The Driver's ask: one folder per BUNDLE with its ELEMENTS inside, bundles sorted by capability, highest
first. The rail listed every element flat under its own capability, so a bundle's elements were
scattered (gospel-resources' five screens sat in three sections). Now each capability section (5 → 1)
holds the bundles whose HIGHEST capability it is, in name order; a bundle with several elements is one
folder (country-posters, gospel-resources, my-upg-100-list, regions-dashboard, cities-internet), and a
single-element bundle is shown as its element. Composites keep their folded composition trees.
StudioTree identifies a plugin's row by a `canonical` flag rather than "depth 0", so auto-reveal opens
the bundle folder above an element chosen by URL or restored tab. New folder icon; 'elementsCount' and
'elements' in all 11 studio catalogues.
check:studio-rail (headless, gates:post) runs the studio's real rail code on the built manifest and
asserts the layout and one canonical node per plugin (21 bundles, 33 elements); it fails on the previous
rail. Also: poster.json:dpi is declared identical on purpose in check:i18n-never-translated (a unit
symbol kept as-is by project decision), which had turned that gate red on main.
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