fix(questionnaire): add additionalProperties false for OpenAI strict mode

[Marfuen]

Summary

• The questionnaire auto-fill was silently extracting 0 questions because every chunk parse threw Invalid schema for response_format 'response': 'additionalProperties' is required to be supplied and to be false. The try/catch in parseChunkQuestionsAndAnswers swallowed the error and returned [] for every chunk.
• Root cause: PARSING_MODEL = 'gpt-5-mini' routes through OpenAI's Responses API, which enforces strict structured outputs. Strict mode requires additionalProperties: false on every object schema (root + nested) and every property listed in required.
• Fix: add additionalProperties: false to the root and nested objects, and add 'answer' to required (it was already nullable via anyOf: [string, null]).
• Also fixed the same latent anti-pattern in content-extractor.ts's shared questionExtractionSchema. Today it's only used with Anthropic / Groq / gpt-4o-mini, but a model swap would silently break it.

Audit

Checked every generateObject / jsonSchema call across apps/api and apps/app — 13 files. Only the two patched files were affected. All other callers either use Anthropic, gateway-routed Gemini, output: 'no-schema', or zod schemas with no .optional() (Vercel AI SDK auto-emits additionalProperties: false for those).

Test plan

• Re-upload q-section2.pdf to questionnaire auto-fill — questions should populate
• Re-upload an Excel questionnaire (exercises content-extractor path) — still works
• Verify Trigger.dev parse-questionnaire task completes without "Error parsing chunk" logs

---

Summary by cubic

Fixes questionnaire auto‑fill returning zero questions by making our JSON schemas compatible with OpenAI strict mode. Adds additionalProperties: false and requires answer, so gpt-5-mini parses chunks correctly instead of failing silently.

• Bug Fixes
  • Added additionalProperties: false to root and nested objects in question-parser.ts and content-extractor.ts.
  • Added answer to required (still nullable).
  • Prevents swallowed parse errors; questions now populate and the shared extractor is future‑proof for strict‑mode models.

^{Written for commit 9f8d33e. Summary will update on new commits.}

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Project	Deployment	Actions	Updated (UTC)
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[claudfuen]

🎉 This PR is included in version 3.46.0 🎉

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