Add MethodInfo.CreateDelegate<TDelegate> polyfills

[Copilot]

.NET 5 introduced generic overloads for MethodInfo.CreateDelegate<TDelegate>() and MethodInfo.CreateDelegate<TDelegate>(object?), which were missing from the polyfill set.

Polyfill

• Added PolyShim/Net50/MethodInfo.cs with extension members CreateDelegate<TDelegate>() and CreateDelegate<TDelegate>(object? target) on MethodInfo, constrained to where TDelegate : Delegate.
• Delegates to the instance CreateDelegate(Type[, object]) methods on frameworks that support them, and falls back to the static Delegate.CreateDelegate overloads on .NET Framework versions prior to 4.5, which lack the instance methods.

Tests

• Added PolyShim.Tests/Net50/MethodInfoTests.cs covering both the parameterless and the object-target overloads.

Docs

• Regenerated Signatures.md to include the new MethodInfo entries.

var method = typeof(Math).GetMethod(nameof(Math.Max), [typeof(int), typeof(int)])!;
var max = method.CreateDelegate<Func<int, int, int>>();
max(2, 3); // 3

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.71%. Comparing base (8af065d) to head (a1ebe73).
⚠️ Report is 1 commits behind head on prime.

Additional details and impacted files

@@            Coverage Diff             @@
##            prime     #144      +/-   ##
==========================================
+ Coverage   87.65%   87.71%   +0.05%     
==========================================
  Files         339      341       +2     
  Lines        7389     7406      +17     
  Branches      539      539              
==========================================
+ Hits         6477     6496      +19     
+ Misses        744      742       -2     
  Partials      168      168              

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[Copilot]

Copilot review overview

🟡 Changes recommended

The tests lack the namespace import required to compile against the polyfill on net472.

Review effort: Balanced
Findings: 1

Open (1)

• Import System.Reflection for net472 extension methods · New

What changed in this PR

Adds .NET 5 generic MethodInfo.CreateDelegate<TDelegate> polyfills for older targets.

Changes:

• Implements both generic delegate-creation overloads.
• Adds tests and updates generated signatures.

File	Description
Signatures.md	Documents the new members.
PolyShim/​Net50/​MethodInfo.cs	Implements the polyfills.
PolyShim.Tests/​Net50/​MethodInfoTests.cs	Tests both overloads.

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[Tyrrrz]

@copilot remove namespace declarations from both polyfill files. They should not need a using directive to use. Update the test file accordingly.

[Copilot]

@copilot remove namespace declarations from both polyfill files. They should not need a using directive to use. Update the test file accordingly.

Removed the namespace declarations, added the source-level reflection imports needed to resolve MethodInfo, and removed using System.Reflection from the test file in a1ebe73.