diff --git a/.circleci/config.yml b/.circleci/config.yml
index 406c5dc6e30cc..94ed65e6e8986 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,3 +1,4 @@
+asdf-invalid
 version: 2.1
 
 orbs:
diff --git a/.github/actions/install-chrome/action.yml b/.github/actions/install-chrome/action.yml
new file mode 100644
index 0000000000000..4fdcb796deecd
--- /dev/null
+++ b/.github/actions/install-chrome/action.yml
@@ -0,0 +1,20 @@
+name: 'Install Chrome'
+description: 'Installs Google Chrome'
+runs:
+  using: "composite"
+  steps:
+    - name: Download and install Chrome
+      run: |
+        if [ -f /usr/bin/google-chrome ]; then
+          echo "Google Chrome is already installed:"
+          /usr/bin/google-chrome --version
+        else
+          sudo apt-get update
+          sudo apt-get install -q -y libu2f-udev libvulkan1 xdg-utils
+          wget -O ~/chrome.deb https://dl.google.com/linux/direct/google-chrome-beta_current_amd64.deb
+          sudo dpkg -i ~/chrome.deb
+          echo "Chrome version:"
+          /usr/bin/google-chrome --version
+        fi
+      shell: bash
+
diff --git a/.github/actions/install-node-newest/action.yml b/.github/actions/install-node-newest/action.yml
new file mode 100644
index 0000000000000..ab8a344d5b32b
--- /dev/null
+++ b/.github/actions/install-node-newest/action.yml
@@ -0,0 +1,16 @@
+name: 'Install Node Newest'
+description: 'Installs Node v25.4.0'
+runs:
+  using: "composite"
+  steps:
+    - name: Download Node
+      run: |
+        cd $HOME
+        wget https://nodejs.org/dist/v25.4.0/node-v25.4.0-linux-x64.tar.xz
+        tar xf node-v25.4.0-linux-x64.tar.xz
+        echo "NODE_JS_TEST = [os.path.expanduser('~/node-v25.4.0-linux-x64/bin/node')]" >> $EMSDK/.emscripten
+        echo "JS_ENGINES = [NODE_JS_TEST]" >> $EMSDK/.emscripten
+        echo "if os.path.exists(V8_ENGINE[0]): JS_ENGINES.append(V8_ENGINE)" >> $EMSDK/.emscripten
+        cat $EMSDK/.emscripten
+        echo "/home/runner/node-v25.4.0-linux-x64/bin" >> $GITHUB_PATH
+      shell: bash
diff --git a/.github/actions/install-node/#action.yml# b/.github/actions/install-node/#action.yml#
new file mode 100644
index 0000000000000..4ba0474323aa3
--- /dev/null
+++ b/.github/actions/install-node/#action.yml#
@@ -0,0 +1,29 @@
+name: 'Install Node'
+description: 'Downloads and installs a specified version of Node.js'
+inputs:
+  node_version:
+    description: 'Node version to install'
+    required: true
+    default: '25.4.0'
+
+runs:
+  using: "composite"
+  steps:
+    - name: Download and Configure Node
+      run: |
+        cd $HOME
+        case "${{ inputs.node_version }}" in
+          newest) version="25.4.0" ;;
+          lts) version="22.21.0" ;;
+          # Keep this in sync with `OLDEST_SUPPORTED_NODE` in `feature_matrix.py`
+          oldest) version="18.3.0" ;;
+          *) version="${{ inputs.node_version }}" ;;
+        esac
+        wget https://nodejs.org/dist/v${version}/node-v${version}-linux-x64.tar.xz
+        tar xf node-v${version}-linux-x64.tar.xz
+        echo "NODE_JS_TEST = [os.path.expanduser('~/node-v${version}-linux-x64/bin/node')]" >> $EMSDK/.emscripten
+        echo "JS_ENGINES = [NODE_JS_TEST]" >> $EMSDK/.emscripten
+        echo "if os.path.exists(V8_ENGINE[0]): JS_ENGINES.append(V8_ENGINE)" >> $EMSDK/.emscripten
+        cat $EMSDK/.emscripten
+        echo "/home/runner/node-v${version}-linux-x64/bin" >> $GITHUB_PATH
+      shell: bash
