Use for hands-on UIKit MVVM questions: setting up Combine bindings between UIViewController and ViewModel (@Published + sink), extracting business logic from massive ViewControllers step by step, testing ViewModels with XCTestExpectation + Combine publishers, fixing [weak self] retain cycles in sink closures, migrating DispatchQueue/GCD completion handlers to Combine, or replacing reloadData() wit
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Approach: Production-First Iterative Refactoring — This skill is built for production enterprise codebases where stability and reviewability matter more than speed. Architecture changes are delivered through iterative refactoring — small, focused PRs (≤200 lines, single concern) tracked in a refactoring/ directory. Critical safety issues ship first; cosmetic improvements come last.
