Refactor CLI and Twilio modules; add helper tests and comments

src/twilio/send.test.ts

@@ -0,0 +1,23 @@
+import { describe, expect, it, vi } from "vitest";
+
+import { waitForFinalStatus } from "./send.js";
+
+describe("twilio send helpers", () => {
+	it("waitForFinalStatus resolves on delivered", async () => {
+		const fetch = vi
+			.fn()
+			.mockResolvedValueOnce({ status: "queued" })
+			.mockResolvedValueOnce({ status: "delivered" });
+		const client = { messages: vi.fn(() => ({ fetch })) } as never;
+		await waitForFinalStatus(client, "SM1", 2, 0.01, console as never);
+		expect(fetch).toHaveBeenCalledTimes(2);
+	});
+
+	it("waitForFinalStatus exits on failure", async () => {
+		const fetch = vi.fn().mockResolvedValue({ status: "failed", errorMessage: "boom" });
+		const client = { messages: vi.fn(() => ({ fetch })) } as never;
+		const runtime = { log: console.log, error: () => {}, exit: vi.fn(() => { throw new Error("exit"); }) } as never;
+		await expect(waitForFinalStatus(client, "SM1", 1, 0.01, runtime)).rejects.toBeInstanceOf(Error);
+	});
+});
+