Level 1 tests validate each vector store's search() returns similarity
scores (higher = better) with correct ordering using known vectors.
Level 2 tests validate the full Memory.add() + Memory.search(threshold=...)
pipeline end-to-end. Both levels are standalone scripts run via CLI args
(e.g., `python test_score_normalization.py faiss`), not collected by pytest.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