diff --git a/.github/actions/install-node/.#action.yml b/.github/actions/install-node/.#action.yml
new file mode 120000
index 0000000000000..25dfa1c8ee874
--- /dev/null
+++ b/.github/actions/install-node/.#action.yml
@@ -0,0 +1 @@
+dschuff@mirasol.c.googlers.com.2270904:1775861650
\ No newline at end of file
diff --git a/.github/actions/install-node/action.yml b/.github/actions/install-node/action.yml
new file mode 100644
index 0000000000000..f1a9e3d8a721f
--- /dev/null
+++ b/.github/actions/install-node/action.yml
@@ -0,0 +1,28 @@
+name: 'Install Node'
+description: 'Downloads and installs a specified version of Node.js'
+inputs:
+  node_version:
+    description: 'Node version to install'
+    required: true
+    default: '25.4.0'
+
+runs:
+  using: "composite"
+  steps:
+    - name: Download and Configure Node
+      run: |
+        cd $HOME
+        case "${{ inputs.node_version }}" in
+          newest) version="25.4.0" ;;
+          lts) version="22.21.0" ;;
+          oldest) version="18.3.0" ;;
+          *) version="${{ inputs.node_version }}" ;;
+        esac
+        wget https://nodejs.org/dist/v${version}/node-v${version}-linux-x64.tar.xz
+        tar xf node-v${version}-linux-x64.tar.xz
+        echo "NODE_JS_TEST = [os.path.expanduser('~/node-v${version}-linux-x64/bin/node')]" >> $EMSDK/.emscripten
+        echo "JS_ENGINES = [NODE_JS_TEST]" >> $EMSDK/.emscripten
+        echo "if os.path.exists(V8_ENGINE[0]): JS_ENGINES.append(V8_ENGINE)" >> $EMSDK/.emscripten
+        cat $EMSDK/.emscripten
+        echo "/home/runner/node-v${version}-linux-x64/bin" >> $GITHUB_PATH
+      shell: bash
diff --git a/.github/actions/install-v8/action.yml b/.github/actions/install-v8/action.yml
new file mode 100644
index 0000000000000..f17c85a774080
--- /dev/null
+++ b/.github/actions/install-v8/action.yml
@@ -0,0 +1,14 @@
+name: 'Install V8'
+description: 'Installs V8 via jsvu'
+runs:
+  using: "composite"
+  steps:
+    - name: Get V8
+      run: |
+        cd $HOME
+        wget https://nodejs.org/dist/v15.14.0/node-v15.14.0-linux-x64.tar.xz
+        tar -xf node-v15.14.0-linux-x64.tar.xz
+        export PATH="`pwd`/node-v15.14.0-linux-x64/bin:${PATH}"
+        npm install jsvu -g
+        jsvu --os=default --engines=v8
+      shell: bash
diff --git a/.github/actions/prepare-for-tests/action.yml b/.github/actions/prepare-for-tests/action.yml
new file mode 100644
index 0000000000000..2790bd26ab118
--- /dev/null
+++ b/.github/actions/prepare-for-tests/action.yml
@@ -0,0 +1,50 @@
+name: 'Prepare for Tests'
+description: 'Prepares the environment for running Emscripten tests'
+runs:
+  using: "composite"
+  steps:
+    - name: Install Emsdk
+      uses: emscripten-core/setup-emsdk@v16
+      with:
+        version: tot
+
+    - name: Attach workspace
+      uses: actions/download-artifact@v4
+      with:
+        name: emscripten-cache
+        path: ~/
+
+    - name: Extract persistent directories
+      run: tar -xzf ~/emscripten-cache.tar.gz -C ~/
+      shell: bash
+
+    - name: Set EM_CONFIG
+      run: echo "EM_CONFIG=$EMSDK/.emscripten" >> $GITHUB_ENV
+      shell: bash
+
+    - name: Setup cache config
+      run: |
+        echo "import os" >> $EMSDK/.emscripten
+        echo "CACHE = os.path.expanduser('~/cache')" >> $EMSDK/.emscripten
+        echo "V8_ENGINE = [os.path.expanduser('~/.jsvu/bin/v8')]" >> $EMSDK/.emscripten
+        echo "JS_ENGINES = [NODE_JS]" >> $EMSDK/.emscripten
+        echo "if os.path.exists(V8_ENGINE[0]): JS_ENGINES.append(V8_ENGINE)" >> $EMSDK/.emscripten
