Use to generate a package.xml (and optionally destructiveChanges.xml / Pre / Post) from a source dir, a component list, or org introspection. Trigger on 'generate a package.xml from this folder', 'create a manifest for these classes', 'I need a deploy manifest', or 'destructiveChanges.xml for deletions'. Encodes wildcard-vs-explicit-member rules per metadata type. DO NOT TRIGGER to deploy (platform-metadata-deploy), delete (platform-destructive-deploy), or retrieve (platform-metadata-retrieve).
