New features: Recipe enhancements

## New Feature Ideas

### Recipe enhancements

```yaml
recipes:
  - name: deploy
    parallel: true
    continue_on_error: false
    env:
      ENV: production
    steps:
      - command: git checkout main
        repos: [api, frontend]  # Only run on specific repos
      - command: ./deploy.sh
        parallel: false  # Override global setting
```