/**
 * Advisory File Lock (GIT-24)
 *
 * Uses O_CREAT | O_EXCL for atomic lock file creation — the standard
 * POSIX advisory lock pattern. Zero dependencies.
 *
 * Lock file: .gitmem/active-sessions.lock
 *
 * Stale lock detection: if a lock file is older than STALE_THRESHOLD_MS,
 * the holder likely crashed. We break the stale lock and retry.
 */
/**
 * Acquire an advisory file lock synchronously.
 *
 * Uses O_CREAT | O_EXCL to atomically create the lock file.
 * Retries with sleep until timeout. Breaks stale locks.
 *
 * @throws Error if lock cannot be acquired within timeout
 */
export declare function acquireLockSync(lockPath: string, timeoutMs?: number, retryMs?: number): void;
/**
 * Release an advisory file lock synchronously.
 * Ignores ENOENT (lock already released).
 */
export declare function releaseLockSync(lockPath: string): void;
/**
 * Execute a function while holding an advisory file lock.
 * Guarantees lock release even if fn throws.
 */
export declare function withLockSync<T>(lockPath: string, fn: () => T): T;
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