Implement ArchiveBackend (read) and ArchiveWriter (create) using zip with
zstd compression. Adds archive/import-archive subcommands to pkg6repo and
.p6p source support to pkg6recv.
- Implemented support for fetching, importing, and storing signature payloads during transaction creation.
- Added the `Signature` struct to represent signature-related action data.
- Updated `Manifest` to include and process `signatures` as part of its fields.
- Enabled signature file imports with proper path resolution in `pkg6repo`.
- Introduced `legacy_manifest_content` field in `Transaction` to allow preserving byte-identical legacy manifests.
- Updated `commit` method to save both JSON and legacy manifests, falling back to JSON if no legacy content is provided.
- Enhanced manifest copy logic to handle both JSON and legacy formats during transaction finalization.
- Improved catalog rebuild to skip `.json` files when a corresponding legacy manifest exists.
- Adjusted indentation and line breaks for structs, functions, and method calls to comply with Rust formatting standards.
- Improved error message formatting and consistency across `PkgTreeError` instances.
- Restructured long function arguments and chained calls for clarity and maintainability.
- Simplified conditional statements and loops for better readability.
- No functional changes introduced.
- Eliminate obsolete assertions for the root `file` directory as it is no longer created.
- Update tests to validate file paths in `publisher`-specific directories, aligning with the updated repository structure.
- Simplify `create_directories` by removing unnecessary `file` directory creation.
- Add methods to find and clean up obsoleted packages older than a specified TTL (`find_obsoleted_packages_older_than_ttl` and `cleanup_obsoleted_packages_older_than_ttl`) in `libips`.
- Implement a new `CleanupObsoleted` command in `pkg6repo` to handle cleanup operations.
- Update workspace `Cargo.toml` files with unified attributes for better consistency.
- Adjust dependencies (`libips` version patterns, `thiserror` updates) and enhance metadata management for obsoleted packages.
- Enhance repository operations by adding batch processing and robust logging during cleanup.
- Introduce `NULL_HASH` constant to indicate the absence of original manifest storage.
- Add `new_with_null_hash` method to create metadata for obsoleted packages without storing full manifests.
- Implement on-the-fly generation of minimal manifests with obsoletion attributes for packages with null hash.
- Update `pkg5_import` to use null hash for obsoleted packages, reducing storage requirements.
- Document null hash usage and its benefits in `obsoleted_packages.md`.
- Add `obsoleted.rs` module to handle storing, metadata management, and operations for obsoleted packages.
- Implement commands for marking, listing, searching, restoring, exporting, and importing obsoleted packages (`pkg6repo`).
- Enhance `RepositoryError` with `From` implementations for various error types to manage database and serialization-related errors.
- Introduce reusable data structures for obsoleted package metadata and export representation.
- Update `Cargo.toml` and `Cargo.lock` to include new dependencies (`redb`, `bincode`, etc.).
- Document obsoleted package workflow and integration details in `doc/obsoleted_packages.md` for contributors.
- Refactor repository internals to integrate obsoleted package support without disrupting existing workflow.
- Add robust error handling, logging, and pagination for enhanced usability and scalability.
- Introduce a two-level directory structure for file paths (`xx/yy/hash`) in `pkg5_import.rs` for improved scalability, with fallback to the old structure for compatibility.
- Remove outdated end-to-end tests for `pkg5` imports, reducing redundancy and streamlining test coverage.
- Standardize formatting by aligning and cleaning up indentation, spacing, and line breaks across multiple modules.
- Enhance logging with improved message formatting for better context and readability.
- Simplify error handling in `pkg6dev`, `pkg6repo`, and core libraries by consolidating redundant patterns and improving clarity.
- Update test cases to reflect formatting and logging changes while extending coverage of edge cases.
- Perform general cleanup, including removing unused imports, refining comments, and ensuring consistent style.
- Modify `rebuild` and `refresh` methods to take `&self` instead of `&mut self`.
- Replace mutable repository instances in `pkg6dev`, `pkg6repo`, and core library with immutable ones.
- Introduce `debug` logging for enhanced traceability during metadata rebuild and refresh.
- Extract and simplify catalog rebuild logic into a dedicated `rebuild_catalog` method.
- General cleanup: remove redundant methods, reorganize logic, and refine comments across affected files.
- Update `FileBackend` to store files in a multi-level directory structure (`xx/yy/hash`) based on hash prefixes.
- Adjust method signatures and logic across `FileBackend`, `pkg6dev`, and `pkg6repo` to support mutable repository operations.
- Add test cases and scripts (`test_file_structure.rs`, `test_repo_operations.sh`) to validate the new file structure.
- Refactor catalog manager to use `RefCell` for interior mutability to enable lazy initialization.
- Clean up redundant and dead code, enhance comments, and replace outdated logic for file handling and metadata operations.
- Centralize package metadata in workspace for consistency.
- Upgrade `pkg6dev` and `pkg6repo` to version `0.5.1`, aligning with new workspace configuration.
- Introduce `EnvFilter` for dynamic logging configuration, defaulting to debug level.
- Add `LoggingEnvError` variant to `Pkg6DevError` with structured diagnostics for improved error handling.
