Robot-side firmware (Teensy 4.0) imported unchanged as extracted. platformio.ini defines [env:robot] (teensy40) and [env:remote] (teensy41); scripts/select_src_dir.py points each env at its own sketch folder so robot/ and remote/ stay Arduino-style sketches. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>