Vibe coders, How do you document your past implementations?

I’m curious! How do you document the different iterations of your app so you can revisit them later for enhancements or debugging?

Do you stick to traditional docs, use wikis, or something more creative?

As a solo dev, my app is getting bigger and more complex with multiple automations and moving parts, and I often struggle to remember all the implementation details. Do you also save the prompts you used to develop certain features, or have your own system for keeping track?