Add pull request lint workflow

[Copilot]

This adds a GitHub Actions workflow to run linting for every pull request. The workflow reads the pnpm version from package.json and uses read-only token permissions.

• Workflow

  • adds .github/workflows/lint.yml
  • triggers on pull_request
  • runs a single lint job on ubuntu-latest

• Toolchain setup

  • configures pnpm via the packageManager field in package.json
  • sets up the latest Node.js LTS version with pnpm cache enabled
  • installs dependencies via pnpm install --frozen-lockfile

• Security hardening

  • scopes GITHUB_TOKEN permissions to:

    permissions:
      contents: read

• Lint execution

  • runs type-checking and ESLint directly without auto-fixing, so pull requests fail when violations exist:

    - name: Run lint
      run: pnpm exec tsc && pnpm exec eslint lib

[Copilot]

Pull request overview

This PR adds the repository’s first GitHub Actions workflow to run lint/type-checking on pull requests, operationalizing the existing pnpm lint contributor guidance.

Changes:

• Adds a pull_request workflow named Lint.
• Sets up pnpm 10.6.3 and Node.js 22 with pnpm caching.
• Installs dependencies with a frozen lockfile and runs linting.

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[Copilot]

Pull request overview

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