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/a11y.mdx

@@ -11,13 +11,13 @@ what the ones below/above it can't.
 
 ## The layers
 
-1. **Axe on every story** (WP-01) — `@storybook/addon-a11y` in the panel, plus
+1. **Axe on every story** — `@storybook/addon-a11y` in the panel, plus
    `@storybook/test-runner` + `axe-playwright` gating CI (`npm run test-storybook:ci`).
    Catches structural/contrast/ARIA-shape violations on every component, automatically,
    as soon as a story exists. Escape hatch: `parameters: { a11y: { disable: true } }`,
    only with an inline justification comment + a cross-reference to the WP that will fix
    it (see e.g. `task-list.stories.ts`).
-2. **Template a11y lint** (WP-17) — `angular-eslint`'s `templateAccessibility` config
+2. **Template a11y lint** — `angular-eslint`'s `templateAccessibility` config
    (`alt-text`, `label-has-associated-control`, `click`/`mouse-events-have-key-events`,
    `interactive-supports-focus`, `valid-aria`, `no-autofocus`, …) running on every inline
    template via `angular.processInlineTemplates` (this repo has no `.html` files — every
@@ -25,7 +25,7 @@ what the ones below/above it can't.
    into a virtual file the template rules can lint). Catches missing alt text, unlabelled
    controls, and interactive elements that can't be reached by keyboard — at lint time,
    before a story even exists.
-3. **Play tests** (WP-16) — Storybook stories assert the wiring axe/lint can't see:
+3. **Play tests** — Storybook stories assert the wiring axe/lint can't see:
    `form-field.stories.ts`'s canonical composition asserts `aria-describedby` joins
    `-desc`/`-error` in the right order; `alert.stories.ts` asserts `role="alert"` for
    errors vs `role="status"` for info/ok/warning. These run as part of the same