Not very many lint rules are turned on

`oxlint` was integrated in #328, but I could barely turn on any lint rules. This repo hasn't had linting in CI since probably the beginning, so there are lint violations to most rules everywhere.

I only turned on the [correctness category](https://oxc.rs/docs/guide/usage/linter/rules.html#correctness-201) of rules, and even then I had to disable the [no-unused-vars rule](https://oxc.rs/docs/guide/usage/linter/rules/eslint/no-unused-vars.html). There are unused vars all over the place.

I think we should aim for a stricter lint rule set, perhaps something close to https://standardjs.com/. However, standard still uses ESLint. I could try and replicate most of it in the oxlint configuration, but my guess is that this repo will have many many violations to fix.