.Net: Add ThoughtSignature support for Gemini function calling#13418

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Cozmopolit wants to merge 3 commits intomicrosoft:mainfrom

Cozmopolit:feature/gemini-thought-signatures

Commits on Dec 13, 2025

feat(Gemini): Add ThoughtSignature support for thinking mode function calling
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test(Gemini): Add unit tests for ThoughtSignature support
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Commits on Jan 6, 2026

Fix Gemini streaming to accumulate tool calls from multiple chunks
Cozmopolit
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