Add `dotnetup` Version Intent & Timeline Doc#55390

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nagilson wants to merge 15 commits into

dotnet:release/dnupfrom

nagilson:nagilson-dotnetup-support-policy

Commits on Jul 20, 2026

Commits on Jul 21, 2026

Mention how long `dotnetup` would receive support if it were deprecated
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Merge branch 'nagilson-dotnetup-support-policy' of https://github.com/nagilson/sdk into nagilson-dotnetup-support-policy
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Tighten verbage of support policy
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mention daily builds may still receive breaking change notices
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preview versions could be on a non preview .net
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Replace microsoft with .NET teams to clarify this is not a microsoft official policy
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Clarify noun of ownership of support policy
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mention preview versions are offered for public testing just like .net preview policy docs state
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