Transform raw lecture content (transcript, plain text, or slides) into clean, structured, study-ready notes in Markdown. Use this skill whenever the user pastes lecture material — a transcript (with or without timestamps), course/lecture text, or slide content — and asks for notes, a summary, or help studying. Also trigger when the user says things like "take notes", "κράτα σημειώσεις", "φτιάξε σημειώσεις", "notes από το μάθημα", "summarize this lecture", or pastes a transcript and asks to organize or study it.