0.4.0

Add image download and processing support

• Download embedded images from PR body, comments, reviews, and review comments
• Support both Markdown () and HTML () image references
• Validate downloaded files by checking magic bytes (PNG, JPG, GIF, WebP, BMP, ICO, SVG)
• Detect and skip HTML error pages mistakenly downloaded as images
• Handle GitHub S3 signed URLs and redirects (up to 5 hops)
• Update markdown to reference local image paths
• Add JSON output format (--format json)
• Add new CLI options: --download-images, --include-reviews, --format, --verbose

Related Pull Request: #8

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