fix: 修复行缘、切分还原与语言解析并同步文档

保留逐字 margin／jiya.bias 字体后备方案；补齐 demo 重排、量测边界说明及共享规则 1.0.1 反例向量。

验证：完整构建通过，Node 376 项、WKWebView 64 项及原生 demo 9 项通过；Firefox 仍暂缓。

rules/golden-vectors.json

@@ -1,7 +1,7 @@
 {
   "$schema": "./golden-vectors.schema.json",
   "schemaVersion": 1,
-  "rulesetVersion": "1.0.0",
+  "rulesetVersion": "1.0.1",
   "vectors": [
     {
       "id": "locale-ja",
@@ -63,6 +63,48 @@
       "input": { "lang": "en" },
       "expected": { "langClass": "other" }
     },
+    {
+      "id": "locale-hans-private-hant",
+      "category": "language-classification",
+      "input": { "lang": "zh-Hans-x-hant" },
+      "expected": { "langClass": "zh-Hans" }
+    },
+    {
+      "id": "locale-tw-private-hans",
+      "category": "language-classification",
+      "input": { "lang": "zh-TW-x-hans" },
+      "expected": { "langClass": "zh-Hant" }
+    },
+    {
+      "id": "locale-latn-private-tw",
+      "category": "language-classification",
+      "input": { "lang": "zh-Latn-x-tw" },
+      "expected": { "langClass": "zh-Hans" }
+    },
+    {
+      "id": "locale-extension-hant",
+      "category": "language-classification",
+      "input": { "lang": "zh-CN-u-co-hant" },
+      "expected": { "langClass": "zh-Hans" }
+    },
+    {
+      "id": "locale-extlang-hans",
+      "category": "language-classification",
+      "input": { "lang": "zh-cmn-Hans-TW" },
+      "expected": { "langClass": "zh-Hans" }
+    },
+    {
+      "id": "locale-hant-cn",
+      "category": "language-classification",
+      "input": { "lang": "zh-Hant-CN" },
+      "expected": { "langClass": "zh-Hant" }
+    },
+    {
+      "id": "locale-empty",
+      "category": "language-classification",
+      "input": { "lang": "" },
+      "expected": { "langClass": "other" }
+    },
     {
       "id": "punct-stop",
       "category": "punctuation-classification",