Attach/detach policies on an assistant revision

curl --request PUT \
  --url https://api-sandbox.featherhq.com/v1/agents/revisions/{revision_id}/policies \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "policy_refs": [
    {
      "policy_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
    }
  ],
  "policies_enabled": true
}
'

{
  "revision_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "policies_enabled": true,
  "policy_refs": [
    {}
  ],
  "inert_tool_policies": [
    {
      "policy_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "name": "<string>",
      "tool_target": "<string>",
      "reason": "tool_not_in_assistant_surface"
    }
  ]
}