docs: record Qwen MLX benchmark results

benchmarks/inference/results/cold_start.json

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+{
+  "measured_at": "2026-08-31",
+  "notes": [
+    "Cold starts were measured separately from warm inference.",
+    "The vLLM model was already present in the Hugging Face cache; zero bytes were downloaded.",
+    "vLLM launch-to-ready is derived from the recorded epoch and second-resolution API startup log.",
+    "Ollama's daemon was already running, but the model was fully unloaded before the request.",
+    "The Ollama request used one output token and keep_alive=0 so generation time was negligible and the model was unloaded afterward."
+  ],
+  "vllm_metal": {
+    "process_start_epoch": 1788177244.465068,
+    "api_ready_local_time": "2026-08-31T13:54:33+02:00",
+    "approx_launch_to_api_ready_s": 28.535,
+    "model_load_s": 3.25,
+    "engine_profile_cache_warmup_s": 9.71,
+    "download_bytes": 0
+  },
+  "ollama": {
+    "client_total_s": 3.455159667,
+    "server_total_s": 3.448873125,
+    "model_load_s": 3.244982292,
+    "prompt_eval_s": 0.13364925,
+    "decode_s": 0.069530292,
+    "prompt_tokens": 7,
+    "output_tokens": 1
+  }
+}