Add explainability CLI tools for debugging provenance data
- tg-show-document-hierarchy: Display document → page → chunk → edge
hierarchy by traversing prov:wasDerivedFrom relationships
- tg-list-explain-traces: List all GraphRAG sessions with questions
and timestamps from the retrieval graph
- tg-show-explain-trace: Show full explainability cascade for a
GraphRAG session (question → exploration → focus → synthesis)
These tools query the source and retrieval graphs to help debug
and explore provenance/explainability data stored during document
processing and GraphRAG queries.
