Add Directory.CreateForFile extension method

[Copilot]

Adds a static extension method on Directory that creates the directory tree needed for a given file path.

Changes

• DirectoryExtensions.cs — new Directory.CreateForFile(string filePath) method; extracts the directory component via Path.GetDirectoryName and delegates to Directory.CreateDirectory, creating all intermediate directories. No-ops if the path has no directory component.
• DirectoryExtensionsTests.cs — two new tests covering a flat path and a deeply nested path.

Usage

// Ensures /some/nested/dir/ exists before writing
Directory.CreateForFile("/some/nested/dir/file.txt");
File.WriteAllText("/some/nested/dir/file.txt", content);

[Copilot]

Pull request overview

Adds a Directory.CreateForFile(string filePath) extension to ensure the parent directory tree exists for a given file path, aligning with PowerKit’s IO helper extensions and enabling safer “create dirs then write file” workflows.

Changes:

• Added Directory.CreateForFile(string filePath) that creates the directory component of a file path (no-op if none).
• Added tests intended to cover flat and nested file paths.

Reviewed changes

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

File	Description
PowerKit/Extensions/DirectoryExtensions.cs	Introduces CreateForFile() extension that derives the directory via Path.GetDirectoryName() and creates it.
PowerKit.Tests/Extensions/DirectoryExtensionsTests.cs	Adds tests for CreateForFile() behavior (currently one test doesn’t validate the intended behavior).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.88%. Comparing base (45628b8) to head (18be28c).
⚠️ Report is 1 commits behind head on prime.

Additional details and impacted files

@@            Coverage Diff             @@
##            prime      #72      +/-   ##
==========================================
+ Coverage   93.85%   93.88%   +0.02%     
==========================================
  Files         128      128              
  Lines        2524     2534      +10     
  Branches      200      201       +1     
==========================================
+ Hits         2369     2379      +10     
  Misses        112      112              
  Partials       43       43              

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