install.sh writes the last 12 chars of the DMI system UUID to
config.d/machine_uuid.sys (0444) after git clone, so non-root scripts
can derive the hardware-bound hostname without needing dmidecode.
conf.dist reads machine_uuid.sys first; falls back to dmidecode (root)
or hostname -s (user) if the file is absent.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>