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/ssp/src/app/herregistratie/domain/intake.machine.spec.ts

@@ -171,7 +171,7 @@ describe('submit', () => {
     expect(withScholing.data.punten).toBe(200);
   });
 
-  it('does not require punten for a hidden question (WP-69 §6)', () => {
+  it('does not require punten for a hidden question', () => {
     // scholingGevolgd is a stale 'ja' from when uren was low, but uren is now above
     // threshold — the template hides the question, so punten must not be required either.
     const staleScholingNoPunten = givenIntake(
@@ -183,7 +183,7 @@ describe('submit', () => {
     expect(good.data.aanvullendeScholing).toBeUndefined();
   });
 
-  it('drops punten when raising uren hides the question (WP-69 §6)', () => {
+  it('drops punten when raising uren hides the question', () => {
     // Same stale answer, but this time punten was also filled in while uren was low.
     const staleScholingWithPunten = givenIntake(
       { tag: 'SetAnswer', key: 'buitenlandGewerkt', value: 'nee' },