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1cc42af8d6
Add GeomFill_Gordon and GeomFill_GordonBuilder classes implementing Gordon surface (transfinite interpolation) construction via the Boolean sum formula: S = S_profiles + S_guides - S_tensor. GeomFill_GordonBuilder is the low-level kernel accepting pre-compatible BSpline curves with known intersection parameters. GeomFill_Gordon is the high-level wrapper handling arbitrary Geom_Curve inputs, automatic intersection detection, network sorting/orientation, approximation-based reparametrization with kink preservation, scale-relative tolerances, closedness detection, and OSD_Parallel acceleration. Add Approx_BSplineApproxInterp class implementing constrained least-squares B-spline approximation with exact interpolation constraints via a KKT saddle-point system, used internally by the reparametrization pipeline. 45 GTests covering both classes validate bilinear through 6x6 networks, reversed/shuffled inputs, scaled geometry, surface continuity, and the Boolean sum mathematical property.