Function coreLayerConfigGet

Reads a loaded layer's authored config from the running core via the mounted GeoLeaf.GeoJSON.getLayerConfig(id) seam. Returns null when the accessor or the layer is absent. Per-layer feature-info bindings live under this config's capabilities.feature-info (v2.2.0+ canonical form).

This read stays on the runtime seam (rather than a static GeoJSONCore import) so the ported render pipeline behaves byte-identically to the pre-reclassification plugin.