devinlinux/octane — reverse-engineered prompt

I want you to turn this into a small, polished Rust project called Octane. There is basically no README, so please inspect what is already in the repo and infer a sensible direction from the existing code instead of inventing something huge. If it is meant to be a CLI tool, make it feel complete and easy to use with clear commands, helpful output, solid error messages, and sensible defaults. If it looks more like a library, make the public API clean and straightforward.

Please finish any incomplete code, clean up rough edges, add or improve tests, and make sure it builds and runs without surprises. I would also like a simple README that explains what Octane does, how to run or use it, and shows a couple of realistic examples. Keep the implementation idiomatic and lightweight, not overengineered. If you need context, feel free to check current Rust docs online, but stay close to what this repo already suggests.