Capture what this session surfaced: the routing-common indexed-module
active/backup pattern, VRRP VIPs for gateway+DNS, the wan-online.target
convention, the networkd helper locations, and the "boxes not fleet"
terminology. Also note the fish login shell caveat for ssh scripting.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
`check-system` evaluates a NixOS config without building it; `ssh-machine`
SSHs to a system or home by name, resolving the target and ssh options
from its `deploy-rs` node. Document both in `AGENTS.md`.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
jackos1998