All entities (weather, battery, health, native Ecowitt) now report through a
single device under the existing {(DOMAIN,)} identifier, removing the separate
"Ecowitt {model}" device that appeared whenever Ecowitt was enabled. This
collapses the previous two-device layout (and the duplicate/untranslated native
Ecowitt sensors living on the second device) into one.
The device model reflects the running station type via _station_model():
"Ecowitt <model>" when Ecowitt is active (model learned from the payload's
`model` field and stored on runtime_data.ecowitt_model), else "WSLink", else
"PWS". Device identity is centralised in data.build_device_info() and reused by
every platform.
No device-registry migration is required: the identifier is unchanged; only the
model/grouping change. Full device unification under a renamed hub is deferred
to the rename round.
Tests: device-info assertions updated to the shared device across the entity
suites; new _station_model/build_device_info branch coverage in test_data.py;
received_ecowitt now asserts the learned model. 320 passed, 100% coverage.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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