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dir_size: SYNO.FileStation.DirSize v2 — async scan of one or more directories, returns folder/file count and total size as a table. get_md5: SYNO.FileStation.MD5 v2 — async MD5 checksum of a file. Both follow the existing _poll_task pattern. 9 new unit tests. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>