/**
 * Decide whether a scanned conversation snapshot is stale relative to the
 * JSONL on disk. The scanner memoizes both its metadata index and parsed
 * conversations for the server's lifetime, so a conversation that grows after
 * the initial scan keeps serving the startup snapshot from
 * `/api/conversations/{id}`. We compare the file's mtime against the
 * snapshot's last-activity timestamp to detect that drift.
 *
 * Returns true when the file is meaningfully newer than the snapshot (a
 * re-scan is warranted). Returns false when the snapshot is current, when the
 * snapshot timestamp is unparseable (nothing to compare against — leave it),
 * or when mtime is null (stat failed — don't churn the index on a transient
 * read error).
 */
export declare function isScannedSnapshotStale(snapshotTimestamp: string | null | undefined, fileMtimeMs: number | null): boolean;
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