+        echo "WASM_ENGINES = []" >> $EMSDK/.emscripten
+        test -f ~/vms/wasmtime && echo "WASMTIME = os.path.expanduser(os.path.join('~', 'vms', 'wasmtime')) ; WASM_ENGINES.append(WASMTIME)" >> $EMSDK/.emscripten || true
+        test -f ~/vms/wasmer && echo "WASMER = os.path.expanduser(os.path.join('~', 'vms', 'wasmer')) ; WASM_ENGINES.append(WASMER)" >> $EMSDK/.emscripten || true
+        test -d ~/wasi-sdk && cp -a ~/wasi-sdk/lib/ $($EMSDK/upstream/bin/clang -print-resource-dir) || true
+      shell: bash
+
+    - name: Install Linux dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y ninja-build ccache
+      shell: bash
+
+    - name: Pip install
+      run: python -m pip install -r requirements-dev.txt
+      shell: bash
+
+    - name: Bootstrap
+      run: ./bootstrap
+      shell: bash
diff --git a/.github/workflows/#build-and-test-linux.yml# b/.github/workflows/#build-and-test-linux.yml#
new file mode 100644
index 0000000000000..7d99dd1c9ad4f
--- /dev/null
+++ b/.github/workflows/#build-and-test-linux.yml#
@@ -0,0 +1,218 @@
+name: Linux Build and Test
+
+on:
+  create:
+    tags:
+  push:
+    branches:
+      - main
+  pull_request:
+
+env:
+  LANG: "C.UTF-8"
+  EMSDK_NOTTY: "1"
+  EMTEST_WASI_SYSROOT: "/home/runner/wasi-sdk/wasi-sysroot"
+  EMTEST_DETECT_TEMPFILE_LEAKS: "1"
+  PYTHONUNBUFFERED: "1"
+
+permissions:
+  contents: read
+
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+    env:
+      EMCC_CORES: "4"
+      EMCC_USE_NINJA: "1"
+      EM_COMPILER_WRAPPER: "ccache"
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Get wasmer
+        run: |
+          wget https://github.com/wasmerio/wasmer/releases/download/v3.1.1/wasmer-linux-amd64.tar.gz
+          tar -xf wasmer-linux-amd64.tar.gz
+          mkdir -p ~/vms
+          cp bin/wasmer ~/vms
+
+      - name: Get wasmtime
+        run: |
+          export VERSION=v0.33.0
+          wget https://github.com/bytecodealliance/wasmtime/releases/download/$VERSION/wasmtime-$VERSION-x86_64-linux.tar.xz
+          tar -xf wasmtime-$VERSION-x86_64-linux.tar.xz
+          cp wasmtime-$VERSION-x86_64-linux/wasmtime ~/vms
+
+      - name: Get wasi-sdk-sysroot
+        run: |
+          wget https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-11/libclang_rt.builtins-wasm32-wasi-11.0.tar.gz
+          wget https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-11/wasi-sysroot-11.0.tar.gz
+          mkdir -p ~/wasi-sdk
+          tar xf libclang_rt.builtins-wasm32-wasi-11.0.tar.gz -C ~/wasi-sdk
+          tar xf wasi-sysroot-11.0.tar.gz -C ~/wasi-sdk/
+
+      - name: Install V8
+        run: |
+          cd $HOME
+          wget https://nodejs.org/dist/v15.14.0/node-v15.14.0-linux-x64.tar.xz
+          tar -xf node-v15.14.0-linux-x64.tar.xz
+          export PATH="`pwd`/node-v15.14.0-linux-x64/bin:${PATH}"
+          npm install jsvu -g
+          jsvu --os=default --engines=v8
+
+      - name: Install Emsdk
+        uses: emscripten-core/setup-emsdk@v16
+        with:
+          version: tot
+
+      - name: Set EM_CONFIG
+        run: |
+          echo "EM_CONFIG=$EMSDK/.emscripten" >> $GITHUB_ENV
+
+      - name: Setup cache config
+        run: |
+          echo "import os" >> $EMSDK/.emscripten
+          echo "CACHE = os.path.expanduser('~/cache')" >> $EMSDK/.emscripten
+          echo "V8_ENGINE = [os.path.expanduser('~/.jsvu/bin/v8')]" >> $EMSDK/.emscripten
