TL;DR: Andrej Karpathy's LLM Wiki is a pattern — not a product — where an LLM agent builds and maintains a structured markdown knowledge base from your raw sources. Three-layer architecture: raw/ (immutable sources), wiki/ (LLM-generated pages), and CLAUDE.md (schema). Three operations: ingest (process new sources), query (ask questions), lint (health checks). It replaces RAG with plain markdown f