Add runtime BMA456 tap config with NVS persistence and goTool UI.

Expose multitap parameters over UART/ESP-NOW (like deadzone), store per node in NVS, and allow get/set from CLI, REST, and the dashboard without poll-overwrite while editing.

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

goTool/client_api.go

@@ -225,6 +225,27 @@ func (m *managedSerial) AccelDeadzonePoll(req *pb.AccelDeadzoneRequest) (*pb.Acc
 	return m.accelDeadzoneVia(m.withPortPoll, req)
 }
 
+func (m *managedSerial) TapConfig(req *pb.TapConfigRequest) (*pb.TapConfigResponse, error) {
+	return m.tapConfigVia(m.withPort, req)
+}
+
+func (m *managedSerial) TapConfigPoll(req *pb.TapConfigRequest) (*pb.TapConfigResponse, error) {
+	return m.tapConfigVia(m.withPortPoll, req)
+}
+
+func (m *managedSerial) tapConfigVia(
+	portFn func(func(*serialPort) error) error,
+	req *pb.TapConfigRequest,
+) (*pb.TapConfigResponse, error) {
+	var resp *pb.TapConfigResponse
+	err := portFn(func(sp *serialPort) error {
+		var e error
+		resp, e = sp.TapConfig(req)
+		return e
+	})
+	return resp, err
+}
+
 func (m *managedSerial) accelDeadzoneVia(
 	portFn func(func(*serialPort) error) error,
 	req *pb.AccelDeadzoneRequest,
@@ -383,6 +404,33 @@ func (s *serialPort) accelDeadzone(req *pb.AccelDeadzoneRequest) (*pb.AccelDeadz
 	return r, nil
 }
 
+func (s *serialPort) tapConfig(req *pb.TapConfigRequest) (*pb.TapConfigResponse, error) {
+	msg := &pb.UartMessage{
+		Type: pb.MessageType_TAP_CONFIG,
+		Payload: &pb.UartMessage_TapConfigRequest{
+			TapConfigRequest: req,
+		},
+	}
+	body, err := proto.Marshal(msg)
+	if err != nil {
+		return nil, fmt.Errorf("encode: %w", err)
+	}
+	payload := append([]byte{byte(pb.MessageType_TAP_CONFIG)}, body...)
+	respPayload, err := s.exchangePayload(payload, "TAP_CONFIG")
+	if err != nil {
+		return nil, err
+	}
+	var respMsg pb.UartMessage
+	if err := proto.Unmarshal(respPayload[1:], &respMsg); err != nil {
+		return nil, fmt.Errorf("decode: %w", err)
+	}
+	r := respMsg.GetTapConfigResponse()
+	if r == nil {
+		return nil, fmt.Errorf("missing tap_config_response")
+	}
+	return r, nil
+}
+
 func (s *serialPort) espnowUnicastTest(clientID, seq uint32) (*pb.EspNowUnicastTestResponse, error) {
 	req := &pb.EspNowUnicastTestRequest{ClientId: clientID, Seq: seq}
 	msg := &pb.UartMessage{
@@ -557,6 +605,10 @@ func (s *serialPort) AccelDeadzone(req *pb.AccelDeadzoneRequest) (*pb.AccelDeadz
 	return s.accelDeadzone(req)
 }
 
+func (s *serialPort) TapConfig(req *pb.TapConfigRequest) (*pb.TapConfigResponse, error) {
+	return s.tapConfig(req)
+}
+
 func (s *serialPort) EspnowUnicastTest(clientID, seq uint32) (*pb.EspNowUnicastTestResponse, error) {
 	return s.espnowUnicastTest(clientID, seq)
 }