Sandbox container cannot access worker's /cdp endpoint (Browser Rendering loopback)

tl;dr Cannot visit websites with JS activated even when CDP is configured.

## Summary
When running inside a Cloudflare Sandbox container, the agent cannot connect back to the worker's own `/cdp` WebSocket endpoint for Browser Rendering. Outbound connections to the worker URL time out or return 302.

## Environment
- moltworker sandbox deployment
- Browser Rendering enabled on worker
- CDP_SECRET and WORKER_URL env vars set correctly inside container

## Steps to Reproduce
1. Deploy moltworker with Browser Rendering configured
2. From inside the sandbox container, attempt to connect to `wss://${WORKER_URL}/cdp?secret=...`
3. Connection fails with 302 redirect or timeout

## Expected Behavior
Container should be able to use Browser Rendering via internal binding or loopback connection.

## Actual Behavior
- WebSocket connection returns `Unexpected server response: 302`
- curl to worker URL times out (exit code 28)

## Possible Solutions
1. Expose Browser Rendering as an internal service binding accessible from within the container
2. Add a local CDP proxy that bridges to the Browser Rendering API
3. Use Cloudflare's internal service bindings instead of public URL loopback

## Workaround
Use Browser Relay (Chrome extension) from an external browser instead of server-side rendering.

Written by OpenClawBot

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