chore: import upstream snapshot with attribution

dotnet/nuget/NUGET.md

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+# About Microsoft Agent Framework
+
+Microsoft Agent Framework is a comprehensive .NET library for building, orchestrating, and deploying AI agents and multi-agent workflows. The framework provides everything from simple chat agents to complex multi-agent systems with graph-based orchestration capabilities.
+
+## Key Features
+
+- **Multi-Agent Orchestration**: Coordinate multiple agents using sequential, concurrent, group chat, and handoff patterns
+- **Graph-based Workflows**: Connect agents and functions with streaming, checkpointing, and human-in-the-loop capabilities, with both imperative or declarative workflow support
+- **Multiple Provider Support**: Seamlessly integrate with various LLM providers with more being added continuously
+- **Extensible Middleware**: Flexible request/response processing with custom pipelines and exception handling
+- **Built-in Observability**: OpenTelemetry integration for distributed tracing, monitoring, and debugging
+- **Cross-Platform**: Compatible with .NET 8.0, .NET Standard 2.0, and .NET Framework for broad deployment options
+
+Whether you're building simple AI assistants or complex multi-agent systems, Microsoft Agent Framework provides the tools and abstractions needed to create robust, scalable AI applications in .NET.
+
+# Getting Started ⚡
+
+- Learn more at the [documentation site](https://learn.microsoft.com/agent-framework/overview/agent-framework-overview).
+- Join the [Discord community](https://discord.gg/b5zjErwbQM).
+- Follow the team on [Semantic Kernel blog](https://devblogs.microsoft.com/semantic-kernel/).
+- Check out the [GitHub repository](https://github.com/microsoft/agent-framework) for the latest updates.

dotnet/nuget/nuget-package.props

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+<Project>
+  <PropertyGroup>
+    <!-- Central version prefix - applies to all nuget packages. -->
+    <VersionPrefix>1.13.0</VersionPrefix>
+    <RCNumber>1</RCNumber>
+    <DateSuffix>260703</DateSuffix>
+    <PackageVersion Condition="'$(IsReleaseCandidate)' == 'true'">$(VersionPrefix)-rc$(RCNumber)</PackageVersion>
+    <PackageVersion Condition="'$(IsReleaseCandidate)' != 'true' AND '$(VersionSuffix)' != ''">$(VersionPrefix)-$(VersionSuffix).$(DateSuffix).1</PackageVersion>
+    <PackageVersion Condition="'$(IsReleaseCandidate)' != 'true' AND '$(VersionSuffix)' == ''">$(VersionPrefix)-preview.$(DateSuffix).1</PackageVersion>
+    <PackageVersion Condition="'$(IsReleased)' == 'true'">$(VersionPrefix)</PackageVersion>
+    <GitTag>1.13.0</GitTag>
+
+    <Configurations>Debug;Release;Publish</Configurations>
+    <IsPackable>true</IsPackable>
+
+    <!-- Package validation. Baseline Version should be the latest version available on NuGet. -->
+    <PackageValidationBaselineVersion>1.0.0</PackageValidationBaselineVersion>
+    <!-- Enable validation for GA packages -->
+    <EnablePackageValidation Condition="'$(IsReleased)' == 'true'">true</EnablePackageValidation>
+    <!-- Validate assembly attributes only for Publish builds -->
+    <NoWarn Condition="'$(Configuration)' != 'Publish'">$(NoWarn);CP0003</NoWarn>
+    <!-- Do not validate reference assemblies -->
+    <NoWarn>$(NoWarn);CP1002</NoWarn>
+
+    <!-- Enable NuGet package auditing -->
+    <NuGetAudit>true</NuGetAudit>
+
+    <!-- Audit direct and transitive packages -->
+    <NuGetAuditMode>all</NuGetAuditMode>
+
+    <!-- Report low, moderate, high and critical advisories -->
+    <NuGetAuditLevel>low</NuGetAuditLevel>
+
+
+    <!-- Default description and tags. Packages can override. -->
+    <Authors>Microsoft</Authors>
+    <Company>Microsoft</Company>
+    <Product>Microsoft Agent Framework</Product>
+    <Description>Microsoft Agent Framework is a comprehensive .NET library for building, orchestrating, and deploying AI agents and multi-agent workflows. The framework provides everything from simple chat agents to complex multi-agent systems with graph-based orchestration capabilities.</Description>
+    <PackageTags>AI, Artificial Intelligence, Agent, SDK, Framework</PackageTags>
+    <PackageId>$(AssemblyName)</PackageId>
+
+    <!-- Required license, copyright, and repo information. Packages can override. -->
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+    <Copyright>© Microsoft Corporation. All rights reserved.</Copyright>
+    <PackageProjectUrl>https://learn.microsoft.com/agent-framework/</PackageProjectUrl>
+    <RepositoryUrl>https://github.com/microsoft/agent-framework</RepositoryUrl>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+
+    <!-- Use icon and NUGET readme from dotnet/nuget folder -->
+    <PackageIcon>icon.png</PackageIcon>
+    <PackageIconUrl>icon.png</PackageIconUrl>
+    <PackageReadmeFile>NUGET.md</PackageReadmeFile>
+
+    <!-- Build symbol package (.snupkg) to distribute the PDB containing Source Link -->
+    <IncludeSymbols>true</IncludeSymbols>
+    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+
+    <!-- Include the XML documentation file in the NuGet package. -->
+    <DocumentationFile>bin\$(Configuration)\$(TargetFramework)\$(AssemblyName).xml</DocumentationFile>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <!-- SourceLink allows step-through debugging for source hosted on GitHub. -->
+    <!-- https://github.com/dotnet/sourcelink -->
+    <PackageReference Include="Microsoft.SourceLink.GitHub" PrivateAssets="All" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <!-- Include icon.png and NUGET.md in the project. -->
+    <None Include="$(RepoRoot)/dotnet/nuget/icon.png" Link="icon.png" Pack="true" PackagePath="." />
+    <None Include="$(RepoRoot)/dotnet/nuget/NUGET.md" Link="NUGET.md" Pack="true" PackagePath="." />
+  </ItemGroup>
+
+  <PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
+    <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
+  </PropertyGroup>
+</Project>