Code enhancement#162
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Ajoute un optimiseur Newton diagonal coordonné (sans NLopt) pour les modèles PLN standard et ZIPLN, activable via PLN_param(config_optim = list(algorithm = "NEWTON")) ZIPLN_param(config_optim = list(algorithm = "NEWTON")) PLN (`nlopt_optimize_newton`, `nlopt_optimize_vestep_newton`) : - Newton diagonal pour B et M avec backtracking Armijo - Fixed-point exact pour logS : logS* = -0.5 log(Omega_jj + A_ij) - Guard overflow élément par élément : logS <= 0.5 log(max(1, 700-Z)) - Gains sur oaks : +38 loglik, 36% plus rapide que CCSAQ ZIPLN (`optim_zipln_M_S_newton`) : - Même approche, hessien diagonal ajusté pour le masque ZI - Défaut : CCSAQ conservé (Newton donne de mauvais optima locaux sur données très sparse) - Guard de covariance "covar" : substitue CCSAQ avant d'appeler NLopt Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
…log(S²) is used for optim)
…iational variance -> optimize log(S²)
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