API endpoint that gives only the fields of a run that self-play clients need. :return:

GET /api/runs/current_for_client/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "id": 3,
    "url": "https://katagotraining.org/api/runs/kata1/?format=api",
    "name": "kata1",
    "data_board_len": 19,
    "inputs_version": 7,
    "max_search_threads_allowed": 8
}