Add ModelContextProtocol assemblies to signing list

[joperezr]

Description

The official build is currently failing with:

##[error].packages\microsoft.dotnet.arcade.sdk\11.0.0-beta.25509.1\tools\Sign.proj(76,5): error SIGN004: Signing 3rd party library 'D:\a\_work\1\s\artifacts\tmp\Release\ContainerSigning\369\tools/ModelContextProtocol.AspNetCore.dll' with Microsoft certificate 'Microsoft400'. The library is considered 3rd party library due to its copyright: '© Anthropic and Contributors.'.
D:\a\_work\1\s\.packages\microsoft.dotnet.arcade.sdk\11.0.0-beta.25509.1\tools\Sign.proj(76,5): error SIGN004: Signing 3rd party library 'D:\a\_work\1\s\artifacts\tmp\Release\ContainerSigning\369\tools/ModelContextProtocol.AspNetCore.dll' with Microsoft certificate 'Microsoft400'. The library is considered 3rd party library due to its copyright: '© Anthropic and Contributors.'.
##[error].packages\microsoft.dotnet.arcade.sdk\11.0.0-beta.25509.1\tools\Sign.proj(76,5): error SIGN004: Signing 3rd party library 'D:\a\_work\1\s\artifacts\tmp\Release\ContainerSigning\370\tools/ModelContextProtocol.Core.dll' with Microsoft certificate 'Microsoft400'. The library is considered 3rd party library due to its copyright: '© Anthropic and Contributors.'.
D:\a\_work\1\s\.packages\microsoft.dotnet.arcade.sdk\11.0.0-beta.25509.1\tools\Sign.proj(76,5): error SIGN004: Signing 3rd party library 'D:\a\_work\1\s\artifacts\tmp\Release\ContainerSigning\370\tools/ModelContextProtocol.Core.dll' with Microsoft certificate 'Microsoft400'. The library is considered 3rd party library due to its copyright: '© Anthropic and Contributors.'.
##[error].packages\microsoft.dotnet.arcade.sdk\11.0.0-beta.25509.1\tools\Sign.proj(76,5): error SIGN004: Signing 3rd party library 'D:\a\_work\1\s\artifacts\tmp\Release\ContainerSigning\371\tools/ModelContextProtocol.dll' with Microsoft certificate 'Microsoft400'. The library is considered 3rd party library due to its copyright: '© Anthropic and Contributors.'.
D:\a\_work\1\s\.packages\microsoft.dotnet.arcade.sdk\11.0.0-beta.25509.1\tools\Sign.proj(76,5): error SIGN004: Signing 3rd party library 'D:\a\_work\1\s\artifacts\tmp\Release\ContainerSigning\371\tools/ModelContextProtocol.dll' with Microsoft certificate 'Microsoft400'. The library is considered 3rd party library due to its copyright: '© Anthropic and Contributors.'.

These changes should fix that. (No real way to validate until we do an actual full build.

cc: @radical @JamesNK @halter73

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
• Are you including unit tests for the changes and scenario tests if relevant?
  • No
• Did you add public API?
  • No
• Does the change make any security assumptions or guarantees?
  • No
• Does the change require an update in our Aspire docs?
  • No

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 12637

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 12637"

[Copilot]

Pull Request Overview

This PR adds code signing configuration for three new ModelContextProtocol library DLLs as third-party dependencies. The changes ensure these assemblies will be properly signed during the build process using the standard 3PartySHA2 certificate.

Key Changes

• Added signing entries for three ModelContextProtocol assemblies (Core, AspNetCore, and the main library)

[joperezr]

/backport to release/13.0

[github-actions]

Started backporting to release/13.0: https://github.com/dotnet/aspire/actions/runs/19049909480

[radical]

Manually run the pipeline