Fix atomicity and durability + some small fixes#366

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bigerl wants to merge 17 commits into

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dice-group:feature/durable-file-handling

Commits on Jul 24, 2026

remove forced libc++ for clang builds

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fix munmap not unmapping when call_msync is true

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add durable file write primitives

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fix uninitialized buffer in extend_file_size_manually

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fsync after msync where msync does not flush the device cache

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write management metadata files atomically

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split datastore lock from properly-closed mark

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publish snapshots and copies atomically

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add crash and durability regression tests

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work around gcc failing on _Static_assert in macOS 26 SDK headers

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fix leaks and zero-size VLAs in tests found by ASan and UBSan

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Revert "remove forced libc++ for clang builds"

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address review

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address review (2)

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address review (3)

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address review (4)

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address review (5)

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