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trello.onAttachmentDeleted matches Trello’s deleteAttachmentFromCard action.
automations/watch-trello-attachment-deletions.automation.ts
Provide board as an ID, short link, or URL. Optional static account defaults to the project binding. Returns a resource event with actionType: "deleteAttachmentFromCard", required attachment, card, and board, plus actionId, occurredAt, optional memberCreator, and the complete provider event.