How I built a CLI tool in Rust that uses AI to brief you on your git state

I built rewind — a CLI that reads your git repo and tells you in plain english where you left off. But the interesting part isn't what it does, it's how it actually works under the hood. The core problem with context The naive approach would be to just dump your entire git history into an LLM and ask it to summarize. That works but it's wasteful and noisy. A repo with 500 commits would burn through tokens on irrelevant history. So rewind only collects what's actually relevant right now: Current