Introduces a pluggable bend detection system in OpenNest.IO.Bending: - IBendDetector takes CadDocument directly to preserve MText/layer/linetype info - SolidWorksBendDetector finds lines on BEND layer with CENTER linetype and matches nearby MText notes - BendDetectorRegistry auto-registers SolidWorks detector and supports AutoDetect Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>