Add runtime UV protection toggle and treat near-zero sense as external power.

Per-pod NVS enable (default off) via UART/ESP-NOW/dashboard, and skip UV latch when LiPo ADC reads ~0 mV so USB/external supply still boots.

Co-authored-by: Cursor <cursoragent@cursor.com>

goTool/main.go

@@ -35,6 +35,7 @@ func usage() {
 	fmt.Fprintf(os.Stderr, "  find-me       blink LED ring red/green/blue (3× each, full brightness)\n")
 	fmt.Fprintf(os.Stderr, "  restart       reboot master or slave (ESP-NOW)\n")
 	fmt.Fprintf(os.Stderr, "  log-level     get/set master ESP-IDF log level (global)\n")
+	fmt.Fprintf(os.Stderr, "  battery-uv    get/set software LiPo UV protection (per pod / all)\n")
 	fmt.Fprintf(os.Stderr, "  input-send-mode  get/set slave accel/tap ESP-NOW send path\n\n")
 	flag.PrintDefaults()
 }
@@ -138,6 +139,13 @@ func main() {
 				break
 			}
 			runErr = runTapConfig(sp, flag.Args()[1:])
+		case "battery-uv", "battery_uv":
+			sp, ok := h.(*serialPort)
+			if !ok {
+				runErr = fmt.Errorf("%s over BLE not wired yet; use -port", cmd)
+				break
+			}
+			runErr = runBatteryUv(sp, flag.Args()[1:])
 		case "tap-notify", "tap_notify":
 			sp, ok := h.(*serialPort)
 			if !ok {