chore: import upstream snapshot with attribution

showcase/scripts/verify-deploy.drivers.harness.ts

@@ -0,0 +1,19 @@
+import type { ProbeTarget } from "./verify-deploy";
+import type { ProbeOutcome } from "./verify-deploy.drivers";
+import { probeBaseline } from "./verify-deploy.drivers.baseline";
+
+/**
+ * Feature-level verifier for the `showcase-harness` API service.
+ *
+ * Baseline (this commit): Railway deployment-SUCCESS + HTTP 200 on
+ * `/health` (the harness's documented healthcheck path; mirrors the
+ * `health_path` table in `.github/workflows/showcase_deploy.yml`).
+ * Future driver-specific layer: synthetic e2e fixture call against
+ * the harness's `/run` API.
+ */
+export async function probeHarness(target: ProbeTarget): Promise<ProbeOutcome> {
+  return probeBaseline(target, {
+    driverLabel: "harness",
+    healthcheckPath: "/health",
+  });
+}