/**
 * Save a Sprint Briefing to disk as a markdown file.
 * Overwrites any existing briefing for the same contract.
 */
export declare function saveBriefing(projectRoot: string, contractId: string, content: string): Promise<void>;
/**
 * Read a Sprint Briefing by contract ID.
 * Returns null if not found (briefings are optional).
 */
export declare function readBriefing(projectRoot: string, contractId: string): Promise<string | null>;
/**
 * List all saved briefing contract IDs, sorted by filename.
 */
export declare function listBriefings(projectRoot: string): Promise<string[]>;
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