List Objectives

{
  "objectives": [
    {
      "id": "obj-abc-123",
      "title": "Launch email marketing campaign",
      "status": "active",
      "progress": 45,
      "success_criteria": [
        { "criterion": "3 sequences live", "met": true },
        { "criterion": "500 emails sent", "met": false }
      ],
      "created_at": "2026-01-10T09:00:00Z"
    }
  ],
  "count": 3
}