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4727f7c049
Extract derivative calculation logic from GeomEvaluator and Geom2dEvaluator classes into dedicated utility headers: - Geom_OffsetSurfaceUtils.pxx for 3D offset surface derivatives - Geom_OffsetCurveUtils.pxx for 3D offset curve derivatives - Geom2d_OffsetCurveUtils.pxx for 2D offset curve derivatives - Geom_ExtrusionUtils.pxx for extrusion surface calculations - Geom_RevolutionUtils.pxx for revolution surface calculations Utility functions provide unified handling of singular and non-singular cases with osculating surface support for higher-order derivatives. Buffer management uses NCollection_LocalArray for stack-safe allocation with heap fallback when sizes exceed expected limits. Test case expectations updated to reflect improved calculation accuracy.