refactor: harden FileCleanupStrategy with retry and parallel deletes#649

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shangxinli wants to merge 11 commits intoapache:mainfrom

shangxinli:pr-b-cleanup-hardening

Commits on Apr 22, 2026

feat: add file cleanup for expire snapshots

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Address review feedback from Gang Wu

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refactor: introduce FileCleanupStrategy and ReachableFileCleanup

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style: fix clang-format violations

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fix: guard manifest deletion when retained snapshot reads fail; defer stats file deletion

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style: add username to TODO per google-readability-todo

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Commits on Apr 24, 2026

polish impl to match java behavior
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