Add raster imagery to the globe contract and draw FIRMS heat and Recent Imagery through it

engine.imagery draws raster layers over the globe: Web Mercator tile
templates and single images or canvases stretched over a rectangle, with
alpha, show, a left/right split against the engine's split position and
an order. A layer's source can be replaced in place.

- Cesium puts one ImageryLayer per layer on the globe's imagery stack,
  or on the shown 3D tileset's when the globe is hidden, and moves it
  when the surface changes; the Recent Imagery request gate moved here.
- Navara draws them in one screen pass after tone mapping that samples up
  to eight layers by geodetic position from mipmapped textures and a tile
  atlas, under the other drapes and engine.ground.
- The fake engine keeps each layer's state.

The FIRMS far-zoom heat raster and Recent Imagery now draw through it, so
FIRMS' heat seam and both its backends, and Recent Imagery's Cesium and
Navara renderers and tile plan, go. Against HEAD, Cesium's pixels are
identical in all four compared scenes; Navara's orbital heat changes by a
mean of 3.8 from new mipmapping, slightly towards Cesium. The contract
suite passes on both engines (Cesium 68/68, Navara 71/71).

engine.maps.addOverlay stays a Navara-only extension for Sea Marks and
Ski Pistes until imagery has a finer tile path for oblique global views.

scripts/package-boundaries.json

@@ -1601,7 +1601,6 @@
       "src/layers/recentImagery/source.js",
       "src/layers/recentImagery/model.js",
       "src/layers/recentImagery/catalog.js",
-      "src/layers/recentImagery/rendering.js",
       "src/layers/recentImagery/thumbnails.js",
       "src/maps/imageryHost.js",
       "src/i18n/index.js",
@@ -1638,7 +1637,6 @@
       "src/layers/firms/policy.js",
       "src/layers/firms/queries.js",
       "src/layers/firms/rendering.js",
-      "src/layers/firms/heatImagery.js",
       "src/layers/firms/selection.js",
       "src/layers/firms/source.js",
       "src/layers/firms/state.js",
@@ -2680,7 +2678,6 @@
       "src/layers/firms/policy.js",
       "src/layers/firms/queries.js",
       "src/layers/firms/rendering.js",
-      "src/layers/firms/heatImagery.js",
       "src/layers/firms/selection.js",
       "src/layers/firms/source.js",
       "src/layers/firms/state.js",
@@ -3194,7 +3191,6 @@
       "src/layers/recentImagery/source.js",
       "src/layers/recentImagery/model.js",
       "src/layers/recentImagery/catalog.js",
-      "src/layers/recentImagery/rendering.js",
       "src/layers/recentImagery/thumbnails.js",
       "src/maps/imageryHost.js",
       "src/ui/recentImagery.js",
@@ -3482,15 +3478,12 @@
       "src/layers/firms/rectangle.js",
       "src/layers/shared/render/navaraMoverBank.js",
       "src/layers/shared/render/moverBank.js",
-      "src/layers/recentImagery/render/navara.js",
       "src/layers/recentImagery/render/navaraGround.js",
-      "src/layers/recentImagery/render/tiles.js",
       "src/layers/cctv/render/navaraMeshes.js",
       "src/layers/alpr/overlay.js",
       "src/layers/alpr/presentation.js",
       "src/layers/radio/screenClusters.js",
       "src/layers/shared/render/imageAtlas.js",
-      "src/layers/firms/render/navaraHeat.js",
       "src/layers/shared/render/navaraGroundSurface.js",
       "src/layers/shared/render/navaraGroundEffect.js",
       "src/annotations/outlineRungs.js",
@@ -3570,8 +3563,6 @@
       "src/layers/ghostMaps/render/display.js",
       "src/layers/perimeters/render/display.js",
       "src/layers/gnss/render/display.js",
-      "src/layers/firms/render/cesiumHeat.js",
-      "src/layers/firms/render/heatField.js",
       "src/layers/firms/render/display.js",
       "src/layers/installations/render/style.js",
       "src/layers/awareness/render/cesiumPulses.js",
@@ -3583,7 +3574,12 @@
       "src/layers/directions/render/style.js",
       "src/layers/directions/render/display.js",
       "src/layers/streetLevel/render/display.js",
-      "src/layers/traffic/render/display.js"
+      "src/layers/traffic/render/display.js",
+      "src/layers/recentImagery/render/display.js",
+      "src/globe/navara/imagery/pass.js",
+      "src/globe/navara/imagery/index.js",
+      "src/globe/imagery.js",
+      "src/globe/cesium/imagery.js"
     ],
     "external": [
       "hls.js",
@@ -3816,7 +3812,6 @@
       "src/layers/firms/policy.js",
       "src/layers/firms/queries.js",
       "src/layers/firms/rendering.js",
-      "src/layers/firms/heatImagery.js",
       "src/layers/firms/selection.js",
       "src/layers/firms/source.js",
       "src/layers/firms/state.js",
@@ -4102,7 +4097,6 @@
       "src/layers/recentImagery/source.js",
       "src/layers/recentImagery/model.js",
       "src/layers/recentImagery/catalog.js",
-      "src/layers/recentImagery/rendering.js",
       "src/layers/recentImagery/thumbnails.js",
       "src/maps/imageryHost.js",
       "src/layers/streetLevel/index.js",
@@ -4311,8 +4305,6 @@
       "src/layers/droneAirspace/render/display.js",
       "src/globe/ground.js",
       "src/layers/ghostMaps/render/display.js",
-      "src/layers/firms/render/cesiumHeat.js",
-      "src/layers/firms/render/heatField.js",
       "src/layers/firms/render/display.js",
       "src/layers/infrastructure/render/display.js",
       "src/layers/installations/render/style.js",
@@ -4324,7 +4316,8 @@
       "src/layers/directions/render/style.js",
       "src/layers/directions/render/display.js",
       "src/layers/streetLevel/render/display.js",
-      "src/layers/traffic/render/display.js"
+      "src/layers/traffic/render/display.js",
+      "src/layers/recentImagery/render/display.js"
     ],
     "external": [
       "hls.js",