fix: fridge/washer coverage gaps from the #19-#27 dump batch

Six new diagnostics dumps, six gaps closed:

- refrigerator: bind /diagnosis/vs/0 (reuse dishwasher.DIAGNOSIS -- same
  shape) into the refrigerator registry; it was never wired up there,
  tripping the coverage repair on any fridge that reports it (#20, #26).
- refrigerator: add PANTRY_ZONE for the Cool Select Zone pantry compartment
  (/status/pantry/one/vs/0, x.com.samsung.da.mode/supportedOptions) -- same
  shape as BEVERAGE_ZONE but a distinct resource/field set (#20).
- refrigerator: generalize FLEX_ZONE to identify the current mode by list
  membership in supportedOptions instead of a hardcoded
  CV_TTYPE_RF9000A_ prefix check. TP1X/Bespoke-class fridges use a
  CV_FDR_ prefix instead, which the old code didn't recognize -- the
  select existed but always read as unknown, and writing to it would have
  appended a duplicate CV_FDR_ flag rather than replacing the existing one
  (#26, #27; also closes #32).
- common: add energy_saved_kwh (x.com.samsung.da.cumulativeSavedPower) and
  power_energy_kwh (x.com.samsung.da.cumulativeConsumption) to the shared
  energy meter, plus fridge-only energy_last_month_kwh/energy_this_month_kwh
  (monthlyConsumption/thismonthlyConsumption) -- all self-gating on field
  presence (#26).
- by_type: add the WV consumer-model prefix (FlexWash twin washers, e.g.
  WV55M9600AW) to the by-model fallback map. These report no oneUiVersion
  and previously matched no prefix at all, so they fell all the way
  through to the unrecognized-device registry with zero capabilities
  bound (#19).
- washer: add a self-gating dry_level select to WASHER_SETTINGS for
  washer/dryer combo units, which carry a writable dryLevel field
  directly on /washer/vs/0 with no separate dryer resource or course
  (#22).

The reset-water-filter button and "ice type vs. two named icemakers"
requests from #26/#27 are left alone -- no write contract or exclusivity
behavior is evidenced in either dump, and both icemakers report On
simultaneously on the Bespoke unit, so synthesizing a single-select would
be a guess rather than a fix.

Adds scrubbed fixtures + goldens for FlexWash, a washer/dryer combo,
ARTIK051_REF_17K, and TP2X_REF_20K, plus unit tests for the new/changed
capabilities.

tests/test_fridge_capabilities.py

@@ -104,6 +104,43 @@ class TestRefrigerationFallback:
             assert desc.exists_fn({}, {'/refrigeration/0': {}}) is True
 
