_run_ssh() waits for the remote process's exit status before reading
stdout and stderr. When a command produces more output than the
channel's flow-control window can hold, the server stops sending, the
remote process blocks on its write and never exits, and
recv_exit_status() blocks forever.
Drain stdout and stderr to EOF first - the channels close when the
process exits, so reading them also implies completion - and only
then query the exit status.
Assisted-by: unsloth/Qwen3.8-27B-GGUF:Q4_K_M with pi.dev v0.84.2
Signed-off-by: Jan Lindemann <jan@janware.com>