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.

docs/CODE-BOUNDARIES.md

@@ -55,7 +55,8 @@ See [application construction](APPLICATION.md) and the
 2. `scripts/check-package-boundaries.mjs` builds every declared export without
    app Vite configuration or environment files. `scripts/package-boundaries.json`
    assigns each export exactly once and lists its owned modules and external
-   dependencies. Unused imports still count. Node exports have only a `node`
+   dependencies; a module entry ending in `/` (such as `src/geo/`) owns every
+   file under that directory. Unused imports still count. Node exports have only a `node`
    condition; browser groups cannot use build-only dependency exceptions.
 
 Portable source graphs cannot reach application/rendering, Node, Cesium or