import type { RunQualitySnapshot } from "./types.js";
export interface GuardCursor {
    schema_version: 1;
    segment: string;
    last_event_id?: string;
    next_eligible_at: string;
    config_digest: string;
    updated_at: string;
}
export interface EvaluationLock {
    pid: number;
    acquired_at: string;
    nonce: string;
}
export declare function guardDir(coordRoot: string): string;
export declare function snapshotPath(coordRoot: string, instanceId: string): string;
export declare function readRunQualitySnapshot(coordRoot: string, instanceId: string): RunQualitySnapshot | null;
export declare function readFreshRunQualitySnapshot(coordRoot: string, instanceId: string, now?: Date): RunQualitySnapshot | null;
export declare function readGuardCursor(coordRoot: string): GuardCursor | null;
export declare function writeGuardCursor(coordRoot: string, cursor: GuardCursor, nonce: string): void;
export declare function writeRunQualitySnapshot(coordRoot: string, snapshot: RunQualitySnapshot, nonce: string): void;
export declare function acquireEvaluationLock(coordRoot: string, now: Date, staleSeconds: number): EvaluationLock | null;
export declare function evaluationLockOwned(coordRoot: string, nonce: string): boolean;
export declare function releaseEvaluationLock(coordRoot: string, nonce: string): void;
export declare function cleanupOrphanSnapshots(coordRoot: string, liveIds: Set<string>): void;
export declare function writeAtomicJson(path: string, value: unknown, nonce: string, beforeRename?: () => boolean): void;
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