Safe file writes now change file owner and permissions in a safer order

Claude Code saves some files by writing a complete new copy and then swapping it in, so a file is never left half written. That process can now change a file from one owner to another, and it does this in a safer order relative to changing the file's permissions. If changing the owner fails, Claude Code reports it as a distinct error. When no change of owner is asked for, the file keeps only its owner's permissions.

Before, Claude Code changed the owner once, always before the permissions.