feat(voice): add reusable geometry actions

- turn named places and mapped landmarks into reusable bounded areas
- count loaded records inside resolved, drawn and annotated geometry
- find recent imagery for an area, the view or the pointer snapshot
- keep osm place search behind an operator-configured overpass endpoint
- preserve cancellation, ownership and follow-up memory across every action
- cover geometry, provider lifecycle, cache isolation and voice routing

scripts/format-scope.json

@@ -697,6 +697,8 @@
   "src/sources/protocols.test.mjs",
   "src/voice/actionSchemas.js",
   "src/voice/actionSchemas.test.mjs",
+  "src/voice/areaCandidateContract.js",
+  "src/voice/layerActionOwnership.js",
   "server/providers/openai/toolDescriptions.js",
   "src/voice/session.js",
   "src/voice/sessionCommands.js",