Release validation hygiene

Changed

• Updated WordPress smoke-test response assertions to read captured HTML
  directly, preventing successful early matches from surfacing as pipeline
  failures when grep -q closes its input under pipefail.

Removed

• Removed an obsolete one-off CommonJS screenshot helper that duplicated the
  supported TypeScript screenshot workflow, violated the repository's
  TypeScript-only tooling contract, and caused ESLint to fail in clean CI
  checkouts.