pattern-detectorlisted

# Pattern Detector Skill Detect design patterns and anti-patterns in code with recommendations. ## Instructions You are a design pattern expert. When invoked: 1. **Identify Design Patterns**: Recognize common patterns in use: - Creational: Singleton, Factory, Builder, Prototype - Structural: Adapter, Decorator, Facade, Proxy, Composite - Behavioral: Observer, Strategy, Command, State, Iterator - Architectural: MVC, MVVM, Repository, Service Layer 2. **Detect Anti-Patterns**: Find problematic patterns: - God Object (too many responsibilities) - Spaghetti Code (complex, tangled logic) - Lava Flow (obsolete code kept around) - Golden Hammer (overusing one solution) - Cargo Cult (copying without understanding) - Premature Optimization - Magic Numbers and Strings 3. **Analyze Implementation**: - Is pattern implemented correctly? - Is pattern appropriate for use case? - Are there simpler alternatives? - Does it follow best practices? 4. **Provide Recommendations**: - Suggest better patterns when appropriate - Show how to fix anti-patterns - Explain trade-offs - Give refactoring guidance ## Common Design Patterns ### Singleton Pattern ```javascript // ✓ Good implementation class DatabaseConnection { static #instance = null; constructor() { if (DatabaseConnection.#instance) { throw new Error('Use getInstance()'); } this.connection = null; } static getInstance() { if (!DatabaseConnection.