/**
 * Context Storage
 * Read/write .ralph/.context.json for persisted project analysis
 */
import type { PersistedContext } from './types.js';
export declare const CONTEXT_VERSION = 1;
/**
 * Save context to .ralph/.context.json
 *
 * Ensures .ralph directory exists. Stamps version automatically.
 * Throws on filesystem errors.
 */
export declare function saveContext(context: Omit<PersistedContext, 'version'>, projectRoot?: string): Promise<void>;
/**
 * Load context from .ralph/.context.json
 *
 * Returns null if file does not exist.
 * Throws if file exists but contains invalid JSON or fails validation.
 */
export declare function loadContext(projectRoot?: string): Promise<PersistedContext | null>;
/**
 * Calculate the age of a persisted context
 */
export declare function getContextAge(context: PersistedContext): {
    ms: number;
    human: string;
};