diff --git a/.github/workflows/test-all.yml b/.github/workflows/test-all.yml
index b908d0f0061a..7269264395ea 100644
--- a/.github/workflows/test-all.yml
+++ b/.github/workflows/test-all.yml
@@ -203,6 +203,40 @@ jobs:
       fail-on-error: true
     secrets: inherit
 
+  test_ios_spm_rntester:
+    needs:
+      [
+        prebuild_apple_dependencies,
+        prebuild_react_native_core,
+        check_code_changes,
+      ]
+    if: ${{ needs.prebuild_react_native_core.result == 'success' && needs.check_code_changes.outputs.should_test_ios == 'true' }}
+    uses: ./.github/workflows/test-ios-spm-rntester.yml
+    secrets: inherit
+
+  test_ios_spm_helloworld:
+    needs:
+      [
+        prebuild_apple_dependencies,
+        prebuild_react_native_core,
+        check_code_changes,
+      ]
+    if: ${{ needs.prebuild_react_native_core.result == 'success' && needs.check_code_changes.outputs.should_test_ios == 'true' }}
+    uses: ./.github/workflows/test-ios-spm-helloworld.yml
+    secrets: inherit
+
+  test_ios_spm_newapp:
+    needs:
+      [
+        build_npm_package,
+        prebuild_apple_dependencies,
+        prebuild_react_native_core,
+        check_code_changes,
+      ]
+    if: ${{ needs.prebuild_react_native_core.result == 'success' && needs.build_npm_package.result == 'success' && needs.check_code_changes.outputs.should_test_ios == 'true' }}
+    uses: ./.github/workflows/test-ios-spm-newapp.yml
+    secrets: inherit
+
   test_e2e_android_templateapp:
     needs: [build_npm_package, build_android]
     if: ${{ always() && needs.build_android.result == 'success' && needs.build_npm_package.result == 'success' }}
diff --git a/.github/workflows/test-ios-spm-helloworld.yml b/.github/workflows/test-ios-spm-helloworld.yml
new file mode 100644
index 000000000000..6dcad4a07fdb
--- /dev/null
+++ b/.github/workflows/test-ios-spm-helloworld.yml
@@ -0,0 +1,151 @@
+name: Test iOS SwiftPM - Hello World
+
+permissions:
+  contents: read
+
+on:
+  workflow_call:
+
+jobs:
+  test:
+    runs-on: macos-15-large
+    # TODO: remove once this new lane has proven green on main. Keeps a
+    # brand-new SwiftPM build from hard-blocking unrelated iOS PRs.
+    continue-on-error: true
+    strategy:
+      fail-fast: false
+      matrix:
+        flavor: [Debug, Release]
+    env:
+      APP_IOS_DIR: private/helloworld/ios
+      XCODE_PROJECT: HelloWorld.xcodeproj
+      XCODE_SCHEME: HelloWorld
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+      - name: Setup xcode
+        uses: ./.github/actions/setup-xcode
+      - name: Setup node.js
+        uses: ./.github/actions/setup-node
+      - name: Run yarn install
+        uses: ./.github/actions/yarn-install
+      - name: Set Hermes prebuilt version
+        shell: bash
+        run: node ./scripts/releases/use-hermes-prebuilt.js
+      - name: Run yarn install again, with the correct hermes version
+        uses: ./.github/actions/yarn-install
+      - name: Ensure CocoaPods (`spm add --deintegrate` shells out to `pod`)
+        shell: bash
+        run: pod --version || sudo gem install cocoapods --no-document
+      # Both flavors are needed by every matrix cell, not just the one it builds:
+      # `spm add` stages both flavor framework trees and lets a per-configuration
+      # build setting pick one at build time, so it validates the debug/ and
+      # release/ artifact slots together (and `--download skip` refuses an
+      # incomplete slot). Please don't "optimise" this down to one flavor.
