Dropping native_min to 0 fixed the read range and quietly opened a write:
native_min governs what the user can enter, not just what renders, so 0
became enterable and would have gone out as periodicSensingInterval "0".
Nothing establishes what that does to this board -- both fixtures report 600,
the app's smallest choice is 10 min, and 60 s is the lowest value confirmed
accepted. The two precedents leaned on differ in exactly the way that matters:
oven.cook_time and operational.delay_start_hours sit at a zero floor under a
value where 0 is a real setting ("no timer", "no delay").
One minute is also the resolution this board reports results at.
lastSensingTime lands on an exact minute on every sample from the AVT-WW-TP1
and A-VTWW-TP2 boards -- both fixtures, plus eleven consecutive live readings
-- where the TP1X/AC/hood boards report arbitrary seconds. A sub-minute
interval is unobservable here whether or not the board honours it.
So native_min goes to 1 rather than 0, and the read rounds up instead of to
nearest so a sub-minute reading renders as 1 rather than falling below the
entity's own floor. The write still refuses anything under a minute -- a None
return, the silent no-op range_hood._lamp_level_write uses for a level the
device didn't advertise -- since native_min only guards the UI path, not a
service call.
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