fix: macos-15

.github/workflows/e2e-ios.yml

@@ -11,7 +11,7 @@ concurrency:
 
 jobs:
   build:
-    runs-on: macos-26
+    runs-on: macos-15
     env:
       BUILD_CONFIGURATION: Release
       CCACHE_MAXSIZE: "2G"
@@ -21,6 +21,11 @@ jobs:
       - name: Checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
+      # Default Xcode on macos-15 is 16.4 (iOS 18 SDK). Pin Xcode 26.0.1 so we can
+      # build against iOS 26 SDK and run on the iPhone 17 / iOS 26.x simulator.
+      - name: Select Xcode 26.0.1
+        run: sudo xcode-select -s /Applications/Xcode_26.0.1.app/Contents/Developer
+
       - name: Setup Node.js
         uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
         with:
@@ -160,7 +165,7 @@ jobs:
           if-no-files-found: error
 
   test:
-    runs-on: macos-26
+    runs-on: macos-15
     needs: build
     env:
       HD_MNEMONIC: ${{ secrets.HD_MNEMONIC }}
@@ -170,6 +175,11 @@ jobs:
       - name: Checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
+      # Default Xcode on macos-15 is 16.4 (iOS 18 SDK). Pin Xcode 26.0.1 so we can
+      # build against iOS 26 SDK and run on the iPhone 17 / iOS 26.x simulator.
+      - name: Select Xcode 26.0.1
+        run: sudo xcode-select -s /Applications/Xcode_26.0.1.app/Contents/Developer
+
       - name: Setup Node.js
         uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
         with: