Store assets: App Store header, search results, iPhone 6.3 and foldable sizes

Adds ios/header, ios/search-results, ios/iphone-6.3in and ios/iphone-fold-*
to compose.py and the README upload table.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

distribution/store-assets/README.md

@@ -34,8 +34,18 @@ Schibsted Grotesk / Instrument Sans), flat shapes, alternating light and dark.
 | Google Play 7-inch tablet, landscape | `android/tablet-7in-landscape/` | 1920 × 1200 |
 | Google Play 10-inch tablet, landscape | `android/tablet-10in-landscape/` | 2560 × 1600 |
 | App Store iPad screenshots, landscape (13" slot) | `ios/ipad-landscape/` | 2752 × 2064 |
+| App Store iPhone 6.1" / 6.3" screenshots | `ios/iphone-6.3in/` | 1206 × 2622 |
+| App Store iPhone Duo (foldable), portrait | `ios/iphone-fold-portrait/` | 2007 × 2853 |
+| App Store iPhone Duo (foldable), landscape | `ios/iphone-fold-landscape/` | 2853 × 2007 |
+| App Store header | `ios/header/` | 5244 × 2950, 3840 × 1646 |
+| App Store search results | `ios/search-results/` | 5244 × 2950, 3840 × 2560, 1920 × 1280 |
 | iOS icon reference | `ios/icon-1024.png` | 1024 × 1024 |
 
+The iPad 13" slot (2064 × 2752 and 2752 × 2064) is covered by `ios/ipad/` and
+`ios/ipad-landscape/`. The header and search-results banners are one brand
+design (name, tagline, iPad and iPhone) rendered at each size. App previews
+(video) are not produced here.
+
 Upload in numeric order. The App Store uses the icon embedded in the uploaded
 build; `ios/icon-1024.png` is only a reference copy. Screenshots, the feature
 graphic and the iOS icon are opaque RGB PNGs; the Play icon is 32-bit RGBA.