Fix/03.dotnet agent framework workflow ghmodel concurrent.ipynb

[Marietta (marietta-a)]

This PR aligns the notebook with the updated concurrent workflow in #684

[github-actions]

👋 Thanks for contributing Marietta (@marietta-a)! We will review the pull request and get back to you soon.

[Copilot]

Pull request overview

This PR updates the Lesson 08 multi-agent concurrent workflow .NET notebook (and its companion .cs sample) to align with the updated workflow/event-handling APIs referenced in PR #684.

Changes:

• Updated NuGet package references in the notebook to use newer major versions / version wildcards.
• Updated agent creation to use GetChatClient(...).AsIChatClient().AsAIAgent(...).
• Refactored the concurrent workflow executors to the newer attribute-based executor model ([MessageHandler], [SendsMessage], [YieldsOutput]) and moved aggregation to OnMessageDeliveryFinishedAsync.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
08-multi-agent/code_samples/workflows-agent-framework/dotNET/03.dotnet-agent-framework-workflow-ghmodel-concurrent.ipynb	Updates packages + executor implementation to match the newer concurrent workflow pattern.
08-multi-agent/code_samples/workflows-agent-framework/dotNET/03.dotnet-agent-framework-workflow-ghmodel-concurrent.cs	Updates agent creation calls and removes now-unneeded usings to match the notebook’s updated agent creation approach.

Suppressed comments (3)

08-multi-agent/code_samples/workflows-agent-framework/dotNET/03.dotnet-agent-framework-workflow-ghmodel-concurrent.ipynb:231

• This "Installed Packages" output lists OpenTelemetry.Api, 1.* instead of the resolved concrete version, which is inconsistent with the other notebooks and can confuse readers. Prefer re-running to capture the resolved version or clearing the output.

   "outputs": [
    {
     "data": {
      "text/html": [
       "<div><div></div><div></div><div><strong>Installed Packages</strong><ul><li><span>Azure.Identity, 1.15.0</span></li><li><span>OpenTelemetry.Api, 1.*</span></li><li><span>System.Linq.Async, 6.0.3</span></li></ul></div></div>"

08-multi-agent/code_samples/workflows-agent-framework/dotNET/03.dotnet-agent-framework-workflow-ghmodel-concurrent.ipynb:260

• This "Installed Packages" output lists Microsoft.Agents.AI.Workflows, 1.* rather than the resolved version. To avoid misleading readers, re-run the cell to capture the resolved version or clear the output.

   "outputs": [
    {
     "data": {
      "text/html": [
       "<div><div></div><div></div><div><strong>Installed Packages</strong><ul><li><span>Microsoft.Agents.AI.Workflows, 1.*</span></li></ul></div></div>"

08-multi-agent/code_samples/workflows-agent-framework/dotNET/03.dotnet-agent-framework-workflow-ghmodel-concurrent.ipynb:287

• This "Installed Packages" output lists Microsoft.Agents.AI.OpenAI, 1.*-* rather than the resolved concrete version. Consider re-running to capture the resolved version or clearing the output so the notebook doesn’t assert an impossible installed version string.

   "outputs": [
    {
     "data": {
      "text/html": [
       "<div><div></div><div></div><div><strong>Installed Packages</strong><ul><li><span>Microsoft.Agents.AI.OpenAI, 1.*-*</span></li></ul></div></div>"

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