* chore(benchmarks): remove Vite 7 runner, update Next.js to 16.2.1
The vinext-rolldown benchmark runner was identical to the vinext runner
(both resolved to the same Vite version via catalog), producing
duplicate results on the dashboard. Remove it entirely and simplify
to a two-runner comparison: Next.js (Turbopack) vs vinext (Vite 8).
Also bump the Next.js benchmark dependency from 16.1.7 to 16.2.1 to
pick up recent performance improvements.
* fix: remove vinext-rolldown from pnpm-workspace.yaml, fix migration comment
Adding benchmarks/* to the workspace in the vite v8 bump caused pnpm to
hoist next out of benchmarks/nextjs/node_modules into the monorepo root.
Turbopack then couldn't find next/package.json from the project directory,
failing with a workspace root inference error.
Fix by listing benchmarks/vinext and benchmarks/vinext-rolldown explicitly
instead of using the glob, leaving benchmarks/nextjs isolated with its own
node_modules.
Also remove the eslint key from next.config.ts — it was removed from the
NextConfig type in Next.js 16 and caused an 'Unrecognized key' warning.
* add oxfmt formatter: config, scripts, CI, editor setup, docs
* rebuild lockfile
* fix: add Format to required checks list, remove dead ignore pattern
* run fmt
* add format to agents.md again
James Anderson