curl --request GET \
  --url https://agenticadvertising.org/api/policies/history

{
  "policy_id": "gdpr_consent",
  "total": 3,
  "revisions": [
    {
      "revision_number": 2,
      "editor_name": "Pinnacle Media",
      "edit_summary": "Clarified consent requirements for minors",
      "is_rollback": true,
      "created_at": "2026-03-01T12:34:56.000Z",
      "rolled_back_to": 123
    }
  ]
}