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/cmd_deadzone.go

@@ -4,8 +4,6 @@ import (
 	"flag"
 	"fmt"
 
-	"google.golang.org/protobuf/proto"
-
 	"powerpod/gotool/pb"
 )
 
@@ -19,39 +17,16 @@ func runDeadzone(sp *serialPort, args []string) error {
 		return err
 	}
 
-	req := &pb.AccelDeadzoneRequest{
-		Write:       *write,
-		Deadzone:    uint32(*deadzone),
-		ClientId:    uint32(*clientID),
-		AllClients:  *all,
-	}
-	msg := &pb.UartMessage{
-		Type: pb.MessageType_ACCEL_DEADZONE,
-		Payload: &pb.UartMessage_AccelDeadzoneRequest{
-			AccelDeadzoneRequest: req,
-		},
-	}
-	body, err := proto.Marshal(msg)
-	if err != nil {
-		return fmt.Errorf("encode request: %w", err)
-	}
-
-	payload := append([]byte{byte(pb.MessageType_ACCEL_DEADZONE)}, body...)
-	respPayload, err := sp.exchangePayload(payload, "ACCEL_DEADZONE")
+	r, err := sp.accelDeadzone(&pb.AccelDeadzoneRequest{
+		Write:      *write,
+		Deadzone:   uint32(*deadzone),
+		ClientId:   uint32(*clientID),
+		AllClients: *all,
+	})
 	if err != nil {
 		return err
 	}
 
-	var respMsg pb.UartMessage
-	if err := proto.Unmarshal(respPayload[1:], &respMsg); err != nil {
-		return fmt.Errorf("decode response: %w", err)
-	}
-
-	r := respMsg.GetAccelDeadzoneResponse()
-	if r == nil {
-		return fmt.Errorf("response missing accel_deadzone_response")
-	}
-
 	fmt.Printf("deadzone=%d client_id=%d success=%v slaves_updated=%d\n",
 		r.GetDeadzone(), r.GetClientId(), r.GetSuccess(), r.GetSlavesUpdated())
 	return nil