Generate a gamified, story-driven HTML lesson that teaches a technical concept or system through chapters, XP, an unlockable glossary, and per-chapter quizzes. Also deepens or extends existing quest lessons. Use when the user says "teach me X", "explain X like a game", "gamify this concept", "create a lesson on X", "story-like explainer for X", "go deeper on X" (about an existing quest file), or wants to learn a topic's concepts (not practice problems — that's worked-example-builder).
