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-strict-soak.mjs

@@ -156,9 +156,7 @@ strict.extra.soak = report;
 
 for (let run = 1; run <= runs; run++) {
   const start = run % 2 ? 'navara' : 'cesium';
-  const browser = await strict.launch({
-    args: ['--use-angle=metal', '--enable-gpu'],
-  });
+  const browser = await strict.launch();
   const row = { run, start, swaps: [], checkpoints: [], errors: [] };
   report.runs.push(row);
   try {