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4c95dac078
Surface object with storage/index split, validity checks, accessors, sizing, copy, u/v swap, rationality conversions, closedness, equality, cheap flatness and average lengths; C++ shim, ffi wrapper, difftest runner and fixtures (Surface.sms, offset_nurb.sms, DropCurveSurface.sms, rectangle/polygon/cylinder and edge cases). difftest: 3220 cases, bit-identical. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>