K32 perturbations
ε1.0° per perturbation
rotationpassive ZYZ · coefficient-space
axis mappingGEO-consistent · invertEulerZYZ
D_internalmedian |Δθ₂₃| over K perturbations
test S0 < D_internal < 10ε (stable)
test RD_rand / D_stable ≥ 3 (collapse)
rng seed0x9E3779B9 (or from GEO export)