- Echo VERSION_X_Y_Z args back to guacd in CONNECT handshake
- Set guacd to network_mode: host so it can reach RDP targets on
NetBird/Tailscale overlay networks (100.64.x.x)
- App container uses host.docker.internal to reach guacd on host
- Add diagnostic logging for guacd→browser instruction relay
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>