OKF Representation of Property Graph DB Model

Agentic GraphRAG KG's (especially over the property graph DB) would just need to have fields mapped the OKF and a single prompt can have the graph DB write itself as an OKF graph. Like the agent it ships with.

The issue names no files, tests, or entry points. First clarify which property graph database and OKF fields are in scope, and how the Agentic GraphRAG workflow should perform the mapping. Done should include an agreed mapping and a defined way for the graph database to produce an OKF graph.

Written by the indexing model from the issue text.