Add CLI and infra test coverage

src/webhook/server.test.ts

@@ -0,0 +1,10 @@
+import { describe, expect, it } from "vitest";
+
+import * as impl from "../twilio/webhook.js";
+import * as entry from "./server.js";
+
+describe("webhook server wrapper", () => {
+	it("re-exports startWebhook", () => {
+		expect(entry.startWebhook).toBe(impl.startWebhook);
+	});
+});