`status` was the only lister: misnamed, silently ignoring the `<box>` its own
help advertised, and unable to show a snapshot label — the one thing the
README's snapshot→clone flow requires you to know. Typing the obvious
`claudebox list` printed the help and exited 0.
- `list` — a table of your boxes (name, state, type, snapshot count).
- `info <box>` — detail, the snapshot labels, and the `--from` line to clone one.
- `list <box>` is a wrong guess we can answer: it points at `info`.
- `--json` passthrough; `--remote` honored; a real error on an unknown box.
- `status` stays as a deprecated alias for `list` so muscle memory keeps working.
Reads are filtered by the `user.claudebox=1` tag, so an Incus instance
claudebox didn't mint is never reported on or touched.
Closes#7
