Scaffold native Android build and enforce Rust boundaries (#89)

android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,10 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionSha256Sum=dce76f55f8e251a3a1f130eb120f30b3d271de2b76c9b0729d316b5a1b6dc01f
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.8.1-bin.zip
+networkTimeout=10000
+retries=0
+retryBackOffMs=500
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists