Use Rdpack for references and remove tau example from trace_plot documentation

Co-authored-by: osorensen <21175639+osorensen@users.noreply.github.com>

Author: Copilot

DESCRIPTION

@@ -24,10 +24,12 @@ LinkingTo:
     RcppArmadillo
 Imports: 
     Rcpp,
-    ggplot2
+    ggplot2,
+    Rdpack
 Depends: 
     R (>= 4.1.0)
 Suggests: 
     testthat (>= 3.0.0),
     label.switching (>= 1.8)
+RdMacros: Rdpack
 Config/testthat/edition: 3

R/trace_plot.R

@@ -2,7 +2,7 @@
 #'
 #' Visualize the timeseries dynamics of the alpha and tau parameters across
 #' timepoints. This function creates trace plots similar to Figure 4 (left) in
-#' Sørensen (2025).
+#' \insertRef{10.1214/25-BA1564}{BayesMallowsSMC2}.
 #'
 #' @param x An object of class `BayesMallowsSMC2`, returned from
 #'   [compute_sequentially()] with `trace = TRUE` in [set_smc_options()].
@@ -33,6 +33,9 @@
 #'
 #' @export
 #'
+#' @references
+#' \insertRef{10.1214/25-BA1564}{BayesMallowsSMC2}
+#'
 #' @examples
 #' \dontrun{
 #' # Fit a model with trace enabled
@@ -48,9 +51,6 @@
 #'
 #' # Create trace plot for alpha (default)
 #' trace_plot(mod)
-#'
-#' # Create trace plot for tau
-#' trace_plot(mod, parameter = "tau")
 #' }
 trace_plot <- function(x, parameter = "alpha", ...) {
   # Validate parameter