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improve-codebase-architecture
Clean up and improve an existing codebase — first prune the dead matter (unused exports/files/deps, duplication) mechanically, then hunt for deepening opportunities that turn shallow modules into deep ones. Use when the user wants to make a codebase cleaner, more production-grade, more maintainable, remove dead/unused code, improve architecture, find refactoring opportunities, consolidate tightly-coupled modules, reduce the bouncing-between-files tax, or make code more testable. Distinct from the design-time Architecture Soundness Gate (system-design-fundamentals.md — runs BEFORE code exists), deslop (cleans slop in the current branch DIFF, not the whole repo), and post-task-review's taste pass (reviews a single diff). This one walks code that already exists: clears what shouldn't be there, then deepens what survives.