+      - name: Download ReactCore (Debug)
+        uses: actions/download-artifact@v7
+        with:
+          name: ReactCoreDebug.xcframework.tar.gz
+          path: /tmp/rc-debug
+      - name: Download ReactCore (Release)
+        uses: actions/download-artifact@v7
+        with:
+          name: ReactCoreRelease.xcframework.tar.gz
+          path: /tmp/rc-release
+      - name: Download ReactNativeDependencies (Debug)
+        uses: actions/download-artifact@v7
+        with:
+          name: ReactNativeDependenciesDebug.xcframework.tar.gz
+          path: /tmp/deps-debug
+      - name: Download ReactNativeDependencies (Release)
+        uses: actions/download-artifact@v7
+        with:
+          name: ReactNativeDependenciesRelease.xcframework.tar.gz
+          path: /tmp/deps-release
+      # `spm download` primes both flavor slots per call and skips any slot that
+      # already validates, so prime in two passes: the first fills both slots
+      # with the Release bits, then debug/ is dropped and re-primed from the
+      # Debug tarballs while release/ validates and is left alone. hermes-engine
+      # is fetched from Maven by the command itself.
+      - name: Prime SwiftPM artifacts (Debug + Release)
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: |
+          RN_CORE_TARBALL_PATH=/tmp/rc-release/ReactCoreRelease.xcframework.tar.gz \
+          RN_DEPS_TARBALL_PATH=/tmp/deps-release/ReactNativeDependenciesRelease.xcframework.tar.gz \
+            npx react-native spm download --artifacts /tmp/spm-artifacts
+          rm -rf /tmp/spm-artifacts/debug
+          RN_CORE_TARBALL_PATH=/tmp/rc-debug/ReactCoreDebug.xcframework.tar.gz \
+          RN_DEPS_TARBALL_PATH=/tmp/deps-debug/ReactNativeDependenciesDebug.xcframework.tar.gz \
+            npx react-native spm download --artifacts /tmp/spm-artifacts
+      - name: Scaffold Package.swift manifests for community dependencies
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: npx react-native spm scaffold || true
+      - name: Convert the app to SwiftPM
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: npx react-native spm add --deintegrate --artifacts /tmp/spm-artifacts --download skip
+      - name: Assert the app is on SwiftPM
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: |
+          if [[ ! -f "$XCODE_PROJECT/.spm-injected.json" ]]; then
+            echo "::error::spm add did not inject SwiftPM: $XCODE_PROJECT/.spm-injected.json is missing"
+            exit 1
+          fi
+          if [[ -f Podfile ]] && grep -q 'use_react_native!' Podfile; then
+            echo "::error::spm add --deintegrate left use_react_native! in the Podfile"
+            exit 1
+          fi
+          echo "SwiftPM injected in place; Podfile de-integrated."
+      # Under SwiftPM there is no hermes-engine pod to set HERMES_CLI_PATH, so
+      # resolve hermesc from the app's node_modules for react-native-xcode.sh.
+      - name: Resolve HERMES_CLI_PATH
+        if: ${{ matrix.flavor == 'Release' }}
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: |
+          HERMESC=$(node -e "const p=require('path');console.log(p.join(p.dirname(require.resolve('hermes-compiler/package.json')),'hermesc/osx-bin/hermesc'))" 2>/dev/null || true)
+          if [[ -z "$HERMESC" || ! -x "$HERMESC" ]]; then
+            echo "::error::Could not resolve hermes-compiler's hermesc from $PWD. Release builds need it to compile JS to Hermes bytecode; failing here so it is not mistaken for an xcodebuild bundling error."
+            exit 1
+          fi
+          echo "HERMES_CLI_PATH=$HERMESC" >> "$GITHUB_ENV"
+          echo "Using hermesc at $HERMESC"
+      - name: Build ${{ env.XCODE_SCHEME }} (${{ matrix.flavor }})
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: |
+          xcodebuild \
+            -project "$XCODE_PROJECT" \
+            -scheme "$XCODE_SCHEME" \
+            -configuration "${{ matrix.flavor }}" \
+            -sdk iphonesimulator \
+            -destination 'generic/platform=iOS Simulator' \
+            -derivedDataPath build/spm-e2e-dd \
+            build
+      - name: Check the embedded React.framework flavor
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: |
+          PRODUCTS="build/spm-e2e-dd/Build/Products/${{ matrix.flavor }}-iphonesimulator"
+          if [[ ! -d "$PRODUCTS" ]]; then
+            echo "Skipping flavor check: no build products directory."
