Remove Microsoft.ML.GenAI.* packages and their supporting code

[rosebyte]

Fixes #7720

Remove the Microsoft.ML.GenAI.* packages and everything used exclusively to support them.

• Delete the Core, LLaMA, Mistral and Phi libraries, their test projects, model configurations, approval baselines and samples.
• Remove all nine associated projects from the solution.
• Remove ten GenAI-only NuGet dependencies and their unused version properties, including AutoGen, Semantic Kernel, Microsoft.Extensions.AI.Abstractions, TorchSharp.PyBridge and Moq.
• Delete the GenAI design documentation and the obsolete PyBridge third-party notice.
• Update the documentation index, package dependency diagram, Copilot instructions and issue-triage guidance.

[Copilot]

🟡 Changes recommended

The cleanup removes the central CUDA package version and documented test-project switch even though the remaining TorchSharp GPU test still depends on them.

Get a fresh assessment by requesting another Copilot review.

Pull request overview

Removes the retired Microsoft.ML.GenAI.* packages and their exclusive implementation, tests, samples, documentation, and dependencies.

Changes:

• Deletes GenAI Core, LLaMA, Mistral, and Phi code and tests.
• Removes GenAI-specific package versions, dependencies, notices, and documentation.
• Updates repository documentation and tooling guidance.

File summaries

File	Description
THIRD-PARTY-NOTICES.TXT	Removes the PyBridge notice.
test/Microsoft.ML.TorchSharp.Tests/Microsoft.ML.TorchSharp.Tests.csproj	Removes the commented CUDA package switch.
test/Microsoft.ML.GenAI.Phi.Tests/*	Deletes Phi test projects, tests, and approval baselines.
test/Microsoft.ML.GenAI.Mistral.Tests/*	Deletes Mistral tests and approval baselines.
test/Microsoft.ML.GenAI.LLaMA.Tests/*	Deletes LLaMA tests and approval baselines.
test/Microsoft.ML.GenAI.Core.Tests/*	Deletes GenAI Core tests and project configuration.
src/Microsoft.ML.GenAI.Phi/*	Deletes Phi implementations, configurations, resources, and project metadata.
src/Microsoft.ML.GenAI.Mistral/*	Deletes Mistral implementations, configuration, resources, and project metadata.
src/Microsoft.ML.GenAI.LLaMA/*	Deletes LLaMA implementations, configurations, resources, and project metadata.
src/Microsoft.ML.GenAI.Core/*	Deletes shared GenAI pipeline, model, training, quantization, and utility code.
eng/Versions.props	Removes unused GenAI dependency versions.
Directory.Packages.props	Removes GenAI-only package version entries.
docs/samples/Microsoft.ML.GenAI.Samples/*	Deletes GenAI samples and project configuration.
docs/README.md	Removes the GenAI documentation link.
docs/project-docs/components-and-dependencies.md	Removes GenAI dependency diagram entries.
docs/gen-ai/*	Deletes GenAI design documentation.
.github/workflows/issue-triage.agent.md	Replaces GenAI area guidance with TorchSharp trainer guidance.
.github/copilot-instructions.md	Removes obsolete GenAI repository references.

Review details

• Files reviewed: 146/146 changed files
• Comments generated: 2
• Review effort level: Lite

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