Agent Skills: drupal-contribute

Full drupal.org contribution workflow — create an issue and set up a merge request together. Invoke when user wants to contribute to a Drupal module, says \"contribute to drupal.org\", \"create a drupal.org issue and MR\", or uses /drupal-contribute. Requires user interaction at two manual steps (CAPTCHA-protected issue creation and issue fork creation). Has side effects: clones repos to ~/.cache/drupal-contrib/ and creates drupal.org issues.