Agent Skills: nestjs-caching

Implement multi-level caching, invalidation patterns, and stampede protection in NestJS. Use when adding Redis caching layers, configuring cache-manager interceptors, implementing stale-while-revalidate, or preventing cache stampedes in NestJS services. (triggers: **/*.service.ts, **/*.interceptor.ts, CacheInterceptor, CacheTTL, Redis, stale-while-revalidate)