diff --git a/.github/actions/cache-xcode-cas/action.yml b/.github/actions/cache-xcode-cas/action.yml
deleted file mode 100644
index 630e57906..000000000
--- a/.github/actions/cache-xcode-cas/action.yml
+++ /dev/null
@@ -1,25 +0,0 @@
-name: 'Cache Xcode CAS'
-description: 'Persist Xcode compilation cache (LLVM CAS) across CI runs'
-inputs:
-  key-suffix:
-    description: 'Cache key suffix (e.g. runner.os or iOS version from matrix)'
-    required: true
-  xcode-version:
-    description: 'Xcode version for the cache key'
-    required: false
-    default: '26.2'
-runs:
-  using: "composite"
-  steps:
-    - shell: bash
-      run: |
-        echo "FLUTTER_XCODE_COMPILATION_CACHE_ENABLE_CACHING=YES" >> "$GITHUB_ENV"
-        echo "FLUTTER_XCODE_SWIFT_ENABLE_COMPILE_CACHE=YES" >> "$GITHUB_ENV"
-        echo "FLUTTER_XCODE_CLANG_ENABLE_COMPILE_CACHE=YES" >> "$GITHUB_ENV"
-        echo "FLUTTER_XCODE_COMPILATION_CACHE_CAS_PATH=$HOME/xcode-cas" >> "$GITHUB_ENV"
-        mkdir -p "$HOME/xcode-cas"
-    - uses: actions/cache@v6
-      with:
-        path: ~/xcode-cas
-        key: xcode-cas-${{ inputs.xcode-version }}-${{ inputs.key-suffix }}-${{ hashFiles('sample_app/pubspec.lock', 'sample_app/ios/Podfile', 'sample_app/ios/Runner.xcodeproj/project.pbxproj') }}
-        restore-keys: xcode-cas-${{ inputs.xcode-version }}-${{ inputs.key-suffix }}-
diff --git a/.github/workflows/e2e_test.yml b/.github/workflows/e2e_test.yml
index 41e119955..a81421f7b 100644
--- a/.github/workflows/e2e_test.yml
+++ b/.github/workflows/e2e_test.yml
@@ -1,4 +1,4 @@
-name: e2e
+name: E2E Tests
 
 on:
   workflow_dispatch:
@@ -85,14 +85,8 @@ jobs:
 
       - uses: ./.github/actions/setup-ruby
 
-      - uses: ./.github/actions/cache-cocoapods
-        with:
-          key-suffix: ${{ runner.os }}
-
-      - uses: ./.github/actions/cache-xcode-cas
-        with:
-          key-suffix: ${{ runner.os }}
-          xcode-version: ${{ env.IOS_SIMULATOR_VERSION }}
+      - name: Use Firebase stubs
+        run: cp sample_app/pubspec_overrides.e2e.yaml sample_app/pubspec_overrides.yaml
 
       - name: Bootstrap
         run: |
@@ -101,6 +95,11 @@ jobs:
           flutter pub global activate melos
           melos bootstrap
 
+      # After Bootstrap so the cache keys hash the resolved pubspec.lock
+      - uses: ./.github/actions/cache-cocoapods
+        with:
+          key-suffix: ${{ runner.os }}
+
       - name: Launch Allure TestOps
         working-directory: sample_app/ios
         run: bundle exec fastlane allure_launch
diff --git a/.github/workflows/e2e_test_cron.yml b/.github/workflows/e2e_test_cron.yml
index 4ddd07b66..ad2b6e6cf 100644
--- a/.github/workflows/e2e_test_cron.yml
+++ b/.github/workflows/e2e_test_cron.yml
@@ -111,14 +111,8 @@ jobs:
           version: ${{ matrix.ios }}
           device: ${{ matrix.device }}
 
-      - uses: ./.github/actions/cache-cocoapods
-        with:
-          key-suffix: ${{ matrix.ios }}
-
-      - uses: ./.github/actions/cache-xcode-cas
-        with:
-          key-suffix: ${{ matrix.ios }}
-          xcode-version: ${{ env.XCODE_VERSION }}
+      - name: Use Firebase stubs
+        run: cp sample_app/pubspec_overrides.e2e.yaml sample_app/pubspec_overrides.yaml
 
       - name: Bootstrap
         run: |
@@ -127,6 +121,11 @@ jobs:
           flutter pub global activate melos
           melos bootstrap
 
