Add dynamic UART/BLE host connect for serve, dashboard, and WS.

Serve starts without a required port; REST/WS/UI can scan and switch transports, with BLE live ticks and UART-only OTA.

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

goTool/main.go

@@ -27,7 +27,7 @@ func usage() {
 	fmt.Fprintf(os.Stderr, "  ble-rtt       Host↔Master RTT via VERSION (N samples)\n")
 	fmt.Fprintf(os.Stderr, "  ble-stream    enable stream + measure BleStreamTick window\n")
 	fmt.Fprintf(os.Stderr, "  test          run automated scenario (see testdata/)\n")
-	fmt.Fprintf(os.Stderr, "  serve         web dashboard (UART only)\n")
+	fmt.Fprintf(os.Stderr, "  serve         web dashboard (optional -port / -ble; connect from UI)\n")
 	fmt.Fprintf(os.Stderr, "  ota           UART OTA upload (A/B partitions; UART host only)\n")
 	fmt.Fprintf(os.Stderr, "  ota-progress  query per-slave ESP-NOW OTA progress on master\n")
 	fmt.Fprintf(os.Stderr, "  led-ring      set LED ring progress bar (0–100%%, rgb, intensity)\n")
@@ -61,16 +61,17 @@ func main() {
 		}
 		runErr = runTest(*portName, *baud, flag.Args()[1:])
 	case "serve", "web", "dashboard":
-		if *useBLE {
-			fmt.Fprintf(os.Stderr, "serve requires -port (UART only in this release)\n")
+		if *useBLE && *portName != "" {
+			fmt.Fprintf(os.Stderr, "use either -port or -ble, not both\n")
 			os.Exit(2)
 		}
-		if *portName == "" {
-			fmt.Fprintf(os.Stderr, "command %q requires -port\n\n", cmd)
-			usage()
-			os.Exit(2)
-		}
-		runErr = runServe(*portName, *baud, flag.Args()[1:])
+		runErr = runServe(serveOpts{
+			portName: *portName,
+			baud:     *baud,
+			useBLE:   *useBLE,
+			bleName:  *bleName,
+			settle:   time.Duration(*bleSettle * float64(time.Second)),
+		}, flag.Args()[1:])
 	case "version", "clients", "client-info", "deadzone", "accel-deadzone", "tap-config", "tap_config", "tap-notify", "tap_notify", "cache-status", "cache_status", "accel-stream", "accel_stream", "unicast-test", "unicast_test", "echo-ping", "echo_ping", "ble-rtt", "ble_rtt", "ble-stream", "ble_stream", "led-ring", "led_ring", "find-me", "find_me", "restart", "log-level", "log_level", "ota", "ota-progress", "ota_progress":
 		if *useBLE && *portName != "" {
 			fmt.Fprintf(os.Stderr, "use either -port or -ble, not both\n")