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test: 修复 hash-pool 抢占测试的时序竞态 - #36
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被抢占任务 bg-a 原为 4 字节极小文件，CI 低负载下 worker 可能在 abort 消息派发前就完成哈希，导致 promise 正常 resolve 而非抛出 PreemptedError（Node 22 CI 已两次复现）。改为 64MB 与同文件并行性测试保持一致，确保抢占必然在块边界生效。
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Summary
bg-a由 4 字节改为 64MB：抢占依赖 worker 在块边界收到 abort 消息，文件过小时 worker 可能在 abort 派发前完成哈希，导致 promise 正常 resolve 而非抛PreemptedErrorTest plan
npx vitest run tests/hash-pool.test.js13/13 通过