acaua-task-test — integration test fixture

This is not a loadable model. It exists only to test acaua's task-metadata-routing path.

acaua supports two ways of resolving a model's task:

1. Metadata read: config.json contains an acaua_task field.
2. Fallback dict: src/acaua/_data/task_fallback.py maps repo_id to task string.

This fixture exercises path 1. Its config.json contains:

{
  "acaua_task": "detection",
  "_note": "Test fixture for acaua's metadata-routing path. Not a loadable model."
}

Integration test: tests/integration/test_task_metadata_fixture.py downloads only this config.json (tiny, no weight files), asserts acaua's task-routing dispatches to the detection adapter based on the metadata field.

No weights. No model. No inference.