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init runs under #!/bin/sh but used $(<file) to read /etc/hostname, a bashism that breaks on a strict POSIX sh. I switched it to $(cat) and quoted $interface_up in the same script.
The two VM_IP assignments in the test scripts are read by the sourced validation.sh, which shellcheck can't follow, so they now carry a documented disable=SC2034 instead of a bare suppression. The rest of the shellcheck findings across the scripts are intentional (word-splitting on $SSH_OPTS, integer tests in [ ]) or already accepted, so I left them alone.
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