feat: add a recent satellite imagery tool

Add get_recent_imagery. It searches the recent Harmonized Landsat and
Sentinel-2 catalog for an area, picks the image the layer would show
with the layer's own ranking, and returns it with its date, sensor and
cloud cover, falling back to the VIIRS daily overview.

scripts/format-scope.json

@@ -880,5 +880,6 @@
   "src/tools/queries/maritime.test.mjs",
   "src/tools/queries/share.test.mjs",
   "src/tools/localRoute.test.mjs",
-  "src/tools/queries/atmosphere.test.mjs"
+  "src/tools/queries/atmosphere.test.mjs",
+  "src/tools/queries/imagery.test.mjs"
 ]