The PO is the operator's fleet-management Remote Control point; until now nothing
brought it back after a reboot. Mirrors lichen-orchestrator: oneshot + RemainAfterExit
running `agents.py up` as loops, which starts the PO agent and its watchdog. The PO's
agents.toml declares no `wake`, so the watchdog only heals a dead session — it never
sends periodic prompts.
Also lands the /mnt/data hardware.nix mount (by-uuid + nofail) that was sitting
uncommitted; fstab output is unchanged from the running system.
Deployed 2026-08-01: build delta was 5 derivations (the new unit + etc/system-units);
every other unit file byte-identical, dry-activate showed only a dbus reload. The
in-flight pi-coding-agent / launch.py work is parked on wip/pi-orchestrator-2026-08-01.
Co-Authored-By: Claude <noreply@anthropic.com>