Expand test coverage to CLI commands and internal packages

[jeanmachuca]

What

Current test coverage is limited to 5 test files (297 lines) focused on archive parsing and config. Missing tests for:

• cmd/ directory (CLI commands: init, install, remove, list, info, verify, search, update)
• patch/ package
• registry/ package
• log/ package

Why

Without tests for the CLI layer and key internal packages, regression bugs can slip through unnoticed.

How

• Add unit tests for each CLI command
• Add tests for patch/ and registry/ packages
• Aim for at least 50% coverage on new packages before closing