Check if we can configure clippy to flag `TODO` comments without authors

Let's check if we can configure clippy to flag this. Similar to what's done with `.clang-tidy` in C++ projects. Example:
<img width="922" height="37" alt="image" src="https://github.com/user-attachments/assets/c7a5fff0-27ea-44c3-b84e-e5111900f605" />

_Originally posted by @kfejzic in https://github.com/oxifix/trafix/pull/18#discussion_r2492371324_
            