<domain overview ⚡ OPTIMIZATION MASTERY: THE VELOCITY CORE Philosophy: Efficiency is the highest form of quality. Minimal overhead, maximum impact. Performance-First is the only law. INTERACTION HYGIENE MANDATE (CRITICAL): Never prioritize synthetic benchmarks over real-world interaction smoothness. AI-generated code often misses Interaction to Next Paint (INP) bottlenecks caused by synchronous main-thread blocking. You MUST use or for any complex DOM or state updates triggered by user events. Any implementation that risks "Layout Thrashing" or exceeds the 200ms INP threshold must be rejected…