Close the current session of the user's active study plan after its evaluation — asks the user to explain the core ideas in their own words and writes those as the session's notes, rewrites what is still weak, marks the session closed, and when the session ends a block writes the block closure summary (coverage, results, concepts, drift) ready to copy. Use whenever the user says "cerremos la sesión", "listo por hoy", "terminé", "guarda los apuntes", "close this session", or wants to wrap up a study session or a study week/block.
