Add goTool autotest with bench configs and UART scenarios.

JSON configs describe network and node MACs; scenarios run command
sequences with expect checks. Share UART client API across CLI and tests.

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

goTool/main.go

@@ -15,7 +15,8 @@ func usage() {
 	fmt.Fprintf(os.Stderr, "  version   firmware version and git hash\n")
 	fmt.Fprintf(os.Stderr, "  clients   registered ESP-NOW slaves on the master\n")
 	fmt.Fprintf(os.Stderr, "  deadzone      get/set accelerometer deadzone (LSB)\n")
-	fmt.Fprintf(os.Stderr, "  unicast-test  send ESP-NOW unicast test to one slave\n\n")
+	fmt.Fprintf(os.Stderr, "  unicast-test  send ESP-NOW unicast test to one slave\n")
+	fmt.Fprintf(os.Stderr, "  test          run automated scenario (see testdata/)\n\n")
 	flag.PrintDefaults()
 }
 
@@ -47,6 +48,8 @@ func main() {
 		runErr = runDeadzone(sp, flag.Args()[1:])
 	case "unicast-test", "unicast_test":
 		runErr = runUnicastTest(sp, flag.Args()[1:])
+	case "test", "autotest":
+		runErr = runTest(sp, flag.Args()[1:])
 	default:
 		fmt.Fprintf(os.Stderr, "unknown command %q\n\n", cmd)
 		usage()