+            exit 0
+          fi
+          BINARY=$(find "$PRODUCTS" -maxdepth 4 -path '*.app/Frameworks/React.framework/React' -type f 2>/dev/null | head -1 || true)
+          if [[ -z "$BINARY" ]] || ! command -v nm >/dev/null; then
+            echo "Skipping flavor check: no embedded React.framework binary or no nm."
+            exit 0
+          fi
+          COUNT=$(nm "$BINARY" | grep -c getDebugProps || true)
+          echo "getDebugProps symbols in $BINARY: $COUNT"
+          if [[ "${{ matrix.flavor }}" == 'Debug' && "$COUNT" -eq 0 ]]; then
+            echo "::error::Debug build embeds a Release React.framework (expected getDebugProps symbols, found none)"
+            exit 1
+          fi
+          if [[ "${{ matrix.flavor }}" == 'Release' && "$COUNT" -ne 0 ]]; then
+            echo "::error::Release build embeds a Debug React.framework ($COUNT getDebugProps symbols, expected none)"
+            exit 1
+          fi
diff --git a/.github/workflows/test-ios-spm-newapp.yml b/.github/workflows/test-ios-spm-newapp.yml
new file mode 100644
index 000000000000..960177f659c6
--- /dev/null
+++ b/.github/workflows/test-ios-spm-newapp.yml
@@ -0,0 +1,162 @@
+name: Test iOS SwiftPM - New App
+
+permissions:
+  contents: read
+
+on:
+  workflow_call:
+
+jobs:
+  test:
+    runs-on: macos-15-large
+    # TODO: remove once this new lane has proven green on main. Keeps a
+    # brand-new SwiftPM build from hard-blocking unrelated iOS PRs.
+    continue-on-error: true
+    strategy:
+      fail-fast: false
+      matrix:
+        flavor: [Debug, Release]
+    env:
+      APP_IOS_DIR: private/helloworld/ios
+      XCODE_PROJECT: HelloWorld.xcodeproj
+      XCODE_SCHEME: HelloWorld
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+      - name: Setup xcode
+        uses: ./.github/actions/setup-xcode
+      - name: Setup node.js
+        uses: ./.github/actions/setup-node
+      - name: Run yarn install
+        uses: ./.github/actions/yarn-install
+      - name: Set Hermes prebuilt version
+        shell: bash
+        run: node ./scripts/releases/use-hermes-prebuilt.js
+      - name: Run yarn install again, with the correct hermes version
+        uses: ./.github/actions/yarn-install
+      - name: Ensure CocoaPods (`spm add --deintegrate` shells out to `pod`)
+        shell: bash
+        run: pod --version || sudo gem install cocoapods --no-document
+      # Both flavors are needed by every matrix cell, not just the one it builds:
+      # `spm add` stages both flavor framework trees and lets a per-configuration
+      # build setting pick one at build time, so it validates the debug/ and
+      # release/ artifact slots together (and `--download skip` refuses an
+      # incomplete slot). Please don't "optimise" this down to one flavor.
+      - name: Download ReactCore (Debug)
+        uses: actions/download-artifact@v7
+        with:
+          name: ReactCoreDebug.xcframework.tar.gz
+          path: /tmp/rc-debug
+      - name: Download ReactCore (Release)
+        uses: actions/download-artifact@v7
+        with:
+          name: ReactCoreRelease.xcframework.tar.gz
+          path: /tmp/rc-release
+      - name: Download ReactNativeDependencies (Debug)
+        uses: actions/download-artifact@v7
+        with:
+          name: ReactNativeDependenciesDebug.xcframework.tar.gz
+          path: /tmp/deps-debug
+      - name: Download ReactNativeDependencies (Release)
+        uses: actions/download-artifact@v7
+        with:
+          name: ReactNativeDependenciesRelease.xcframework.tar.gz
+          path: /tmp/deps-release
+      - name: Download React Native package
+        uses: actions/download-artifact@v7
+        with:
+          name: react-native-package
+          path: /tmp/react-native-tmp
+      # Reinstalls private/helloworld in place against the packaged react-native
+      # (published through the local proxy), so the app under test is what a user
+      # would get from npm rather than the workspace source.
