Merge latest Library.Template

[AArnott]

• Drop auto-insertion tag handling
• Update actions/checkout digest to 93cb6ef
• Replace hard-coded codecov_token with secrets/variables
• Update actions/checkout action to v6 (443)
• Use official URLs in Install-DotNetSdk.ps1
• Update dependency xunit.v3 to 3.2.1 (445)
• Switch out our own OptProf profiling pipeline for the VS one
• Merge pull request 447 to Build on newer agents
• Update actions/checkout digest to 8e8c483 (448)
• Update actions/checkout digest
• Build on VS2026 agents
• Better pinning of GitHub Actions
• Update actions/checkout action to v6.0.1 (449)
• Exclude vs-insertion-script.ps1 from signing requirement
• Update actions/deploy-pages action to v4.0.5 (450)
• Skip SBOM generation for the vs-insertion pipeline
• Remove stray backtick from README
• Update NuGet/login action to v1.1.0 (451)
• Remove vs-threading specific change
• Remove stale comment
• Update actions/checkout action to v6.0.1
• Fix alignment of sbom parameter
• Fix template expansion
• Opt into Microsoft Testing Platform (MTP) (#452)
• Push to nuget.org before pushing to github release
• Update to MTP v2 (#455)
• Update all MTP related packages at once (457)
• Fix test result publishing to AzDO (458)
• Update .NET SDK to v10.0.101 (#459)
• Drop package dependencies that MTP does not require
• Fix MTP test failure for MTP-incompatible projects under the test folder
• Fix testing regression from last commit
• Adjust how we use IsTestProject
• Expand applicability of extra args in dotnet-test-cloud.ps1
• Update becheran/mlc action to v1.1.0 (461)
• Update GitHub Artifact Actions (462)
• Update becheran/mlc action to v1.2.0 (463)
• Preserve exit codes better and organize switches
• Skip native binary PDB conversion
• Fix case sensitivity in dotnet-test-cloud
• Bump code coverage package/tool
• Update becheran/mlc action to v1.2.0
• Update dependency Microsoft.Testing.Extensions.CodeCoverage to 18.3.2
• Update dependency dotnet-coverage to v18.3.2 (465)
• Merge pull request 469 from AArnott/copilot/port-change-to-library-template
• Fix copilot instructions regarding test project suffix
• Update .NET SDK to v10.0.102 (471)
• Fix FailsInCloudTest filter after MTPv2 migration
• Update dependency xunit.v3.mtp-v2 to 3.2.2 (472)
• Update actions/checkout action to v6.0.2 (#473)
• Update Microsoft Testing Platform (475)
• Update dependency dotnet-coverage to v18.4.1 (474)
• Update mcr.microsoft.com/dotnet/sdk:10.0.102 Docker digest to 6ba533c (476)
• Add Copilot prompt to automate Library.Template updates
• Fix test filter
• Update actions/checkout action to v6.0.2
• Improve library.template merge AI prompt
• Update Dockerfile and global.json updates to v10.0.103 (477)
• Explain how to migrate sln to slnx
• Update mcr.microsoft.com/dotnet/sdk:10.0.103 Docker digest to 0a506ab (478)
• Update dependency nerdbank.dotnetrepotools to v1.1.1 (479)
• Use forward slash in md files
• Touch-up custom prompt
• Update network isolation policy
• Only disable NBGV_GitEngine when necessary

[Copilot]

Pull request overview

Updates this repository to the latest Library.Template, modernizing CI/CD, test infrastructure, and build tooling to align with current template practices.

Changes:

• Migrates test infrastructure toward Microsoft.Testing.Platform (MTP v2) + xunit v3 and adjusts test/coverage artifact collection.
• Updates Azure Pipelines and GitHub Actions agent pools, action pins, and related build/release/insertion workflows.
• Refreshes tooling/dependencies (global.json SDK bump, dotnet tools, central package versions) and removes legacy OptProf/VSInsertionMetadata plumbing.

