feat: add a submarine cable tool

Add find_submarine_cables over the bundled TeleGeography data: cables
passing through or landing in an area, or matching a name, with landing
points and the dataset's attribution. The local MCP server's fetch reads
the bundled data files a browser would load by URL, and nothing outside
that directory.

scripts/format-scope.json

@@ -881,5 +881,6 @@
   "src/tools/queries/share.test.mjs",
   "src/tools/localRoute.test.mjs",
   "src/tools/queries/atmosphere.test.mjs",
-  "src/tools/queries/imagery.test.mjs"
+  "src/tools/queries/imagery.test.mjs",
+  "src/tools/queries/cables.test.mjs"
 ]