Dispatch spatial Laplace to the correct C++ backend
Source:R/fit_laplace.R
dispatch_laplace_spatial.Rdweights is the per-observation likelihood weight. It reaches the same
BuiltinFamilyResponse::weights channel the non-spatial route uses, which
scales each row's log-density, score and Fisher curvature by the same w_i,
so the mode these kernels return and the marginal precision
.marginal_H_beta_*() builds at it describe one model.