fix: dispose pending infrastructure loads and entity contexts

CHANGELOG.md

@@ -13,6 +13,9 @@ of current runtime behavior, see [`docs/CURRENT-STATE.md`](docs/CURRENT-STATE.md
 
 ## [Unreleased]
 
+- Local GeoJSON layers share concurrent loads, cancel pending fetches on destruction,
+  discard late results, and remove their entity-context records on teardown.
+
 - Unchanged local infrastructure overlays no longer sustain idle rendering.
   Ground samples wait for visible terrain to settle and cannot place a marker
   below its loaded surface; roofs and valid below-sea-level heights are retained.