Gallery loads the assembled theme config (not just base + plugins)
The static gallery (the visual-regression harness from WORK-409) transforms pages with merged.config — i.e. coreConfig plus the enabled plugins' configs — but never calls assembleThemeConfig. The site assembles core → plugins → theme so theme-level overrides reach the engine; the gallery does not, so it can only ever render base output.
This is a latent gap in the regression net: any override a theme applies via mergeThemeConfig (tints, icon swaps, and — after WORK-425 — per-rune defaultElevation/defaultProminence deltas) is invisible in the gallery. The gallery shows what a plugin ships, not what a theme actually renders.
Not a blocker for WORK-425. Under the agreed Option A, base surface defaults live in core + plugin configs, which the gallery already loads, so default data-elevation/data-prominence emission is gallery-verifiable today. This item only matters once a theme overrides those defaults (Lumina currently inherits the base defaults unchanged).