chore: import upstream snapshot with attribution

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

@@ -0,0 +1,20 @@
+import type { ProbeTarget } from "./verify-deploy";
+import type { ProbeOutcome } from "./verify-deploy.drivers";
+import { probeBaseline } from "./verify-deploy.drivers.baseline";
+
+/**
+ * Feature-level verifier for `showcase-webhooks` (eval webhook relay).
+ *
+ * Baseline (this commit): Railway deployment-SUCCESS + HTTP 200 on
+ * `/api/health` (matches the API-shaped service convention used by
+ * every other agent/relay service in the SSOT). Future driver-specific
+ * layer: synthetic event POST + downstream-fanout confirmation.
+ */
+export async function probeWebhooks(
+  target: ProbeTarget,
+): Promise<ProbeOutcome> {
+  return probeBaseline(target, {
+    driverLabel: "webhooks",
+    healthcheckPath: "/api/health",
+  });
+}