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/claude-fable-5.json

@@ -9,13 +9,15 @@
       "note": {
         "zh": "在 Claude 网页版以 Fable 5 Max（最高思考强度）运行，过程中触发一次 auto compact 与工具调用上限，手动输入「继续」后完成；ID 水印与英文支持为事后在 Cursor 中用 Composer 2.5 Fast 一条提示词补加，其余均为一次生成。已知小问题：开局可能卡在一棵树里，按一下 G 即可脱身。",
         "en": "Run in the Claude web app on Fable 5 Max (max thinking effort); hit one auto-compact and the tool-call limit mid-run, finished after a manual \"continue\". The ID watermark and English support were patched in afterwards with a single prompt via Composer 2.5 Fast in Cursor; everything else is one-shot. Known quirk: you may spawn stuck inside a tree - press G once to get free."
-      }
+      },
+      "contributor": "Nagi-ovo"
     },
     "pelican-cycling": {
       "note": {
         "zh": "在 Claude 网页版以 Fable 5 Max（最高思考强度）一次生成。",
         "en": "Generated in one shot in the Claude web app on Fable 5 Max (max thinking effort)."
-      }
+      },
+      "contributor": "Nagi-ovo"
     }
   }
 }