init: llm wiki scaffold per Karpathy pattern

wiki/overview.md

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+# Wiki Overview
+
+## Purpose
+This wiki is a persistent, structured knowledge base built and maintained by an LLM agent.  
+It lives between raw source documents and your questions — knowledge is compiled once here, then kept current.
+
+## Architecture
+- **`raw/`** — Immutable source documents (articles, papers, notes). Never modified by the LLM.
+- **`wiki/`** — LLM-generated, interlinked markdown pages. The LLM owns this directory.
+- **`AGENTS.md`** — Schema file that defines conventions, workflows, and rules.
+
+## How to Use
+1. **Ingest**: Drop a document in `raw/`, ask the LLM to ingest it.
+2. **Query**: Ask questions. The LLM reads `index.md`, finds relevant pages, and synthesizes answers.
+3. **Lint**: Periodically ask the LLM to health-check the wiki for contradictions, orphans, and stale claims.
+
+## Topic
+*(Fill in your wiki topic here)*