Modernise messaging infrastructure with cli support

Rewrites message_(), warning_(), stop_() to use cli::cli_inform(),
cli::cli_warn(), and cli::cli_abort() when the cli package is available,
with a fully functional plain-text fallback for environments without cli.

Key changes:
- New cli_to_plain() helper converts cli inline markup ({.fun}, {.arg},
  {.val}, {.field}, {.cls}, {.pkg}, {.href}, {.url}, etc.) to readable
  plain-text equivalents for the non-cli fallback path
- word_wrap() simplified: drops add_fn, ANSI re-index algorithm, RStudio
  link injection, and operator spacing hack; returns pasted input unchanged
  when cli is available
- stop_() no longer references AMR_env$cli_abort; uses pkg_is_available()
  directly; passes sys.call() objects to cli::cli_abort() call= argument
- Removed add_fn parameter from message_(), warning_(), and word_wrap()
- All call sites across R/ updated: add_fn arguments removed, some paste0-
  based string construction converted to cli glue syntax ({.fun as.mo},
  {.arg col_mo}, {n} results, etc.)
- cli already listed in Suggests; no DESCRIPTION dependency changes needed

https://claude.ai/code/session_01XHWLohiSTdZvCutwD7ag2b

R/join_microorganisms.R

@@ -143,9 +143,9 @@ join_microorganisms <- function(type, x, by, suffix, ...) {
     if (is.null(by) && NCOL(x) == 1) {
       by <- colnames(x)[1L]
     } else {
-      stop_if(is.null(by), "no column with microorganism names or codes found, set this column with `by`", call = -2)
+      stop_if(is.null(by), "no column with microorganism names or codes found, set this column with {.arg by}", call = -2)
     }
-    message_('Joining, by = "', by, '"', add_fn = font_black, as_note = FALSE) # message same as dplyr::join functions
+    message_('Joining, by = "{by}"', as_note = FALSE) # message same as dplyr::join functions
   }
   if (!all(x[, by, drop = TRUE] %in% AMR_env$MO_lookup$mo, na.rm = TRUE)) {
     x$join.mo <- as.mo(x[, by, drop = TRUE])
@@ -185,7 +185,7 @@ join_microorganisms <- function(type, x, by, suffix, ...) {
   }
 
   if (type %like% "full|left|right|inner" && NROW(joined) > NROW(x)) {
-    warning_("in `", type, "_microorganisms()`: the newly joined data set contains ", nrow(joined) - nrow(x), " rows more than the number of rows of `x`.")
+    warning_("in `{type}_microorganisms()`: the newly joined data set contains {nrow(joined) - nrow(x)} rows more than the number of rows of {.arg x}.")
   }
 
   as_original_data_class(joined, class(x.bak)) # will remove tibble groups