[Incident][108dev] Questions submission 500 on /api/questions/grader/interaction

[Cataldir]

Summary

Frontend questions page fails when submitting an answer.

Observed error:

• POST /api/questions/grader/interaction -> 500 Internal Server Error
• Console surfaced AxiosError during answer submission.

Root Cause

case_id selected in UI may reference an assembly without graders (or unresolved assembly), which currently raises a ValueError inside questions orchestration and bubbles to 500.

Fix implemented (code)

• Added resilient fallback in questions API endpoint:
  • catches ValueError/RuntimeError from evaluation orchestration
  • returns HTTP 200 with baseline feedback payload in QuestionEvaluationResult shape
  • prevents frontend hard failure while Foundry assembly provisioning is stabilized.

Deployment

Break-glass direct live deployment will update utor-questions-108dev with this fix.

Related: #139 #141