Each rendered plant was fetching 12 files (base + 11 masks) at 0.4-1.5s
per request on the free tier - a cold garden load fired ~250 requests.
Build now packs all 542 images into a data-URI atlas emitted as a
hashed immutable asset; the client resolves art from it with in-memory
memoization of images, masks, and in-flight loads. Falls back to
network paths if the atlas is missing.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
