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* s3api: resolve volume data encryption in CopyObject SSE flows (#11646) * s3api: honor bucket-default KMS key on copy and fix transformed-upload metadata - Synthesize the destination bucket's default encryption as request headers before any SSE evaluation, so the configured KMS key ID and bucket-key setting reach the copy paths instead of only a boolean. - uploadTransformedChunkData returns the upload result so callers record the uploader's cipher key AND compression decision; a wrongly cleared IsCompressed made transformed copies unreadable. - decompressChunkVolumeCipher fails loudly when a compressed chunk does not decompress, instead of uploading still-compressed bytes marked uncompressed. - copyMultipartSSECChunk now strips the volume cipher and re-encrypts on upload like the other transform paths. - The ciphered inner upload now uses the caller's private BytesBuffer. * s3api: extract copy bucket-default header synthesis for coverage Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * s3api: test bucket-default encryption header synthesis on copy Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * s3api: validate copy encryption headers before bucket defaults and resolve empty KMS key * s3api: name the AWS-managed SSE-KMS default key once --------- Co-authored-by: Chris Lu <chrislusf@users.noreply.github.com> Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>