Add .NET Copilot Studio sample agent

[Yogeshp-MSFT]

Description:

Adds a new .NET 8.0 sample demonstrating how to integrate a Microsoft Copilot Studio agent with the Agent 365 SDK. This is the .NET counterpart to the existing Node.js Copilot Studio sample.

What it does:

• Proxies messages between Agent 365 channels (Teams, email) and a published Copilot Studio agent via the Power Platform API
• Uses Microsoft.Agents.CopilotStudio.Client for OBO token-based invocation
• Includes A365 observability (OpenTelemetry), notifications, and typing indicators

Files added:

• Agent/MyAgent.cs — message routing, install/uninstall handling, typing indicator loop
• Client/CopilotStudioAgentClient.cs — Copilot Studio client wrapper with OBO token provider
• telemetry/ — A365 observability, metrics, and OTEL extensions
• Program.cs, AspNetExtensions.cs — DI setup and JWT validation
• appsettings.json / appsettings.Playground.json — production and local dev configs
• README.md — setup guide, prerequisites, architecture, troubleshooting

Path: dotnet/copilot-studio/sample-agent/

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[Copilot]

Pull request overview

Adds a new .NET 8 sample agent that proxies Agent 365 SDK messages to a published Copilot Studio agent (via Power Platform API), including auth (OBO), basic hosting, and observability scaffolding.

Changes:

• Introduces a new dotnet/copilot-studio/sample-agent/ project (agent + Copilot Studio client wrapper).
• Adds OpenTelemetry/A365 observability helpers (metrics/tracing wrapper + OTEL configuration).
• Adds sample configuration, launch profiles, and a setup/troubleshooting README.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 11 comments.

Show a summary per file

File	Description
dotnet/copilot-studio/sample-agent/telemetry/AgentOTELExtensions.cs	OTEL setup for logging/metrics/tracing + health endpoint filtering.
dotnet/copilot-studio/sample-agent/telemetry/AgentMetrics.cs	Defines custom metrics and helper wrappers for “observed” operations.
dotnet/copilot-studio/sample-agent/telemetry/A365OtelWrapper.cs	Wraps agent operations with A365 baggage + exporter token-cache registration.
dotnet/copilot-studio/sample-agent/appsettings.json	Production-style configuration template (Copilot Studio + connections + observability).
dotnet/copilot-studio/sample-agent/appsettings.Playground.json	Playground/local config template with placeholders and comments.
dotnet/copilot-studio/sample-agent/README.md	Sample documentation: prerequisites, setup, architecture, troubleshooting.
dotnet/copilot-studio/sample-agent/Properties/launchSettings.json	Local launch profiles (Development + Playground).
dotnet/copilot-studio/sample-agent/Program.cs	ASP.NET host wiring, DI, authentication, routing, and endpoints.
dotnet/copilot-studio/sample-agent/CopilotStudioSampleAgent.csproj	New .NET 8 web project + package references.
dotnet/copilot-studio/sample-agent/Client/CopilotStudioAgentClient.cs	Copilot Studio invocation wrapper + factory and token provider.
dotnet/copilot-studio/sample-agent/AspNetExtensions.cs	JWT bearer validation setup (TokenValidation options).
dotnet/copilot-studio/sample-agent/Agent/MyAgent.cs	AgentApplication implementation (routing + typing loop + Copilot Studio call).
dotnet/copilot-studio/sample-agent/.gitignore	Ignores build artifacts and common secret/config outputs.

[Yogeshp-MSFT]

HI @ajmfehr can you review this and approve?