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Closes #1064 Use the multipart ETag as the in-progress directory suffix instead of the static `.inprogress` marker so that concurrent CompleteMultipartUpload calls for the same upload ID are all treated as successful (idempotent) rather than racing, where only one succeeded and the rest returned NoSuchUpload. After finalizing the multipart upload, store an `mp-metadata` xattr on the assembled object that records the upload ID and cumulative byte offsets for each part. GetObject and HeadObject now use this metadata to serve individual part ranges via the `partNumber` query parameter, returning a successful response instead of returning NotImplemented. Add two new S3 error codes: - `ErrInvalidPartNumberRange` (416 RequestedRangeNotSatisfiable) — returned when the requested part number exceeds the number of parts in the upload. - `ErrRangeAndPartNumber` (400 BadRequest) — returned when both a Range header and a partNumber query parameter are specified on the same request.