Set up GitHub Actions

Configure GitHub Actions for automated builds, linting, and deployment.

Subtasks

1. CI workflow

• Create .github/workflows/ci.yml
• Configure pnpm caching for faster installs
• Add linting job (pnpm lint)
• Add type-checking job (pnpm check)
• Add build job (pnpm build)
• Run on push and PR to main

2. Deployment workflow

• Create .github/workflows/deploy.yml
• Build and deploy to GitHub Pages (or target host)
• Run only on push to main

3. Quality gates

• Require CI to pass before merging PRs
• Add branch protection rules for main

Workflow Structure

• on push/PR to main: Run lint, check, build
• on push to main: Deploy to production