fix(test): 测试裸仓关 receive.autogc，消除 JGit 后台 gc 与 @TempDir 清理赛跑（dev-board#500） - #757
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…rd#500） CI run 34168686921 的 MemoryLwwMergeTest 间歇报 Failed to delete temp directory ... hub.git/gc.log.lock。根因：往 file:// 裸仓 push 时 JGit 在 进程内跑 ReceivePack，收尾按远端配置 receive.autogc（默认 true）触发 auto gc，auto gc 默认 autoDetach 在后台线程跑；gc.log.lock 在调用线程 同步建、后台线程异步删，与 JUnit 递归删 @tempdir 赛跑。 新增 com.checkba.version.BareHub.init(dir) 统一建测试裸仓并写入 receive.autogc=false，五处 Git.init().setBare(true) 全部收拢。 探针：autogc 开着 push 后 gc.log.lock 残留 99/100，关掉 0/100； MemoryLwwMergeTest+MemorySyncRoundTripTest 循环 20 轮 0 失败。 version-control.md 地雷 #49 记录。 Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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问题
GitHub Actions run 34168686921 的 Backend (mvn test) 间歇性报错：
根因
往 file:// 裸仓 push 时 JGit 6.9 在本进程内跑
ReceivePack，收尾按远端仓库配置receive.autogc（默认 true）调Repository.autoGC；auto gc 又按gc.autoDetach（默认 true）丢到后台线程。gc.log.lock在调用线程上同步创建、在后台线程上异步删除，仓库再小也一样。测试方法一返回 JUnit 就递归删@TempDir，撞上那几毫秒就红。修法
JGit 没暴露可等的后台句柄，所以选关开关：新增
com.checkba.version.BareHub.init(dir)统一建测试裸仓并写入receive.autogc=false，把五处Git.init().setBare(true)全部收拢（MemoryLwwMergeTest/MemorySyncRoundTripTest/CloudSyncUploadTest/CloudSyncUpdateTest/ProjectRepoRemoteTest，后三个是同一病灶的潜伏点）。生产侧不受影响。验证
gc.log.lock残留 99/100 次，关掉后 0/100。mvn -o -Dtest='MemoryLwwMergeTest,MemorySyncRoundTripTest' test循环 20 轮，20/20 通过。CloudSyncUploadTest(8)/CloudSyncUpdateTest(14)/ProjectRepoRemoteTest(4) 全绿。.claude/agents/version-control.md地雷 feat(libreoffice): webview-side editor endpoint, composed + verified (dormant) / webview 侧编辑器端点(组装+已验证,休眠) #49 记录。Closes zeweihan/dev-board#500
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