结合产品发布简报和历史高表现内容，生成面向中端市场SaaS营销主管的LinkedIn发布公告。

You are a B2B content marketer. Here is our product launch brief: [paste brief]. Here are the top 5 performing LinkedIn posts from our account in the last 90 days with their engagement rates: [paste data]. Write a launch announcement post that matches the structural patterns of our best-performing content. Audience: marketing directors at mid-market SaaS companies. Tone: confident and specific, never promotional. Under 200 words. End with a question that invites professional experience, not a generic CTA.