Jest/Vitest Matcher for ARIA Live Regions

`extend-to-be-announced` is a utility package providing custom Jest and Vitest matchers, specifically `toBeAnnounced`, for robustly testing ARIA live regions. It aims to simplify accessibility testing by abstracting away the complexities of how assistive technologies handle live region updates, preventing common false positives associated with simply checking DOM text content. The package is currently at version 2.0.0 and receives updates as needed, particularly when underlying dependencies or testing frameworks evolve. It differentiates itself by leveraging `aria-live-capture` internally to precisely detect actual announcements, ensuring tests reflect true user experience rather than just DOM state. This approach helps developers write more reliable and accurate accessibility tests, especially for dynamic content updates.