@type t() :: %Cyclium.Schemas.EpisodeStep{
  __meta__: term(),
  args_hash: term(),
  args_redacted: term(),
  cost_ms: term(),
  cost_tokens: term(),
  created_at: term(),
  episode_id: term(),
  error_class: term(),
  error_detail: term(),
  id: term(),
  kind: term(),
  result_ref: term(),
  side_effect_key: term(),
  step_no: term(),
  tool_name: term()
}