Voice assistant satellite with animated face on the CoreS3 display:
- power rails, IO expander resets and servo power as in the M5 BSP
- mic and speaker share one I2S bus, so the mic is released before playback
- AW88298 volume limited to the audible range (0.5-1.0)
- partial display redraws, status screen until Home Assistant connects
- battery and wifi indicators, listening icon
- camera converted to JPEG on demand, no periodic frames
