Workers Browser Rendering API enters open beta

Introduces the open beta of the Workers Browser Rendering API, enabling programmatic control of headless Chromium instances via the DevTools Protocol. Integrates with Wrangler for deployment and provides a patched, open-source version of Puppeteer (@cloudflare/puppeteer) for easy automation. Demonstrates a screenshotting example Worker. Highlights internal usage for Cloudflare Radar's URL Scanner and outlines future plans for upstreaming Puppeteer changes, supporting Playwright, and exploring WebDriver BiDi.