review: put the character on the floor, split the cubes, commit the shots

The review floor was a 5 cm slab centred 50 cm down, so the character floated
1.8 m above it. The floor is now 90 m x 90 m x 10 cm with its top face at Z 0 and
the character measures Z 0..83 cm - feet on the plane.

Two cubes only: A on the ground as the contact/scale reference, B held at 2 m so
its cast shadow separates from the body for comparison. The scale-cubes camera
was still aimed at the old three-cube row and now looks at both from the south.

Screenshots are committed per the owner's instruction, and .gitignore no longer
excludes them.

.gitignore

@@ -57,7 +57,3 @@ Thumbs.db
 
 # Unreal per-project build artefacts (FileOpenOrder logs and the like)
 Build/
-
-# Screenshots: only the review README is tracked; PNGs stay on disk
-/Screenshots/
-!/Screenshots/README.md