78d6743 committed PowerMenu's half and never added the file, so the
singleton in qmldir resolved to nothing and the shell would not load on a
tree that had not been hand-linked.
HidController streams to usb-hid-inject and acknowledges every accepted
report, closes both endpoint fds on the busy edge before usb-signaller
tears the functions down, and refuses non-ASCII on the glass instead of
clearing a field whose first report was never written.
The face reports the agent and host results back to the page, and
deploy.sh stages the tracked face assets before the QML switch so a new
control cannot arrive without the page that implements it.
