Thin wrapper-as-extender entry points that delegate to canonical
CRAN packages for regression-discontinuity diagnostics
(rddensity, rdlocrand, rdpower), ordinal
vignette analysis (anchors), and alpha-NOMINATE
ideal-point estimation (anominate). Each function returns
a two-element list with $method (the qualified upstream
function name) and $raw (the upstream return object), so
downstream callers can pattern-match on shape while keeping the
full upstream object available for inspection.