chore(backlog): 记录 g142 完成

.ua/backlog.json

@@ -1499,7 +1499,7 @@
       "motivation": "「A · B · C」这类一行多段信息（筛选摘要、面包屑式路径）只能手写 span 分隔符再逐个调 margin，gap 与分隔符混用后间距不均，读屏还会念出「·」",
       "acceptance": "space 新增 split：仅在 2 个以上子元素间插入分隔符，分隔符 aria-hidden、弱化色、不可选中；文档与演示同步；npm run check 全绿",
       "notes": "自补：既有组件可用性细节",
-      "status": "open"
+      "status": "done"
     }
   ]
 }

.ua/iterations.log

@@ -186,3 +186,4 @@
 {"ts":"2026-10-26T15:32:47+08:00","id":"g139","result":"done","commit":"08ceb8f","summary":"position 新增 flipSide 四向判定，tooltip 支持 left/right 并自动翻转；气泡定位与出场位移拆成两条规则，避免通用 .ua-open 覆盖方位"}
 {"ts":"2026-10-26T15:35:04+08:00","id":"g140","result":"done","commit":"e40cd2c","summary":"dataTable 新增 onRowClick：传了行变 tabindex=0 并响应点击/Enter/空格，未传保持纯展示；文件压到 199 行"}
 {"ts":"2026-10-26T15:36:29+08:00","id":"g141","result":"done","commit":"6cde618","summary":"notification 新增 placement 四角停靠：每角独立容器与 3 条上限，顶部角落 column-reverse 让新通知贴边出现"}
+{"ts":"2026-10-26T15:37:34+08:00","id":"g142","result":"done","commit":"5af2139","summary":"space 新增 split：只在 2 个以上子元素间插分隔符，aria-hidden + 弱化色 + 不可选中"}