johno
346ad3665d
Add reusable k3s-node role with configurable options for server/agent modes. Configure john-endesktop as a k3s agent joining the cluster at 10.0.0.222. Role supports: - Server or agent role selection - Configurable server address and token file - Graceful node shutdown - Optional firewall port opening - Cluster initialization for first server Note: NixOS nodes must be labeled with `k3s-upgrade=disabled` to exclude them from the system-upgrade-controller, since NixOS manages k3s upgrades through Nix rather than in-place binary replacement.