Address soundness hole in cycle prevention

src/types/tests.rs

@@ -147,25 +147,3 @@ fn test_task_handle_ref_from_conversion() {
     assert_eq!(converted.id.0, 123);
     assert_eq!(handle.id, converted.id);
 }
-
-#[test]
-fn test_task_builder_ref_from_conversion() {
-    use crate::runner::DagRunner;
-
-    // Test From<&TaskBuilder> for TaskHandle (line 77-87, specifically line 83)
-    struct SimpleTask2;
-    #[crate::task]
-    impl SimpleTask2 {
-        async fn run(&self) -> String {
-            "test".to_string()
-        }
-    }
-
-    let dag = DagRunner::new();
-    let builder = dag.add_task(SimpleTask2);
-    let builder_id = builder.id;
-
-    // This conversion uses the From<&TaskBuilder> implementation
-    let handle: TaskHandle<String> = (&builder).into();
-    assert_eq!(handle.id, builder_id);
-}