/**
 * library-cache — compress-and-cache process library files (processLibraryCache layer).
 *
 * On first access (or after TTL expiry) a file is read, compressed with
 * densityFilterText, and written to .a5c/cache/compression/<hash>.json.
 * Subsequent reads within TTL are served from cache with zero re-compression cost.
 */
/**
 * Return compressed content for `filePath`, reading from cache when fresh.
 * On cache miss: reads, compresses, writes to cache, returns compressed content.
 * Returns null if the file doesn't exist or can't be read.
 */
export declare function getOrCompressFile(filePath: string, targetReduction: number, ttlHours: number, cacheDir: string): string | null;
/**
 * Find all SKILL.md and AGENT.md files under `rootDir` (max depth 6).
 * Used by the session-start hook to pre-warm the cache.
 */
export declare function findLibraryFiles(rootDir: string): string[];
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