feat: 增加共享 Agent Browser 调试能力

需求：在 AI 编程会话中让用户与 Agent 共享同一浏览器页面，并查看控制台与网络信息。

实现：新增沙箱浏览器内核、Host API/渲染器面板、OpenCode 工具接入及安全边界测试。

tests/unit/opencode-manager.test.ts

@@ -15,6 +15,7 @@ import { afterEach, describe, expect, it, vi } from 'vitest';
 import { OpencodeManager } from '@electron/opencode/manager';
 import {
   ensureBundledSuperpowersPlugin,
+  resolveBundledAgentBrowserPluginPath,
   resolveBundledSuperpowersDir,
 } from '@electron/opencode/superpowers';
 import { logger } from '@electron/utils/logger';
@@ -82,6 +83,23 @@ describe('OpencodeManager', () => {
     })).toBe(join(resourcesPath, 'resources', 'skills', 'superpowers'));
   });
 
+  it('resolves the bundled Agent Browser plugin from the course skills bundle', () => {
+    const resourcesPath = 'C:\\Program Files\\Makelore\\resources';
+
+    expect(resolveBundledAgentBrowserPluginPath({
+      isPackaged: true,
+      resourcesPath,
+      appPath: 'C:\\Program Files\\Makelore\\resources\\app.asar',
+    })).toBe(join(
+      resourcesPath,
+      'course-skills',
+      'agent-browser',
+      '.opencode',
+      'plugins',
+      'niancode-agent-browser.js',
+    ));
+  });
+
   it('spawns the bundled opencode server and becomes running after listening output', async () => {
     const { children, calls, spawn } = createSpawnHarness();
     const manager = new OpencodeManager({
@@ -858,6 +876,50 @@ describe('OpencodeManager', () => {
     }
   });
 
+  it('installs the bundled Agent Browser tool plugin before spawning', async () => {
+    const userDataDir = mkdtempSync(join(tmpdir(), 'niancode-opencode-manager-'));
+    const sourceDir = mkdtempSync(join(tmpdir(), 'niancode-agent-browser-plugin-source-'));
+    const sourcePluginPath = join(sourceDir, 'niancode-agent-browser.js');
+    try {
+      writeFileSync(
+        sourcePluginPath,
+        'export const NianCodeAgentBrowserPlugin = async () => ({});\n',
+      );
+
+      const { children, spawn } = createSpawnHarness();
+      const manager = new OpencodeManager({
+        port: 4337,
+        binPath: '/opt/opencode',
+        userDataDir,
+        bundledAgentBrowserPluginPath: sourcePluginPath,
+        runtimeConfigProvider: () => ({ config: {}, env: {} }),
+        spawn,
+      });
+
+      const startPromise = manager.start();
+      children[0].stdout.emit(
+        'data',
+        Buffer.from('opencode server listening on http://127.0.0.1:4337\n'),
+      );
+      await startPromise;
+
+      const installedPluginPath = join(
+        userDataDir,
+        'opencode',
+        'niancode-config',
+        'plugins',
+        'niancode-agent-browser.js',
+      );
+      expect(existsSync(installedPluginPath)).toBe(true);
+      expect(readFileSync(installedPluginPath, 'utf8')).toContain(
+        'NianCodeAgentBrowserPlugin',
+      );
+    } finally {
+      rmSync(userDataDir, { recursive: true, force: true });
+      rmSync(sourceDir, { recursive: true, force: true });
+    }
+  });
+
   it('removes retired bundled skills from the managed config before spawning', async () => {
     const userDataDir = mkdtempSync(join(tmpdir(), 'niancode-opencode-manager-'));
     const bundledCourseSkillsDir = mkdtempSync(join(tmpdir(), 'niancode-course-skills-source-'));