Data-only contributions: per-model JSON registry, validation, PR CI

Contributors no longer touch site code. Model registration moves from
cases.ts literals to repo-root models/<model-id>.json files (filename =
model id = outputs/ folder); cases move to cases.json; cases.ts now just
derives MODELS/RUNS via import.meta.glob. Parallel PRs stop conflicting
because each model owns its own file.

scripts/validate-data.ts runs inside `bun run build` and a new PR CI
workflow: dash-only ids, required bilingual provenance note per run,
declared artifacts must exist, no orphan outputs/ dirs.

Also: run notes render whitespace-pre-wrap (multi-line notes, idea from
PR #2), README contribution guide rewritten around the JSON template,
CLAUDE.md updated, OG card refreshed for the DeepSeek merge.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

models/gpt-5-5-pro.json

@@ -0,0 +1,13 @@
+{
+  "label": "GPT-5.5 Pro",
+  "vendor": "OpenAI",
+  "order": 20,
+  "runs": {
+    "mythos-craft": {
+      "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."
+      }
+    }
+  }
+}