Design Patterns

Use this skill whenever the user wants to identify, apply, or refactor toward design patterns in their codebase. Triggers include: "apply design patterns", "identify patterns", "what patterns should I use", "refactor to strategy pattern", "apply factory method", "use observer pattern", "code smells that need patterns", "which design pattern fits", "improve architecture with patterns", "decouple this code", "make this extensible", "reduce coupling", "apply SOLID principles", or any mention of a specific GoF pattern name (Factory, Singleton, Observer, Strategy, etc.). Also triggers when the user mentions "Refactoring Guru", "Gang of Four", or "GoF patterns". Works standalon…