improve-codebase-architecture

Explore a codebase to find opportunities for architectural improvement by deepening shallow modules (John Ousterhout, "A Philosophy of Software Design"). Use when the user says "improve architecture", "find refactoring opportunities", "make this more testable", "this codebase is hard to navigate", "consolidate these modules", "find coupling problems", "write an RFC for this refactor", or "help me think about module…