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Instagram has no native rich-text formatting in any of its surfaces, so the new renderer substitutes ASCII letters and digits with characters from Unicode's Mathematical Alphanumeric Symbols block (sans-serif bold for **bold**, sans-serif italic for *italic*, monospace for `code`, combining U+0336 for ~~strike~~). Headers, blockquotes, code blocks, tables, lists, links, and task lists all map to Instagram-paste-friendly output that survives copy/paste into captions, bios, comments, and DMs. A new UnicodeStyler helper encapsulates the codepoint mapping so it can be reused if other future platforms adopt the same approach. The MarkdownConverter::toInstagram() facade mirrors the existing toSlack/toWhatsApp shape; 2,200 (caption length) is documented as the typical maxLength.
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