List Memories

{
  "memories": [
    {
      "id": "mem-abc-123",
      "content": "Our primary domain is example.com, brand color #FF6B00",
      "target": "memory",
      "agent_id": "ceo",
      "created_at": "2026-01-10T09:00:00Z"
    },
    {
      "id": "mem-def-456",
      "content": "User prefers concise bullet-point responses",
      "target": "user",
      "agent_id": "ceo",
      "created_at": "2026-01-10T09:05:00Z"
    }
  ],
  "count": 2
}