I wouldn't thank ChatGPT too enthusiastically. As always for LLMs, it has given you code that is rife with common pitfalls (because, after all, they massively plagiarize sources where people post poor code).

For examples: It does not follow the Linux rules for pathname separators, but mixes in Windows-isms. It doesn't properly check whether std::atomic<bool> is actually signal safe on the target architecture. Its unique filename generation has an all-too-common failure mode. It passes by reference only to then make local value copies anyway. It does not correctly follow the XDG Base Directory Specification.

Last time I hand started a c++ project was 10+ years ago so let's say it got the ball moving ;) Feel free to help cleanup a bit of my mess if you want, would love to work on this project together with others!