v0.6.0-rc12: Enhanced Testing Infrastructure

What's New

✨ Features

• Added ToCommandString() method to CommandResult for debugging command construction

🧪 Testing Improvements

• Refactored ALL command builder tests to verify actual command strings
• Tests now validate exact command construction instead of just checking for non-null builders
• Added comprehensive command string verification across:
  • All 16 DotNet command builders
  • Gwq command builder (25 tests)
  • Ghq command builder (20 tests)
  • Fzf command builder (25 tests)
  • Shell.Run builder (20 tests)

📝 Benefits

• Real validation of command construction
• Better documentation of expected command formats
• Improved regression protection
• Enhanced debugging capabilities when commands fail

This release significantly improves test quality by transforming "null-check only" tests into meaningful command verification tests.