/**
 * Port Semaphore Manager
 * Coordinates physical UART ownership via the filesystem.
 *
 * Provides:
 * - SemaphoreManager: Singleton for hardware-level port locking.
 * - portSemaphoreManager: Default exported instance.
 */
/**
 * Port Semaphore Manager
 * Coordinates physical UART ownership via the filesystem.
 * Named .port.<sanitized_id>.lock to prevent collision and ensure server-wide consistency.
 */
export declare class SemaphoreManager {
    private static instance;
    private constructor();
    static getInstance(): SemaphoreManager;
    private getLockFilePath;
    /**
     * Claims a physical port by creating a lock file.
     * If the file already exists, it updates the timestamp.
     */
    claimPort(port: string, reason?: string): void;
    /**
     * Releases a claim by removing the lock file.
     */
    releasePort(port: string): void;
    /**
     * Checks if a port is physically claimed by a high-priority operation.
     */
    isPortClaimed(port: string): boolean;
    /**
     * Retrieves the current claim payload for a port, if it exists.
     */
    getClaim(port: string): any | null;
}
export declare const portSemaphoreManager: SemaphoreManager;
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