Add file content comparison and versioning

[eric-downes]

Enhancement Description

Implement file content comparison and versioning to track changes over time.

Proposed Features

• Compare file content between syncs
• Maintain version history of knowledge files
• Show diffs between versions
• Option to restore previous versions locally

Implementation Ideas

• Use git-like versioning for file history
• Store file hashes for efficient comparison
• Create a changelog for each project
• Add commands to view file history and diffs

Benefits

• Track evolution of project knowledge
• Ability to recover previous versions
• Better understanding of changes over time