/**
 * Writes a unix-timestamp sentinel that the pre-commit hook compares against
 * `git log -1 --format=%ct HEAD`. Any successful twining_record / twining_post /
 * twining_decide call refreshes it; the hook permits the commit when the
 * sentinel is newer than HEAD. Best-effort — never throws.
 */
export declare function writeRecordSentinel(twiningDir: string): void;
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