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/besluit.machine.ts

@@ -1,6 +1,6 @@
 import { Result, assertNever } from '@shared/kernel/fp';
 
-/** The three actions the beoordeling screen offers a behandelaar (WP-65b) — mirrors the
+/** The three actions the beoordeling screen offers a behandelaar — mirrors the
     backend's `Besluit` enum member names 1:1 (the wire convention: a string, not a raw
     enum — see `RecordBesluitRequest`). */
 const BESLUIT_TAGS = ['Goedkeuren', 'Afwijzen', 'MeerInfoOpvragen'] as const;