Returns a specification to start this module under a supervisor.

See Supervisor.

Gets the orchestrator process for a session, starting one if it doesn't exist.

@spec start_orchestrator(binary(), module(), map()) ::
  :ignore | {:error, any()} | {:ok, pid()} | {:ok, pid(), any()}

Starts a new orchestrator process for a session.

Returns the process name for a session's orchestrator.