I am adding a plugin system to a Python CLI project. Design the module boundaries, folder structure, core interfaces, and dependencies, and explain how to avoid circular imports.

A clear module breakdown, interface design suggestions, example structure, and architectural cautions.

Several command classes duplicate validation, logging, and error handling. Refactor the class hierarchy, propose base classes, composition, or design patterns, and assess the impact of the changes.

A refactoring plan, recommended patterns, responsibility split, and potential risk notes.

I plan to modify five Python files to introduce the repository pattern. Review the approach for architectural consistency, testability, dependency injection, and migration steps, and suggest improvements.

Architecture-focused review feedback, improvement suggestions, and a step-by-step implementation plan.