fix: resolve CI linting and type checking errors

scaffoldforge/templates/rust/default/lib.rs.j2

@@ -1,10 +1,6 @@
-// Library code for {{ project_name }}
+// Library code for {{ project_name }}.
 // Generated from GitHub Issue #{{ issue_number }}
 
-{% for item in todo_items %}
+// {% for item in todo_items %}
 // TODO #{{ loop.index }}: {{ item }}
-{% endfor %}
-
-pub fn helper_function() {
-    // TODO: Implement
-}
+// {% endfor %}