scripts/test-aur-remote.sh: SSHes to a remote x86_64 server, spins up
an Arch Docker container, installs btest-rs from AUR, runs TCP + UDP
loopback tests, and cleans up.
Usage: ./scripts/test-aur-remote.sh root@myserver
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
