SystemdLauncher::stop_all runs one synchronous systemctl stop over the
instance's mind-self and mind-persona units (stop_args, built from the same
templates as start and alive). cli::run gains a stop_units parameter that only
brake hold calls, after the write whatever its outcome. The window probe uses
dial set instead of brake hold, since a real hold now runs systemctl.
Builds not yet verified on the stopgap at this commit.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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