Whole-universe-invisible fixtures for the narrow-seeded test path (SummerTestExtension.builder().beanClasses(...), which indexes the seeds' .class bytes directly via NarrowIndexBuilder — the Quarkus ArcTestContainer beanClasses(...) model). Two kinds live here: the intentionally-broken beans for sad-path TCK tests (circular dependency, missing dependency, ambiguous resolution, self-injection) and the narrow-only positive fixtures that the whole universe must never ...