+      - name: Prepare the HelloWorld application
+        shell: bash
+        run: node ./scripts/e2e/init-project-e2e.js --useHelloWorld --pathToLocalReactNative "/tmp/react-native-tmp/$(cat /tmp/react-native-tmp/react-native-package-version)"
+      # `spm download` primes both flavor slots per call and skips any slot that
+      # already validates, so prime in two passes: the first fills both slots
+      # with the Release bits, then debug/ is dropped and re-primed from the
+      # Debug tarballs while release/ validates and is left alone. hermes-engine
+      # is fetched from Maven by the command itself.
+      - name: Prime SwiftPM artifacts (Debug + Release)
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: |
+          RN_CORE_TARBALL_PATH=/tmp/rc-release/ReactCoreRelease.xcframework.tar.gz \
+          RN_DEPS_TARBALL_PATH=/tmp/deps-release/ReactNativeDependenciesRelease.xcframework.tar.gz \
+            npx react-native spm download --artifacts /tmp/spm-artifacts
+          rm -rf /tmp/spm-artifacts/debug
+          RN_CORE_TARBALL_PATH=/tmp/rc-debug/ReactCoreDebug.xcframework.tar.gz \
+          RN_DEPS_TARBALL_PATH=/tmp/deps-debug/ReactNativeDependenciesDebug.xcframework.tar.gz \
+            npx react-native spm download --artifacts /tmp/spm-artifacts
+      - name: Scaffold Package.swift manifests for community dependencies
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: npx react-native spm scaffold || true
+      - name: Convert the app to SwiftPM
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: npx react-native spm add --deintegrate --artifacts /tmp/spm-artifacts --download skip
+      - name: Assert the app is on SwiftPM
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: |
+          if [[ ! -f "$XCODE_PROJECT/.spm-injected.json" ]]; then
+            echo "::error::spm add did not inject SwiftPM: $XCODE_PROJECT/.spm-injected.json is missing"
+            exit 1
+          fi
+          if [[ -f Podfile ]] && grep -q 'use_react_native!' Podfile; then
+            echo "::error::spm add --deintegrate left use_react_native! in the Podfile"
+            exit 1
+          fi
+          echo "SwiftPM injected in place; Podfile de-integrated."
+      # Under SwiftPM there is no hermes-engine pod to set HERMES_CLI_PATH, so
+      # resolve hermesc from the app's node_modules for react-native-xcode.sh.
+      - name: Resolve HERMES_CLI_PATH
+        if: ${{ matrix.flavor == 'Release' }}
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: |
+          HERMESC=$(node -e "const p=require('path');console.log(p.join(p.dirname(require.resolve('hermes-compiler/package.json')),'hermesc/osx-bin/hermesc'))" 2>/dev/null || true)
+          if [[ -z "$HERMESC" || ! -x "$HERMESC" ]]; then
+            echo "::error::Could not resolve hermes-compiler's hermesc from $PWD. Release builds need it to compile JS to Hermes bytecode; failing here so it is not mistaken for an xcodebuild bundling error."
+            exit 1
+          fi
+          echo "HERMES_CLI_PATH=$HERMESC" >> "$GITHUB_ENV"
+          echo "Using hermesc at $HERMESC"
+      - name: Build ${{ env.XCODE_SCHEME }} (${{ matrix.flavor }})
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: |
+          xcodebuild \
+            -project "$XCODE_PROJECT" \
+            -scheme "$XCODE_SCHEME" \
+            -configuration "${{ matrix.flavor }}" \
+            -sdk iphonesimulator \
+            -destination 'generic/platform=iOS Simulator' \
+            -derivedDataPath build/spm-e2e-dd \
+            build
+      - name: Check the embedded React.framework flavor
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: |
+          PRODUCTS="build/spm-e2e-dd/Build/Products/${{ matrix.flavor }}-iphonesimulator"
+          if [[ ! -d "$PRODUCTS" ]]; then
+            echo "Skipping flavor check: no build products directory."
+            exit 0
+          fi
+          BINARY=$(find "$PRODUCTS" -maxdepth 4 -path '*.app/Frameworks/React.framework/React' -type f 2>/dev/null | head -1 || true)
+          if [[ -z "$BINARY" ]] || ! command -v nm >/dev/null; then
+            echo "Skipping flavor check: no embedded React.framework binary or no nm."
