Rename app_init to android_init

docs/PLAN.md

@@ -794,7 +794,7 @@ ssh case are one implementation.
 
 **An Iris Android application supplies an initialization function and its own
 state/resources; Iris supplies the JNI host and APK packager.**
-`#[iris::app_init]` marks the initializer Android calls when it creates the Iris
+`#[iris::android_init]` marks the initializer Android calls when it creates the Iris
 view. The macro target-gates the initializer and generates the single exported
 `JNI_OnLoad` plus the concrete `android-view` registration callback. The
 simple form mutates `AndroidUiState` through a reference. An application with