Fix plugin-path, test lib header search

[aelam]

Pull Request Description

Summary

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🧹 Code cleanup/refactoring
• 🔧 Build/CI changes

Changes Made

• Fix plugin-path
• Fix -L --> -I for TEST_LIBRARY_SEARCH_PATHS

Related Issues

Testing

• New tests added for new functionality
• All existing tests pass
• Manual testing completed

Screenshots/Recordings

Checklist

• Code follows the project's style guidelines
• Self-review of the code has been performed
• Code has been commented, particularly in hard-to-understand areas
• Corresponding documentation has been updated
• Changes generate no new warnings
• Any dependent changes have been merged and published

Additional Notes

[codecov]

Codecov Report

❌ Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 37.27%. Comparing base (ff37279) to head (d198367).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...Providers/SearchPaths/TestSearchPathProvider.swift	95.65%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #89      +/-   ##
==========================================
+ Coverage   37.01%   37.27%   +0.25%     
==========================================
  Files         113      113              
  Lines        5722     5747      +25     
==========================================
+ Hits         2118     2142      +24     
- Misses       3604     3605       +1     

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