Comprehensive design for splitting the 1,600-line StringExtensions.cs
into 5 focused partial class files with performance optimizations.
Key decisions:
- Partial class approach to prevent breaking changes
- 5 files: Culture, Manipulation, Encoding, Parsing, Sanitization
- Performance fixes for regex caching and char operations
- 4-phase implementation with individual plans and summaries
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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