The HM pre-activation never ran: the script was written to /mnt/tmp and
nixos-enter mounts a fresh tmpfs over /tmp inside the chroot, so `bash
/tmp/...` found nothing and the best-effort guard swallowed it. Verified
interactively that every inner step (path: build as root, runuser leg)
works in the chroot — only the staging path was broken. Now staged in
/root, with set -x logging persisted to /var/log/nomarchy-hm-preactivate.log
on the target and the tail echoed into the install transcript on failure.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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