- Add ID? command to firmware: server responds 'SylDa_Server', client 'SylDa_Client'
- Add tools/pio_upload_port.py POST-script that queries connected ESP32s
- Remove hardcoded upload_port from platformio.ini
- Script logic: 1 ESP32 → use directly, 2+ → ID? query, no match → prompt user
- Requires pyserial for serial queries (graceful fallback if missing)