run shell command
$ sandbox.dispatch(flow_tool_command_run("pwd && find ..."))

{
  "exit_code": 0,
  "stdout": "/private/var/folders/q1/zd2rr4m962z413y81j14zyxc0000gn/T/rath-local-rqtmgm_j\n./notes/hello.txt\nhello from OpenRath local backend\n",
  "stderr": "",
  "elapsed_ms": 8.719875000679167
}