 
+class TestFlexZone:
+    """Issue #32 (surfaced by #26/#27's TP2X/Bespoke dumps): the flex-zone
+    entry's prefix varies by fridge family (CV_TTYPE_RF9000A_ on RF9000-class,
+    CV_FDR_ on TP1X/Bespoke-class). The old hardcoded-prefix match left
+    CV_FDR_-family fridges with an always-unknown select, and a write would
+    have appended a duplicate flag instead of replacing the existing one."""
+
+    def test_reads_rf9000_prefix(self):
+        rep = {
+            'x.com.samsung.da.modes': ['CV_TTYPE_RF9000A_BEVERAGE', 'WATERFILTER_DISABLE'],
+            'x.com.samsung.da.supportedOptions': [
+                'CV_TTYPE_RF9000A_FREEZE', 'CV_TTYPE_RF9000A_BEVERAGE'],
+        }
+        assert fridge._flex_zone_current(rep) == 'CV_TTYPE_RF9000A_BEVERAGE'
+
+    def test_reads_cv_fdr_prefix(self):
+        rep = {
+            'x.com.samsung.da.modes': ['CVN_CONVERTIBLE_ZONE', 'CV_FDR_MEAT', 'WATERFILTER_ENABLE'],
+            'x.com.samsung.da.supportedOptions': [
+                'CV_FDR_WINE', 'CV_FDR_DELI', 'CV_FDR_BEVERAGE', 'CV_FDR_MEAT'],
+        }
+        assert fridge._flex_zone_current(rep) == 'CV_FDR_MEAT'
+
+    def test_write_replaces_rather_than_duplicates(self):
+        rep = {
+            'x.com.samsung.da.modes': ['CVN_CONVERTIBLE_ZONE', 'CV_FDR_MEAT', 'WATERFILTER_ENABLE'],
+            'x.com.samsung.da.supportedOptions': [
+                'CV_FDR_WINE', 'CV_FDR_DELI', 'CV_FDR_BEVERAGE', 'CV_FDR_MEAT'],
+        }
+        path, payload = fridge._flex_zone_write('CV_FDR_WINE', rep)
+        assert path == ['mode', 'vs', '0']
+        modes = payload['x.com.samsung.da.modes']
+        assert modes.count('CV_FDR_WINE') == 1
+        assert 'CV_FDR_MEAT' not in modes
+        assert 'CVN_CONVERTIBLE_ZONE' in modes and 'WATERFILTER_ENABLE' in modes
+
+
 class TestTp1xNativeDuplicateResources:
     """The US TP1X_REF_21K publishes two native mirrors in addition to the
     richer vendor resources.  They must count as covered without producing
@@ -134,3 +171,60 @@ class TestTp1xNativeDuplicateResources:
         assert 'ice_maker_enabled' not in state
         assert state['icemaker_one_enabled'] is True
         assert state['icemaker_two_enabled'] is True
+
+
+class TestPantryZone:
+    """Cool Select Zone pantry compartment on ARTIK051_REF_17K -- issue #20."""
+
+    def test_href(self):
+        assert fridge.PANTRY_ZONE.href == '/status/pantry/one/vs/0'
+
+    def test_write(self):
+        desc = fridge.PANTRY_ZONE.entities[0]
+        path, body = desc.write_fn('FDR_WINE', {})
+        assert path == ['status', 'pantry', 'one', 'vs', '0']
+        assert body == {'x.com.samsung.da.mode': 'FDR_WINE'}
+
+
+class TestArtik051AndTp2xFixturesHaveCompleteCoverage:
+    """issue #20 (ARTIK051_REF_17K) and #26 (TP2X_REF_20K) both triggered
+    the incomplete-capability-coverage repair; both must resolve to zero
+    unbound hrefs now that /diagnosis/vs/0 (dishwasher.DIAGNOSIS, reused for
+    fridges), /status/pantry/one/vs/0 (PANTRY_ZONE), and the OCF-native
+    defrost/icemaker mirrors are covered."""
+
+    def test_artik051_ref_17k(self):
+        from custom_components.localthings.registry.adapter import flatten
+        from custom_components.localthings.registry.by_type import refrigerator
+        from custom_components.localthings.registry.discovery import discover
+        from tests.conftest import _load_device
+
+        resources = _load_device('refrigerator_artik051_ref_17k')
+        unbound = []
+        bound = discover(
+            resources,
+            refrigerator.REGISTRY.capabilities,
+            refrigerator.REGISTRY.pattern_capabilities,
+            log=unbound.append,
+        )
+        assert unbound == []
+        state = flatten(bound, resources)
+        assert state['pantry_zone_mode'] == 'FDR_DRINKS'
+
+    def test_tp2x_ref_20k(self):
+        from custom_components.localthings.registry.adapter import flatten
+        from custom_components.localthings.registry.by_type import refrigerator
+        from custom_components.localthings.registry.discovery import discover
+        from tests.conftest import _load_device
+
+        resources = _load_device('refrigerator_tp2x_ref_20k')
+        unbound = []
+        bound = discover(
+            resources,
+            refrigerator.REGISTRY.capabilities,
+            refrigerator.REGISTRY.pattern_capabilities,
+            log=unbound.append,
+        )
+        assert unbound == []
+        state = flatten(bound, resources)
+        assert state['flex_zone_mode'] == 'CV_FDR_BEVERAGE'