+      # After Bootstrap so the cache keys hash the resolved pubspec.lock
+      - uses: ./.github/actions/cache-cocoapods
+        with:
+          key-suffix: ${{ matrix.ios }}
+
       - name: Launch Allure TestOps
         working-directory: sample_app/ios
         run: bundle exec fastlane allure_launch cron:true
diff --git a/sample_app/e2e_stubs/firebase_core/lib/firebase_core.dart b/sample_app/e2e_stubs/firebase_core/lib/firebase_core.dart
new file mode 100644
index 000000000..bde97276a
--- /dev/null
+++ b/sample_app/e2e_stubs/firebase_core/lib/firebase_core.dart
@@ -0,0 +1,55 @@
+/// No-op stand-in for `firebase_core`, swapped in via `pubspec_overrides.e2e.yaml`.
+///
+/// Being a pure-Dart package (no `flutter.plugin` section), it removes the Firebase
+/// pods / Gradle dependencies from e2e builds entirely: nothing is downloaded,
+/// compiled, or initialized. Only the API surface used by `sample_app` is stubbed.
+library;
+
+/// No-op replacement for the Firebase entry point.
+class Firebase {
+  /// Does nothing and returns a dummy [FirebaseApp].
+  static Future<FirebaseApp> initializeApp({String? name, FirebaseOptions? options}) async => const FirebaseApp();
+}
+
+/// Inert replacement for a configured Firebase app.
+class FirebaseApp {
+  /// Creates the inert app handle.
+  const FirebaseApp();
+}
+
+/// Plain data holder matching the real `FirebaseOptions` constructor, so the
+/// FlutterFire-generated `firebase_options.dart` compiles unchanged.
+class FirebaseOptions {
+  /// Mirrors the real constructor's signature; values are never read.
+  const FirebaseOptions({
+    required this.apiKey,
+    required this.appId,
+    required this.messagingSenderId,
+    required this.projectId,
+    this.authDomain,
+    this.databaseURL,
+    this.storageBucket,
+    this.measurementId,
+    this.trackingId,
+    this.deepLinkURLScheme,
+    this.androidClientId,
+    this.iosClientId,
+    this.iosBundleId,
+    this.appGroupId,
+  });
+
+  /// See the real `firebase_core` for field semantics; all unused here.
+  final String apiKey, appId, messagingSenderId, projectId;
+
+  /// Optional platform-specific fields accepted for constructor compatibility.
+  final String? authDomain,
+      databaseURL,
+      storageBucket,
+      measurementId,
+      trackingId,
+      deepLinkURLScheme,
+      androidClientId,
+      iosClientId,
+      iosBundleId,
+      appGroupId;
+}
diff --git a/sample_app/e2e_stubs/firebase_core/pubspec.yaml b/sample_app/e2e_stubs/firebase_core/pubspec.yaml
new file mode 100644
index 000000000..856088105
--- /dev/null
+++ b/sample_app/e2e_stubs/firebase_core/pubspec.yaml
@@ -0,0 +1,7 @@
+name: firebase_core
+description: No-op pure-Dart stand-in for firebase_core, swapped in by e2e builds to keep the native Firebase SDK out of the app.
+version: 0.0.1
+publish_to: none
+
+environment:
+  sdk: ^3.0.0
diff --git a/sample_app/e2e_stubs/firebase_crashlytics/lib/firebase_crashlytics.dart b/sample_app/e2e_stubs/firebase_crashlytics/lib/firebase_crashlytics.dart
new file mode 100644
index 000000000..b96f25a1c
--- /dev/null
+++ b/sample_app/e2e_stubs/firebase_crashlytics/lib/firebase_crashlytics.dart
@@ -0,0 +1,32 @@
+/// No-op stand-in for `firebase_crashlytics`, swapped in via `pubspec_overrides.e2e.yaml`.
+///
+/// See the `firebase_core` stub for the rationale. Only the API surface used by
+/// `sample_app` is stubbed; every call silently does nothing.
+library;
+
+import 'package:flutter/foundation.dart';
+
+/// No-op replacement for the Crashlytics reporter.
+class FirebaseCrashlytics {
+  FirebaseCrashlytics._();
+
+  /// The shared no-op instance.
+  static final FirebaseCrashlytics instance = FirebaseCrashlytics._();
+
+  /// Does nothing. The positional bool must match the real API's signature.
+  // ignore: avoid_positional_boolean_parameters
+  Future<void> setCrashlyticsCollectionEnabled(bool enabled) async {}
+
+  /// Does nothing.
+  Future<void> recordError(
+    dynamic exception,
+    StackTrace? stack, {
+    dynamic reason,
+    Iterable<Object> information = const [],
+    bool? printDetails,
+    bool fatal = false,
+  }) async {}
+
+  /// Does nothing.
+  Future<void> recordFlutterFatalError(FlutterErrorDetails flutterErrorDetails) async {}
+}
diff --git a/sample_app/e2e_stubs/firebase_crashlytics/pubspec.yaml b/sample_app/e2e_stubs/firebase_crashlytics/pubspec.yaml
new file mode 100644
index 000000000..bafb8ff01
--- /dev/null
+++ b/sample_app/e2e_stubs/firebase_crashlytics/pubspec.yaml
@@ -0,0 +1,11 @@
+name: firebase_crashlytics
