fix(file_operations): convert MSYS paths to Windows paths on Windows

[Embracex1998]

On Windows with MSYS/Git-Bash, the shell returns paths like /c/Users/... and /d/code/... but Python expects C:/Users/... and D:/code/...

This caused write_file to write files to the wrong location - files appeared to exist when checked via Python but were not visible in Windows Explorer or to terminal commands using Windows paths.

The fix adds a _msys_to_windows_path() method that converts MSYS-style drive paths (/c/, /d/, etc.) to Windows-style paths (C:/, D:/, etc.)

Fixes NousResearch#37144

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• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 🔒 Security fix
• 📝 Documentation update
• ✅ Tests (adding or improving test coverage)
• ♻️ Refactor (no behavior change)
• 🎯 New skill (bundled or hub)

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