A default IHostInstanceIdentity for standalone use (and a sane fallback when the host
application does not inject one). Generates a stable unknown-host:pid:bootId identity at module
load. Production hosts (MJServer) inject the real HostInstance helper so the janitor's host
affinity matches across the whole deployment.
A default IHostInstanceIdentity for standalone use (and a sane fallback when the host application does not inject one). Generates a stable
unknown-host:pid:bootIdidentity at module load. Production hosts (MJServer) inject the realHostInstancehelper so the janitor's host affinity matches across the whole deployment.