test(ci): budget the 128-mutation OAuth tail case for windows-latest

The admission test performs 128 serialized load-modify-persist store
mutations as its assertion; windows-latest measured 7.3 seconds against
Bun's 5-second default, so it gets the store budget with the measurement
recorded.

Author: lidge-jun

tests/oauth-store-multi.test.ts

@@ -1,4 +1,5 @@
 import { afterEach, beforeEach, describe, expect, test } from "bun:test";
+import { STORE_BUDGET_MS } from "./helpers/test-budget";
 import { existsSync, mkdirSync, readFileSync, rmSync, writeFileSync } from "node:fs";
 import { join } from "node:path";
 import {
@@ -272,7 +273,7 @@ describe("multi-account auth store", () => {
     await Promise.all(accepted);
     expect(executions).toBe(128);
     expect(oauthMutationTailSnapshot().active).toBe(0);
-  });
+  }, STORE_BUDGET_MS); // 128 serialized load-modify-persist store mutations; windows-latest measured ~7.3s against Bun's 5s default.
 
   test("OAuth 30 second wait timeout releases an unstarted lease and never enters the chain", async () => {
     let releaseFirst!: () => void;