Traditional tests measure accuracy, but ignore effort. This suite measures automaticity. Using a vanilla JS adaptive engine and Log-Likelihood Ratios (LLR), it navigates 24 CEFR sub-levels in real-time. By analyzing response latency, it identifies a "Cognitive Ceiling"—the point where mental effort peaks even if answers remain correct. Features: • Adaptive A1–C2.2+ ladder • Distinguishes lucky guesses from mastery • Open-source & privacy-first