How I stopped re-explaining my project to AI tools

I keep a single markdown file with project context: stack, naming rules, current goals, and things I've already rejected. Every new chat starts by pasting it in. Sounds tedious, but it cut my correction loop almost entirely, especially for code reviews and drafting docs. Anyone else maintaining a portable context file? Curious what sections you include, and whether you keep one generic version or a separate one per client. Also wondering if there's a smarter way to sync it across tools without turning it into another maintenance chore.