fix(twitter): migrate from deleted bird CLI to twitter-cli (#231)

steipete/bird repo has been deleted (404). Migrates to twitter-cli
(public-clis/twitter-cli, 2137 stars, Python, actively maintained).

Changes:
- twitter.py: check() now detects `twitter` binary, parses `twitter status` YAML
- cli.py: install via pipx/uv instead of npm, test via `twitter status`
- cli.py: remove bird/xfetch credential sync, use TWITTER_AUTH_TOKEN/CT0 env
- skill references: bird commands → twitter-cli commands
- tests: 5 new tests covering all check() paths

104 tests passing.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

agent_reach/skill/references/social.md

@@ -35,23 +35,30 @@ mcporter call 'douyin.extract_douyin_text(share_link: "https://v.douyin.com/xxx/
 
 > **无需登录**
 
-## Twitter/X (bird CLI)
+## Twitter/X (twitter-cli)
 
 ```bash
 # 搜索推文
-bird search "query" -n 10
+twitter search "query" --limit 10
 
-# 读取单条推文 (支持 /status/ 和 /article/ URL)
-bird read URL_OR_ID
+# 读取单条推文（含回复）
+twitter tweet URL_OR_ID
+
+# 读取长文 / X Article
+twitter article URL_OR_ID
 
 # 用户时间线
-bird user-tweets @username -n 20
+twitter user-posts @username --limit 20
 
-# 读取完整 thread
-bird thread URL_OR_ID
+# 用户资料
+twitter user @username
+
+# 首页时间线
+twitter feed --limit 20
 ```
 
-> **需要配置**: `agent-reach configure twitter-auth ...` 或通过环境变量配置。
+> **安装**: `pipx install twitter-cli` 或 `uv tool install twitter-cli`
+> **认证**: 设置 `TWITTER_AUTH_TOKEN` + `TWITTER_CT0` 环境变量，或确保浏览器已登录 x.com。
 
 ## 微博 / Weibo