.Net: Add Google.GenAI ChatClient support with IChatClient polyfill#13404

Draft

Copilot wants to merge 9 commits intomainfrom

copilot/add-google-chat-client-service

Commits on Dec 3, 2025

Initial plan
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Add Google.GenAI ChatClient support with IChatClient polyfill and extension methods

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Add vertexAI parameter to extension methods and update Google.GenAI to 0.6.0

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Remove [Experimental] attributes from alpha pre-release APIs

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Add unit tests for GoogleGeminiChatClient and integration tests for ChatClient

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Improvements
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Split ChatClient extensions into AddGoogleGenAIChatClient and AddGoogleVertexAIChatClient

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Commits on Dec 8, 2025