- Tag: strip all ESP-NOW/WiFi code
- Tag: add BLE GPS characteristic (def3) for iPhone binary GPS writes
- Tag: add BLE Phone IMU characteristic (def4) for iPhone IMU writes
- Tag: transmit GPS/IMU/heartbeat via DW1000 data frames (v2 protocol)
- Tag: update OLED display with GPS speed/heading/fix indicators
- Tag: e-stop now sent via UWB data frames (3x for reliability)
- Anchor: strip all ESP-NOW/WiFi code
- Anchor: receive DW1000 data frames, forward to serial as +GPS/+PIMU/+TIMU/+ESTOP
- Protocol v2: magic {0x5B, 0x02}, msg types 0x60-0x64
