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>

docs/project/readable-codebase/README.md

@@ -112,7 +112,7 @@ two. Note that RD-15 exists because 22 abandoned agent worktrees are still on di
 | RD-15 | Remove 22 abandoned agent worktrees (4.7 GB)                                 | 01         |           | done   |
 | RD-16 | ~~`parseDashboardView` returns `BigProfile`~~ — DROPPED, see PLAN.md 2.2     | 01         |           | n/a    |
 | RD-17 | `successOf`/`successOr` sweep — 10 sites, 8 files                            | 01         |           | done   |
-| RD-18 | Ticket-reference sweep, frontend — 181 refs, 100 files                       | 01         |           | todo   |
+| RD-18 | Ticket-reference sweep, frontend — 181 refs, 100 files                       | 01         | yes       | done   |
 | RD-19 | Ticket-reference sweep, backend — 370 refs, 86 files                         | 01         |           | todo   |
 | RD-20 | `wizard-errors.ts` + spec, adopted by all 3 wizards                          | 02         |           | todo   |
 | RD-21 | `rich-text-dom.ts` helpers + spec cases                                      | 02         | yes       | todo   |