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/docs/layers.mdx

@@ -95,7 +95,7 @@ context, so the per-context scoping rule never applies to it in the first place.
 
 `npm run lint` (`eslint.config.mjs`) is a separate gate — mainly the `any`-free rule —
 and no longer carries the import-boundary rules above (moved to dependency-cruiser,
-WP-38/WP-67, so they don't have to be hand-copied per context).
+so they don't have to be hand-copied per context).
 
 ## The English/Dutch seam