List available personas

{
  "object": "list",
  "data": [
    {
      "id": "clx1abc2d0001abcdef123456",
      "object": "persona",
      "name": "Gen Z Consumer",
      "category": "Generational",
      "description": "Digital-native consumer aged 18-25 with strong social media influence.",
      "is_custom": false,
      "is_expert": false,
      "created_at": 1706140800
    },
    {
      "id": "clx2xyz9e0002abcdef789012",
      "object": "persona",
      "name": "SaaS CMO",
      "category": "IndustrySpecific",
      "description": "Chief Marketing Officer at a B2B SaaS company with $10M+ ARR.",
      "is_custom": true,
      "is_expert": true,
      "created_at": 1706227200
    }
  ]
}