A generic, configurable directory walker using a fluent builder pattern. It supports filtering (by excluded items, extensions, size limits), grouping (e.g., by inode), parallel iteration via rayon, stop-flag cancellation, and progress reporting over a channel. This component is self-contained within `czkawka_core` and can be extracted for any Rust project that needs to traverse large file trees with advanced filtering and concurrency.

Generic cache load/save/clean infrastructure parameterized over any serializable type implementing `ResultEntry`. Uses `bincode` for fast binary serialization with JSON fallback, automatic cache versioning via constants, and periodic cleaning of stale entries. This pattern is used by every tool in the project and can be reused in any application that needs persistent, versioned, and self-cleaning caches.

A wrapper around `crossbeam_channel::Sender` that throttles messages to a receiver, ensuring updates are sent at most once per configurable interval. It accumulates pending messages and flushes on drop. This is a small, self-contained utility that can be extracted to reduce UI update frequency in any Rust application with high-throughput progress reporting.