Add bidirectional Markdown/RTF conversion#33
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Implement Markdown → RTF and RTF → Markdown conversion using NSAttributedString, with library API, CLI commands, and tests. Library: RTFConverter walks AST to build attributed strings with formatted headings, bold, italic, code, links, lists, and blockquotes. RTFGenerator uses font-size/weight heuristics to detect headings, monospace detection for code blocks, and attribute enumeration for inline formatting. CLI: `md-utils convert to-rtf` and `md-utils convert from-rtf` follow the existing ToText pattern with stdin/file/batch modes. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
RTFConverter) usingNSAttributedString, supporting headings, bold, italic, inline code, code blocks, links, lists, blockquotes, strikethrough, and thematic breaksRTFGenerator) using font-size/weight heuristics for heading detection, monospace detection for code blocks, and attribute enumeration for inline formattingmd-utils convert to-rtfandmd-utils convert from-rtfCLI commands following existingToTextpattern (stdin/file/batch modes)Closes #13
Test plan
swift test)swift run md-utils convert to-rtf --helpshows correct usageswift run md-utils convert from-rtf --helpshows correct usageswift run md-utils convert to-rtf README.md -o test.rtf→ open in TextEdit → verify formattingswift run md-utils convert from-rtf test.rtf→ verify Markdown output🤖 Generated with Claude Code