- 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.
