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Regular files are now created with O_EXCL at mode 0600 and given their stored mode only after the content is written and closed, so a file whose stored mode is restrictive is never briefly readable by other local users mid-restore. A file whose write or close fails is removed rather than left partial, and a chmod failure is a user-visible warning instead of a debug line. hashVerifyReader.Close now errors when closed before EOF, so a short read or early close can never obtain a blob whose hash was not verified; downloadBlobToCache drops the cache entry on any such failure. verifyFile (--verify) now rejects a restored file with bytes past its last chunk. Tests cover each behaviour under umask 022. Model: opus-4-8