+          echo "JS_ENGINES = [NODE_JS]" >> $EMSDK/.emscripten
+          echo "if os.path.exists(V8_ENGINE[0]): JS_ENGINES.append(V8_ENGINE)" >> $EMSDK/.emscripten
+          echo "WASM_ENGINES = []" >> $EMSDK/.emscripten
+          test -f ~/vms/wasmtime && echo "WASMTIME = os.path.expanduser(os.path.join('~', 'vms', 'wasmtime')) ; WASM_ENGINES.append(WASMTIME)" >> $EMSDK/.emscripten || true
+          test -f ~/vms/wasmer && echo "WASMER = os.path.expanduser(os.path.join('~', 'vms', 'wasmer')) ; WASM_ENGINES.append(WASMER)" >> $EMSDK/.emscripten || true
+          test -d ~/wasi-sdk && cp -a ~/wasi-sdk/lib/ $($EMSDK/upstream/bin/clang -print-resource-dir) || true
+
+      - name: Install Linux dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y ninja-build ccache
+
+      - name: Pip install
+        run: python -m pip install -r requirements-dev.txt
+
+      - name: Bootstrap
+        run: ./bootstrap
+
+      - name: Build libraries
+        run: |
+          ./emcc --clear-cache
+          ./test/runner test_hello_world
+
+      - name: Clean build directory
+        run: rm -rf ~/cache/build
+
+      - name: Archive persistent directories
+        run: tar -czf ~/emscripten-cache.tar.gz -C ~/ .jsvu cache vms wasi-sdk
+
+      - name: Persist workspace
+        uses: actions/upload-artifact@v4
+        with:
+          name: emscripten-cache
+          path: ~/emscripten-cache.tar.gz
+
+  test-sanity:
+    needs: build-linux
+    runs-on: ubuntu-latest
+    env:
+      EMCC_CORES: "4"
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Install Emsdk
+        uses: emscripten-core/setup-emsdk@v16
+        with:
+          version: tot
+
+      - name: Attach workspace
+        uses: actions/download-artifact@v4
+        with:
+          name: emscripten-cache
+          path: ~/
+
+      - name: Extract persistent directories
+        run: tar -xzf ~/emscripten-cache.tar.gz -C ~/
+
+      - name: Set EM_CONFIG
+        run: |
+          echo "EM_CONFIG=$EMSDK/.emscripten" >> $GITHUB_ENV
+
+      - name: Setup cache config
+        run: |
+          echo "import os" >> $EMSDK/.emscripten
+          echo "CACHE = os.path.expanduser('~/cache')" >> $EMSDK/.emscripten
+          echo "V8_ENGINE = [os.path.expanduser('~/.jsvu/bin/v8')]" >> $EMSDK/.emscripten
+          echo "JS_ENGINES = [NODE_JS]" >> $EMSDK/.emscripten
+          echo "if os.path.exists(V8_ENGINE[0]): JS_ENGINES.append(V8_ENGINE)" >> $EMSDK/.emscripten
+          echo "WASM_ENGINES = []" >> $EMSDK/.emscripten
+          test -f ~/vms/wasmtime && echo "WASMTIME = os.path.expanduser(os.path.join('~', 'vms', 'wasmtime')) ; WASM_ENGINES.append(WASMTIME)" >> $EMSDK/.emscripten || true
+          test -f ~/vms/wasmer && echo "WASMER = os.path.expanduser(os.path.join('~', 'vms', 'wasmer')) ; WASM_ENGINES.append(WASMER)" >> $EMSDK/.emscripten || true
+          test -d ~/wasi-sdk && cp -a ~/wasi-sdk/lib/ $($EMSDK/upstream/bin/clang -print-resource-dir) || true
+
+      - name: Install Linux dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y ninja-build ccache
+
+      - name: Pip install
+        run: python -m pip install -r requirements-dev.txt
+
+      - name: Bootstrap
+        run: ./bootstrap
+
+      - name: Run sanity tests
+        run: ./test/runner sanity
+
+  test-core0:
+    needs: build-linux
+    runs-on: ubuntu-latest
+    env:
+      EMCC_CORES: "4"
+      EMTEST_SKIP_NODE_25: "1"
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Install Emsdk
