docs: scrub PII/IPs from gpu-bakeoff

- Rename host alias matt-strix -> strix-halo (removes third-party name)
- Move host URLs to env-var lookup (OLLAMA_*_URL), drop hardcoded IPs
  from harness source. Defaults: steel141 keeps localhost; pve197 and
  strix-halo require their env var to be set before use.
- Update doc: remove the Tailscale IP and LAN-IP references, describe
  access paths without specific addresses.
- Rename runs/matt-strix -> runs/strix-halo and patch the host field
  in each JSON.

Harness still functional for the original author (set the env vars)
and safe to share without leaking routable addresses.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/gpu-bakeoff/runs/strix-halo/gemma4-26b/long.json

@@ -0,0 +1,81 @@
+{
+  "host": "strix-halo",
+  "gpu": "AMD Strix Halo iGPU",
+  "vram_gb": null,
+  "model_alias": "gemma4:26b",
+  "model_tag": "gemma4:26b",
+  "prompt_key": "long",
+  "prompt_chars": 1614,
+  "num_predict": 256,
+  "num_ctx": 4096,
+  "runs": [
+    {
+      "prompt_tokens": 319,
+      "prompt_eval_ms": 22.5,
+      "prefill_tok_per_s": 14201.36,
+      "output_tokens": 256,
+      "eval_ms": 4883.4,
+      "decode_tok_per_s": 52.42,
+      "load_ms": 151.1,
+      "total_ms": 5120.3,
+      "harness_wall_s": 5.186,
+      "done_reason": "length"
+    },
+    {
+      "prompt_tokens": 319,
+      "prompt_eval_ms": 22.1,
+      "prefill_tok_per_s": 14448.45,
+      "output_tokens": 256,
+      "eval_ms": 4881.1,
+      "decode_tok_per_s": 52.45,
+      "load_ms": 159.1,
+      "total_ms": 5124.5,
+      "harness_wall_s": 5.18,
+      "done_reason": "length"
+    },
+    {
+      "prompt_tokens": 319,
+      "prompt_eval_ms": 22.3,
+      "prefill_tok_per_s": 14326.07,
+      "output_tokens": 256,
+      "eval_ms": 4885.3,
+      "decode_tok_per_s": 52.4,
+      "load_ms": 155.4,
+      "total_ms": 5128.9,
+      "harness_wall_s": 5.192,
+      "done_reason": "length"
+    }
+  ],
+  "warmup": {
+    "prompt_tokens": 319,
+    "prompt_eval_ms": 265.0,
+    "prefill_tok_per_s": 1203.86,
+    "output_tokens": 256,
+    "eval_ms": 4880.6,
+    "decode_tok_per_s": 52.45,
+    "load_ms": 159.8,
+    "total_ms": 5368.3,
+    "harness_wall_s": 5.429,
+    "done_reason": "length"
+  },
+  "summary": {
+    "prefill_tok_per_s": {
+      "min": 14201.36,
+      "median": 14326.07,
+      "max": 14448.45,
+      "n": 3
+    },
+    "decode_tok_per_s": {
+      "min": 52.4,
+      "median": 52.42,
+      "max": 52.45,
+      "n": 3
+    },
+    "total_ms": {
+      "min": 5120.3,
+      "median": 5124.5,
+      "max": 5128.9,
+      "n": 3
+    }
+  }
+}