5. Check and run

luastra/assets · UI.Image · UI.Shape · about 15 minutes

contain → cover → contain

Check verifies packaged asset admission; the browser preview separately verifies decoded pixels, sizing, clipping, and accessible presentation.

Run from visuals-recipe after the PNG and all three text files are saved.

check and test must report PASS with one passing test.
A successful build proves the file ledger and contract, not that every browser can decode arbitrary image bytes.
Resize and zoom the preview: the frame stays bounded while contain preserves the complete image and cover may crop it.

luastra check
luastra test
luastra run
# Expect the complete mark inside a 280 × 180 frame.
# Press Fill the frame: expect cropping and Fit: cover.