refactor: strip WP-/RB- ticket refs from apps and libs (RD-18)

204 WP-NN/RB-NN comments named a closed ticket instead of the code they
sit next to. git blame already records history and stays correct when
code moves; the comment does not. This sweep removes the reference and
keeps the sentence, across 95 files in apps/ and libs/ plus the
behaviour-spec generator's header text.

Eleven references stay: five story files justify an a11y disable per
the README's rule, and one line in a11y.mdx documents that convention.
Two sentences needed a rewrite, not a deletion, so the reference's
meaning survives its removal. behaviour-spec.mdx is regenerated, not
hand-edited.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

libs/shared/src/application/history.ts

@@ -18,8 +18,8 @@ export interface History<T> {
  * restore a returned snapshot by re-dispatching a `Seed`-style Msg — this helper only
  * shuffles references, it never mutates them, so the caller must hold copy-on-write state
  * (every edit produces a fresh value). Both stacks are capped so a long session can't grow
- * unbounded. Extracted from BriefStore's WP-27 undo/redo (WP-31); reused by the stamdata
- * editor (WP-32).
+ * unbounded. Extracted from BriefStore's undo/redo; reused by the stamdata
+ * editor.
  */
 export function createHistory<T>(cap = 50): History<T> {
   const past = signal<readonly T[]>([]);