[dotnet-ai] Agent stack (agentic-workflow + copilot-sdk-integration)

[luisquintanilla]

Fixes #232
Part of #225

Dependencies

Merge order: This PR should be merged after:

• #237 Plugin scaffold + MEAI chat integration
• #240 MEAI embeddings agent tools may use embeddings

Summary

Adds two agent stack skills that cover the Runtime and Harness layers of the .NET AI stack:

• agentic-workflow Microsoft Agent Framework (MAF): AIAgent, AgentSession, AsAIFunction for multi-agent composition, durable agents with AgentSessionManager, and A2A (Agent-to-Agent) protocol
• copilot-sdk-integration GitHub Copilot SDK three dimensions: LLM backend (zero-config auth, BYOK), agent harness (sessions, MCP, safe outputs), platform extensions. Includes the Bridge Pattern (prototype with CopilotClient deploy with Azure via AsAIAgent())

Changes

File	Description
plugins/dotnet-ai/skills/agentic-workflow/SKILL.md	MAF AIAgent lifecycle, AgentSession, AsAIFunction, durable agents, A2A protocol
plugins/dotnet-ai/skills/copilot-sdk-integration/SKILL.md	Three integration paths, Bridge Pattern, BYOK table, known limitations
tests/dotnet-ai/agentic-workflow/eval.yaml	Eval: multi-step agent with tools scenario
tests/dotnet-ai/copilot-sdk-integration/eval.yaml	Eval: Copilot SDK agent + production rejection scenarios

Key Packages

• Microsoft.Agents.AI (MAF, prerelease)
• GitHub.Copilot.SDK (Copilot SDK, preview)
• Microsoft.Agents.AI.GitHub.Copilot (bridge package)

Validation

• Both SKILL.md files have valid YAML frontmatter
• agentic-workflow covers AIAgent, AgentSession, AsAIFunction, durable agents, A2A
• copilot-sdk-integration covers three paths + Bridge Pattern + limitations
• Both eval.yaml files have scenarios

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