| # retrieval | |
| Unstructured-source retrieval (PDF, DOCX, TXT) — Cu in the architecture. | |
| Dense similarity over prose chunks via PGVector. | |
| Structured (DB / tabular) sources do **not** pass through here — they go through `catalog/` + `query/`. | |
| See `ARCHITECTURE.md` (root) for the full design. | |