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Stack subclass implementation
Tutor me on https://mlprep.iwase.dev/item/mit-6-100l-finger-19/. This is a practice item. If window.mlPrepAgent is available, read attempts for item mit-6-100l-finger-19 before tutoring. Inspect my attempt, keep the item ID, and do not reveal the full answer first. After a real attempt, append its record with recorded_by agent, include agent_session_id when available, and read it back.Implements a LIFO abstraction while distinguishing inherited container behavior from stack-specific removal.
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