chore: import upstream snapshot with attribution

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

@@ -0,0 +1,23 @@
+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 generic agent backends — every
+ * `showcase-<framework>` integration service routes through this driver
+ * (mastra, ag2, agno, llamaindex, langgraph-*, crewai-*, pydantic-ai,
+ * google-adk, claude-sdk-*, ms-agent-*, langroid, spring-ai, strands,
+ * built-in-agent — 19 services in the SSOT at WS-C completion).
+ *
+ * Baseline (this commit): Railway deployment-SUCCESS + HTTP 200 on
+ * `/api/health` (the uniform health path emitted by every showcase
+ * integration template). Future driver-specific layer: feature-level
+ * fixture POST into the integration's `/api` endpoint, asserting the
+ * AG-UI SSE stream opens and emits at least one TextMessageStart event.
+ */
+export async function probeAgent(target: ProbeTarget): Promise<ProbeOutcome> {
+  return probeBaseline(target, {
+    driverLabel: "agent",
+    healthcheckPath: "/api/health",
+  });
+}