The Tailscale login that could never finish

zimaboard2 appeared in my tailnet, I approved it, and then it sat there: offline, last seen 19m ago. I wanted the agent box on the ZimaBoard I rebuilt in January reachable from a laptop away from home. Tailscale rather than a forwarded port: it only carries traffic addressed to my own devices, so the rest of the LAN and every machine without it installed are untouched. No exit node, no subnet routing. I installed it on the board as a compose app with host networking, so the tailnet address reaches every port the board already publishes.