chore(backlog): 记录 g78 完成

.ua/backlog.json

@@ -986,7 +986,7 @@
       "title": "新增 space 间距容器组件",
       "motivation": "库里 56 个组件都在各自实现里写 margin/gap，「一排按钮统一间距」「工具栏两端撑开」这类布局诉求没有承载物，演示页与业务方只能重复拼 style",
       "acceptance": "新增 space(props, ...children)：direction / size（sm|md|lg 走令牌，数字按像素）/ align / justify / wrap / block；manifest 参数表 + 手把手步骤 + api.exports 登记；demo 有 sec-space 区块真实调用；README 计数与分组同步；npm run check 全绿",
-      "status": "open",
+      "status": "done",
       "notes": "自补：布局基础件缺失；间距一律走 --ua-space-* 令牌，几何用内联 style 不进皮肤样式表"
     }
   ]

.ua/iterations.log

@@ -122,3 +122,4 @@
 {"ts":"2026-10-26T12:44:42+08:00","id":"g75","result":"done","commit":"b77eb18","summary":"评分组件补 tabindex 与每轮键绑定、重渲染后归还焦点，方向键可连按，补 focus-visible 光环"}
 {"ts":"2026-10-26T12:45:27+08:00","id":"g76","result":"done","commit":"45a00f6","summary":"文字头像容器补 role=img，aria-label 才会被读屏当作可访问名播报"}
 {"ts":"2026-10-26T12:46:11+08:00","id":"g77","result":"done","commit":"6b895bf","summary":"重新生成 CHANGELOG（226 提交），changelog:check 恢复一致"}
+{"ts":"2026-10-26T12:56:05+08:00","id":"g78","result":"done","commit":"b9261fb","summary":"新增 space 间距容器：flex gap 托管子元素间距，size 走令牌或像素，direction/align/justify/wrap/block 可调，清单与演示同步"}