Test interactive bash demo scripts end-to-end with expect over ssh -tt

To verify an interactive multi-step shell script that drives a remote cluster, run it from the laptop with expect: spawn ssh -tt host "bash script.sh" and answer each prompt only when it appears (expect { "pattern" { send "...\r"; exp_continue } ... eof }), including deliberately wrong answers to confirm validate-and-retry loops. This reproduces a human's timing, so it also catches bugs where inner ssh calls read stdin, which piping all answers up front would hide or trigger differently. Strip \r from the captured log (tr -d '\r') before reading it. Copy uncommitted scripts to a temp dir on the host instead of touching its git checkout.