Revert #141: library stack shipped without image assets

.gitignore

@@ -15,7 +15,6 @@ frontend/.vite/
 
 # Local data assets
 data/
-frontend/public/assets/catalog_images/
 
 # Project save files at repo root (can contain large base64 images)
 /*.json

README.md

@@ -25,40 +25,6 @@ Then open `http://localhost:5173/`.
 - **Crop** — trim pattern or sheet edges
 - **Export** — save the project as JSON; import it back later
 
-## Glass swatch library data
-
-The app ships a built-in library of ~1,270 real glass sheet swatches (Bullseye,
-Oceanside, Wissmach, Youghiogheny). It has two parts:
-
-- `frontend/public/assets/glass_swatch_registry.json` — the registry (metadata,
-  image paths, physical calibration). **Committed to git**; the app's library
-  dialog reads it at runtime.
-- `frontend/public/assets/catalog_images/` — the swatch photos (~548 MB).
-  **Gitignored, not committed.** On a clean checkout the library dialog opens and
-  lists entries, but thumbnails show an "image not fetched" note until you run
-  the build script below.
-
-To fetch/refresh the images (and regenerate the registry) from the vendor
-catalogs, run from the repo root:
-
-```bash
-pip install requests Pillow   # script dependencies
-python3 scripts/build_swatch_library.py
-```
-
-The script scrapes the Bullseye and Stained Glass Express product feeds, scores
-every gallery image with the vendored swatch-picker (`scripts/swatch_picker.py`)
-to select genuine backlit sheet photos, applies watermark/border crops and
-physical-size calibration, and writes the registry plus a diff report to
-`docs/library-picker-rebuild/`. Re-runs are incremental: images are only
-re-downloaded when the picked photo actually changes, and an anti-churn rule
-keeps existing picks unless the picker's preference is decisive. Manual
-per-SKU overrides (Reactive Cloud crop, white-on-white picker false positives)
-are documented in the script itself.
-
-Optionally set `VITE_SWATCH_CDN_URL` at build time to serve the catalog images
-from an external host instead of `frontend/public/`.
-
 ## Tech
 
 - React + TypeScript + Vite