feat: add reasoning_content support for thinking models#119
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- Add reasoning_content field to ChatMessage - Emit Reasoning as separate Message::Assistant at SDK level - Merge Reasoning into subsequent Text/ToolCall ChatMessage in conversions - Echo reasoning_content in requests to satisfy thinking models (DeepSeek R1) - Do NOT merge consecutive ToolCall messages — preserve original LLM turn grouping Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> Signed-off-by: Cloorc <wittcnezh@foxmail.com>
Providers that support `stream_options.include_usage` (OpenAI, agnes) emit token usage in a trailing chunk whose choices carry no `finish_reason`. The stream consumer stops once a text-completion `Done` is emitted, so that trailing chunk was never read and its usage silently dropped (0/0 tokens). Defer the text-completion `Done` until usage arrives in a trailing chunk, the stream signals `[DONE]`, or the connection closes. Flush without usage on stream end so the assistant message is still recorded when no usage chunk is sent. Signed-off-by: Cloorc <wittcnezh@foxmail.com>
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