Add a new Complete the Sentence quiz type that renders a Spanish example sentence from the card with the target word blanked out and asks the student to pick the missing word from 4 choices (other cards' fronts from the same week's pool). Core logic lives in SharedModels/SentenceQuizEngine as pure functions over VocabCard, covered by 18 Swift Testing tests. CourseQuizView calls the engine, pre-filters the card pool to cards that can produce a resolvable blank, and reuses the existing MC rendering via a new correctAnswer(for:) helper. VocabCard gains examplesBlanks (parallel array to examplesES) so content can explicitly tag the blanked substring; DataLoader reads an optional "blank" key on each example. Additive schema change, CloudKit-safe default. Also adds ContentCoverageTests that parse the repo's course_data.json and assert every card has >=3 examples and yields a resolvable question. These tests currently fail: 1,117 cards still need sentences. They are the oracle for the gap-fill pass that follows. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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