Fix Host-Key Errors

Fix Host-Key Errors

Symptom: /setup-ssh or /diag reports the connection fails even though the credentials are correct.

Cause: The host key is not yet in ~/.ssh/known_hosts. Fleet Manager runs with BatchMode=yes and deliberately does not trust unknown hosts automatically.

Solution: Register the key once after reviewing the fingerprint:

ssh-keyscan -p <port> <host> >> ~/.ssh/known_hosts

Alternatively connect once manually (ssh -p <port> <user>@<host>) and accept the key. Then re-run /setup-ssh.