[DNM] PythonNet Test

[zeusongit]

Purpose

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• Is documented according to the standards
• The level of testing this PR includes is appropriate
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.

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[Copilot]

Pull Request Overview

This pull request migrates Python node functionality from CPython3 to PythonNet3 engine within Dynamo. The change switches the default Python engine to PythonNet3, removes the legacy DSCPython library, and adds comprehensive user notification systems for the engine transition.

Key changes include:

• Replacing CPython3 engine references with PythonNet3 throughout the codebase
• Implementing user notifications for automatic engine upgrades
• Updating test files to use PythonNet3 engine instead of CPython3

Reviewed Changes

Copilot reviewed 83 out of 96 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/core/python/*.dyn	Updated Python test graphs to use PythonNet3 engine
test/Libraries/DynamoPythonTests/*.cs	Migrated test code from DSCPython to DSPythonNet3 evaluator
src/Libraries/DSCPython/	Removed entire legacy CPython library implementation
src/DynamoCoreWpf/Views/Menu/PreferencesView.xaml	Updated preferences UI for PythonNet3 engine reset
src/PythonMigrationViewExtension/	Enhanced migration extension with CPython upgrade notifications
src/Libraries/PythonNodeModels/PythonNode.cs	Changed default engine from CPython3 to PythonNet3
src/DynamoCore/Configuration/PreferenceSettings.cs	Added setting to hide CPython upgrade notifications

Files not reviewed (4)

• src/DynamoCoreWpf/Properties/Resources.Designer.cs: Language not supported
• src/Libraries/DSCPython/Properties/Resources.Designer.cs: Language not supported
• src/Libraries/PythonNodeModels/Properties/Resources.Designer.cs: Language not supported
• src/PythonMigrationViewExtension/Properties/Resources.Designer.cs: Language not supported

Comments suppressed due to low confidence (3)

test/Libraries/DynamoPythonTests/PythonEvalTestsWithLibraries.cs:1

• [nitpick] The comment provides good context for the test quarantine, but could be more specific about the expected timeline for the "parity fix" or reference a tracking issue/ticket for resolution.
  test/Libraries/DynamoPythonTests/PythonEditTests.cs:1
• [nitpick] Similar to the previous comment, this quarantine explanation would benefit from more specific details about the expected exception shape differences or a reference to a tracking issue for the parity fix.
  test/core/packageDependencyTests/PythonDependency.dyn:1
• The Python dependency test should verify that the engine change from CPython3 to PythonNet3 doesn't break package dependency resolution, but the test file only shows the engine property change without corresponding test logic validation.

[Copilot]

The analytics package version was downgraded from 4.2.2.10200 to 4.2.1.9358. This appears to be unintentional and could indicate a dependency conflict that should be investigated.

Suggested change

	<PackageReference Include="DynamoVisualProgramming.Analytics" Version="4.2.1.9358" />
	<PackageReference Include="DynamoVisualProgramming.Analytics" Version="4.2.2.10200" />