/**
 * Sends the configured session terminal callback.
 *
 * Absence is a no-op. Once callback metadata is present, delivery is part of
 * the remote delegation result path, so failures are logged and rethrown
 * instead of being reported as a successful terminal step. Throwing is
 * intentional: this function runs as a durable Workflow step, so rejection
 * hands retry/failure policy back to the Workflow orchestrator rather than
 * letting eve falsely mark the callback delivery as complete.
 */
export declare function fireSessionCallbackStep(input: {
    readonly error?: unknown;
    readonly output?: unknown;
    readonly serializedContext: Record<string, unknown>;
    readonly status: "completed" | "failed";
}): Promise<void>;