research-map-plus-grid and regions-mfe draw a map through a child element, so their isMap is false,
and their published snippets had no engine preload and no scriptMapbox. A pasted composite still
draws on Mapbox given provider "mapbox" and a token (measured), so this is the snippet's
convenience, not a broken map.
generate-tree now decides after every profile's isMap is known: a composite (nested-elements-mfe)
whose OWN composes reach a map profile gets the map form of the default snippet and the Mapbox
variant. It reads the profile's own composes, never the bundle's hoisted list, which the bundle's
plain leaves (charts, data-tables, the poster wall) share while drawing nothing. The gallery shell
is left out until its passing of provider to its tabs is measured. Regenerated: exactly those two
profiles' embed changes, in both manifests; nothing internal leaks into the output.
check:snippet-engine asserts the same rule on the built manifest (21 map snippets, 19 maps + 2
composites). Its self-test adds a composite stripped of its variant, which fails. Against the
manifest as it stood before this change, the widened gate fails on exactly these two composites;
on the regenerated one it passes.
Every map profile's copy-paste snippet began with a preload of
api.mapbox.com's mapbox-gl.js, while its own profile-config said provider
"maplibre", and since 2026-09-28 only an explicit provider "mapbox" selects
Mapbox. So an unedited paste downloaded the Mapbox engine on every view,
never used it, and made a Mapbox request from a keyless page. Its only
guard was a stale comment asking the partner to delete the line.
- embed.script now preloads MapLibre's script and stylesheet, pinned the
way useMapInstance loads them so the preloads are reused, and its note
points a host who wants Mapbox at the variant.
- embed.scriptMapbox is that variant: the Mapbox preloads and the same
element with "provider":"mapbox".
- check:snippet-engine (gates:post, with a self-test) reads the built
manifest: no default snippet names api.mapbox.com, every map snippet
preloads MapLibre, and every Mapbox variant preloads Mapbox and sets its
provider. Planted: the old snippet and a provider-less variant both fail.
