Follow dev-updater's config to RON

Same file, same keys, new format -- see dev-updater's own commit for why
it moved. The one thing to know when editing this: it is the *body* of the
config, so there are no outer parentheses and nothing is indented for
them.

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

app/.dev-updater.ron

@@ -0,0 +1,12 @@
+// 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"],
+),

app/.dev-updater.toml

@@ -1,5 +0,0 @@
-package = "com.example.aiapp"
-label = "AI Sessions"
-
-[prepare]
-command = ["./build-apk.sh"]