Add polyfills for Task.FromResult(...) and Task.CompletedTask

[Tyrrrz]

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[Copilot]

Pull Request Overview

This PR adds polyfills for Task.FromResult<T>(...) and Task.CompletedTask to support older .NET Framework and .NET Standard versions that lack these APIs.

• Introduces Task.CompletedTask polyfill for .NET Framework < 4.6 and .NET Standard < 1.3
• Adds Task.FromResult<T>() polyfill for .NET Framework 4.0-4.4
• Uses conditional compilation to target specific framework versions

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[Copilot]

Pull Request Overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 2 comments.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (a51d451) to head (54bf24e).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@     Coverage Diff      @@
##   master   #30   +/-   ##
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[Copilot]

Pull Request Overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

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