fix: harden multipart copy source-size handling#3
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Capture finalSize under lock, use HeadBlob source-size validation, and fail fast on impossible unmodified-copy ranges to avoid copy thrash. Co-Authored-By: Warp <agent@warp.dev>
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Summary
finalSizewhile holdinginode.mubefore launching multipart completionfinalSizeintocompleteMultipart/copyUnmodifiedPartsHeadBlobbeforeUploadPartCopyERANGE) when required unmodified-copy ranges exceed source sizeValidation
go test ./core -run '^$'