Route an incoming record/fact into the correct graph of the Three-Graph
Architecture (Ch3) — DOMAIN (trusted, entity-resolved single source of
truth), LEXICAL (verbatim source text with provenance, the "retrieval" in
RAG), or SUBJECT (LLM-extracted artifacts kept SEPARATE from domain until
entity resolution links them). The router enforces the boundaries that make
the architecture work — an extraction can NEVER be written straight into the
domain graph; it must enter subject and link via CORRESPONDS_TO above a
confidence threshold (default 0.85). Use when ingesting
mixed structured + unstructured data into an agent knowledge graph, when
designing the separation between tr…
