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-sprites-b5.mjs

@@ -54,7 +54,7 @@ const getOpt = (name, dflt) => {
 };
 
 const BASE_URL = getOpt('--url', 'http://localhost:4173');
-// --engine=cesium|navara (phase 3): without a viewer the layer is read through
+// --engine=cesium|navara: without a viewer the layer is read through
 // the QA probe (window.__godsEyeView.layers.drawn) and the military checks are
 // skipped where the engine has no military layer.
 const ENGINE = (argv.find((arg) => arg.startsWith('--engine=')) ?? '--engine=cesium').slice(9);