Add ICollection.AddRange and ICollection.RemoveRange extension methods

[Copilot]

Extends CollectionExtensions with two new methods on ICollection<T> — AddRange and RemoveRange — mirroring the CliFx reference implementation.

Changes

• CollectionExtensions — adds two methods to the existing extension<T>(ICollection<T>) block:
  • AddRange(IEnumerable<T> items) — iterates and calls Add for each element
  • RemoveRange(IEnumerable<T> items) — iterates and calls Remove for each element
• CollectionExtensionsTests — adds AddRange_Test and RemoveRange_Test

Usage

var collection = (ICollection<int>)new List<int> { 1, 2, 3 };

collection.AddRange([4, 5, 6]);
// collection == [1, 2, 3, 4, 5, 6]

collection.RemoveRange([2, 4]);
// collection == [1, 3, 5, 6]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.54%. Comparing base (667c235) to head (63d8ea6).
⚠️ Report is 2 commits behind head on prime.

Additional details and impacted files

@@            Coverage Diff             @@
##            prime      #39      +/-   ##
==========================================
+ Coverage   94.47%   94.54%   +0.07%     
==========================================
  Files          76       76              
  Lines        1574     1596      +22     
  Branches      131      133       +2     
==========================================
+ Hits         1487     1509      +22     
  Misses         65       65              
  Partials       22       22              

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[Copilot]

Pull request overview

This PR extends PowerKit.Extensions.CollectionExtensions with ICollection<T> helpers to add or remove multiple items in one call, aligning the library’s collection utility surface with the referenced CliFx-style API.

Changes:

• Add ICollection<T>.AddRange(IEnumerable<T>) extension method.
• Add ICollection<T>.RemoveRange(IEnumerable<T>) extension method.
• Add unit tests for AddRange and RemoveRange.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
PowerKit/Extensions/CollectionExtensions.cs	Adds AddRange/RemoveRange extensions on ICollection<T> alongside existing collection helpers.
PowerKit.Tests/CollectionExtensionsTests.cs	Adds happy-path tests covering the new AddRange/RemoveRange methods.

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