salty d687ef5242 feat: bidirectional ESP-NOW — anchors share ranges with each other + tag
Anchors:
- Broadcast own range via ESP-NOW after each TWR cycle
- Receive other anchor's range via ESP-NOW, print as +RANGE on serial
- Either anchor's serial port gives Orin BOTH ranges (only need 1 USB/UART)

Tag:
- Receives ESP-NOW from both anchors
- Updates display with both A0 + A1 distances regardless of DW1000 pairing
- Solves the 'only sees A0' display issue
2026-03-14 13:25:18 -04:00
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