The Assignment object

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  "title": "Explain mass-energy equivalence",
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  "due_at": "2026-06-01T23:59:00Z",
  "rubric": {
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      { "name": "sources",  "weight": 0.2 }
    ]
  },
  "ai_evaluator": {
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  "feedback": { "tone": "encouraging", "verbosity": "normal" },
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  "created_at": "2026-05-10T12:00:00Z"
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