Merge main into live#12903

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Commits on Jul 23, 2026

Clarify ISerializable applies to formatters, not XmlSerializer (#12897)
StephenMolloy
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Revise README for .NET 8 and Framework references (#12899)
gewarren
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Commits on Jul 24, 2026

Port missing .NET 8.0 System API docs from dotnet/runtime#88563 (#12901)

tannergooding
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Copilot
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