Use dom-on for event handlers; add CI config and stepper Playwright test

- web/orchestration.sx, web/signals.sx: dom-listen → dom-on (trampoline
  wrapper that resolves TCO thunks from Lambda event handlers)
- .gitea/: CI workflow and Dockerfile for automated test runs
- tests/playwright/stepper.spec.js: stepper widget smoke test
- Remove stale artdag .pyc file

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -1,4 +1,4 @@
-name: Build and Deploy
+name: Test, Build, and Deploy
 
 on:
   push:
@@ -10,7 +10,7 @@ env:
   BUILD_DIR: /root/rose-ash-ci
 
 jobs:
-  build-and-deploy:
+  test-build-deploy:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -29,12 +29,11 @@ jobs:
           chmod 600 ~/.ssh/id_rsa
           ssh-keyscan -H "$DEPLOY_HOST" >> ~/.ssh/known_hosts 2>/dev/null || true
 
-      - name: Build and deploy changed apps
+      - name: Sync CI build directory
         env:
           DEPLOY_HOST: ${{ secrets.DEPLOY_HOST }}
         run: |
           ssh "root@$DEPLOY_HOST" "
-            # --- Build in isolated CI directory (never touch dev working tree) ---
             BUILD=${{ env.BUILD_DIR }}
             ORIGIN=\$(git -C ${{ env.APP_DIR }} remote get-url origin)
             if [ ! -d \"\$BUILD/.git\" ]; then
@@ -43,6 +42,31 @@ jobs:
             cd \"\$BUILD\"
             git fetch origin
             git reset --hard origin/${{ github.ref_name }}
+          "
+
+      - name: Test SX language suite
+        env:
+          DEPLOY_HOST: ${{ secrets.DEPLOY_HOST }}
+        run: |
+          ssh "root@$DEPLOY_HOST" "
+            cd ${{ env.BUILD_DIR }}
+
+            echo '=== Building SX test image ==='
+            docker build \
+              -f .gitea/Dockerfile.test \
+              -t sx-test:${{ github.sha }} \
+              .
+
+            echo '=== Running SX tests ==='
+            docker run --rm sx-test:${{ github.sha }}
+          "
+
+      - name: Build and deploy changed apps
+        env:
+          DEPLOY_HOST: ${{ secrets.DEPLOY_HOST }}
+        run: |
+          ssh "root@$DEPLOY_HOST" "
+            cd ${{ env.BUILD_DIR }}
 
             # Detect changes using push event SHAs (not local checkout state)
             BEFORE='${{ github.event.before }}'