- Introduced specific error variants (e.g., `FileOpenError`, `FileWriteError`, `DirectoryCreateError`) in `RepositoryError` for better error diagnostics.
- Applied `.map_err()` handling for operations like file creation, copying, renaming, and directory manipulation.
- Replaced direct `HashMap` usage with `Mutex<HashMap>` for thread-safe access to catalog managers in `RestBackend`.
- Refactored `list_packages` to use `list_packages_from_catalog`, removing reliance on the search API.
- Added temporary directory management for non-local-cache scenarios in `RestBackend`.
- Introduced `pkg6recv` for downloading packages from IPS repositories with support for recursive dependency fetching.
- Implemented CLI commands with `clap` for source/destination setup, package selection, and publisher defaults.
- Added `ConsoleProgressReporter` for detailed receive progress visibility.
- Enhanced the `Manifest` parser to support JSON format alongside IPS text format.
- Updated `FileBackend` and `RestBackend` repositories to fetch manifests and payloads in new operations.
- Extended `Digest` utilities for payload integrity checks.
- Added tests to verify basic functionality and manifest format preservation.
