We need to follow constraints.
We must output ONLY the requested block at the absolute beginning, followed immediately by the rewritten content. No intro notes.
Tasks:
1. Clean text content by removing promotional lines, “SEE ALSO” links, and footer junk. So we need to strip promotional lines (like “Get CryptoSlate’s essential stories…”, newsletter signup messages, etc.) and footer junk (like “Published on Substack”, etc.) and any “SEE ALSO” links (none visible). Also remove promotional lines, “SEE ALSO” links, footer junk.
We must preserve all HTML media elements: tags, video