Author here. No vibe-coding, all human-written. Are you thinking of my use of GitHub emoji on the section headings in the README? I just found they helped my eye pick out the headings a little more easily and I'd seen some other nice READMEs at the time do that sort of thing when I went looking for examples to pattern it off of. I swear I'd had no idea it would become an LLM thing!

The README is older than ChatGPT too. It's very unlikely that it's vibe coded or vibe written.