diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6311fa0..670c367 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -218,3 +218,55 @@ jobs:
             echo "::error::Layout regression tests failed (exit code $LAYOUT_EXIT)"
             exit 1
           fi
+
+  export-validation:
+    name: Export validation (Linux)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+
+      - uses: ./.github/actions/load-godot-toolchain
+        id: godot-config
+
+      - name: Download Godot
+        shell: bash
+        run: |
+          set -euo pipefail
+          mkdir -p .tools
+          curl -fsSL "${{ steps.godot-config.outputs.linux_url }}" -o /tmp/godot_linux.zip
+          printf '%s  %s\n' "${{ steps.godot-config.outputs.linux_sha256 }}" /tmp/godot_linux.zip | shasum -a 256 -c -
+          unzip -oq /tmp/godot_linux.zip -d .tools/
+          chmod +x .tools/Godot_v${{ steps.godot-config.outputs.version }}-${{ steps.godot-config.outputs.status }}_linux.x86_64
+
+      - name: Install export templates
+        shell: bash
+        run: |
+          set -euo pipefail
+          mkdir -p ~/.local/share/godot/export_templates/${{ steps.godot-config.outputs.version }}.${{ steps.godot-config.outputs.status }}
+          curl -fsSL "${{ steps.godot-config.outputs.templates_url }}" -o /tmp/godot_export_templates.tpz
+          printf '%s  %s\n' "${{ steps.godot-config.outputs.templates_sha256 }}" /tmp/godot_export_templates.tpz | shasum -a 256 -c -
+          unzip -oq /tmp/godot_export_templates.tpz -d /tmp/godot_export_templates
+          cp -f /tmp/godot_export_templates/templates/* ~/.local/share/godot/export_templates/${{ steps.godot-config.outputs.version }}.${{ steps.godot-config.outputs.status }}/
+
+      - name: Export Linux build
+        shell: bash
+        run: |
+          set -euo pipefail
+          mkdir -p build/export-validation/linux
+          .tools/Godot_v${{ steps.godot-config.outputs.version }}-${{ steps.godot-config.outputs.status }}_linux.x86_64 --headless --path . --export-release "Linux/X11" ./build/export-validation/linux/windowstead.x86_64
+
+      - name: Verify export output
+        shell: bash
+        run: |
+          set -euo pipefail
+          BINARY="build/export-validation/linux/windowstead.x86_64"
+          PCK="build/export-validation/linux/windowstead.pck"
+          if [ ! -s "$BINARY" ]; then
+            echo "::error::Export binary not found or empty: $BINARY"
+            exit 1
+          fi
+          if [ ! -s "$PCK" ]; then
+            echo "::error::Export PCK not found or empty: $PCK"
+            exit 1
+          fi
+          echo "Export validation passed — binary and PCK present"