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The download writer's temp files are now named .quak-<pid>-<random>.tmp. removeLeftoverTempFiles moves from the backup into the download module and deletes a .quak-*.tmp file only when the process ID in its name is no longer running; the content cache calls it at open() instead of deleting every temp file, so a download in progress in another process sharing the cache survives. The README backup layout and TODO.md are updated. Model: opus-5-5