railiance: initial bootstrap scaffold

.github/workflows/tests.yml

@@ -0,0 +1,11 @@
+name: railiance-tests
+on: [push, pull_request]
+jobs:
+  smoke:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: K8s smoke (placeholder)
+        run: |
+          echo "Provide kubeconfig in CI or run locally:"
+          echo "  KUBECONFIG=/etc/rancher/k3s/k3s.yaml ./tests/smoke_kube.sh"