Fix ChatGPT subscription summaries rejected as Bad Request

[ComputelessComputer]

Summary

Problem: Summary generation fails with a generic Bad Request when Intelligence is a connected ChatGPT Plus/Pro subscription. The enhancer always sends maxOutputTokens: 8192, and @ai-sdk/openai forwards that as max_output_tokens with store: true — both rejected by chatgpt.com/backend-api/codex/responses.

Fix: Match OpenCode's ChatGPT subscription / Codex request contract on the fetch rewrite path:

• Force store: false and stream: true
• Drop unsupported max_output_tokens
• Send session_id plus compute-residency when the token carries it
• Surface Codex { "detail": "..." } payloads in the settings health check instead of just "Bad Request"

Other subscriptions: This rewrite is ChatGPT-only. Claude, Grok, Copilot, and Kimi talk to their public APIs (api.anthropic.com, api.x.ai, api.githubcopilot.com, api.kimi.com/coding), which accept the SDK's normal max_tokens / Messages bodies. OpenCode's Claude/Grok/Copilot plugins only swap auth headers for those providers — they do not rewrite the request body. Applying the Codex store/stream/max_output_tokens contract there would be wrong.

Verification

• pnpm exec dprint fmt / dprint check on the changed files
• pnpm exec oxlint --quiet --format=github apps/desktop/src/settings/ai/llm/
• pnpm -F desktop typecheck
• pnpm -F desktop test src/settings/ai/llm/subscriptions/oauth.test.ts src/settings/ai/llm/subscriptions/fetch.test.ts src/settings/ai/llm/health.test.ts

Manual ChatGPT Plus/Pro summary generation was not run here (needs a live subscription). After merge, connect ChatGPT in Settings → Intelligence and retry Enhance on a note.

  

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