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.

scripts/qa-labels.mjs

@@ -314,8 +314,7 @@ async function main() {
       (ids) => ids.filter((id) => !window.__godsEyeView.layers.available(id)),
       fieldLayers,
     );
-    // An engine with flights but not the other field layers (Navara, W1 so
-    // far): the same 12,000 / 5,200 observations, all as aircraft, so the
+    // An engine with flights but not the other field layers: the same 12,000 / 5,200 observations, all as aircraft, so the
     // detection lane is measured on the layers the engine has.
     let fieldCounts = FIELD_COUNTS;
     let normalCounts = NORMAL_COUNTS;