+        uses: emscripten-core/setup-emsdk@v16
+        with:
+          version: tot
+
+      - name: Attach workspace
+        uses: actions/download-artifact@v4
+        with:
+          name: emscripten-cache
+          path: ~/
+
+      - name: Extract persistent directories
+        run: tar -xzf ~/emscripten-cache.tar.gz -C ~/
+
+      - name: Set EM_CONFIG
+        run: |
+          echo "EM_CONFIG=$EMSDK/.emscripten" >> $GITHUB_ENV
+
+      - name: Setup cache config
+        run: |
+          echo "import os" >> $EMSDK/.emscripten
+          echo "CACHE = os.path.expanduser('~/cache')" >> $EMSDK/.emscripten
+          echo "V8_ENGINE = [os.path.expanduser('~/.jsvu/bin/v8')]" >> $EMSDK/.emscripten
+          echo "JS_ENGINES = [NODE_JS]" >> $EMSDK/.emscripten
+          echo "if os.path.exists(V8_ENGINE[0]): JS_ENGINES.append(V8_ENGINE)" >> $EMSDK/.emscripten
+          echo "WASM_ENGINES = []" >> $EMSDK/.emscripten
+          test -f ~/vms/wasmtime && echo "WASMTIME = os.path.expanduser(os.path.join('~', 'vms', 'wasmtime')) ; WASM_ENGINES.append(WASMTIME)" >> $EMSDK/.emscripten || true
+          test -f ~/vms/wasmer && echo "WASMER = os.path.expanduser(os.path.join('~', 'vms', 'wasmer')) ; WASM_ENGINES.append(WASMER)" >> $EMSDK/.emscripten || true
+          test -d ~/wasi-sdk && cp -a ~/wasi-sdk/lib/ $($EMSDK/upstream/bin/clang -print-resource-dir) || true
+
+      - name: Install Linux dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y ninja-build ccache
+
+      - name: Pip install
+        run: python -m pip install -r requirements-dev.txt
+
+      - name: Bootstrap
+        run: ./bootstrap
+
+      - name: Run core0 tests
+        run: ./test/runner core0
+
diff --git a/.github/workflows/build-and-test-linux.yml b/.github/workflows/build-and-test-linux.yml
new file mode 100644
index 0000000000000..aac12dec788dd
--- /dev/null
+++ b/.github/workflows/build-and-test-linux.yml
@@ -0,0 +1,233 @@
+name: Linux Build and Test
+
+on:
+  create:
+    tags:
+  push:
+    branches:
+      - main
+  pull_request:
+
+env:
+  LANG: "C.UTF-8"
+  EMSDK_NOTTY: "1"
+  EMTEST_WASI_SYSROOT: "/home/runner/wasi-sdk/wasi-sysroot"
+  EMTEST_DETECT_TEMPFILE_LEAKS: "1"
+  PYTHONUNBUFFERED: "1"
+
+permissions:
+  contents: read
+
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+    env:
+      EMCC_CORES: "4"
+      EMCC_USE_NINJA: "1"
+      EM_COMPILER_WRAPPER: "ccache"
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Get wasmer
+        run: |
+          wget https://github.com/wasmerio/wasmer/releases/download/v3.1.1/wasmer-linux-amd64.tar.gz
+          tar -xf wasmer-linux-amd64.tar.gz
+          mkdir -p ~/vms
+          cp bin/wasmer ~/vms
+
+      - name: Get wasmtime
+        run: |
+          export VERSION=v0.33.0
+          wget https://github.com/bytecodealliance/wasmtime/releases/download/$VERSION/wasmtime-$VERSION-x86_64-linux.tar.xz
+          tar -xf wasmtime-$VERSION-x86_64-linux.tar.xz
+          cp wasmtime-$VERSION-x86_64-linux/wasmtime ~/vms
+
+      - name: Get wasi-sdk-sysroot
+        run: |
+          wget https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-11/libclang_rt.builtins-wasm32-wasi-11.0.tar.gz
+          wget https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-11/wasi-sysroot-11.0.tar.gz
+          mkdir -p ~/wasi-sdk
+          tar xf libclang_rt.builtins-wasm32-wasi-11.0.tar.gz -C ~/wasi-sdk
+          tar xf wasi-sysroot-11.0.tar.gz -C ~/wasi-sdk/
+
