[zigpy-review-bot]

Summary

The thermostat HVAC action sensor (ThermostatHVACAction, and SinopeHVACAction which subclasses it) reported HVACAction string states but was a plain sensor, so Home Assistant didn't know the possible states. It is now an enum sensor whose options are the HVACAction values (cooling, defrosting, drying, fan, heating, idle, off, preheating).

Fixes #1012

Changes

• ThermostatHVACAction gets SensorDeviceClass.ENUM and an options property, and exposes them through EnumSensorState. EnumSensor isn't reused as a base because its options are enum names and its formatter maps ints to names; the options here are the lowercase values.
• The sensor has no state class, so the device class change doesn't affect long-term statistics. No HA Core change is needed beyond the zha bump.
• The 81 device snapshots containing this entity are regenerated; the only diff is device_class: null → "enum" and the added options list.

Testing

• Added assertions on the device class and options to test_climate_hvac_action_running_state.
• Full test suite and pre-commit (incl. mypy) pass.
• One Opus review round (no code findings; the shared class-level options list was copied per read); no Copilot pass.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.49%. Comparing base (2da1a5b) to head (fbd7f30).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1013   +/-   ##
=======================================
  Coverage   97.48%   97.49%           
=======================================
  Files          61       61           
  Lines       10870    10878    +8     
=======================================
+ Hits        10597    10605    +8     
  Misses        273      273           

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