/**
 * SPEC-665: Check if conventions.json TTL is expired and trigger a background re-fetch.
 * Fire-and-forget — never blocks the caller. Silent failure on any error.
 */
export declare function triggerConventionsTtlRefresh(projectPath: string): Promise<void>;
/** Exposed for tests — check if conventions.json is currently stale. */
export declare function isConventionsStale(projectPath: string, ttlDays?: number): Promise<boolean>;
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