refactor(expo-native): remove legacy client sync bridge

Remove configure, getClientToken, syncClientStateFromJs and the
clerkNativeClientChanged event from the iOS and Android ClerkExpo module,
along with the client observation loop and JS-sync suppression state that
only served them. The JS engine now uses configureNative, getDeviceToken,
setDeviceToken, refreshClient and clerkNativeClientInvalidated.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Author: mikepitre

.changeset/remove-legacy-expo-native-sync.md

@@ -0,0 +1,2 @@
+---
+---

packages/expo-native/android/src/main/java/expo/modules/clerk/ClerkAuthViewModule.kt

@@ -64,7 +64,7 @@ class ClerkAuthNativeView(context: Context, appContext: AppContext) : ClerkCompo
   private val onHostBack by EventDispatcher()
 
   init {
-    // At cold start, ClerkExpoModule.configure() may run before React's
+    // At cold start, ClerkExpoModule.configureNative() may run before React's
     // host-resume sync, so this view's construction is a reliable second hook.
     activity?.let { Clerk.attachActivity(it) }
   }