/**
 * Constants for the background task subsystem.
 */
/** Maximum number of tasks running concurrently (global). */
export declare const DEFAULT_MAX_CONCURRENT = 5;
/** Maximum concurrent tasks per model/provider. */
export declare const DEFAULT_PER_MODEL_LIMIT = 2;
/** How often (ms) to poll running tasks for status updates. */
export declare const DEFAULT_POLL_INTERVAL_MS = 3000;
/** If a running task's output doesn't change for this long, mark it completed. */
export declare const DEFAULT_IDLE_TIMEOUT_MS = 10000;
/** Task lifecycle states. */
export type BackgroundTaskStatus = 'pending' | 'running' | 'completed' | 'error' | 'cancelled';
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