iter(g154): MCP 搜索补组件级命中

原 search_components 只搜包级字段，命中后返回包，Agent 还得再猜组件 id。
改为返回 { packages, components } 两级，组件按 id / 标题 / props 名命中并带 package。

.ua/backlog.json

@@ -1588,6 +1588,14 @@
       "acceptance": "ua search a b 取各词命中的最弱档做 AND 过滤仍保持 id>标题>props>步骤 的排序；未命中输出相近建议并 exit 1；无参数打印用法。",
       "notes": "",
       "status": "done"
+    },
+    {
+      "id": "g154",
+      "title": "MCP search_components 补组件级命中",
+      "motivation": "原实现只在包级字段（name/description/tags/api.exports）里搜，命中后只返回包：Agent 搜「日期」得到 @ui-arch/ui，还得再猜组件 id。",
+      "acceptance": "返回 { packages, components } 两级结构，components 按 id/标题/props 名命中并带 package 字段；空 query 与无命中都抛明确错误；工具描述同步。",
+      "notes": "",
+      "status": "open"
     }
   ]
 }

packages/tools/cli/bin/ua.js

@@ -566,7 +566,7 @@ function cmdMcp() {
     },
     {
       name: 'search_components',
-      description: 'Search packages by keyword across name/description/tags/api',
+      description: 'Search by keyword: returns matched packages plus matched components (id/title/props)',
       inputSchema: {
         type: 'object',
         properties: { query: { type: 'string' } },
@@ -619,8 +619,9 @@ function cmdMcp() {
       return { package: hit.pkg.name, ...hit.comp, recipes: recipesFor(hit.comp.id) };
     }
     if (name === 'search_components') {
-      const q = String(args.query ?? '').toLowerCase();
+      const q = String(args.query ?? '').toLowerCase().trim();
-      return packages
+      if (!q) throw new Error('query 不能为空');
+      const pkgs = packages
         .filter((p) =>
           [p.name, p.description, p.type, ...(p.tags ?? []), ...(p.api?.exports ?? [])]
             .join(' ')
@@ -628,6 +629,13 @@ function cmdMcp() {
             .includes(q),
         )
         .map((p) => ({ name: p.name, version: p.version, type: p.type, description: p.description }));
+      const comps = collectComponents(packages) // 组件级命中：包级 exports 只给出包名，Agent 还得再查一次
+        .filter(({ comp }) =>
+          [comp.id, comp.title, ...(comp.props ?? []).map((p) => p.n)].join(' ').toLowerCase().includes(q),
+        )
+        .map(({ pkg, comp }) => ({ package: pkg.name, id: comp.id, title: comp.title }));
+      if (!pkgs.length && !comps.length) throw new Error(`no match: ${args.query}`);
+      return { packages: pkgs, components: comps };
     }
     if (name === 'get_tokens') {
       const list = loadTokenList();