Required for real hardware backends (HeaterHendi serial protocol, TempSensor_max31865 SPI interface). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SH2D4LRuCnhLSzoYerAfJX
Required for real hardware backends (HeaterHendi serial protocol, TempSensor_max31865 SPI interface). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SH2D4LRuCnhLSzoYerAfJX