Add selectable ESP-NOW send path for accel/tap input.

Expose best_effort/fast/wait/reliable via UART, dashboard, and CLI so
loss vs latency can be compared under real multi-pod load.

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

goTool/host_conn.go

@@ -4,8 +4,8 @@ import (
 	"fmt"
 	"time"
 
-	pb "powerpod/gotool/pb"
 	"google.golang.org/protobuf/proto"
+	pb "powerpod/gotool/pb"
 )
 
 // hostConn is the UART or BLE host transport used by CLI commands.
@@ -160,6 +160,33 @@ func hostSetLogLevel(h hostConn, write bool, level uint32) (*pb.SetLogLevelRespo
 	return r, nil
 }
 
+func hostInputSendMode(h hostConn, req *pb.InputSendModeRequest) (*pb.InputSendModeResponse, error) {
+	msg := &pb.UartMessage{
+		Type: pb.MessageType_INPUT_SEND_MODE,
+		Payload: &pb.UartMessage_InputSendModeRequest{
+			InputSendModeRequest: req,
+		},
+	}
+	body, err := proto.Marshal(msg)
+	if err != nil {
+		return nil, fmt.Errorf("encode: %w", err)
+	}
+	payload := append([]byte{byte(pb.MessageType_INPUT_SEND_MODE)}, body...)
+	respPayload, err := h.exchangePayload(payload, "INPUT_SEND_MODE")
+	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.GetInputSendModeResponse()
+	if r == nil {
+		return nil, fmt.Errorf("missing input_send_mode_response")
+	}
+	return r, nil
+}
+
 func hostLedRing(h hostConn, req *pb.LedRingProgressRequest) (*pb.LedRingProgressResponse, error) {
 	msg := &pb.UartMessage{
 		Type: pb.MessageType_LED_RING,