FDR / nonparametric / quantile / latent-class extenders (Phase 1.n)

Thin wrapper-as-extender entry points that delegate to canonical CRAN packages for local-FDR estimation (locfdr), FDR / q-values (fdrtool), quantile regression (quantreg), nonparametric kernel regression (np), Bayesian nonparametric Dirichlet-process mixtures (dirichletprocess), and latent-class mixed models (lcmm). Each function returns a two-element list with $method (the qualified upstream function name, or a multi-step string for compound pipelines) and $raw (the upstream return object), so downstream callers can pattern-match on shape while keeping the full upstream object available for inspection.