chore: remove four modules nothing in the app uses (#1403)

* chore: remove four modules nothing in the app uses

src/app/sourceSlot.js re-exported src/sources/sourceSlot.js, which every
caller imports directly. src/data/flowTiles.js and src/data/issPass.js were
reached only by their own tests. src/data/localGeojson.js wrapped
localGeojsonCore.js with the app's services, which the catalog already
passes itself. The local GeoJSON layer tests now build layers the way the
catalog does, so they keep covering localGeojsonCore.js; only the test of
the wrapper's own default host goes. Boundary lists, format scope and docs
drop the removed paths.

* docs: changelog for #1403

src/data/localGeojson.test.mjs

@@ -6,13 +6,14 @@ import {
   GROUND_SAMPLE_MAX_ARMED_RETRIES,
   LOCAL_OVERLAY_COHORT_LIMIT,
   LOCAL_STEM_TIP_EPSILON_M,
-  createLocalGeoJsonLayer,
+  createLocalGeoJsonLayer as createLayer,
   createLocalInfrastructureOverlayEntry,
   createLocalInfrastructureOverlayPublisher,
   localDatasetError,
   localInfrastructureOverlayCopy,
   selectLocalInfrastructureOverlayCohort,
-} from './localGeojson.js';
+} from './localGeojsonCore.js';
+import { localGeoJsonServices } from '../app/localGeojsonServices.js';
 import { layerFeedState } from './manager.js';
 import { INFRA_LOD_ACTIVE_MIN, INFRA_LOD_ACTIVE_MAX } from './localGeojsonLod.js';
 import {
@@ -21,6 +22,13 @@ import {
   _resetRenderGovernorForTest,
 } from '../renderGovernor.js';
 
+/** The catalog's services, with the overlay host each test supplies. */
+const createLocalGeoJsonLayer = (options) =>
+  createLayer(options, {
+    ...localGeoJsonServices,
+    overlayHost: options.overlayHost ?? localGeoJsonServices.overlayHost,
+  });
+
 class MockLayerEvent {
   constructor() {
     this.listeners = new Set();
@@ -1337,14 +1345,3 @@ test('globe-LOD re-selects during continuous motion, without ever seeing a moveE
   assert.deepEqual(env.layer.getLodDiagnostics(), parked, 'a parked camera never re-selects');
 });
 
-
-test('standalone publisher retains its default host for an undefined override', () => {
-  const publisher = createLocalInfrastructureOverlayPublisher({
-    sourceId: 'local-default-host-test', host: undefined,
-  });
-  assert.doesNotThrow(() => {
-    publisher.show();
-    publisher.hide();
-    publisher.destroy();
-  });
-});