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3949621cf1
Enable OpenAI Responses background mode with resilient streaming for GPT‑5 Pro and any model flagged via metadata.
Key changes:
- Background mode enablement
• Auto-enable for models with info.backgroundMode === true (e.g., gpt-5-pro-2025-10-06) defined in [packages/types/src/providers/openai.ts](packages/types/src/providers/openai.ts).
• Also respects manual override (openAiNativeBackgroundMode) from ProviderSettings/ApiHandlerOptions.
- Request shape (Responses API)
• background:true, stream:true, store:true set in [OpenAiNativeHandler.buildRequestBody()](src/api/providers/openai-native.ts:224).
- Streaming UX and status events
• New ApiStreamStatusChunk in [src/api/transform/stream.ts](src/api/transform/stream.ts) with statuses: queued, in_progress, completed, failed, canceled, reconnecting, polling.
• Provider emits status chunks in SDK + SSE paths via [OpenAiNativeHandler.processEvent()](src/api/providers/openai-native.ts:1100) and [OpenAiNativeHandler.handleStreamResponse()](src/api/providers/openai-native.ts:651).
• UI spinner shows background lifecycle labels in [webview-ui/src/components/chat/ChatRow.tsx](webview-ui/src/components/chat/ChatRow.tsx) using [webview-ui/src/utils/backgroundStatus.ts](webview-ui/src/utils/backgroundStatus.ts).
- Resilience: auto-resume + poll fallback
• On stream drop for background tasks, attempt SSE resume using response.id and last sequence_number with exponential backoff in [OpenAiNativeHandler.attemptResumeOrPoll()](src/api/providers/openai-native.ts:1215).
• If resume fails, poll GET /v1/responses/{id} every 2s until terminal and synthesize final output/usage.
• Deduplicate resumed events via resumeCutoffSequence in [handleStreamResponse()](src/api/providers/openai-native.ts:737).
- Settings (no new UI switch)
• Added optional provider settings and ApiHandlerOptions: autoResume, resumeMaxRetries, resumeBaseDelayMs, pollIntervalMs, pollMaxMinutes in [packages/types/src/provider-settings.ts](packages/types/src/provider-settings.ts) and [src/shared/api.ts](src/shared/api.ts).
- Cleanup
• Removed VS Code contributes toggle for background mode; behavior now model-driven + programmatic override.
- Tests
• Provider: coverage for background status emission, auto-resume success, resume→poll fallback, non-background negative in [src/api/providers/__tests__/openai-native.spec.ts](src/api/providers/__tests__/openai-native.spec.ts).
• Usage parity unchanged validated in [src/api/providers/__tests__/openai-native-usage.spec.ts](src/api/providers/__tests__/openai-native-usage.spec.ts).
• UI: label mapping tests for background statuses in [webview-ui/src/utils/__tests__/backgroundStatus.spec.ts](webview-ui/src/utils/__tests__/backgroundStatus.spec.ts).
Notes:
- Aligns with TEMP_OPENAI_BACKGROUND_TASK_DOCS.DM: background requires store=true; supports streaming resume via response.id + sequence_number.
- Default behavior unchanged for non-background models; no breaking changes.
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