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.

.github/workflows/ci.yml

@@ -59,7 +59,8 @@ jobs:
       - name: Build production bundle
         run: npm run build
 
-      - name: Main chunk (no three or Navara in Cesium mode; size budget when recorded)
+      - name: Main chunk size budget
+        if: matrix.node == '24.22.2'
         run: npm run check:main-chunk
 
   street-level-browser:
@@ -90,9 +91,6 @@ jobs:
           MAPILLARY_CLIENT_TOKEN: 'MLY|0|qa-fixture'
         run: npm run build
 
-      - name: Main chunk (no three or Navara in Cesium mode; size budget when recorded)
-        run: npm run check:main-chunk
-
       - name: Start the preview server
         env:
           MAPILLARY_CLIENT_TOKEN: 'MLY|0|qa-fixture'
@@ -154,6 +152,3 @@ jobs:
 
       - name: Build production bundle
         run: npm run build
-
-      - name: Main chunk (no three or Navara in Cesium mode; size budget when recorded)
-        run: npm run check:main-chunk