DxfImporter now filters ETCH entities (like BEND) since etch marks are generated from bends during export, not cut geometry. GeometryOptimizer no longer merges lines/arcs across different layers and preserves layer and color on merged entities. EntityView draws etch marks directly from the Bends list so they remain visible without relying on imported ETCH entities. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>