feat(v0.20): adaptive sentence difficulty scoring — 3163 scored cloze sentences

Replaces length-based sentence selection with frequency-based difficulty
scoring. Easiest sentences (most common context words) become cloze candidates.

Score range: 1-50000, median=179. Coverage: 3163/3325 cloze entries scored.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Sochen 2026-03-15 13:35:23 +00:00
parent 14d567a261
commit 0a85291975

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