Create a LinkedIn carousel campaign (ad set)

Builds a carousel sponsored-content campaign from two to ten square images, each with its own headline and destination — campaign group (a campaign in Campaign Manager), campaign (ad set), uploads, dark post and creative (ad). The campaign starts paused and holds everything back (LinkedIn creates groups and creatives only active or draft). Use when: the content is genuinely sequential (a process, a product range, several proof points). A carousel is more work than a single image and only beats one when each card earns its swipe. Do not use mixed aspect ratios: carousel cards render square (1200×1200) and anything else is cropped inconsistently across cards. Run linkedin_validate_assets on every URL first. Do not exceed ten cards or go below two — LinkedIn refuses both, and the refusal comes after the campaign has been created. Do not call it twice after a failure; it names what exists and linkedin_add_creative finishes it. Returns every id created. Nothing delivers until the user resumes the campaign. Say that the campaign is paused when you report the result, with the two links the result gives (LinkedIn Campaign Manager and the campaign's page in Adako), and offer "enable all": one linkedin_resume_campaign call, listed in the result as go_live.enable_all, one approval.