Add script to make $break, $continue, $any variables constexpr

[konard]

Summary

This PR addresses issue #23 by providing a script that automatically converts auto variable declarations to static constexpr for $break, $continue, and any variables in C++ codebases.

Changes Made

• ✅ Created make_constexpr.sh - A robust script that processes C++ files and converts specific variable patterns
• ✅ Added comprehensive documentation in README_make_constexpr.md
• ✅ Included test files demonstrating the conversion patterns
• ✅ Verified functionality with sample C++ code

Supported Conversions

The script converts these patterns:

• auto $break = Constants.Break; → static constexpr auto $break = Constants.Break;
• auto $continue = Constants.Continue; → static constexpr auto $continue = Constants.Continue;
• auto any = Constants.Any; → static constexpr auto any = Constants.Any;
• auto $break {Constants.Break}; → static constexpr auto $break {Constants.Break};
• auto $continue {Constants.Continue}; → static constexpr auto $continue {Constants.Continue};
• auto any {Constants.Any}; → static constexpr auto any {Constants.Any};

Usage

# Process current directory
./make_constexpr.sh

# Process specific directory  
./make_constexpr.sh /path/to/cpp/project

Safety Features

• Only modifies exact pattern matches to avoid unintended changes
• Preserves original indentation and formatting
• Reports which files were modified
• Safe to run multiple times (idempotent)

Test Results

Tested on sample files with various patterns - all conversions work correctly while preserving other auto declarations.

🤖 Generated with Claude Code

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Resolves #23