"The only thing I haven't found is something to enforce error handling."
errcheck, generally as manifested in golangci-lint, ensures you can't forget to do something with them. It would be odd for you to know about forbidigo but not errcheck as the former is much less widely known; is there something that errcheck doesn't do for you?
It's worth pointing out that "discard this error on purpose" is a legitimate form of error handling, so "enforce error handling" can't really constitute banning that. That's not a Go statement, that's just true in general... it is sometimes valid to just ignore the error, because there's nothing useful to do with it anyhow. I would agree the ignoring should be explicit, but it is an option.
The rule I set for linting when an LLM is writing code is: Either you adhere to the rules, or you mark an exception with a valid reason.
https://github.com/kstenerud/yoloai/blob/main/docs/contribut...
Poor defaults break systems by a thousand cuts. They seem to make sense when designing the language (more convenient, less typing, etc), but then they very quickly become liabilities as project complexity increases. Go made the mistakes of mutable-by-default and silent-error-dropping, but their cyclical-import-forbidding was a good call.