/**
 * @fileoverview TaskRunner Process Management Utilities
 * @module @skillsmith/core/services/TaskRunner.process
 * @see SMI-1662: TaskRunner - Background Task Timeout Management
 * @see SMI-2741: Split from TaskRunner.ts to meet 500-line standard
 *
 * Low-level process lifecycle management for background task cleanup:
 * - Graceful shutdown with SIGTERM → SIGKILL escalation
 * - Immediate kill with SIGKILL
 * - Sleep utility for grace period waiting
 */
/**
 * Gracefully shutdown a process: SIGTERM -> wait -> SIGKILL
 *
 * Sends SIGTERM first to allow graceful shutdown, waits for the
 * grace period, then escalates to SIGKILL if the process is still running.
 *
 * @param pid - Process ID to shutdown
 */
export declare function gracefulShutdown(pid: number): Promise<void>;
/**
 * Kill a process immediately with SIGKILL
 *
 * @param pid - Process ID to kill
 */
export declare function killProcess(pid: number): Promise<void>;
/**
 * Sleep for a specified duration
 *
 * @param ms - Duration in milliseconds
 */
export declare function sleep(ms: number): Promise<void>;
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