Update .NET AI ecosystem docs to feature Microsoft Agent Framework

[Copilot]

The article focused primarily on Semantic Kernel, but Microsoft Agent Framework is now the production-ready framework combining Semantic Kernel and AutoGen capabilities for agentic AI development.

Changes

• Added Microsoft Agent Framework section - Introduced as primary recommendation for agentic AI applications with multi-agent orchestration, cloud/provider flexibility, enterprise observability, and A2A/MCP protocol support
• Repositioned Semantic Kernel - Clarified active maintenance status and appropriate use cases (AI integration without complex orchestration, existing SK projects, connector ecosystem needs)
• Updated SDK table - Added Microsoft.Agents.AI.OpenAI package as first entry
• Updated local models guidance - Now references Agent Framework as the recommended tool for connecting to local models
• Updated navigation - Added Agent Framework to "Next steps" section
• Updated article date - Changed ms.date to 11/04/2025

The documentation now reflects Microsoft's current strategy where Agent Framework is recommended for new agentic applications requiring advanced orchestration, while Semantic Kernel remains suitable for simpler AI integration scenarios.

• Fixes Update for Agent Framework #49614

Original prompt

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This section details on the original issue you should resolve

<issue_title>Update for Agent Framework</issue_title>
<issue_description>### Type of issue

Outdated article

Description

Update to describe Agent Framework instead of Semantic Kernel.

Page URL

https://learn.microsoft.com/en-us/dotnet/ai/dotnet-ai-ecosystem

Content source URL

https://github.com/dotnet/docs/blob/main/docs/ai/dotnet-ai-ecosystem.md

Document Version Independent Id

e3c5a01f-35c2-6f15-4794-ec0047ac96d3

Platform Id

3ac6f5f3-3267-fd18-1ce8-f59e8dff5cfa

Article author

@gewarren

Metadata

• ID: 5732209f-e9d8-1f8b-7937-ea53f5bb16f1
• PlatformId: 3ac6f5f3-3267-fd18-1ce8-f59e8dff5cfa
• Service: dotnet
• Sub-service: intelligent-apps

Related Issues</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Update for Agent Framework #49614

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[Copilot]

Pull Request Overview

This PR updates the .NET AI ecosystem documentation to introduce Microsoft Agent Framework as a new recommended approach for building agentic AI applications. The update positions Agent Framework as the primary choice for advanced multi-agent orchestration while clarifying that Semantic Kernel remains suitable for simpler AI integration scenarios.

• Adds a new section introducing Microsoft Agent Framework and its capabilities.
• Updates guidance on when to use Semantic Kernel versus Agent Framework.
• Updates the SDK comparison table and local AI model recommendations to include Agent Framework.

[meaghanlewis]

These changes LGTM!