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//! Your personal AI tutor — built for understanding, not just remembering.
//!
//! Decks are plain-text files. On top of the flashcard basics it offers a
//! ratatui TUI, an optional local web frontend (`alix serve`), Leitner and
//! SM-2 schedulers, several answer modes (flip, typing, fuzzy, multiple choice,
//! line-by-line, explain), cloze and dual-direction cards, deck dependencies,
//! and per-card review statistics. Claude is woven in: an ask-Claude tutor, AI
//! deck generation, and an AI exam (`alix exam`) that gates progression on
//! verified understanding.