Redesign Home and retire Personal Posts

[130U]

Summary

• replace outdated current-role framing with durable Home and Current Chapter copy
• add a Home-only Three.js particle morph with accessible static fallbacks
• retire Personal Posts routes, content, assets, tests, and maintenance documentation
• refresh Open Graph artwork and strengthen preservation checks for Education and Past Experience

Why

The previous Home and Current Chapter narrative, plus the social preview, described an outdated role. Personal Posts is no longer part of the site. This update keeps the remaining four-section information architecture coherent while preserving the Education and Past Experience copy exactly.

Impact

• public route manifest moves from 11 routes to 9
• Home gains progressive particle typography with reduced-motion, WebGL, and no-JavaScript fallbacks
• /personal-posts/ now resolves to the site's noindex 404
• main remains unchanged until this draft PR is reviewed and merged

Validation

• npm.cmd run check — lint, TypeScript, production build, and 13/13 artifact tests passed
• npm.cmd audit --omit=dev — 0 vulnerabilities
• git diff --check passed
• Education and Past Experience protected sources have zero diff from b6a14e9
• responsive browser QA completed at 1440, 720, 390, and 320 px