VQkit v1.0.15 ELATE compatibility validation

Reference: supplied elate.py tensor and supplied young.csv generated by ELATE.
Young surface grid: 200 x 200 = 40000 points.

Young 3D Cartesian coordinate comparison
max |dx| = 7.105427e-14
max |dy| = 5.684342e-14
max |dz| = 7.105427e-14
RMS dx = 7.046458e-15
RMS dy = 6.666997e-15
RMS dz = 7.965911e-15
max Euclidean coordinate difference = 8.556068e-14

Shear envelope comparison
100 deterministic random (theta, phi) directions.
max |Delta G_min| = 0.000000e+00 GPa
max |Delta G_max| = 0.000000e+00 GPa
RMS Delta G_min = 0.000000e+00 GPa
RMS Delta G_max = 0.000000e+00 GPa

Conclusion: VQkit directional Young and shear definitions agree with the ELATE reference methodology to numerical precision for the same stiffness tensor.
