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-cctv-v2.mjs

@@ -42,7 +42,7 @@
  *
  * This legacy harness is the geometry, lifecycle and real-input oracle.
  * Migration runs use headless Metal and strict runtime error observation.
- * Screenshots remain visual-review evidence here; the W2 companion must
+ * Screenshots remain visual-review evidence here; a separate pixel gate must
  * independently prove actual marker, image-plane and video pixels.
  *
  * No `cesium` package import for in-page math: the app does not expose a
@@ -2245,7 +2245,7 @@ async function main() {
 
     // -----------------------------------------------------------------------
     // Screenshots supplement this state/geometry oracle. Positive rendered
-    // media pixels are a separate mandatory W2 companion gate.
+    // media pixels are a separate mandatory pixel gate.
     // -----------------------------------------------------------------------
     await sleep(1000);
     const shot = path.join(SHOTS_DIR, 'cctv-v2-active.png');