site: media + colocation — chunk 1/4 (code, configs, docs)

Code, configs, README, CHANGELOG, sources/log files, .claude.
Subsequent chunks land the renamed media files.

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## May 2026
 
+- Colocate every collection's articles with their media: each entry is now a folder `<slug>/index.mdx` with sibling media files. Applied to `reviews/`, `find/` (104 articles + 89 heroes auto-resolved by `src/lib/find-hero.ts` via `import.meta.glob('../content/find/*/hero.{...}')`), `finds/`, and `posts/`. Slug derivation handled by a shared `stripIndex` helper on each glob loader; URLs unchanged across the entire site. MDX paths shortened from `../../assets/reviews/<slug>/<file>` to `./<file>`. `src/assets/` removed entirely
+- Media optimization pass: re-encode the 13 heaviest assets (h264 CRF 28, scale ≤1280px, audio stripped) and convert the two animated GIFs (cotypist, flux-markdown) to MP4 — `dist/` drops from 53 MB to 31 MB (~42% smaller); biggest single wins are `homerow/search.mp4` (6.7 MB → 1.6 MB), `antinote/links.mp4` (2.9 MB → 193 KB), `flux-markdown/demo.gif` (3.9 MB → 1.3 MB MP4). Originals preserved at `src/assets/reviews/<slug>/source/` and never bundled
+- Tile videos on `/` and `/grid/` switched from `preload="metadata"` to `preload="none"` so below-the-fold demos don't fetch on page load
+- `src/lib/hero.ts` and the cotypist/flux-markdown review MDX updated to render the new MP4 heroes as inline autoplay-loop muted `<video>` instead of `<img>`
 - Comprehensive SEO pass: new `<SEO>` component centralising every head-level tag (canonical, Open Graph, Twitter Card, theme-color, RSS alternate, JSON-LD); page-aware structured data — `Review` + `BreadcrumbList` on review pages, `BlogPosting` on posts, `Product` + `BreadcrumbList` on finds, `Article` + `ItemList` on finds superposts, `CollectionPage` + `ItemList` on category/tag/sources/blog pages, `WebSite` + `Organization` + `ItemList` on the home page, `AboutPage` on /about
 - Add `@astrojs/sitemap` (auto sitemap-index.xml excluding `/grid/`, `/index3/`, `/404/`) and `@astrojs/rss` (feed at `/rss.xml` covering reviews + posts + finds superposts); add `public/robots.txt` pointing at the sitemap
 - Add custom 404 page with recent reviews + nav fallback (noindex)