diff --git a/e2e/command-pairs.playwright.ts b/e2e/command-pairs.playwright.ts
new file mode 100644
index 0000000..87d67be
--- /dev/null
+++ b/e2e/command-pairs.playwright.ts
@@ -0,0 +1,10 @@
+// 双入口对拍的浏览器侧说明。CI 门禁在 backend command_pairs_test.go：
+// 新内置命令未写入 testdata/command-pairs.json 时 go test 失败。
+// 安装 Playwright 后可用 npx playwright test e2e/command-pairs.spec.ts 做人工抽查。
+import { test, expect } from '@playwright/test'
+
+test('command menu and chat share builtin.help', async ({ page }) => {
+  test.skip(!process.env.PLAYWRIGHT_BASE_URL, 'set PLAYWRIGHT_BASE_URL to run')
+  await page.goto(process.env.PLAYWRIGHT_BASE_URL!)
+  await expect(page.getByText('帮助')).toBeVisible()
+})
diff --git a/src/contracts.ts b/src/contracts.ts
index 5ec5349..754287d 100644
--- a/src/contracts.ts
+++ b/src/contracts.ts
@@ -249,7 +249,11 @@ export interface PluginManifest {
     tools?: string[]; workflows?: string[]; intents?: string[];
     prompts?: string[]; panels?: string[]; cards?: string[]; settings?: string[];
     commands?: string[]; workspaces?: string[];
+    skills?: string[]; mcpServers?: string[]; knowledge?: string[];
+    parsers?: string[]; agents?: string[]; channels?: string[]; pages?: string[];
   };
+  scope?: { tenants?: string[]; projects?: string[] };
+  backend?: { mode?: 'inproc' | 'sidecar'; command?: string; args?: string[]; schemaVersion?: number };
 }
 
 export interface PluginPanel {
@@ -261,6 +265,10 @@ export interface PluginWorkspace {
   badgeTool?: string; body: UINode[]; refreshTool?: string;
 }
 
+export interface PluginPageDecl {
+  id: string; title: string; module: string;
+}
+
 // ---- 摄取 / 检索 ----
 
 export interface ParsedDocument {
diff --git a/src/pluginHost.ts b/src/pluginHost.ts
new file mode 100644
index 0000000..a9131dc
--- /dev/null
+++ b/src/pluginHost.ts
@@ -0,0 +1,14 @@
+import type { PluginPageDecl } from './contracts'
+
+export interface PluginPageModule {
+  mount(el: HTMLElement, bridge: unknown): void
+  unmount?: () => void
+}
+
+// loadPluginPage 按声明加载 ESM。模块 URL 由插件页面声明给出，宿主不内嵌领域页面。
+export async function loadPluginPage(page: PluginPageDecl): Promise<PluginPageModule> {
+  if (!page.module) throw new Error(`plugin page ${page.id} missing module`)
+  const mod = await import(/* @vite-ignore */ page.module)
+  if (typeof mod.mount !== 'function') throw new Error(`plugin page ${page.id} has no mount`)
+  return mod as PluginPageModule
+}