name: README frontmatter check
on:
  pull_request:
    paths: ['README.md']
  push:
    branches: [main]
permissions:
  contents: read
jobs:
  check:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
      - name: Verify YAML frontmatter
        run: |
          set -eu
          head -1 README.md | grep -q "^---$" || { echo "::error::README must start with --- (YAML frontmatter)"; exit 1; }
          # find the closing ---
          if ! head -30 README.md | tail -29 | grep -q "^---$"; then
            echo "::error::No closing --- found in first 30 lines"; exit 1
          fi
          # check required fields
          for f in title sdk emoji colorFrom colorTo; do
            head -30 README.md | grep -q "^${f}:" || { echo "::error::Missing required frontmatter field: ${f}"; exit 1; }
          done
          echo "✅ Frontmatter OK"