Creator supplied a new 2724x1536 image; resampled to the 1920x1080 master and encoded at q3
(2.9 MB → 424 KB, so the shipped asset also got smaller).
- `Assets/starting-background.jpg` — the new art, same filename, so nothing else changes
- `Assets/archive/starting-background-pre-2026-11-06.jpg` — the previous image, kept in the repo. The
csproj lists assets explicitly, so an unreferenced file never ships.
- **Existing layouts would have kept the old art forever**: default backgrounds are hash-keyed into the
layout DB on first seed, and the seed returns early once an AssetId exists. `HealDefaultArtVersion`
bumps `Art.DefaultVersion` to 2 and clears the AssetId of backgrounds still using the DEFAULT (a
creator's custom background is skipped), so the next load re-stamps the new image.
Background tests: 44 passed.
