Add CI workflow for lint + typecheck on push/PR

[jeremylongshore]

I noticed that the repo has well-structured quality scripts (biome check via bun run check, and check-types via tsc --noEmit), but they only run locally — the only GitHub Actions workflow is release.yml.

A lightweight CI workflow that runs these checks on push/PR to main would catch lint and type errors before merge. Something like:

name: CI
on:
  push: { branches: [main] }
  pull_request: { branches: [main] }
jobs:
  quality:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: oven-sh/setup-bun@v2
      - run: bun install --frozen-lockfile
      - run: bun run check
      - run: bun run check-types

Happy to submit a PR if this would be useful.

[deftdawg]

Duplicate of #147