chore: import upstream snapshot with attribution

showcase/scripts/verify-deploy.drivers.docs.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 `shell-docs` Next.js service.
+ *
+ * Baseline (this commit): Railway deployment-SUCCESS + HTTP 200 on `/`.
+ * Future driver-specific layer: DOM-string assertion + the structural
+ * `<main>` + `<h1>` heuristic from `probe-shell-docs.ts` so a 200 with
+ * the 404 chrome is still treated as red. That extension composes on
+ * top of `probeBaseline` once the per-driver micro-task lands.
+ */
+export async function probeDocs(target: ProbeTarget): Promise<ProbeOutcome> {
+  return probeBaseline(target, {
+    driverLabel: "docs",
+    healthcheckPath: "/",
+  });
+}