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NewLLMMetricsCapture/ResponseWriterWrapper had zero call sites, so llm_ttft_seconds, llm_itl_seconds and llm_tokens_total were exported as HELP/TYPE stubs with no samples. These are the only per-request LLM latency series covering the Ollama models (ornith:35b, qwen2.5:3b-instruct), which expose no /metrics of their own. Wire the wrapper around the response writer in ServeHTTP for model-routed requests, and delete the unused io.WriteCloser duplicate that made the gap hard to spot (two near-identical implementations, neither constructed). Correctness details: - Only SSE responses are measured. A non-streaming completion is written in one Write, which would otherwise be recorded as a TTFT sample equal to the whole request latency with no ITL samples. - requestStart is captured at the top of ServeHTTP so TTFT measures from request acceptance, not from when the upstream response is copied. - Token count skips the `data: [DONE]` terminator. - Unwrap() keeps http.ResponseController (Flush/Hijack/deadlines) working through the wrapper, so SSE unbuffering (issue #33) is unaffected. Tests: unit coverage for SSE vs non-streaming, wrapper transparency, and an end-to-end handler test that fails if the wrapper is ever wired nowhere again.