Issue #166 (ARxxTXFCAWKNEU, board ARTIK051_PRAC_20K) reported tropical
night mode, clean level, dust, fine dust, odor, and super fine dust
entities showing up even though the reporter's units have no such
physical features. All six were added in #164.
The Sleep_<N> options token backing tropical_night_mode is present in
every AC dump on record regardless of confirmed reality, so there's no
usable signal at boot time -- it's now registered but disabled by
default (matching the precedent already set by fridge.rack_count /
cooktop.paired_hood_model), letting units that do have it opt in.
/sensors/vs/0's item-type list has the same problem (all five types
always listed, permanently zero on this board), but there turned out
to be a real tell: a top-level x.com.samsung.da.cleanLevel scalar is
present only alongside genuinely populated readings on every dump on
record (tp1x_da_ac_rac_01011, the tp1x_da_ac_air air purifier fixture)
and absent on every all-zero ARTIK051_PRAC_20K dump, including both
#166 units and the original windfree/#17 fixtures this capability was
first verified against -- which, per their /information/vs/0, turn out
to be the same board revision as #166's units, so that "verification"
never actually proved a real sensor either. AIR_QUALITY's exists_fn now
requires that scalar, and the windfree/airconditioner golden fixtures
are updated to match (those five entities no longer bind there).