+description: No-op pure-Dart stand-in for firebase_crashlytics, swapped in by e2e builds to keep the native Firebase SDK out of the app.
+version: 0.0.1
+publish_to: none
+
+environment:
+  sdk: ^3.0.0
+
+dependencies:
+  flutter:
+    sdk: flutter
diff --git a/sample_app/e2e_stubs/firebase_messaging/lib/firebase_messaging.dart b/sample_app/e2e_stubs/firebase_messaging/lib/firebase_messaging.dart
new file mode 100644
index 000000000..f38097fd6
--- /dev/null
+++ b/sample_app/e2e_stubs/firebase_messaging/lib/firebase_messaging.dart
@@ -0,0 +1,90 @@
+/// No-op stand-in for `firebase_messaging`, swapped in via `pubspec_overrides.e2e.yaml`.
+///
+/// See the `firebase_core` stub for the rationale. Only the API surface used by
+/// `sample_app` is stubbed: permission requests report denied, token getters
+/// return null, and the message streams never emit.
+library;
+
+/// Signature of the top-level FCM background handler.
+typedef BackgroundMessageHandler = Future<void> Function(RemoteMessage message);
+
+/// No-op replacement for the FCM entry point.
+class FirebaseMessaging {
+  FirebaseMessaging._();
+
+  /// The shared no-op instance.
+  static final FirebaseMessaging instance = FirebaseMessaging._();
+
+  /// Never emits.
+  static Stream<RemoteMessage> get onMessage => const Stream.empty();
+
+  /// Never emits.
+  static Stream<RemoteMessage> get onMessageOpenedApp => const Stream.empty();
+
+  /// Does nothing; [handler] is never invoked.
+  static void onBackgroundMessage(BackgroundMessageHandler handler) {}
+
+  /// Never emits.
+  Stream<String> get onTokenRefresh => const Stream.empty();
+
+  /// Always resolves to null.
+  Future<String?> getToken({String? vapidKey}) async => null;
+
+  /// Always resolves to null.
+  Future<String?> getAPNSToken() async => null;
+
+  /// Always resolves to null.
+  Future<RemoteMessage?> getInitialMessage() async => null;
+
+  /// Always reports [AuthorizationStatus.denied].
+  Future<NotificationSettings> requestPermission({
+    bool alert = true,
+    bool announcement = false,
+    bool badge = true,
+    bool carPlay = false,
+    bool criticalAlert = false,
+    bool provisional = false,
+    bool providesAppNotificationSettings = false,
+    bool sound = true,
+  }) async => const NotificationSettings(authorizationStatus: AuthorizationStatus.denied);
+
+  /// Does nothing.
+  Future<void> setForegroundNotificationPresentationOptions({
+    bool alert = false,
+    bool badge = false,
+    bool sound = false,
+  }) async {}
+}
+
+/// Mirrors the real enum values.
+enum AuthorizationStatus {
+  /// Permission granted.
+  authorized,
+
+  /// Permission denied — the stub's fixed answer.
+  denied,
+
+  /// Permission not requested yet.
+  notDetermined,
+
+  /// Provisional (quiet) permission.
+  provisional,
+}
+
+/// Minimal result type for [FirebaseMessaging.requestPermission].
+class NotificationSettings {
+  /// Creates settings with the given [authorizationStatus].
+  const NotificationSettings({required this.authorizationStatus});
+
+  /// The reported permission state.
+  final AuthorizationStatus authorizationStatus;
+}
+
+/// Minimal FCM message: only [data] is read by `sample_app`.
+class RemoteMessage {
+  /// Creates a message carrying [data].
+  const RemoteMessage({this.data = const {}});
+
+  /// The message payload.
+  final Map<String, dynamic> data;
+}
diff --git a/sample_app/e2e_stubs/firebase_messaging/pubspec.yaml b/sample_app/e2e_stubs/firebase_messaging/pubspec.yaml
new file mode 100644
index 000000000..63d1fe314
--- /dev/null
+++ b/sample_app/e2e_stubs/firebase_messaging/pubspec.yaml
@@ -0,0 +1,7 @@
+name: firebase_messaging
+description: No-op pure-Dart stand-in for firebase_messaging, swapped in by e2e builds to keep the native Firebase SDK out of the app.
+version: 0.0.1
+publish_to: none
+
+environment:
+  sdk: ^3.0.0
diff --git a/sample_app/pubspec_overrides.e2e.yaml b/sample_app/pubspec_overrides.e2e.yaml
new file mode 100644
index 000000000..9137cc18f
--- /dev/null
+++ b/sample_app/pubspec_overrides.e2e.yaml
@@ -0,0 +1,12 @@
+# Copied over pubspec_overrides.yaml by the e2e CI jobs BEFORE `melos bootstrap`
+# (melos merges its own managed overrides into the existing file, preserving these
+# entries). Swaps the Firebase plugins for the pure-Dart no-op stubs in
+# e2e_stubs/ so no native Firebase SDK is downloaded, compiled, or
+# initialized during e2e runs.
+dependency_overrides:
+  firebase_core:
+    path: e2e_stubs/firebase_core
+  firebase_crashlytics:
+    path: e2e_stubs/firebase_crashlytics
+  firebase_messaging:
+    path: e2e_stubs/firebase_messaging