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_clients.go

@@ -3,33 +3,13 @@ package main
 import (
 	"encoding/hex"
 	"fmt"
-
-	"google.golang.org/protobuf/proto"
-
-	"powerpod/gotool/pb"
 )
 
 func runClients(sp *serialPort) error {
-	payload, err := sp.exchange(byte(pb.MessageType_CLIENT_INFO), "CLIENT_INFO")
+	clients, err := sp.listClients()
 	if err != nil {
 		return err
 	}
-
-	var msg pb.UartMessage
-	if err := proto.Unmarshal(payload[1:], &msg); err != nil {
-		return fmt.Errorf("decode protobuf: %w", err)
-	}
-
-	if msg.GetType() != pb.MessageType_CLIENT_INFO {
-		return fmt.Errorf("unexpected message type %v", msg.GetType())
-	}
-
-	info := msg.GetClientInfoResponse()
-	if info == nil {
-		return fmt.Errorf("response missing client_info_response")
-	}
-
-	clients := info.GetClients()
 	if len(clients) == 0 {
 		fmt.Println("no clients registered")
 		return nil