/**
 * Internal concurrent executor for fanout branches.
 * No third-party dependencies. Uses native AbortController,
 * Promise.allSettled, and setTimeout.
 */
export interface FanoutTask<T> {
    readonly id: string;
    readonly fn: (signal: AbortSignal) => Promise<T>;
}
export interface FanoutResult<T> {
    readonly id: string;
    readonly status: "success" | "failure" | "aborted";
    readonly value?: T;
    readonly error?: string;
}
export interface FanoutOptions {
    readonly timeoutMs?: number;
}
export declare function runFanout<T>(tasks: readonly FanoutTask<T>[], options?: FanoutOptions): Promise<readonly FanoutResult<T>[]>;
/** Abort all remaining tasks. Call after policy evaluation decides to halt. */
export declare function createFanoutController(): {
    controller: AbortController;
    abort: () => void;
};