@type t() :: %Jidoka.Turn.Plan{
  max_model_turns: integer(),
  metadata: map(),
  phases: [
    (:assemble_prompt
     | :plan_model_effect
     | :apply_model_result
     | :plan_operation_effects
     | :apply_operation_results)
    | binary()
  ],
  spec: term(),
  timeout_ms: integer(),
  workflow_profile:
    (:chat | :tool_loop | :structured_result | :controlled_tool_loop) | binary()
}