feat: anti-detection hardening, transaction cache, article parsing, structured write output

Anti-detection:
- Add 6 sec-ch-ua-* Client Hints headers (arch, bitness, full-version, etc.)
- POST requests now send Referer: x.com/compose/post + Priority: u=1, i
- follow/unfollow REST adds include_profile_interstitial_type param

Performance:
- Transaction ID cache with 1h TTL (~/.twitter-cli/transaction_cache.json)
- resolve_user_id: auto-detect screen_name vs numeric user_id

Features:
- Twitter Article parsing: extract long-form content as Markdown
- Write operations emit structured JSON/YAML when piped or OUTPUT env set
  ActionResult: {success, action, id, url, ...}

84 tests passing

README.md

@@ -26,10 +26,10 @@ A terminal-first CLI for Twitter/X: read timelines, bookmarks, and user profiles
 - Tweet detail: view a tweet and its replies
 - List timeline: fetch tweets from a Twitter List
 - User lookup: fetch user profile, tweets, likes, followers, and following
-- JSON output: export any data for scripting and AI agent integration
+- Structured output: export any data as YAML or JSON for scripting and AI agent integration
 - Optional scoring filter: rank tweets by engagement weights
 
-> **AI Agent Tip:** Always use `--json` for structured output instead of parsing the default rich-text display. Use `--max` to limit results.
+> **AI Agent Tip:** Prefer `--yaml` for structured output unless a strict JSON parser is required. Non-TTY stdout defaults to YAML automatically. Use `--max` to limit results.
 
 **Write:**
 - Post: create new tweets and replies
@@ -88,12 +88,12 @@ twitter feed --input tweets.json
 
 # Bookmarks
 twitter bookmarks
-twitter bookmarks --max 30 --json
+twitter bookmarks --max 30 --yaml
 
 # Search
 twitter search "Claude Code"
 twitter search "AI agent" -t Latest --max 50
-twitter search "机器学习" --json
+twitter search "机器学习" --yaml
 twitter search "topic" -o results.json         # Save to file
 twitter search "trending" --filter              # Apply ranking filter
 
@@ -294,9 +294,9 @@ After installation, OpenClaw can call `twitter-cli` commands directly.
 - 推文详情：查看推文及其回复
 - 列表时间线：获取 Twitter List 的推文
 - 用户查询：查看用户资料、推文、点赞、粉丝和关注
-- JSON 输出：便于脚本处理和 AI agent 集成
+- 结构化输出：支持 YAML 和 JSON，便于脚本处理和 AI agent 集成
 
-> **AI Agent 提示：** 需要结构化输出时始终使用 `--json`，不要解析默认的富文本显示。用 `--max` 控制返回数量。
+> **AI Agent 提示：** 需要结构化输出时优先使用 `--yaml`，除非下游必须是 JSON。stdout 不是 TTY 时默认输出 YAML。用 `--max` 控制返回数量。
 
 **写入:**
 - 发推：发布新推文和回复