Like most modern languages, Rust has its own build system and package manager, Cargo. Everything you're referring to relates to that, and has nothing to do with LLM coding.

Edit: saw the clarification in another comment. But, in that case the essential point seems to be "I'm not familiar with something, therefore it's suspect."

`Cargo.lock` is a lockfile machine generated by Cargo. It's similar to package-lock.json. In any case, its machine generated the old fashioned way.

> I love llm coding. I don't know what I am looking at here

There might be some correlation here.