Vector memory answers "what is this like." Graph memory answers "what is connected to this." Production brains often need both. gbrain is a real-world example: search, typed edges at ingest, and synthesis (`think`). gstack is the sibling Claude Code toolkit for how the coding agent works.

The Week 5 lab uses a local equivalent of the same ideas (vector vs graph on sample notes). Install gbrain later if you want the full tool. For knowledge-as-files, see the Karpathy llm-wiki gist and OKF.