PASS: E[(U+iV)^n]=0, independent standard Gaussians, n=1,...,14 (exact moments).
PASS: observation/simulation decomposition at v_obs=3, v_sim=5, n=4, m=7 gives 13/14.
PASS: scalar cH=1 endpoint covariance = 3/2; interior covariance = 3/4.
Scope: these checks do not establish the general CLTs or rerun experiments.