Apply template updates: Polyfill, netstandard2.0, and net481 Windows test evidence#120

Merged

Malcolmnixon merged 10 commits intomainfrom

copilot/update-template-project

Feb 28, 2026

Commits on Feb 28, 2026

Initial plan
Copilot
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Apply TemplateDotNetLibrary updates: Polyfill, LangVersion=latest, netstandard2.0 support
Copilot
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Add net481 Windows test target and update REQ-PLAT-004 to use net481 evidence

Copilot
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Malcolmnixon
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Simplify System.Text.Json to single version and restore lowercase GenerateDocumentationFile

Copilot
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Malcolmnixon
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Restore GenerateDocumentationFile to lowercase true in library project

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Malcolmnixon
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Replace HashCodePolyfill with Microsoft.Bcl.HashCode 6.0.0; fix spell-check failures

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Malcolmnixon
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Fix net481 build: guard ReplaceLineEndings behind NET6_0_OR_GREATER in TestHelpers.cs

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Malcolmnixon
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Use library's Polyfill via global using Polyfills; instead of #if guard in TestHelpers.cs

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Malcolmnixon
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Fix ArgumentException message assertions to be portable across .NET Framework and modern .NET

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Malcolmnixon
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Replace Assert.IsTrue(x.StartsWith) antipattern with Assert.StartsWith

Copilot
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Malcolmnixon
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