Fix CI validation and publish desktop artifacts

[KSemenenko]

Summary

• replace the old msbuild-based workflow with dotnet-native quality, unit, coverage, and UI checks
• make the browser UI suite runnable without external driver setup and fix the browserwasm build blocker
• publish desktop app artifacts for macOS, Windows, and Linux from GitHub Actions and document the enforced CI contract

Verification

• dotnet format DotPilot.slnx --verify-no-changes
• dotnet build DotPilot.slnx
• dotnet build DotPilot.slnx -warnaserror
• dotnet test DotPilot.Tests/DotPilot.Tests.csproj
• dotnet test DotPilot.Tests/DotPilot.Tests.csproj --settings DotPilot.Tests/coverlet.runsettings --collect:"XPlat Code Coverage"
• dotnet test DotPilot.UITests/DotPilot.UITests.csproj
• dotnet test DotPilot.slnx
• dotnet publish DotPilot/DotPilot.csproj -c Release -f net10.0-desktop

[Copilot]

Pull request overview

This PR replaces the old msbuild-based CI workflow with dotnet-native commands, makes the browser UI test suite runnable without manual driver setup by auto-downloading ChromeDriver, and adds desktop artifact publishing for macOS, Windows, and Linux.

Changes:

• Replaced msbuild CI jobs with dotnet build/test/publish commands, added quality, unit, coverage, UI test, and desktop artifact jobs
• Implemented automatic ChromeDriver download and caching in BrowserAutomationBootstrap so UI tests run without manual UNO_UITEST_DRIVER_PATH setup
• Updated package versions, coverage runsettings, governance docs, and architecture docs to reflect the new CI contract

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
.github/workflows/ci.yml	Replaced msbuild jobs with dotnet-native quality/test/coverage/UI/desktop-artifact jobs
.github/steps/install_dependencies/action.yml	Switched to setup-dotnet@v4 with global-json-file instead of explicit version
DotPilot.UITests/BrowserAutomationBootstrap.cs	Added automatic ChromeDriver download, version detection, and caching
DotPilot.UITests/TestBase.cs	Added explicit --window-size selenium argument, always pass driver path
DotPilot.UITests/BrowserAutomationBootstrapTests.cs	Added environment save/restore in setup/teardown, updated test for non-null driver path
DotPilot/Services/Endpoints/DebugHandler.cs	Refactored to avoid warnings: #if DEBUG around logger field
Directory.Packages.props	Bumped coverlet, NUnit, test SDK, adapter, and logger versions
global.json	Pinned SDK version to 10.0.103
DotPilot.Tests/coverlet.runsettings	New runsettings to scope coverage and exclude generated artifacts
AGENTS.md, DotPilot/AGENTS.md, DotPilot.Tests/AGENTS.md, DotPilot.UITests/AGENTS.md	Updated governance docs for new CI contract and terminology
docs/Architecture.md	Updated architecture docs for CI artifacts and UI test terminology
ui-tests-mandatory.plan.md, ci-pr-validation.plan.md	Task planning documents

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[Copilot]

In Release builds, the logger parameter is validated via ThrowIfNull but never stored or used, which will produce a compiler warning (CS9113 or similar for unused parameter, or in this case the local is simply discarded). Consider suppressing the warning explicitly or restructuring so the parameter isn't accepted at all in Release, to avoid confusion for future maintainers.

Suggested change

	_logger = logger;
	_logger = logger;
	#else
	_ = logger;

[Copilot]

The desktop_artifacts job only runs actions/setup-dotnet but skips the shared install_dependencies composite action that the other jobs use. That action also runs uno-check to install Uno Platform workloads, which are likely required for dotnet publish with net10.0-desktop. Without workloads installed, this job may fail on CI. Consider using the shared install_dependencies action here as well, or at minimum adding a workload install step.