+      - name: Install V8
+        uses: ./.github/actions/install-v8
+
+      - name: Install Emsdk
+        uses: emscripten-core/setup-emsdk@v16
+        with:
+          version: tot
+
+      - name: Set EM_CONFIG
+        run: |
+          echo "EM_CONFIG=$EMSDK/.emscripten" >> $GITHUB_ENV
+
+      - name: Setup cache config
+        run: |
+          echo "import os" >> $EMSDK/.emscripten
+          echo "CACHE = os.path.expanduser('~/cache')" >> $EMSDK/.emscripten
+          echo "V8_ENGINE = [os.path.expanduser('~/.jsvu/bin/v8')]" >> $EMSDK/.emscripten
+          echo "JS_ENGINES = [NODE_JS]" >> $EMSDK/.emscripten
+          echo "if os.path.exists(V8_ENGINE[0]): JS_ENGINES.append(V8_ENGINE)" >> $EMSDK/.emscripten
+          echo "WASM_ENGINES = []" >> $EMSDK/.emscripten
+          test -f ~/vms/wasmtime && echo "WASMTIME = os.path.expanduser(os.path.join('~', 'vms', 'wasmtime')) ; WASM_ENGINES.append(WASMTIME)" >> $EMSDK/.emscripten || true
+          test -f ~/vms/wasmer && echo "WASMER = os.path.expanduser(os.path.join('~', 'vms', 'wasmer')) ; WASM_ENGINES.append(WASMER)" >> $EMSDK/.emscripten || true
+          test -d ~/wasi-sdk && cp -a ~/wasi-sdk/lib/ $($EMSDK/upstream/bin/clang -print-resource-dir) || true
+
+      - name: Install Linux dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y ninja-build ccache
+
+      - name: Pip install
+        run: python -m pip install -r requirements-dev.txt
+
+      - name: Bootstrap
+        run: ./bootstrap
+
+      - name: Build libraries
+        run: |
+          ./emcc --clear-cache
+          ./test/runner test_hello_world
+
+      - name: Clean build directory
+        run: rm -rf ~/cache/build
+
+      - name: Archive persistent directories
+        run: tar -czf ~/emscripten-cache.tar.gz -C ~/ .jsvu cache vms wasi-sdk
+
+      - name: Persist workspace
+        uses: actions/upload-artifact@v4
+        with:
+          name: emscripten-cache
+          path: ~/emscripten-cache.tar.gz
+
+  test-sanity:
+    needs: build-linux
+    runs-on: ubuntu-latest
+    env:
+      EMCC_CORES: "4"
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Prepare for tests
+        uses: ./.github/actions/prepare-for-tests
+
+      - name: Run sanity tests
+        run: ./test/runner sanity
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-results-sanity
+          path: out/test-results.xml
+
+  test-core0:
+    needs: build-linux
+    runs-on: ubuntu-latest
+    env:
+      EMCC_CORES: "4"
+      EMTEST_SKIP_NODE_25: "1"
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Prepare for tests
+        uses: ./.github/actions/prepare-for-tests
+
+      - name: Run core0 tests
+        run: ./test/runner core0
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-results-core0
+          path: out/test-results.xml
+
+  test-wasm64-4gb:
+    needs: build-linux
+    runs-on: ubuntu-latest
+    env:
+      EMCC_CORES: 4
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Prepare for tests
+        uses: ./.github/actions/prepare-for-tests
+
+      - name: Reinstall V8
+        run: rm -rf $HOME/.jsvu
+        shell: bash
+
+      - name: Install V8
+        uses: ./.github/actions/install-v8
+
+      - name: Install Node newest
+        uses: ./.github/actions/install-node
+        with:
+          node_version: newest
+
+      - name: Configure Node v25
+        run: echo "NODE_JS = NODE_JS_TEST" >> $EMSDK/.emscripten
+        shell: bash
+
+      - name: Run wasm64_4gb tests
