- Update HeritageSPARQLGenerator docstring with correct prefixes
- Change main class from hc:Custodian to crm:E39_Actor
- Change type property from hcp:institutionType to org:classification
- Update type values from single letters to full names (MUSEUM, ARCHIVE, etc.)
- Add rate limit handling with exponential backoff for 429 errors
- Fix test_live_rag.py sample queries to use correct ontology
- Update optimized_models instructions with correct prefixes