Add adapters to allow SK agents to be exposed as AIAgent

[westey-m]

Motivation and Context

microsoft/agent-framework#1122

Description

Add adapters to allow SK agents to be exposed as AIAgent

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[Copilot]

Pull Request Overview

This PR adds adapters to allow Semantic Kernel (SK) agents to be exposed as AIAgent implementations from the Microsoft Agent Framework. The implementation provides a common interface conformance pattern that enables different agent types to work through the same AIAgent abstraction.

• Introduces AIAgentAdapter and AIAgentThreadAdapter classes to bridge SK agents with the Microsoft Agent Framework
• Adds extension methods for each agent type (OpenAI, Azure AI, Bedrock, etc.) to convert to AIAgent
• Creates comprehensive unit and integration tests to verify the adapter functionality

Reviewed Changes

Copilot reviewed 37 out of 37 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
dotnet/src/Agents/Abstractions/AIAgent/AIAgentAdapter.cs	Core adapter class that wraps SK agents and exposes them as AIAgent
dotnet/src/Agents/Abstractions/AIAgent/AIAgentThreadAdapter.cs	Thread adapter for bridging SK agent threads with AIAgent threads
dotnet/src/Agents/Abstractions/AgentExtensions.cs	Base extension method for converting any SK agent to AIAgent
dotnet/src/Agents/*/Extensions.cs	Agent-specific extension methods for each agent type
Unit test files	Comprehensive test coverage for all adapter functionality
Integration test files	End-to-end testing of adapter conformance

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