Contributor credits, SVG prefetch, integrate Xiaomi MiMo from PR #4

- Runs gain a contributor field (GitHub username); the site renders an
  avatar chip linked to their profile next to each run's notes, and CI
  validates the field. All existing runs are attributed.
- SVG variants of a case are prefetched during idle time, so switching
  model tabs swaps images without a network hiccup.
- Xiaomi MiMo v2.5 Pro (Claude Code, max effort) integrated from PR #4
  with both case runs and provenance notes; README registry tables
  updated.

Co-authored-by: DuJiabao <Jiabao.du@Yunzhisun.com>

models/gpt-5-5-pro.json

@@ -9,7 +9,8 @@
       "note": {
         "zh": "以 GPT-5.5 Pro（开启 Extended Pro）生成；本页为修复版（仅改 1 行）。问题：14 张贴图排成 8×2 图集、第二行只画了 6 格，UV 按左上原点计算却未设 flipY=false，两行贴图上下互换采样。修复前：草地顶面显示成黑曜石（地面全黑），树叶、沙子采到未绘制的空格（大片纯黑），放置方块的贴图互相串行、颜色诡异似反色。原因：CanvasTexture 默认 flipY=true，与自上而下的图集布局不匹配。加上 flipY=false 后地形与方块颜色全部正常。",
         "en": "Generated with GPT-5.5 Pro (Extended Pro enabled); fixed build (1 line changed). Bug: 14 tiles in an 8x2 atlas with only 6 slots drawn in row two, UVs computed from a top-left origin without flipY=false, so the two rows swapped on sampling. Before the fix: grass tops rendered as obsidian (black ground), leaves and sand hit undrawn slots (large black patches), and placed blocks wore each other's textures with inverted-looking colors. Cause: CanvasTexture defaults to flipY=true, mismatching the top-down atlas layout. With flipY=false everything renders correctly."
-      }
+      },
+      "contributor": "Nagi-ovo"
     }
   }
 }