/**
 * Cross-platform process liveness probe.
 *
 * `process.kill(pid, 0)` is the canonical "is this PID alive" check on POSIX.
 * It sends no signal but throws `ESRCH` if the PID is gone. Windows also
 * supports it via Node's `process.kill` polyfill (reports the target's
 * existence via the same error semantics).
 *
 * Used by `CliTaskRunner.cancel` and by `SqliteTaskStore` orphan detection to
 * decide whether a `working`/`input_required` task is still being executed.
 *
 * @module task/helpers/process-liveness
 */
/** Returns `true` if a process with the given PID is alive and accessible. */
export declare function isAlive(pid: number): boolean;
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