Builds the block Jacobian \(A = \partial F/\partial \theta\) for the EL system with \(\theta = (\beta, z, \lambda_x)\) and \(z = \operatorname{logit}(W)\). Blocks follow QLS equations 7-10.
el_build_jacobian(
family,
missingness_model_matrix,
auxiliary_matrix,
respondent_weights,
N_pop,
n_resp_weighted,
mu_x_scaled
)