+            exit 0
+          fi
+          COUNT=$(nm "$BINARY" | grep -c getDebugProps || true)
+          echo "getDebugProps symbols in $BINARY: $COUNT"
+          if [[ "${{ matrix.flavor }}" == 'Debug' && "$COUNT" -eq 0 ]]; then
+            echo "::error::Debug build embeds a Release React.framework (expected getDebugProps symbols, found none)"
+            exit 1
+          fi
+          if [[ "${{ matrix.flavor }}" == 'Release' && "$COUNT" -ne 0 ]]; then
+            echo "::error::Release build embeds a Debug React.framework ($COUNT getDebugProps symbols, expected none)"
+            exit 1
+          fi
diff --git a/.github/workflows/test-ios-spm-rntester.yml b/.github/workflows/test-ios-spm-rntester.yml
new file mode 100644
index 000000000000..7d56883de7af
--- /dev/null
+++ b/.github/workflows/test-ios-spm-rntester.yml
@@ -0,0 +1,151 @@
+name: Test iOS SwiftPM - RN Tester
+
+permissions:
+  contents: read
+
+on:
+  workflow_call:
+
+jobs:
+  test:
+    runs-on: macos-15-large
+    # TODO: remove once this new lane has proven green on main. Keeps a
+    # brand-new SwiftPM build from hard-blocking unrelated iOS PRs.
+    continue-on-error: true
+    strategy:
+      fail-fast: false
+      matrix:
+        flavor: [Debug, Release]
+    env:
+      APP_IOS_DIR: packages/rn-tester
+      XCODE_PROJECT: RNTesterPods.xcodeproj
+      XCODE_SCHEME: RNTester
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+      - name: Setup xcode
+        uses: ./.github/actions/setup-xcode
+      - name: Setup node.js
+        uses: ./.github/actions/setup-node
+      - name: Run yarn install
+        uses: ./.github/actions/yarn-install
+      - name: Set Hermes prebuilt version
+        shell: bash
+        run: node ./scripts/releases/use-hermes-prebuilt.js
+      - name: Run yarn install again, with the correct hermes version
+        uses: ./.github/actions/yarn-install
+      - name: Ensure CocoaPods (`spm add --deintegrate` shells out to `pod`)
+        shell: bash
+        run: pod --version || sudo gem install cocoapods --no-document
+      # Both flavors are needed by every matrix cell, not just the one it builds:
+      # `spm add` stages both flavor framework trees and lets a per-configuration
+      # build setting pick one at build time, so it validates the debug/ and
+      # release/ artifact slots together (and `--download skip` refuses an
+      # incomplete slot). Please don't "optimise" this down to one flavor.
+      - name: Download ReactCore (Debug)
+        uses: actions/download-artifact@v7
+        with:
+          name: ReactCoreDebug.xcframework.tar.gz
+          path: /tmp/rc-debug
+      - name: Download ReactCore (Release)
+        uses: actions/download-artifact@v7
+        with:
+          name: ReactCoreRelease.xcframework.tar.gz
+          path: /tmp/rc-release
+      - name: Download ReactNativeDependencies (Debug)
+        uses: actions/download-artifact@v7
+        with:
+          name: ReactNativeDependenciesDebug.xcframework.tar.gz
+          path: /tmp/deps-debug
+      - name: Download ReactNativeDependencies (Release)
+        uses: actions/download-artifact@v7
+        with:
+          name: ReactNativeDependenciesRelease.xcframework.tar.gz
+          path: /tmp/deps-release
+      # `spm download` primes both flavor slots per call and skips any slot that
+      # already validates, so prime in two passes: the first fills both slots
+      # with the Release bits, then debug/ is dropped and re-primed from the
+      # Debug tarballs while release/ validates and is left alone. hermes-engine
+      # is fetched from Maven by the command itself.
