0.6.2

No breaking changes.

• TemperatureLevelMixin/HumidityLevelMixin/PowerMeterMixin/
  CommunicationQualityMixin (existing capability mixins backing several
  device classes) are now exported from boschshcpy/__init__.py, matching
  every other public capability/device type. Lets consumers type against
  the capability instead of a specific device class.
• SHCSessionAsync/SHCSession.unique_id — a convenience passthrough to
  self.information.unique_id, now typed as non-optional str (raises if
  called before the session has actually authenticated, instead of forcing
  every caller to null-check something that's always present post-setup).
• SHCTwinguard aligned with the mixins it already structurally satisfies.