setup.focus and setup.floor follow forgectrl: a burn counts on the tube
current and the kernel's LASER_ON samples, and its result records the
beam sensor's rise and beam_sensor_seen, never requiring a rise (a head
may give no output from the sensor). The check reads that both are
recorded and logs them; the descriptions name the two witnesses.
Proof: the setup host tests (74) and the manifest tests pass, two of
them new: a burn whose sensor gave no output passes, and a result that
does not record the sensor fails, each with the settings put back.
Acceptance: these are the tests.
ScottW514
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