refactor: improve code comments for readability and consistency

[ogrew]

Summary

Comprehensive improvement of code comments across the entire visp codebase to enhance readability and consistency.

Changes Made

Comment Language Standardization

• Converted all Japanese comments to English for international accessibility
• Ensures consistent language throughout the codebase
• Makes the project more welcoming to international contributors

Comment Quality Improvements

• Removed redundant comments that simply repeat what the code clearly expresses
• Eliminated unnecessary type annotations in struct field definitions (e.g., ;boolean, ;float)
• Improved comment clarity with more descriptive and concise explanations
• Standardized comment style across all source files

Code Cleanup

• Removed unused constant +flip-filters+ that was never referenced in the codebase
• Cleaned up inconsistent formatting in comment blocks
• Improved visual consistency throughout the codebase

Files Modified

• src/main.lisp - Mode-specific comments and workflow descriptions
• src/options.lisp - Struct definitions and option parsing
• src/validate.lisp - Input validation and error checking
• src/ffmpeg.lisp - Command building and execution
• src/util.lisp - Utility function descriptions
• src/video.lisp - Video metadata handling
• src/log.lisp - Logging utility cleanup
• src/help.lisp - Help text section markers
• src/const.lisp - Constant definitions and unused code removal

Benefits

• Better readability for international contributors
• Reduced visual noise from redundant comments
• Consistent English-only comment style throughout codebase
• Cleaner and more maintainable code structure
• Improved development experience with clearer code documentation

Test plan

• Verify all existing functionality works unchanged
• Confirm build process succeeds: ros build visp.ros
• Run test suite: make test
• Check that no functional behavior has changed

This is a pure refactoring change that improves code quality without affecting functionality.

🤖 Generated with Claude Code