Builds an X (Twitter) thread — one scroll-stopping opener, 5–9 self-contained body tweets, a CTA close — with a python3 character-count check on every tweet. Use when the user asks for an "X thread", "Twitter thread", "thread about [topic]", "tweetstorm", or wants long-form content broken into tweets. Don't use for single tweets (draft directly), LinkedIn posts (linkedin-content-pack), or fanning one piece across many platforms (content-repurposer).
