[main] Source code updates from dotnet/arcade

[dotnet-maestro]

Note

This is a codeflow update. It may contain both source code changes from
the source repo
as well as dependency updates. Learn more here.

This pull request brings the following source code changes

From https://github.com/dotnet/arcade

• Subscription: ab0d56ad-2ca6-45b9-98fc-393e964e843f
• Build: 20260929.3 (334368)
• Date Produced: September 29, 2026 1:29:43 PM UTC
• Commit: 2e48b7dec08004636dc4dd0c58ca40711d5d5834
• Commit Diff: 6a8efa5...2e48b7d
• Branch: main

Diff the source with this PR branch

darc vmr diff --name-only https://github.com/dotnet/arcade:2e48b7dec08004636dc4dd0c58ca40711d5d5834..https://github.com/dotnet/dotnet:darc-main-39c1022c-5d2f-4cfe-8798-d68dc97e61d6

[dotnet-maestro]

Note

PRs from original repository included in this codeflow update:

• Refactor targeting pack properties for unknown frameworks arcade#17627
• Update mcr.microsoft.com/dotnet-buildtools/prereqs Docker tag to v44 arcade#17626
• Use GPT-5.5 for Build Failure Analysis model defaults arcade#17632
• [main] Update dependencies from dotnet/arcade, dotnet/dnceng arcade#17598
• Bump MSBuild.ProjectCreation from 10.0.0 to 19.1.4 arcade#17582
• Bump Microsoft.Diagnostics.NETCore.Client from 0.2.746301 to 0.2.746701 arcade#17579
• Bump Microsoft.Identity.Client from 4.89.0 to 4.90.0 arcade#17580
• Bump Microsoft.VisualStudioEng.MicroBuild.Plugins.SwixBuild from 1.1.922 to 1.1.973 arcade#17581
• [main] Update dependencies from dotnet/xharness arcade#17549
• [main] Update dependencies from dotnet/arcade arcade#17633

💡 You may consult the FAQ for more information or tag @dotnet/prodconsvcs for assistance.

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[maestro-approver]

This pull request contains only source updates from https://github.com/dotnet/arcade.

• Commit Diff: 6a8efa5...2e48b7d