claudetool: add go mod tidy check to codereview

Co-Authored-By: sketch <hello@sketch.dev>
diff --git a/claudetool/codereview/codereview_test.go b/claudetool/codereview/codereview_test.go
index 29e05ec..aa7b8f1 100644
--- a/claudetool/codereview/codereview_test.go
+++ b/claudetool/codereview/codereview_test.go
@@ -272,7 +272,7 @@
 	if err != nil {
 		return nil, fmt.Errorf("error creating code reviewer: %w", err)
 	}
-	formattedFiles := reviewer.Autoformat(ctx)
+	formattedFiles := reviewer.autoformat(ctx)
 	normalizedFiles := make([]string, len(formattedFiles))
 	for i, file := range formattedFiles {
 		normalizedFiles[i] = normalizePaths(file, dir)