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>

apps/behandelportal/src/app/behandeling/domain/werkvoorraad-item.ts

@@ -1,5 +1,5 @@
 /**
- * A queue entry as the behandelportal sees it (WP-64) — the parsed, domain-side view
+ * A queue entry as the behandelportal sees it — the parsed, domain-side view
  * of the backend's cross-owner `GET /werkvoorraad`. Pure types, no Angular.
  *
  * The status union is narrower than the SSP's full `AanvraagStatus` (ssp's