docs(ios): clean up AppBridgeViewController registration comments

Replace the transitional Phase 2B-1 comments (which referenced a temporary
AppDelegate registration safety net) with a concise description of the
plugin registration now that it is finalized. Comment-only change; plugin
registration behavior is unchanged.

ios/App/App/AppBridgeViewController.swift

@@ -4,10 +4,9 @@
 //
 //  Capacitor bridge view controller subclass.
 //
-//  Phase 2B-1: registers the app-local SharedImagePlugin from the deterministic
-//  capacitorDidLoad() lifecycle callback, where the Capacitor bridge is
-//  guaranteed to exist. The existing AppDelegate registration is intentionally
-//  left in place as a temporary safety net during this phase.
+//  Registers the app-local SharedImagePlugin once the Capacitor bridge
+//  has been created. This provides deterministic plugin registration
+//  before the web layer starts executing.
 //
 
 import UIKit
@@ -18,11 +17,6 @@ class AppBridgeViewController: CAPBridgeViewController {
     override func capacitorDidLoad() {
         super.capacitorDidLoad()
 
-        // Register the app-local SharedImage plugin using the same approach as
-        // AppDelegate. The @objc(SharedImage) annotation exposes it as
-        // "SharedImage" to JavaScript. At this point the bridge is guaranteed
-        // to be available (capacitorDidLoad runs immediately after the bridge
-        // is created).
         let pluginInstance = SharedImagePlugin()
         bridge?.registerPluginInstance(pluginInstance)
         print("[AppBridgeViewController] ✅ Registered SharedImagePlugin (exposed as 'SharedImage' via @objc annotation)")