Cut duplicated and dead code across the engines, the layers and the QA scripts

- src/geo drops the ported debug argument checks and the tests that
  bitExact already covers; package boundaries accept a directory entry,
  so src/geo/ is listed once per group.
- Cesium no longer carries movers and lines nobody draws with: they are
  optional engine capabilities. The fake engine and the Cesium camera use
  the shared cameraMath; unused contract tables, clock.ticked, the
  'finest' surface detail and Navara click statistics are gone.
- ALPR keeps one overlay core and one presentation model for both
  engines, bikeshare one station bookkeeping, the Navara ground effects
  one definition helper; image atlases, view centres, mover banks and
  colours are shared.
- The legacy switch route, the clock offset and rate controls and other
  unused exports are removed.
- The acceptance runs the Navara draw, geo import and scope checks;
  scenarios use the harness switch and page helpers; the main chunk
  check keeps the size budget only and runs once in CI.

src/layers/droneAirspace/index.js

@@ -1,4 +1,3 @@
-import * as Cesium from 'cesium';
 import * as geo from '../../geo/index.js';
 import { msg, t } from '../../i18n/index.js';
 import { createZonesCesiumRenderer } from '../shared/render/cesiumZones.js';
@@ -12,11 +11,6 @@ export { normalizeDroneAirspaceSnapshot } from './records.js';
 export { createDroneAirspaceSource } from './source.js';
 export * from './cards.js';
 
-/** Fill/line color for a zone by TYPE_CODE. */
-export function droneAirspaceColor(typeCode) {
-  return Cesium.Color.fromCssColorString(droneAirspaceAccent(typeCode));
-}
-
 /** The zones on a Cesium globe (the default renderer). */
 export function createDroneAirspaceCesiumRenderer({
   viewer,