A profile/instance whose config says provider:'maplibre' now generates a page
that loads the MapLibre peer (jsdelivr, same versions as useMapInstance) and
mounts IMMEDIATELY — the token ladder is skipped entirely. Mapbox pages are
unchanged. demo-map (the example vibe coders copy) is now provider-aware via
resolveMapProvider, and ships a 'maplibre' instance as the living token-free
demo. embed-smoke covers instance pages; verified 2/2 with live canvases —
including the maplibre one with NO token anywhere.