Reviewed changes

Copilot reviewed 45 out of 45 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tools/variables/ProfilingInputsPropsName.ps1	New helper to compute OptProf profiling props filename for CI.
tools/dotnet-test-cloud.ps1	Updates test execution to support MTP/vstest split, logs, and exit code handling.
tools/artifacts/testResults.ps1	Adjusts repo root/test results pathing.
tools/artifacts/coverageResults.ps1	Updates coverage discovery to include MTP output locations and token substitution.
tools/artifacts/VSInsertion.ps1	Updates VS insertion artifact composition (adds insertion script + props artifact).
tools/Prepare-Legacy-Symbols.ps1	Skips legacy PDB conversion for native binaries.
tools/Install-DotNetSdk.ps1	Switches to official builds.dotnet.microsoft.com endpoints.
test/Microsoft.VisualStudio.Sdk.TestFramework.Xunit.v3.Tests/Microsoft.VisualStudio.Sdk.TestFramework.Xunit.v3.Tests.csproj	Opts into MTP dotnet-test support and updates xunit v3 runner package reference.
test/Microsoft.VisualStudio.Sdk.TestFramework.Xunit.Tests/Microsoft.VisualStudio.Sdk.TestFramework.Xunit.Tests.csproj	Adjusts MTP application setting for compatibility with mixed runners.
test/Directory.Build.targets	Adds MTP extensions and overrides MTP/VSTest interop behavior for .NET 10+.
test/Directory.Build.props	Enables UseMicrosoftTestingPlatformRunner for test projects.
src/VSInsertionMetadata/VSInsertionMetadata.targets	Removes legacy VS insertion metadata packaging targets.
src/VSInsertionMetadata/ProfilingInputs.props	Removes legacy profiling inputs props template file.
src/VSInsertionMetadata/Library.VSInsertionMetadata.proj	Removes legacy VS insertion metadata project.
src/OptProf.targets	Updates OptProf scenario configuration (removes VS repo-specific container metadata).
global.json	Updates .NET SDK version to 10.0.103.
azure-pipelines/vs-validation.yml	Updates pool/policy settings and adjusts insertion custom script command.
azure-pipelines/vs-insertion.yml	Drops auto-insertion tag behavior, updates pools/policies, and adds insertion custom script.
azure-pipelines/vs-insertion-script.ps1	New script to copy OptProf-related props into the VS repo insertion PR.
azure-pipelines/unofficial.yml	Updates pools/policies and exclusions for signing validation.
azure-pipelines/schedule-only-steps.yml	Removes auto-insertion tagging step.
azure-pipelines/release.yml	Updates pools/policies for release pipeline.
azure-pipelines/prepare-insertion-stages.yml	Updates pool for insertion prep stages.
azure-pipelines/official.yml	Updates pools/policies and signing validation exclusions.
azure-pipelines/microbuild.before.yml	Removes OptProf plugin setup path and simplifies component governance step conditions.
azure-pipelines/microbuild.after.yml	Removes OptProf-specific artifact publishing steps.
azure-pipelines/libtemplate-update.yml	Updates network isolation policy setting.
azure-pipelines/dotnet.yml	Simplifies test invocation, updates Codecov token usage, and adjusts conditions.
azure-pipelines/build.yml	Updates default agent images and switches OptProf configuration to VS-provided pipeline/props flow.
azure-pipelines/archive-sourcecode.yml	Updates pools/policies for source archive pipeline.
azure-pipelines/OptProf_part2.yml	Removes legacy OptProf part2 pipeline.
azure-pipelines/OptProf.yml	Removes legacy OptProf pipeline.
azure-pipelines/Merge-CodeCoverage.ps1	Adds verbose logging during coverage merge normalization.
azure-pipelines/BuildStageVariables.yml	Removes hard-coded Codecov token from variables.
Directory.Packages.props	Updates central package versions and introduces MTP-related package/version properties.
.github/workflows/libtemplate-update.yml	Updates actions/checkout pin to v6.0.2 digest.
.github/workflows/docs_validate.yml	Updates actions/checkout pin and Markup Link Checker (mlc) pin.
.github/workflows/docs.yml	Updates actions/checkout pin and deploy-pages version comment/pin.
.github/workflows/copilot-setup-steps.yml	Updates actions/checkout pin to v6.0.2 digest.
.github/prompts/update-library-template.prompt.md	Adds a reusable prompt describing how to merge Library.Template updates.
.github/prompts/template-release-notes.md	Adds template release notes to guide future merges (e.g., sln→slnx guidance).
.github/copilot-instructions.md	Updates Copilot guidance (Prime-ForCopilot + MTP/xunit v3 filtering guidance).
.github/actions/publish-artifacts/action.yaml	Updates upload-artifact pins to v7.0.0 digest.
.github/Prime-ForCopilot.ps1	New helper to disable NBGV Git engine only when shallow-cloned.
.config/dotnet-tools.json	Updates dotnet tool versions (dotnet-coverage, docfx, nerdbank.dotnetrepotools).

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