feat(project): init

tests/quota.test.ts

@@ -0,0 +1,9 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { getCurrentPeriodKey } from "../lib/quota-core";
+
+test("getCurrentPeriodKey formats a UTC year-month string", () => {
+  const periodKey = getCurrentPeriodKey(new Date("2026-04-24T08:00:00.000Z"));
+
+  assert.equal(periodKey, "2026-04");
+});