chore: import upstream snapshot with attribution

examples/integrations/ms-agent-framework-dotnet/docker/Dockerfile.agent

@@ -0,0 +1,25 @@
+# Dockerfile for the MS Agent Framework .NET agent.
+# Two-stage build: SDK for build, ASP.NET runtime for production.
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
+
+WORKDIR /src
+COPY *.csproj ./
+RUN dotnet restore
+COPY . .
+# Patch hardcoded endpoint to read from OPENAI_BASE_URL env var
+RUN sed -i 's|Endpoint = new Uri("https://models.inference.ai.azure.com")|Endpoint = new Uri(Environment.GetEnvironmentVariable("OPENAI_BASE_URL") ?? "https://models.inference.ai.azure.com")|' Program.cs
+RUN dotnet publish -c Release -o /app
+
+FROM mcr.microsoft.com/dotnet/aspnet:9.0
+
+RUN apt-get update && apt-get install -y --no-install-recommends curl && \
+    apt-get clean && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+COPY --from=build /app .
+
+EXPOSE 8000
+
+ENV ASPNETCORE_URLS="http://0.0.0.0:8000"
+
+CMD ["./ProverbsAgent"]