Install the Nessie plugin and connect it to my Nessie account:
1. Run: openclaw plugins install clawhub:@nessielabs/nessie-openclaw
2. Ask me for my Nessie account email, then run: openclaw nessie init --email <email>
3. Nessie emails me a 6-digit code. Ask me for it, then run: openclaw nessie init --email <email> --code <code>
4. Run: openclaw nessie status and confirm it reports connected
5. Remind me to quit and reopen OpenClaw so the Nessie tools load