+      - name: Prime SwiftPM artifacts (Debug + Release)
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: |
+          RN_CORE_TARBALL_PATH=/tmp/rc-release/ReactCoreRelease.xcframework.tar.gz \
+          RN_DEPS_TARBALL_PATH=/tmp/deps-release/ReactNativeDependenciesRelease.xcframework.tar.gz \
+            npx react-native spm download --artifacts /tmp/spm-artifacts
+          rm -rf /tmp/spm-artifacts/debug
+          RN_CORE_TARBALL_PATH=/tmp/rc-debug/ReactCoreDebug.xcframework.tar.gz \
+          RN_DEPS_TARBALL_PATH=/tmp/deps-debug/ReactNativeDependenciesDebug.xcframework.tar.gz \
+            npx react-native spm download --artifacts /tmp/spm-artifacts
+      - name: Scaffold Package.swift manifests for community dependencies
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: npx react-native spm scaffold || true
+      - name: Convert the app to SwiftPM
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: npx react-native spm add --deintegrate --artifacts /tmp/spm-artifacts --download skip
+      - name: Assert the app is on SwiftPM
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: |
+          if [[ ! -f "$XCODE_PROJECT/.spm-injected.json" ]]; then
+            echo "::error::spm add did not inject SwiftPM: $XCODE_PROJECT/.spm-injected.json is missing"
+            exit 1
+          fi
+          if [[ -f Podfile ]] && grep -q 'use_react_native!' Podfile; then
+            echo "::error::spm add --deintegrate left use_react_native! in the Podfile"
+            exit 1
+          fi
+          echo "SwiftPM injected in place; Podfile de-integrated."
+      # Under SwiftPM there is no hermes-engine pod to set HERMES_CLI_PATH, so
+      # resolve hermesc from the app's node_modules for react-native-xcode.sh.
+      - name: Resolve HERMES_CLI_PATH
+        if: ${{ matrix.flavor == 'Release' }}
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: |
+          HERMESC=$(node -e "const p=require('path');console.log(p.join(p.dirname(require.resolve('hermes-compiler/package.json')),'hermesc/osx-bin/hermesc'))" 2>/dev/null || true)
+          if [[ -z "$HERMESC" || ! -x "$HERMESC" ]]; then
+            echo "::error::Could not resolve hermes-compiler's hermesc from $PWD. Release builds need it to compile JS to Hermes bytecode; failing here so it is not mistaken for an xcodebuild bundling error."
+            exit 1
+          fi
+          echo "HERMES_CLI_PATH=$HERMESC" >> "$GITHUB_ENV"
+          echo "Using hermesc at $HERMESC"
+      - name: Build ${{ env.XCODE_SCHEME }} (${{ matrix.flavor }})
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: |
+          xcodebuild \
+            -project "$XCODE_PROJECT" \
+            -scheme "$XCODE_SCHEME" \
+            -configuration "${{ matrix.flavor }}" \
+            -sdk iphonesimulator \
+            -destination 'generic/platform=iOS Simulator' \
+            -derivedDataPath build/spm-e2e-dd \
+            build
+      - name: Check the embedded React.framework flavor
+        shell: bash
+        working-directory: ${{ env.APP_IOS_DIR }}
+        run: |
+          PRODUCTS="build/spm-e2e-dd/Build/Products/${{ matrix.flavor }}-iphonesimulator"
+          if [[ ! -d "$PRODUCTS" ]]; then
+            echo "Skipping flavor check: no build products directory."
+            exit 0
+          fi
+          BINARY=$(find "$PRODUCTS" -maxdepth 4 -path '*.app/Frameworks/React.framework/React' -type f 2>/dev/null | head -1 || true)
+          if [[ -z "$BINARY" ]] || ! command -v nm >/dev/null; then
+            echo "Skipping flavor check: no embedded React.framework binary or no nm."
+            exit 0
+          fi
+          COUNT=$(nm "$BINARY" | grep -c getDebugProps || true)
+          echo "getDebugProps symbols in $BINARY: $COUNT"
+          if [[ "${{ matrix.flavor }}" == 'Debug' && "$COUNT" -eq 0 ]]; then
+            echo "::error::Debug build embeds a Release React.framework (expected getDebugProps symbols, found none)"
+            exit 1
+          fi
+          if [[ "${{ matrix.flavor }}" == 'Release' && "$COUNT" -ne 0 ]]; then
+            echo "::error::Release build embeds a Debug React.framework ($COUNT getDebugProps symbols, expected none)"
+            exit 1
+          fi