Executes one saga command against caller-supplied exchange configurations.
It performs exactly one submission or cancellation. Reconciliation may read
the order endpoint and provider order-state collections, but never submits an
order. Retry policy belongs to Bourse.OptionSaga, where ambiguous writes are
journaled before another command can be emitted.
Summary
Functions
Executes one command using the exchange matching its venue/account domain.
Types
@type exchanges() :: %{required({String.t(), term()}) => Bourse.Exchange.t()} | %{required(String.t()) => Bourse.Exchange.t()}
@type outcome() :: {:ok, Bourse.Order.t()} | {:not_found, map()} | {:unknown, term()} | {:error, Bourse.Error.t()}