fix: parallelize and bound OS shutdown disk saves#61
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Save all mounted disks concurrently on SystemEvents.SessionEnding instead of sequentially, and skip disks with no unsaved changes, so multi-disk saves are more likely to complete within the Windows shutdown time budget. Bound the wait with a timeout so a single stuck save can't block the callback indefinitely, and extract the shared dirty/path-changed skip condition into RamDisk.NeedsSave() to avoid duplicating it across SaveToImageSafe, TryAutoSave, and Dispose.
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Save all mounted disks concurrently on SystemEvents.SessionEnding instead of sequentially, and skip disks with no unsaved changes, so multi-disk saves are more likely to complete within the Windows shutdown time budget. Bound the wait with a timeout so a single stuck save can't block the callback indefinitely, and extract the shared dirty/path-changed skip condition into RamDisk.NeedsSave() to avoid duplicating it across SaveToImageSafe, TryAutoSave, and Dispose.