Merge migration/phase2-engine (4aaf9746) into migration/phase3-layers

The phase-2 review fixes: look internals in internals.js, the groundFloor
resample throttle, tile height selection, the sharpen mirror, QA tile
cache limits, engine.groundFloor diagnostics. In navara/index.js both
sides are kept: the look gets internals.js's luminance uniforms and reads
the sun's time from the engine clock's frame time, so engine.clock stays
the one time source for the sun.

scripts/format-scope.json

@@ -1033,7 +1033,6 @@
   "src/globe/cesium/render.js",
   "src/globe/cesium/surface.js",
   "src/globe/contract.js",
-  "src/globe/navara/atmosphereLuminance.js",
   "src/globe/navara/cameraMath.js",
   "src/globe/navara/cameraMath.test.mjs",
   "src/globe/navara/cameraModel.js",