add get-disk command for VMDK/VHD extraction#2
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Adds a new `get-disk` command that extracts a virtual disk from a VBK archive as a flat raw image. Multi-extent VMDKs are reassembled automatically by the underlying vbktoolkit OpenDiskImage API. - SHA-256 verification computed inline during extraction (io.MultiWriter) rather than in a second read pass, keeping memory and I/O constant regardless of disk size - Output file is removed automatically on any error after creation, preventing partial images from being left on disk - BytesWritten is validated against the image's reported DiskSize; a mismatch is treated as a hard error - Exports vbkshell.NormalizePath so path handling is shared rather than duplicated across commands - Pins the local vbktoolkit replace directive, which fixes the root cause: DirItem.Open() previously rejected DirItemExtFib files (external files), meaning any VMDK stored as an external entry could not be read Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Extract virtual disks as flat raw images