocument][rib] tests; suite 86/1376. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01BVzKmX6Y1aEteit1HTXG4Q