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963f8d86b7
Port Z Anti-Aliasing from BambuStudio-ZAA (https://github.com/adob/BambuStudio-ZAA) to OrcaSlicer. ZAA eliminates stair-stepping on curved and sloped top surfaces by raycasting each extrusion point against the original 3D mesh and micro-adjusting Z height to follow the actual surface geometry. Key changes: - Add ContourZ.cpp raycasting algorithm (~330 lines) - Extend geometry with 3D support (Point3, Line3, Polyline3, MultiPoint3) - Template arc fitting for 2D/3D compatibility - Change ExtrusionPath::polyline from Polyline to Polyline3 - Add 5 ZAA config options (zaa_enabled, zaa_min_z, etc.) - Add posContouring pipeline step in PrintObject - Update GCode writer for 3D coordinate output - Add ZAA settings UI in Print Settings > Quality - Add docs/ZAA.md with usage and implementation details ZAA is opt-in and disabled by default. When disabled, the slicing pipeline is unchanged.