Integrate M365 grounding knowledge via Copilot Retrieval API

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PRD: M365 Grounding Knowledge Integration

Objective

Integrate grounding knowledge sources (SharePoint, OneDrive, Graph Connectors) using M365 Copilot Retrieval API from the M365 Agents SDK (.NET library).

Tasks

• Integrate .NET library for M365 Copilot Retrieval API.
• Implement configuration and authentication for M365 sources.
• Expose knowledge retrieval capability to agent plugins.
• Document setup and usage.

Acceptance Criteria

• Simulator can access M365 sources with proper auth/configuration.