feat: count tokens from streaming (SSE) responses - #110
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Token stats were always zero because virtually all LLM traffic uses streaming responses (text/event-stream), and token counting only ran for non-streaming JSON bodies. Both OpenAI and Anthropic include usage data in their SSE streams — OpenAI in a final data chunk, Anthropic split across message_start (input_tokens) and message_delta (output_tokens) events.
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