Defense-in-depth for #1505. When the 'start' subcommand forks a daemon,
the parent bun process may be killed by signal (exit > 128). If the
close handler fires, treat this as success since the daemon started fine.
Note: the primary fix is in hooks.json since the SIGKILL often kills
the entire process group before this handler fires.
nimesh-kumar-sh
368daddd88