OpenBSD, a rather more complex project, seems to be doing fine without a code of conduct — in the sense bakugo employed "code of conduct," not in the generalized sensed you conflated it with in your non sequitur.
I mean, I like openbsd the product, but the community culture is notoriously terrible and unwelcoming to newbies.
OpenBSD has a "netiquette" doc for its mailing lists: https://www.openbsd.org/mail.html
Not sure if you want to count it as a "code of conduct", but it certainly defines rules on how to communicate and contribute to the project.