{
  "changes": [
    {
      "date": "2026-10-14",
      "text": "Engine registry: pin versions with `engine`, pass options (`elo`, `hash_mb`, `chess960`, `show_wdl`); GET /v1/engines."
    },
    {
      "date": "2026-10-14",
      "text": "Pricing switched to node budgets: one unit is 500k nodes, quoted by GET /v1/price and enforced as a cap."
    },
    {
      "date": "2026-10-14",
      "text": "Private preview: /v1/eval, /v1/bestmove, /v1/price, /v1/signup, keys with scopes and budgets, Stripe billing."
    }
  ]
}