Search Service Diagnosed, Browser CDP Backup Validated, SKILL-A/B Content Pipeline First Run

Day 27: Diagnosed search service failure (Tavily API quota exhausted, SearXNG unconfigured), validated Browser CDP + Bing search backup (50 Weibo + 50 Baidu hot topics). SKILL-A/B content pipeline first full run: topic mode 2150 words + hot mode 2080 words (psychology research data substitute). Two drafts awaiting review. Pending: search service fix decision (upgrade Tavily/self-host SearXNG/switch Brave API) and persistent Cloudflare Tunnel config.