ag-restorelisted

Restore the SmallTV to its pre-monitor state. 1. Show what the backup will restore, so the user knows what they are getting back: ```bash cat ~/.agent-glance/device_backup.json ``` If the file is missing, stop and tell the user there is no backup — setup was never run from this machine, so there is nothing to restore to. 2. Restore: ```bash python3 "${CLAUDE_PLUGIN_ROOT}/scripts/agent_glance.py" --restore ``` 3. Verify the device is back to its original themes and photos: ```bash curl -s -m 4 "http://${AGENT_GLANCE_IP}/theme/list" | python3 -m json.tool curl -s -m 4 "http://${AGENT_GLANCE_IP}/photo/list" | python3 -m json.tool ``` Report which themes/photos are enabled now. Note that the plugin's hooks still fire while the plugin is enabled — they will just re-upload `agent_status.gif` into the album on the next event. To stop updates entirely, the user should disable the plugin, not only run restore.