feat: Add iOS and Swift context files and guidelines for answering programming questions

ai/context/ios/current-practices.md

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+# Current iOS And Swift Practices
+
+## Goal
+
+Keep Swift/iOS answers modern without turning the workspace into stale API documentation.
+
+---
+
+## Currentness Rule
+
+For version-sensitive recommendations, verify against official sources before presenting as current best practice.
+
+Prefer:
+
+- Apple Developer Documentation
+- Swift.org / docs.swift.org
+- official WWDC materials when API behavior or migration guidance matters
+
+Avoid relying only on memory for:
+
+- newest SwiftUI APIs
+- Observation / data-flow migration guidance
+- Swift Testing availability or migration advice
+- Swift concurrency behavior
+- Xcode or iOS version-specific recommendations
+
+---
+
+## Stable Defaults
+
+- Prefer simple, testable Swift over clever abstractions.
+- Prefer structured concurrency over ad-hoc callback or detached-task patterns when the deployment target and codebase support it.
+- Keep UI state changes on the main actor.
+- Avoid recommending new APIs until deployment target and project constraints are known.
+- For SwiftUI, separate pure view composition from side effects and navigation/workflow coordination.
+- For testing, use the framework already adopted by the codebase unless the user explicitly asks about migration.
+
+---
+
+## Testing Guidance
+
+- Apple positions Swift Testing as a modern option for unit tests in Xcode 16 and later.
+- XCTest remains relevant, especially for UI tests, performance tests, and existing test suites.
+- Do not recommend wholesale migration from XCTest unless the project constraints support it.
+
+---
+
+## SwiftUI Guidance
+
+- Observation can be adopted incrementally; do not assume a project can immediately replace all `ObservableObject` usage.
+- In SwiftUI code review, focus on data ownership, lifecycle, invalidation scope, navigation boundaries, and side effects.
+- Avoid introducing `@StateObject`, `@ObservedObject`, `@State`, or `@Observable` recommendations without first identifying ownership and deployment constraints.
+
+---
+
+## Source Anchors
+
+- SwiftUI documentation: `https://developer.apple.com/documentation/swiftui`
+- Observation migration: `https://developer.apple.com/documentation/swiftui/migrating-from-the-observable-object-protocol-to-the-observable-macro`
+- Swift Testing: `https://developer.apple.com/documentation/testing`
+- XCTest: `https://developer.apple.com/documentation/xctest`
+- Swift language: `https://developer.apple.com/swift/`