Add AI's Compounding Disinterest Pt 1 blog post

[riccjohn]

Summary

• Adds new blog post: AI's Compounding Disinterest, Pt 1: The Echo Chamber of the Status Quo
• Includes AI recommendation cycle SVG diagram (generated via Mermaid playground)
• Updates CaptionedImage component to accept string | ImageMetadata for SVG URL support
• Adds LinkedIn and Bluesky social media teasers

Test plan

• Verify post renders correctly at /blog/ais-compounding-disinterest-pt-1/
• Verify diagram SVG displays correctly at all viewport sizes
• Verify CaptionedImage still works with existing ImageMetadata usages

🤖 Generated with Claude Code

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