/**
 * Orphan quarantine protocol.
 *
 * Moves orphan session directories to `.hivemind/session-tracker/quarantine/`
 * instead of deleting them. Supports manifest verification (skip sessions
 * registered in hierarchy-manifest.json) and auto-cleanup of old entries.
 *
 * @module session-tracker/persistence/orphan-quarantine
 */
/**
 * Manages quarantine of orphan session directories.
 *
 * Orphans are session directories that exist on disk but are classified
 * as child sessions (they should not have their own directory). Instead
 * of deleting them, they are moved to quarantine for auditability.
 */
export declare class OrphanQuarantine {
    private trackerRoot;
    private quarantineDir;
    /**
     * @param deps - Injected dependencies.
     * @param deps.trackerRoot - Absolute path to `.hivemind/session-tracker/`.
     */
    constructor(deps: {
        trackerRoot: string;
    });
    /**
     * Moves an orphan session directory to quarantine.
     *
     * Creates the quarantine directory if it does not exist. Records a
     * `.quarantined-at` timestamp file for cleanup eligibility.
     *
     * Best-effort: if the source directory does not exist, silently returns.
     *
     * @param sessionID - The orphan session directory name to quarantine.
     * @returns Promise that resolves when the move is complete.
     */
    quarantineOrphan(sessionID: string): Promise<void>;
    /**
     * Checks if a session ID is registered in the hierarchy manifest
     * of a given root main session.
     *
     * @param rootMainSessionID - The root main session directory name.
     * @param childSessionID - The child session ID to check.
     * @returns `true` if the child is registered in the manifest.
     */
    isInManifest(rootMainSessionID: string, childSessionID: string): Promise<boolean>;
    /**
     * Removes quarantined entries older than the specified number of days.
     *
     * Entries must have a `.quarantined-at` timestamp file to be eligible
     * for cleanup. Entries without a timestamp are preserved (safety).
     *
     * @param daysThreshold - Number of days before an entry is considered stale.
     * @returns Array of session IDs that were removed.
     */
    cleanupOld(daysThreshold: number): Promise<string[]>;
    /**
     * Safely writes content to a file, creating parent directories if needed.
     *
     * @param filePath - Absolute path to the file.
     * @param content - Content to write.
     */
    private writeFileSafe;
}
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