The loader now settles udev before probing, so a fast boot cannot miss
the drive and silently drop a headless install into the wizard. All the
files come over in a single cp, and a failed copy removes anything it
already copied and falls back to the wizard: the wizard cleans up only
what it writes itself, so a half-copied ssh.json would otherwise leak
into the interactive install that follows. The command takes an optional
path prefix so tests can run it against a sandbox instead of the live
system.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
