Extends the standard library with: - Async lock and action frequency controls (debounce/throttle). - Async lazy (PublicationOnly and ExecutionAndPublication thread safety modes). - Sync and async in-memory value and key-value caches. - Proactive async cache that refreshes values in the background before they expire. - Thread-safe and priority-based collections. - Optional and Result value types. - Argument validation methods. - Extension methods for collection interfaces. - Extension methods for standard library types like int, string, DateTime.