What graph adds that ChromaDB cannot

Vector retrieval is great when the answer lives in a single passage. The moment a question asks "who connects A to B" or "which company owns the parent of X", similarity collapses. The graph traverses relationships explicitly, so a hop is a query, not a guess.

Because vectors win on the long tail of single-passage questions, where graph extraction may not have surfaced the exact phrasing the user asked for. The point of running both side by side is to learn which question shapes go to which retriever, then route accordingly. The hybrid module turns that intuition into code.