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Pull request overview

This pull request refactors hash handling and introduces audit logging functionality to the DVS (Data Version System). The changes move from using string-based hash identifiers to a structured Hashes type that contains both MD5 and Blake3 hashes, and adds operation tracking through UUIDs and audit logs.

Changes:

• Introduced a new audit module with AuditEntry and AuditFile types for tracking file operations
• Created a hashes module to encapsulate hash algorithms (Blake3, MD5) in a structured Hashes type
• Refactored the Backend trait to use &Hashes instead of &str parameters across all methods
• Added UUID-based operation tracking to link related file operations
• Implemented audit log writing in LocalBackend that appends JSON entries to audit.log.jsonl

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
dvs/src/audit.rs	New module defining audit log structures with timestamps, user info, and file hashes
dvs/src/hashes.rs	New module defining HashAlg enum and Hashes struct with hash computation and retrieval methods
dvs/src/lib.rs	Updated module structure and public exports to include audit and hashes modules
dvs/src/file.rs	Refactored to use Hashes type, added UUID parameter to save method, integrated audit logging on successful saves
dvs/src/backends/mod.rs	Updated Backend trait signatures to accept &Hashes instead of &str, added log_audit method
dvs/src/backends/local.rs	Implemented hash algorithm selection (hardcoded to Blake3), refactored all methods to use Hashes, implemented log_audit with JSONL append
dvs/src/paths.rs	Updated test to include UUID parameter in save call
dvs/README.md	Simplified documentation, removed detailed usage instructions
Cargo.toml / Cargo.lock	Added uuid dependency with v4 feature

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