fix: replace ws library with native WebSocket for CDP reliability

[Parithosh-Varma]

Problem

The bundled ws WebSocket library causes Unexpected server response: 101 errors when tools like browser_navigate, browser_click, and browser_fill try to connect to Chrome's CDP endpoint. This happens because the ws library bundled via bun build doesn't handle the WebSocket handshake correctly in all runtimes.

Fix

• Replaced ws import with the native WebSocket API (available in Node 21+ and Bun)
• Added connection retries (3 attempts) with backoff
• Added a 5-second connect timeout
• Changed readyState checks to use numeric constants instead of WebSocket.OPEN

Testing

Verified locally that browser_list, browser_navigate, browser_snapshot, browser_click, browser_fill, browser_eval, and browser_screenshot all work with Chrome started via:

/Applications/Google Chrome.app/Contents/MacOS/Google Chrome --remote-debugging-port=9222 --user-data-dir=/tmp/chrome-debug --disable-gpu --no-first-run &