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- Replace monolithic switch statements in BndLib_Add3dCurve, BndLib_AddSurface, and BndLib_Add2dCurve with thin wrappers delegating to GeomBndLib_Curve, GeomBndLib_Surface, and GeomBndLib_Curve2d respectively. - Remove now-dead internal helpers AddGenCurv, AddGenSurf, and BndLib_Box2dCurve. Public BndLib API is preserved unchanged. - Implement proper BoxOptimal() in GeomBndLib_OffsetSurface: try the analytic equivalent surface first (offset plane -> plane, offset sphere -> sphere), then fall back to OtherSurface PSO sampling for general cases. - Refactor GeomBndLib_OffsetCurve2d to share exact fast paths for line and circle offsets between Box() and BoxOptimal(), matching the 3D OffsetCurve pattern; BoxOptimal falls back to OtherCurve2d PSO for general curves. - Update tests to reflect tighter bounds from GeomBndLib delegation.