Release v1.12.0

Security

• (Severity: High) Markdown output now HTML-escapes text-node content before applying Markdown escaping, preventing attacker-controlled text such as <script> from turning into raw HTML when to_markdown() output is rendered.
• (Severity: Moderate) Sanitization now hardens script and style raw-text content by neutralizing embedded closing-tag sequences and dropping non-text children, preventing sanitized DOM trees from serializing into breakout HTML.