FUE-T07: use meter label directly as energy-cost HA device name (drop 'Energy Cost' prefix)

tests/test_energy_expose.py

@@ -869,7 +869,7 @@ def test_energy_entity_discovery_topics_contain_correct_node_id() -> None:
     # identifiers[1] = meter uuid — this is what FUE-T05 sets.
     device = DeviceInfo(
         identifiers=("energy-cost", meter_uuid),
-        name="Energy Cost (Test Meter)",
+        name="Test Meter",
         provides_availability=False,
     )
     entity = ExposableEntity(
@@ -2288,8 +2288,8 @@ def test_energy_cost_provider_identifiers_match_meter_uuid(energy_db) -> None:
             f"expected ('energy-cost', {meter_uuid!r}), "
             f"got {entity.device.identifiers!r}"
         )
-        assert meter_label in entity.device.name, (
-            f"device.name must contain meter label {meter_label!r}, "
+        assert entity.device.name == meter_label, (
+            f"device.name must be exactly the meter label {meter_label!r}, "
             f"got {entity.device.name!r}"
         )