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Add WebSocket transport support for the OpenAI Responses API, enabling lower-latency persistent connections for tool-call-heavy workflows. Key features: - wsTransport manages WebSocket connection lifecycle with automatic reconnection before the 60-minute connection limit - previous_response_id auto-chaining for incremental continuation - generate:false warmup support via GenerateWarmup provider option - Falls back to HTTP transparently on WebSocket connection failure - One in-flight response at a time per connection (mutex-protected) New provider options: - WithWebSocket() enables WebSocket mode (requires WithUseResponsesAPI) - PreviousResponseID on ResponsesProviderOptions for explicit chaining - GenerateWarmup on ResponsesProviderOptions for prefill/warmup The WebSocket events use the same JSON structure as HTTP SSE events, so both Generate() and Stream() reuse existing event parsing logic. No changes to the LanguageModel interface or consumer-facing API.
…ponse_id When using WebSocket mode with previous_response_id chaining, the server already has the prior conversation context. Previously we sent the full input array every time, which was redundant and incorrect per the spec. Now wsTransport tracks lastInputLen (the number of input items sent in the last successful request). On subsequent calls with previous_response_id, only new items are sent. Additionally, function_call items are filtered out since the server generated those as part of its own response output. On chain breaks (previous_response_not_found errors), lastInputLen resets to 0 so the next call sends the full prompt.
…sponsesFinishReason - Handle response.failed events in both generateViaWebSocket and streamViaWebSocket (previously would return nil error with empty content) - Fix read goroutine leak on context cancellation by setting a read deadline when ctx is done, allowing ReadMessage to unblock - Use mapResponsesFinishReason in generateViaWebSocket to match the HTTP path's handling of incomplete_details reasons
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