Issue #75: We're Back! Tool Calling, Default Actors & the Clock Is Ticking

iOS Code Review newsletter issue #75 covers several key updates for iOS developers. Apple's Foundation Models framework now supports tool calling, enabling agentic app features where the on-device model can invoke app-defined tools for real-time data. Swift 6.2 introduces Default Actor Isolation to reduce @MainActor annotation boilerplate, transactional state updates via the new Observations async sequence, and exit testing in Swift Testing for verifying fatal termination conditions. Additional highlights include Swift running in the browser via WebAssembly, the Swift System Metrics 1.0 release for process-level profiling, and a reminder that App Store Connect will require the iOS 26 SDK starting April 28, 2026.