The frozenset was a parallel structure for a per-row fact, and the comment
above the tuple already described it as a fourth column -- so the comment
promised the right shape and the code did something else. Fixed to the shape
the comment described: _AIR_QUALITY_SENSORS carries state_class per row and
the comprehension unpacks it, with _RECORDED_AIR_QUALITY and its duplicated
rationale block deleted.
air_monitor imports the same rows and now unpacks four, but discards the
fourth. That board (issue #210) has stamped all five readings as
`measurement` since it was added; consuming the column would silently drop
long-term statistics for Odor and CleanLevel on shipped devices, which is a
behaviour change this branch has no evidence to make. The grade/concentration
split stays scoped to the air purifier.
test_shared_sensor_tuple_keeps_its_three_column_shape asserted the premise
this replaces -- that widening the tuple breaks air_monitor's import -- so it
is replaced rather than renumbered: one test that the rows carry their own
state_class, and one that air_monitor still imports and still stamps all five.
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