fix(docs): keep documentation generation native

[PrzemyslawKlys]

Summary

• remove the legacy documentation provider surface so PowerForge uses only the built-in documentation engine
• drop the hidden New-ConfigurationDocumentation -Tool parameter and schema/config DocumentationTool entries
• fix native help extraction for commands with parameters named Keys by enumerating dictionary entries explicitly
• refresh current docs/help text so the removed provider knob is no longer advertised

Validation

• dotnet build .\PSPublishModule.sln -c Release --nologo
• dotnet test .\PowerForge.Tests\PowerForge.Tests.csproj -c Release --filter "FullyQualifiedName~Documentation" --nologo
• imported PSPublishModule\bin\Release\net8.0\PSPublishModule.dll and confirmed New-ConfigurationDocumentation no longer exposes Tool
• parsed updated schema JSON files with ConvertFrom-Json

[chatgpt-codex-connector]

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