Runtime async#62

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TheAngryByrd wants to merge 15 commits intomasterfrom

Commits on Nov 20, 2025

Update Directory.Build.props to support .NET 6.0, 9.0, and 10.0; adjust global.json SDK version
TheAngryByrd
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Refactor AsyncHelpers and TaskTests to improve resource disposal and stack trace checks
TheAngryByrd
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Enhance benchmarks for .NET compatibility and add support for multiple target frameworks
TheAngryByrd
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Commits on Nov 21, 2025

Add ILSpySamples-CSharp project and update ILSpySamples to support multiple target frameworks
TheAngryByrd
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Use unsafe casting hack to make runtime async compatible IL
TheAngryByrd
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