perf(navara): resolve MSAA at geometry stages

Keep four-sample geometry and depth while using single-sample postprocessing buffers. Preserve forward and overlay coverage, skip empty transfers, and add matched pixel and regression checks.

scripts/format-scope.json

@@ -1270,5 +1270,7 @@
   "src/layers/recentImagery/render/tiles.test.mjs",
   "src/layers/recentImagery/render/navara.test.mjs",
   "src/ui/imageryBoxNavara.test.mjs",
-  "scripts/qa-w2-imagery.mjs"
+  "scripts/qa-w2-imagery.mjs",
+  "src/globe/navara/postSamplingPass.test.mjs",
+  "scripts/qa-post-sampling.mjs"
 ]

scripts/package-boundaries.json

@@ -2669,6 +2669,8 @@
       "src/globe/navara/movers/pack.js",
       "src/globe/navara/movers/frameCamera.js",
       "src/globe/navara/overlayPass.js",
+      "src/globe/navara/postSampling.js",
+      "src/globe/navara/postSamplingPass.js",
       "src/globe/navara/movers/modelMover.js",
       "src/globe/navara/movers/modelTint.js",
       "src/globe/navara/movers/index.js",