/**
 * Durable blockage registry (DEC-092, EVO-3). Parallel to the drumbeat
 * registry: a peer's blockage must outlive the ~15s presence sweep so other
 * agents can see it and help. Stored at `<root>/.h2a/blockage/<safe-instance>.json`.
 * The `NotificationDispatcher` diffs this directory to push `peer.blocked` /
 * `peer.unblocked` to subscribed peers (DEC-052).
 */
import type { H2ABlockage } from "@sentropic/h2a";
export interface RaiseBlockageInput {
    readonly instance: string;
    readonly scope: string;
    readonly reason: string;
    readonly needs?: string;
}
/**
 * Raise (upsert) a blockage. A fresh raise clears any prior resolution — the
 * agent is blocked again, on possibly a new reason.
 */
export declare function raiseBlockage(root: string, input: RaiseBlockageInput, now?: number): H2ABlockage;
export declare function readBlockage(root: string, instance: string): H2ABlockage | undefined;
export declare function listBlockages(root: string): H2ABlockage[];
/**
 * Resolve a blockage (idempotent). Returns the resolved blockage, or undefined
 * if the instance has none recorded. Re-resolving keeps the first resolution.
 */
export declare function resolveBlockage(root: string, instance: string, options?: {
    by?: string;
    now?: number;
}): H2ABlockage | undefined;
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