If you work with Claude day after day, it builds up a memory of your work - and it turns out to be nothing fancy: a pile of plain markdown files. One index, a lot of small notes, a few rules. It's basically Karpathy's "LLM Wiki," and the interesting part is that nobody designs it. Claude's own memory nudges you into it. The thing I expected to build, and didn't I work with Claude on the same projects for weeks at a time, and the useful part is that it remembers. I can come back a week later and