* Getting started samples which use OpenAI exchange types * Update dotnet/src/Microsoft.Extensions.AI.Agents.OpenAI/Extensions/AgentRunResponseUpdateExtensions.cs Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * Update dotnet/src/Microsoft.Extensions.AI.Agents.OpenAI/Extensions/AgentRunResponseUpdateExtensions.cs Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * Update dotnet/src/Microsoft.Extensions.AI.Agents.OpenAI/ChatCompletion/StreamingUpdatePipelineResponse.cs Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * Update dotnet/samples/GettingStarted/AgentWithOpenAI/README.md Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * Fix pipeline response * Update dotnet/samples/GettingStarted/AgentWithOpenAI/README.md Co-authored-by: Roger Barreto <19890735+rogerbarreto@users.noreply.github.com> * Update comment to reflect OpenAI backend usage --------- Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: Roger Barreto <19890735+rogerbarreto@users.noreply.github.com>