Expo Modules are not a platform layer

• mobile

Research on using Expo Modules in a non-React-Native JS host:

• On Android, AppContext takes a WeakReference<ReactApplicationContext> and requires it. There is no bridge-free constructor.
• JSI installer JNI entry points take com.facebook.react.bridge.RuntimeExecutor and CallInvokerHolderImpl by signature. A shim must match these.
• A non-RN host needs its own layer for JS engine, event loop, rendering, platform capabilities and lifecycle. Check Apple guideline 2.5.2 for downloaded code.