[codex] fix grading assistant data route

Summary

Imported from GitHub PR #124.

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Repo sync Metadata

{
  "url": "https://github.com/The-Connell-School/yawp-2.0/pull/124",
  "repo": "The-Connell-School/yawp-2.0",
  "draft": false,
  "state": "MERGED",
  "title": "[codex] fix grading assistant data route",
  "branch": "codex/fix-grade-essay-ai-data-404",
  "checks": {
    "total": 7,
    "failing": 3,
    "pending": 0,
    "successful": 4
  },
  "number": 124,
  "syncedAt": "2026-05-26T21:38:23.522Z",
  "mergeable": "UNKNOWN"
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