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-xhigh.json

@@ -9,13 +9,15 @@
       "note": {
         "zh": "全程在 Codex CLI 中生成（未使用任何 skill）；本页为修复版（仅改 1 行）。问题：移动向量的 Z 分量整体差一个负号（第 979 行，正确应为 -strafe*sin - forward*cos）。修复前：运动被沿 X 轴镜像——面朝 ±X 方向时按 A/D 左右颠倒，面朝 ±Z 时 W/S 前后颠倒，体感「左右移动方向不对」。原因：Three.js 相机在 yaw=0 时朝 -Z，推导前进/侧移向量时把这个约定弄反了。给 Z 分量取负后，任意朝向下八方向移动全部正确。",
         "en": "Generated entirely in Codex CLI (no skills); fixed build (1 line changed). Bug: the movement vector's Z component had its sign flipped (line 979; correct form is -strafe*sin - forward*cos). Before the fix movement was mirrored across the X axis — A/D swapped when facing +-X, W/S swapped when facing +-Z, i.e. \"strafing goes the wrong way\". Cause: a Three.js camera faces -Z at yaw 0, and the forward/right derivation inverted that convention. Negating Z makes all eight directions correct at any heading."
-      }
+      },
+      "contributor": "Nagi-ovo"
     },
     "pelican-cycling": {
       "note": {
         "zh": "由社区 PR #3（Codex 工作流）提交，提交者未注明运行环境与思考档位。",
         "en": "Contributed via community PR #3 (a Codex workflow); the submitter did not specify the runtime or effort level."
-      }
+      },
+      "contributor": "XA2333"
     }
   }
 }