[RFC] Add Guix vmupdate backend#211

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Commits on May 19, 2026

Add Guix vmupdate backend

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Commits on Jun 2, 2026

vmupdate/guix: update via guix pull and guix system reconfigure
noufalkv
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vmupdate/guix: parse manifest tabs instead of recovering stripped output
noufalkv
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vmupdate: format package versions in the change summary
noufalkv
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