/**
 * Compute context drift score for a session.
 *
 * @task T4782
 * @epic T4654
 */
export interface ContextDriftResult {
    score: number;
    factors: string[];
    completedInScope: number;
    totalInScope: number;
    outOfScope: number;
}
/**
 * Compute context drift score for the current session.
 * Compares session progress against original scope by counting
 * completed vs total tasks in scope, and detecting out-of-scope work.
 */
export declare function getContextDrift(projectRoot: string, params?: {
    sessionId?: string;
}): Promise<ContextDriftResult>;
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