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_version.go

@@ -2,32 +2,13 @@ package main
 
 import (
 	"fmt"
-
-	"google.golang.org/protobuf/proto"
-
-	"powerpod/gotool/pb"
 )
 
 func runVersion(sp *serialPort) error {
-	payload, err := sp.exchange(byte(pb.MessageType_VERSION), "VERSION")
+	ver, err := sp.getVersion()
 	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_VERSION {
-		return fmt.Errorf("unexpected message type %v", msg.GetType())
-	}
-
-	ver := msg.GetVersionResponse()
-	if ver == nil {
-		return fmt.Errorf("response missing version_response")
-	}
-
 	fmt.Printf("version:  %d\n", ver.GetVersion())
 	fmt.Printf("git_hash: %s\n", ver.GetGitHash())
 	return nil