Split the 1,600-line StringExtensions.cs into logical categories: - StringExtensions.Culture.cs - invariant comparison methods - StringExtensions.Manipulation.cs - string modification methods - StringExtensions.Encoding.cs - hashing, base64, guid encoding - StringExtensions.Parsing.cs - parsing and detection methods - StringExtensions.Sanitization.cs - XSS, HTML, file path methods No functional changes. All existing tests pass. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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