Replace bare backticks with cli inline markup across all messaging calls

- {.arg} for argument names in stop_/warning_/message_ calls
- {.cls} after "of class" text in format_class() and elsewhere
- {.fun} for function names (replaces `fn()` pattern)
- {.pkg} for tidyverse package names (dplyr, ggplot2)
- {.code} for code literals (TRUE, FALSE, expressions)
- Rewrite print.ab: use cli named-vector with * bullets and code
  highlighting when cli >= 3.0.0; keep plain-text fallback otherwise
- Fix typo in as.sir(): "of must be" -> "or must be"
- switch sir.R verbose notes from message() to message_()

https://claude.ai/code/session_01XHWLohiSTdZvCutwD7ag2b

R/guess_ab_col.R

@@ -267,7 +267,7 @@ get_column_abx <- function(x,
       if (all_okay == TRUE) {
         message_(" OK.", as_note = FALSE)
       } else if (!isFALSE(dups)) {
-        message_("WARNING: some results from {.help [{.fun as.ab}](AMR::as.ab)} are duplicated: ", vector_and(dups, quotes = "`"), as_note = FALSE)
+        message_("WARNING: some results from {.help [{.fun as.ab}](AMR::as.ab)} are duplicated: ", vector_and(dups, quotes = FALSE), as_note = FALSE)
       } else {
         message_(" WARNING.", as_note = FALSE)
       }