fix: Merge sections 8 and 9 in English post to match Korean version

fix: Merge sections 8 and 9 to eliminate redundancy in conclusion

fix: Simplify DeepImmutable explanation — drop code example, add door metaphor

fix: Add code example for DeepImmutable vs Readonly explanation

fix: Correct Context Collapse cache impact — not 'none' but 'minimal (one-time reset, then stable)'

fix: Convert custom diagrams from SVG to PNG for consistent rendering and lightbox support

fix: Embed Caveat handwriting font in SVGs, switch to <object> tag for font loading

fix: Replace hand-drawn fonts with system fonts for cross-device compatibility

fix: Replace '불변량' with consistent wording matching earlier explanation

fix: Update timeline SVG — sort Context era events chronologically, add Ralph to Harness era

fix: Escape dollar signs in English blog post to prevent markdown rendering issues

feat: Add new blog post — From Prompts to Harnesses: 4 Years of AI Agentic Patterns

fix: Deep readability polish — detailed concept explanations across all sections

fix: Apply same readability improvements to English architecture analysis post

fix: Polish readability — structure, titles, and wording