Unit tests for the generic host-setup paths across firecracker/docker/
macos-container — NixOS vs systemd (root/non-root) vs neither, missing
binary/daemon/service, persistence reporting, and the netpool shell
renderer. Lifts diff-coverage on the new setup code from ~0 to full.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WBMWTEtQdJ4W5UrWuLHCck
