i turned a folder of markdown into a coworker that actually knows me

Most people's notes are where ideas go to die. a notion page you never open again. a notes app with 400 untitled entries. screenshots you saved and forgot. i had all of that. so i built a second brain. it's a folder of plain markdown files that an AI reads, writes to, and thinks with. no fancy app. no subscription. just files and a model that knows the whole folder. here's why i actually use it, and how it works. why it's useful (the honest part) the real reason this exists: i was tired of re-explaining myself to a chatbot every single time.