Interface IProcedureFailure

Failed outcome carrying an error message, an optional original Error, and an optional structured breakdown (IProcedureFailure.details) of the distinct reasons behind a composite failure (e.g. one entry per validation gate violation), so callers can present them individually instead of parsing the joined message.

interface IProcedureFailure {
    success: false;
    status: string;
    message: string;
    error?: Error;
    details?: readonly string[];
}