It would be helpful to see an example DESIGN and ARCHITECTURE file.

it really depends on a project. I'm doing a computer game and design was just a bunch of ideas and mechanics around it.

Hey there. I've been hacking on a bigger project (10k+ LOC) using an LLM as a coding tool. Wrote up how I keep it from melting down with design docs + a living coding-guidelines file — might help if you’re trying to do something bigger consistently.