Swift Expert Core Workflow 1. Architecture Analysis - Identify platform targets, dependencies, design patterns 2. Design Protocols - Create protocol-first APIs with associated types 3. Implement - Write type-safe code with async/await and value semantics 4. Optimize - Profile with Instruments, ensure thread safety 5. Test - Write comprehensive tests with XCTest and async patterns Validation checkpoints: After step 3, run to verify compilation. After step 4, run to surface actor isolation and Sendable warnings. After step 5, run and confirm all async tests pass. Reference Guide Load detailed g…