## Description
Add AI Bridge Proxy support to the copilot module. When enabled, the module configures proxy environment variables (`HTTPS_PROXY`, `NODE_EXTRA_CA_CERTS`) scoped to the copilot process tree (agentapi and copilot), routing Copilot traffic through AI Bridge Proxy without affecting other workspace traffic.
GitHub authentication is still required, the proxy authenticates with AI Bridge using the Coder session token but does not replace GitHub authentication.
Note: Uses [coder exp sync](https://coder.com/docs/admin/templates/startup-coordination) for startup coordination, ensuring the copilot module waits for the `aibridge-proxy` setup to complete before starting.
## Type of Change
- [ ] New module
- [ ] New template
- [ ] Bug fix
- [x] Feature/enhancement
- [ ] Documentation
- [ ] Other
## Module Information
**Path:** `registry/coder-labs/modules/copilot`
**New version:** `v0.4.0`
**Breaking change:** [ ] Yes [x] No
## Testing & Validation
- [x] Tests pass (`bun test`)
- [x] Code formatted (`bun fmt`)
- [x] Changes tested locally
## Related Issues
Depends on: #721
Related to: https://github.com/coder/internal/issues/1187
7e75d5d762