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improve-codebase-architecture

Analyze codebases for architectural friction

Analyze codebases for architectural friction and propose module-deepening refactors as testability improvements. Explores codebases organically to surface shallow modules, tightly-coupled components, and untested seams rather than following rigid heuristics. Applies John Ousterhout's "deep module" principle: small interfaces hiding large implementations for better testability and AI navigability.