chore: import upstream snapshot with attribution

test/login-tracking-source.test.mjs

@@ -0,0 +1,9 @@
+import assert from "node:assert/strict";
+import { readFileSync } from "node:fs";
+import { test } from "vitest";
+
+const loginSource = readFileSync(new URL("../bin/login.ts", import.meta.url), "utf8");
+
+test("pinme login tracking sends login method through source", () => {
+  assert.match(loginSource, /source:\s*['"]cli['"]/);
+});