Exercise CI failure gate on temporary branch

agiledancers-be/src/test/java/nl/agilecc/agiledancers/PipelineFailureProbeTest.java

@@ -0,0 +1,11 @@
+package nl.agilecc.agiledancers;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.fail;
+
+/** Temporary branch-only probe: verify that failed tests prevent publication. */
+class PipelineFailureProbeTest {
+    @Test void blocksPublication() {
+        fail("S4 acceptance probe: deliberate test failure");
+    }
+}