CI: stress test legacy iOS harness (20 iterations)

.github/workflows/stress-test-legacy.yml

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+name: Stress test legacy iOS harness
+on:
+  pull_request:
+
+jobs:
+  stress-test-ios-legacy:
+    runs-on: macos-latest
+    timeout-minutes: 120
+    env:
+      XCODE_VERSION: 16.4
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup
+        uses: ./.github/actions/setup
+
+      - name: Use appropriate Xcode version
+        uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: ${{ env.XCODE_VERSION }}
+
+      - name: Restore cocoapods
+        id: cocoapods-cache
+        uses: actions/cache/restore@v4
+        with:
+          path: |
+            **/ios/Pods
+          key: ${{ runner.os }}-legacy-cocoapods-${{ hashFiles('example/ios/Podfile', '*.podspec') }}
+          restore-keys: |
+            ${{ runner.os }}-legacy-cocoapods-
+
+      - name: Install cocoapods
+        if: steps.cocoapods-cache.outputs.cache-hit != 'true'
+        run: |
+          cd example
+          bundle install
+          USE_RIVE_LEGACY=1 bundle exec pod install --project-directory=ios
+
+      - name: Save cocoapods cache
+        if: steps.cocoapods-cache.outputs.cache-hit != 'true'
+        uses: actions/cache/save@v4
+        with:
+          path: |
+            **/ios/Pods
+          key: ${{ steps.cocoapods-cache.outputs.cache-key }}
+
+      - name: Restore iOS build cache
+        id: ios-build-cache
+        uses: actions/cache/restore@v4
+        with:
+          path: example/ios/build
+          key: ${{ runner.os }}-ios-legacy-build-${{ env.XCODE_VERSION }}-${{ hashFiles('yarn.lock', 'ios/**', 'nitrogen/generated/ios/**', '*.podspec', 'example/ios/Podfile', 'example/ios/RiveExample/**') }}
+          restore-keys: |
+            ${{ runner.os }}-ios-legacy-build-${{ env.XCODE_VERSION }}-
+
+      - name: Build iOS app
+        if: steps.ios-build-cache.outputs.cache-hit != 'true'
+        working-directory: example/ios
+        run: |
+          set -o pipefail && xcodebuild \
+            -derivedDataPath build \
+            -workspace RiveExample.xcworkspace \
+            -scheme RiveExample \
+            -sdk iphonesimulator \
+            -configuration Debug \
+            build \
+            CODE_SIGNING_ALLOWED=NO
+
+      - name: Save iOS build cache
+        if: steps.ios-build-cache.outputs.cache-hit != 'true'
+        uses: actions/cache/save@v4
+        with:
+          path: example/ios/build
+          key: ${{ steps.ios-build-cache.outputs.cache-primary-key }}
+
+      - name: Boot iOS Simulator
+        uses: futureware-tech/simulator-action@v4
+        with:
+          model: 'iPhone 16 Pro'
+          os_version: '18.6'
+
+      - name: Install app on simulator
+        run: xcrun simctl install booted example/ios/build/Build/Products/Debug-iphonesimulator/RiveExample.app
+
+      - name: Wait for simulator to be fully ready
+        run: |
+          echo "Waiting for simulator to be fully ready..."
+          sleep 15
+          xcrun simctl list devices | grep Booted
+
+      - name: Stress test - run 20 iterations
+        working-directory: example
+        run: |
+          failures=0
+          for i in $(seq 1 20); do
+            echo "=== Iteration $i ==="
+            if yarn test:harness:ios --verbose --testTimeout 120000 2>&1 | tee /tmp/run-$i.log | tail -5; then
+              echo "Run $i: PASS"
+            else
+              failures=$((failures+1))
+              echo "Run $i: FAIL"
+              echo "--- Failed test details ---"
+              grep -E "FAIL|did not respond|Error" /tmp/run-$i.log | head -10
+            fi
+            echo ""
+          done
+          echo "=== RESULTS: $failures failures out of 20 ==="
+          if [ $failures -gt 0 ]; then
+            echo "::warning::$failures out of 20 runs failed"
+          fi
+
+      - name: Collect simulator logs on failure
+        if: failure()
+        run: |
+          echo "=== Last 10 minutes of simulator logs ==="
+          xcrun simctl spawn booted log show --predicate 'processImagePath CONTAINS "RiveExample"' --last 10m --style compact 2>&1 | tail -500 || echo "No logs found"