perf(navara): skip redundant empty-scene resolves

Preserve pending clears, backgrounds, callbacks, shadows and real geometry. Verify exact pixels and the underground depth-clear path; add controlled original-render comparison modes.

scripts/format-scope.json

@@ -1272,6 +1272,7 @@
   "src/ui/imageryBoxNavara.test.mjs",
   "scripts/qa-w2-imagery.mjs",
   "src/globe/navara/postSamplingPass.test.mjs",
+  "src/globe/navara/emptySceneRender.test.mjs",
   "scripts/qa-post-sampling.mjs",
   "scripts/qa-installation-stencil.mjs",
   "scripts/qa-installation-stencil-entry.mjs",

scripts/package-boundaries.json

@@ -2671,6 +2671,7 @@
       "src/globe/navara/overlayPass.js",
       "src/globe/navara/postSampling.js",
       "src/globe/navara/postSamplingPass.js",
+      "src/globe/navara/emptySceneRender.js",
       "src/globe/navara/movers/modelMover.js",
       "src/globe/navara/movers/modelTint.js",
       "src/globe/navara/movers/index.js",