Declare a component instead of a prepare block

Same command, said as what this project produces. See dev-updater's
commit for the model.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QQz6R4kBQcWSHBNZMgBnjL

app/.dev-updater.ron

@@ -1,12 +1,11 @@
 // Read by Dev Updater. Structured as the body of the config: no outer
 // parentheses, so nothing here is indented for the sake of a wrapper.
 
-// Enough to add this project before it has ever been built: with nothing
-// built there is no APK to read an identity out of. A built APK wins over
-// both of these wherever there is one.
-package: "com.example.aiapp",
 label: "AI Sessions",
 
-prepare: (
-    command: "./build-apk.sh",
+components: [
+    Apk(
+        name: "app",
+        build: "./build-apk.sh",
     ),
+],