+        run: ./test/runner wasm64_4gb
+        shell: bash
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-results-wasm64-4gb
+          path: out/test-results.xml
+
+  test-browser-chrome:
+    needs: build-linux
+    runs-on: ubuntu-latest
+    env:
+      EMTEST_LACKS_WEBGPU: "1"
+      EMTEST_DETECT_TEMPFILE_LEAKS: "0"
+      EMTEST_HEADLESS: "1"
+      EMTEST_BROWSER: "/usr/bin/google-chrome"
+      EMTEST_CORES: "2"
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Prepare for tests
+        uses: ./.github/actions/prepare-for-tests
+
+      - name: Install Chrome
+        uses: ./.github/actions/install-chrome
+
+      - name: Run browser chrome tests
+        run: |
+          export EM_FROZEN_CACHE=""
+          ./test/runner \
+            browser.test_gl_stride \
+            browser.test_memory_growth_during_startup \
+            browser.test_pthread_large_pthread_allocation \
+            browser.test_pthread_sbrk* \
+            browser.test_pthread_asan* \
+            browser.test_webgl_multi_draw* \
+            browser.test_pthread_growth* \
+            browser.test_4gb \
+            browser.test_emmalloc_3gb* \
+            browser.test_dlmalloc_3gb \
+            browser.test_2gb_fail \
+            browser.test_audio_worklet*
+        shell: bash
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-results-browser-chrome
+          path: out/test-results.xml
+
diff --git a/.github/workflows/test-windows.yml b/.github/workflows/test-windows.yml
new file mode 100644
index 0000000000000..7f7d7e00483a8
--- /dev/null
+++ b/.github/workflows/test-windows.yml
@@ -0,0 +1,78 @@
+name: test-windows
+
+on:
+  create:
+    tags:
+  push:
+    branches:
+      - main
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  test-windows:
+    runs-on: windows-2019
+    defaults:
+      run:
+        working-directory: 'path with spaces ()'
+    env:
+      PYTHONUNBUFFERED: "1"
+      EMSDK_NOTTY: "1"
+      EMTEST_LACKS_NATIVE_CLANG: "1"
+      EMTEST_SKIP_V8: "1"
+      EMTEST_SKIP_WASM_LEGACY_EH: "1"
+      EMTEST_SKIP_WASM_EH: "1"
+      EMTEST_SKIP_WASM64: "1"
+      EMTEST_SKIP_SCONS: "1"
+      EMTEST_SKIP_RUST: "1"
+      EMTEST_SKIP_NODE_25: "1"
+      EMTEST_BROWSER: "0"
+      EMSDK_PYTHON: python
+
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+        with:
+          path: 'path with spaces ()'
+
+      - name: Setup MSVC
+        uses: ilammy/msvc-dev-cmd@v1
+
+      - name: Build launcher
+        run: |
+          cd tools\pylauncher
+          cl pylauncher.c /Fe:pylauncher.exe /O1 /GS- /link /NODEFAULTLIB /ENTRY:main /MACHINE:X64 /Brepro ucrt.lib kernel32.lib
+        shell: cmd
+
+      - name: Install pkgconfiglite
+        run: choco install -y pkgconfiglite
+
+      - name: Install Emsdk
+        uses: emscripten-core/setup-emsdk@v16
+        with:
+          version: tot
+
+      - name: Set EM_CONFIG
+        run: echo "EM_CONFIG=$env:EMSDK\.emscripten" >> $env:GITHUB_ENV
+        shell: pwsh
+
+      - name: Pip install
+        run: python -m pip install -r requirements-dev.txt
+
+      - name: Bootstrap
+        run: python bootstrap.py
+
+      - name: Crossplatform tests
+        run: test/runner.bat --crossplatform-only
+
+      - name: Sockets tests
+        run: test/runner.bat sockets.test_nodejs_sockets_echo*
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-results-windows
+          path: 'path with spaces ()/out/test-results.xml'