Opus review of #149 caught that swapping is_stub_rep(rep) in for the
default field-presence gate (not just the 9 hand-audited exists_fn call
sites) was too broad: it silently excludes entities on ANY resource whose
normal, valid state includes reporting {} -- /alarms/vs/0's {} is
fridge.py's documented no-alarm state, not an absence signal, and it's not
the only one (job_beginning_status, diagnosis_status, sabbath_mode,
defrost_delay, ice_maker_enabled all lost entities on real fixtures under
the broader change). That's the opposite of #127's fix: a real fridge
would have dropped its alarm sensor on first-poll timing, not just its
phantom energy sensors.
Restored the default gate to include on either a stub or a genuinely-empty
rep -- verified byte-identical to the pre-#149 baseline across all 40
fixtures, apart from the 9 deliberately-audited exists_fn sites (energy
meter, self-check error, cooktop burner, range-hood auto-op), which are
unaffected and still fix#127. Added tests/test_entity.py exercising
_is_included directly (previously untested) and fixed two now-stale
"not rep" doc references the review also flagged.
