Karpathy's LLM Wiki pattern, built step by stepClaude sitting on an Obsidian vault that holds everything you know. you stop re-explaining yourself every session because the system already remembers.> your data stays plain text on your machine> point any model at it next year and it still works> it gets sharper every day you feed itone evening of setup for a second brain that maintains itself.full nine-step build in the article below