[B-010] Create demo apps using example models

[ronstorm]

Summary

Created comprehensive Examples directory with multiple demo apps showcasing TCAKit library usage across different complexity levels.

What Was Created

• Examples/ directory structure with complete demo ecosystem
• BasicCounter/: Simple counter app demonstrating basic TCAKit patterns
• TodoList/: Intermediate app showing CRUD operations and complex state management
• WeatherApp/: Advanced app demonstrating network requests and async effects
• Documentation: Complete setup and usage guides
• Xcode project: Ready-to-run TCAKitExamples.xcodeproj

Key Features

• Multiple complexity levels: From basic counter to advanced weather app
• Complete documentation: DEPENDENCY_SETUP.md, HOW_TO_RUN.md, README.md
• SwiftUI integration: Proper @ObservedObject/@StateObject usage
• Real-world patterns: CRUD operations, network requests, error handling
• Easy setup: Copy-paste examples with clear instructions

Technical Implementation

• Fixed Store's @MainActor integration for proper state publishing
• Implemented proper SwiftUI state observation patterns
• Added comprehensive test coverage for all examples
• Created standalone runnable apps with @main attributes

Result

Complete demo ecosystem that showcases TCAKit usage from beginner to advanced levels, with working examples that developers can copy and run immediately.