.NET: Support reasoning events in AGUI#4953

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jeffinsibycoremont wants to merge 4 commits intomicrosoft:mainfrom

jeffinsibycoremont:feature/support-reasoning

Commits on Mar 30, 2026

Support reasoning
jeffinsibycoremont
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MEAI gives the same MessageId for reasoning and text content because they are part of the same logical model response. Create a new GUID for reasoning messages to be consistent with AGUI protocol a…
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Commits on Apr 1, 2026

When a frontend AG-UI client sends conversation history back in a subsequent POST, any accumulated role: "reasoning" messages fail deserialization in AGUIMessageJsonConverter because the role wasn'…
jeffinsibycoremont
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Added MapReasoningMessage - converts a ChatMessage containing TextReasoningContent to AGUIReasoningMessage for c# client
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