docs: update all remaining references to use upstream tools directly

- docs/README_en.md: update FAQ, Works Out of the Box, Design Philosophy
- docs/troubleshooting.md: Exa fallback uses mcporter directly
- agent_reach/guides/setup-exa.md: test with mcporter call
- agent_reach/guides/setup-wechat.md: test with Jina Reader

agent_reach/guides/setup-exa.md

@@ -22,8 +22,8 @@ mcporter config add exa https://mcp.exa.ai/mcp
 
 ### 3. 验证
 ```bash
-agent-reach doctor | grep "Web Search"
-agent-reach search "test" -n 1
+agent-reach doctor | grep "Search"
+mcporter call 'exa.web_search_exa(query: "test", numResults: 1)'
 ```
 
 ## 需要用户手动做的步骤

agent_reach/guides/setup-wechat.md

@@ -18,7 +18,7 @@ playwright install chromium
 
 3. 安装完成后测试：
 ```bash
-agent-reach read "https://mp.weixin.qq.com/s/一个测试链接"
+curl -s "https://r.jina.ai/https://mp.weixin.qq.com/s/一个测试链接" -H "Accept: text/markdown"
 ```
 
 ## 需要用户手动做的步骤