Adaptive Difficulty Engine

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  "lastCalibrated": "2026-05-15T14:05:26.000Z",
  "createdAt": "2026-05-15T14:05:26.000Z"
}

{
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  "createdAt": "2026-05-15T14:04:16.000Z"
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{
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{
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  "createdAt": "2026-05-15T02:38:26.000Z"
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{
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  "vocabularyBreadth": 1500,
  "preferredDifficulty": null,
  "lastCalibrated": "2026-05-15T02:38:01.000Z",
  "createdAt": "2026-05-15T02:38:01.000Z"
}