Migrate from Prettier to oxfmt

[veksa]

This replaces Prettier with oxfmt, the formatter from the Oxc project. oxfmt is Prettier-compatible but written in Rust, so it's dramatically faster and lets us drop Prettier from the dependency tree.

What changed

The config was generated with oxfmt's built-in --migrate=prettier, so .oxfmtrc.json carries over every setting from the old .prettierrc.json one to one — no semicolons, single quotes, two-space indent, no trailing commas, avoid arrow parens. The migration also picked up that printWidth wasn't set and pinned it to Prettier's default of 80 (oxfmt's own default is 100), which keeps the wrapping identical instead of reflowing the whole codebase. The old .prettierrc.json is gone, prettier is swapped for oxfmt in devDependencies, and the format script now runs oxfmt src test. There was no .prettierignore, and oxfmt reads .gitignore on its own, so nothing was lost there.

I also added a format:check script and wired it into CI right after the lint step. Formatting was never actually enforced before — Prettier only ran locally in --write mode — so this closes that gap and stops unformatted code from slipping in.

Reformatting

oxfmt is close enough to the current Prettier output that only four files in src change, and those are the usual Prettier v2 to v3 differences in how nested ternaries and broken-up call arguments are indented (the repo was still on prettier@2). Running the formatter is idempotent afterwards.

One spot needed a manual touch: in src/types.ts there were two line comments sitting between extends and the function type, and oxfmt collapsed them onto one line and flipped their order, which turned them into nonsense. I moved the comment inside the parentheses as a leading comment on the parameter — a position the formatter handles cleanly — without changing the type itself.

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