chore: bootstrap project structure

.wiki/WORKFLOW.md

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+# Wiki Workflow
+
+This wiki follows Karpathy's method: knowledge accumulates rather than being re-derived.
+
+## Rules for the agent
+
+- **Before starting work** — read relevant pages from source/
+- **After an important decision** — update or create a page in source/
+- **New raw materials** (links, docs, transcripts) — put in raw/
+- **Processed knowledge** — write as markdown pages in source/
+- **SUMMARY.md** — update whenever a page is added to source/
+
+## Trigger
+
+Skill is activated by the phrase: **use project wiki**