- Update SPARQL CONSTRUCT query to use correct ontology namespaces:
- hc: https://w3id.org/heritage/custodian/ (was nde)
- Use nde:Custodian type (was crm:E39_Actor)
- Use schema:location + geo:lat/long (was crm predicates)
- Remove LIMIT 500 clause to fetch all results
- Show all node types by default instead of random single type
- Fixes issue where Knowledge Graph showed incomplete/random data
- Implemented `owl_to_mermaid.py` to convert OWL/Turtle files into Mermaid class diagrams.
- Implemented `owl_to_plantuml.py` to convert OWL/Turtle files into PlantUML class diagrams.
- Added two new PlantUML files for custodian multi-aspect diagrams.
