M2b: Android skeleton, :core:model contract, :domain passing all vectors

Gradle project in android/ with every module of SPEC §6.2 (build-logic convention plugins, version catalog,
architecture check in check), :core:model types and repository interfaces of §14.2.4 and §14.5, :domain
implementing §14.5.2 and §14.5.4 (125 vector cases), scenario-driven fakes with the empty scenario, Room 3
entities and KvittDatabase v1 with exported schema, :app shell with Hilt, en/sv strings with MissingTranslation
as a lint error, Roborazzi goldens of the empty screen in light and dark.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tools/git-hooks/pre-commit

@@ -20,7 +20,7 @@ if [ -x "$top/android/gradlew" ] && [ -d "$top/android/core/model" ]; then
     *\"25*) ;;
     *) [ -d /opt/homebrew/opt/openjdk@25 ] && export JAVA_HOME=/opt/homebrew/opt/openjdk@25/libexec/openjdk.jdk/Contents/Home ;;
   esac
-  (cd "$top/android" && ./gradlew --quiet :core:model:test) || {
+  (cd "$top/android" && ./gradlew --quiet :core:model:test :domain:test) || {
     echo "pre-commit: Android fast tests failed (see above). Run tools/gradle-serial.sh check for the full picture." >&2
     exit 1
   }