fix: mock config-loader in tests to avoid missing config.js

config-loader.js dynamically imports config.js which only exists
after deployment. Mock it in tests since the utility functions
under test don't depend on config.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: mlahargou

lib/utils.test.js

@@ -1,5 +1,10 @@
-import { describe, it, expect } from "vitest";
-import utils from "./utils.js";
+import { describe, it, expect, vi } from "vitest";
+
+vi.mock("./config-loader.js", () => ({
+  default: { repos: [] },
+}));
+
+const { default: utils } = await import("./utils.js");
 
 describe("mapCheckToStatus", () => {
   it("maps in_progress to pending", () => {