A self-host operator running a fork of Multica with their own patches would
have their daemon silently upgraded to the upstream GitHub release, clobbering
the fork. Self-host setups also routinely pin to an older server, so a fresh
CLI may no longer talk to it.
Flip the default: auto-update remains opt-in on api.multica.ai and defaults to
off on any other server URL. Either side can override via
MULTICA_DAEMON_AUTO_UPDATE.
Co-authored-by: multica-agent <github@multica.ai>