List agent revisions

curl --request GET \
  --url https://api-sandbox.featherhq.com/v1/agents/{agent_id}/revisions \
  --header 'x-api-key: <api-key>'

{
  "items": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "agent_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "name": "<string>",
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z",
      "description": "<string>",
      "persona": "<string>",
      "system_prompt": "<string>",
      "global_skill_ids": [
        "3c90c3cc-0d44-4b50-8888-8dd25736052a"
      ],
      "context_variables": [
        {
          "name": "<string>",
          "source": "derived",
          "enum_values": [
            "<string>"
          ],
          "reask_cap": 123,
          "description": "<string>"
        }
      ],
      "variable_defaults": {},
      "tool_refs": [
        {}
      ],
      "knowledge_base_refs": [
        {}
      ],
      "policies_enabled": true,
      "policy_refs": [
        {}
      ],
      "channel_specific_config": {},
      "router_config_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "model_settings": {
        "model": "<string>",
        "config": {
          "temperature": 123,
          "max_tokens": 123,
          "top_p": 123,
          "stop_sequences": [
            "<string>"
          ],
          "request_timeout_ms": 123,
          "thinking_budget": 2
        }
      },
      "kb_clearance_level": 123,
      "kb_audience_tags": [
        "<string>"
      ],
      "created_by": "<string>"
    }
  ],
  "has_more": true,
  "next_cursor": "<string>"
}