fix(airconditioner): scale legacy ARTIK051 cumulativePower correctly (#193)

ARTIK051_KRAC_18K-generation boards report /energy/consumption/vs/0's
cumulativePower in centiwatt-hours, not the plain Wh every other AC board
family reports -- confirmed against the reporter's own SmartThings-app
reading (raw 117430000 vs. the app's authoritative 1,174.30 kWh is exactly
a /100000 factor, not the shared wh_to_kwh's /1000 alone). Split
common.ENERGY_METER into generic/legacy variants on the airconditioner
registry, discriminated by the existing is_legacy_board() check, so every
other AC family keeps the unmodified shared capability.

custom_components/localthings/registry/by_type/airconditioner.py

@@ -7,6 +7,13 @@ this registry includes *common.UNIVERSAL but deliberately NOT common.POWER --
 on/off is the climate entity's HVACMode.OFF / TURN_ON/OFF. See common.POWER's
 own comment in capabilities/common.py for why it's excluded.
 
+common.ENERGY_METER itself is also excluded from UNIVERSAL here, replaced by
+the ENERGY_METER_GENERIC/ENERGY_METER_LEGACY pair -- the legacy ARTIK051 board
+generation (issue #193) reports cumulativePower in a different unit than
+every other AC family, so this registry needs two mutually-exclusive variants
+of that one capability instead of the single shared one every other registry
+uses unconditionally.
+
 Reuses dishwasher.DIAGNOSIS for /diagnosis/vs/0.
 """
 from ..capabilities import airconditioner, common, dishwasher, ignored
@@ -16,7 +23,9 @@ REGISTRY = DeviceRegistry(
     name='airconditioner',
     capabilities=_build([
         *ignored.IGNORED,
-        *common.UNIVERSAL,
+        *[c for c in common.UNIVERSAL if c is not common.ENERGY_METER],
+        airconditioner.ENERGY_METER_GENERIC,
+        airconditioner.ENERGY_METER_LEGACY,
         dishwasher.DIAGNOSIS,
         airconditioner.CLIMATE,
         airconditioner.AIR_PURIFY,

custom_components/localthings/registry/capabilities/airconditioner.py

@@ -14,10 +14,13 @@ None of these caps may go into the global `ALL`/`CAPABILITIES`: `/mode/vs/0`,
 different schema (see capabilities/__init__.py). They live only in the AC
 by_type registry.
 """
+from dataclasses import replace
+
 from ..capability import Capability
 from ..entities import (
     BinarySensorDesc, ClimateDesc, NumberDesc, SelectDesc, SensorDesc, SwitchDesc,
 )
+from . import common
 from .common import filter_usage_percent, normalize_temp_unit
 from .laundry import option_write
 
@@ -296,6 +299,44 @@ def is_legacy_board(resources):
     return HREF_AIRFLOW in resources and HREF_WIND_STRENGTH not in resources
 
 
+# This legacy ARTIK051 board generation (issue #193, model AR12NXWXCWKNEU /
+# ARTIK051_KRAC_18K) reports /energy/consumption/vs/0's cumulativePower in
+# centiwatt-hours -- raw value 100x the plain Wh every other AC board family
+# (and common.wh_to_kwh's assumed unit) reports. Confirmed against the
+# reporter's own SmartThings-app reading: raw '117430000' vs the app's
+# authoritative 1,174.30 kWh is exactly a /100000 factor (i.e. /100 on top of
+# wh_to_kwh's own /1000), not wh_to_kwh's plain /1000 alone. No other field in
+# ENERGY_METER's entities is present on this board's dump, so only
+# 'energy_kwh' needs a replacement value_fn here; the rest pass through
+# unchanged in case a future legacy dump ever reports them.
+def _legacy_cumulative_power_kwh(v):
+    n = _int(v)
+    return round(n / 100000.0, 2) if n is not None else None
+
+
+ENERGY_METER_LEGACY = Capability(
+    href=common.ENERGY_METER.href,
+    poll_tier=common.ENERGY_METER.poll_tier,
+    match_fn=lambda rep, resources: is_legacy_board(resources),
+    entities=tuple(
+        replace(e, value_fn=_legacy_cumulative_power_kwh)
+        if e.key == 'energy_kwh' else e
+        for e in common.ENERGY_METER.entities
+    ),
+)
+
+# The non-legacy counterpart to ENERGY_METER_LEGACY above -- identical to
+# common.ENERGY_METER, just excluding the legacy board generation so the two
+# capabilities can share /energy/consumption/vs/0 in this registry without
+# the 'multiple caps need a discriminator' build check tripping (common.
+# ENERGY_METER itself has no match_fn, since every *other* registry includes
+# it unconditionally and alone).
+ENERGY_METER_GENERIC = replace(
+    common.ENERGY_METER,
+    match_fn=lambda rep, resources: not is_legacy_board(resources),
+)
+
+
 def _has_option_token(prefix):
     return lambda rep, resources: (
         is_legacy_board(resources) and _option_token(rep, prefix) is not None)