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_unicast.go

@@ -3,10 +3,6 @@ package main
 import (
 	"flag"
 	"fmt"
-
-	"google.golang.org/protobuf/proto"
-
-	"powerpod/gotool/pb"
 )
 
 func runUnicastTest(sp *serialPort, args []string) error {
@@ -20,37 +16,11 @@ func runUnicastTest(sp *serialPort, args []string) error {
 		return fmt.Errorf("client id required (see `gotool clients`)")
 	}
 
-	req := &pb.EspNowUnicastTestRequest{
-		ClientId: uint32(*clientID),
-		Seq:      uint32(*seq),
-	}
-	msg := &pb.UartMessage{
-		Type: pb.MessageType_ESPNOW_UNICAST_TEST,
-		Payload: &pb.UartMessage_EspnowUnicastTestRequest{
-			EspnowUnicastTestRequest: req,
-		},
-	}
-	body, err := proto.Marshal(msg)
-	if err != nil {
-		return fmt.Errorf("encode request: %w", err)
-	}
-
-	payload := append([]byte{byte(pb.MessageType_ESPNOW_UNICAST_TEST)}, body...)
-	respPayload, err := sp.exchangePayload(payload, "ESPNOW_UNICAST_TEST")
+	r, err := sp.espnowUnicastTest(uint32(*clientID), uint32(*seq))
 	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.GetEspnowUnicastTestResponse()
-	if r == nil {
-		return fmt.Errorf("response missing espnow_unicast_test_response")
-	}
-
 	fmt.Printf("unicast test sent: success=%v seq=%d\n", r.GetSuccess(), r.GetSeq())
 	return nil
 }