feat: implement MD013 line-length rule with comprehensive architectur…

[ekropotin]

feat: implement MD013 line-length rule with comprehensive architecture enchantments

Major changes:

• Implemented MD013 (line-length) rule with configurable limits and exceptions
• Enhanced architecture with single-pass document processing and context caching
• Added comprehensive rules implementation checklist (48 total markdownlint rules)
• Categorized rules into 5 implementation types for optimal development strategy

Key architectural improvements:

• Enhanced Context system with line caching and node-to-line mapping
• Hybrid AST + line processing for optimal performance
• Document-wide state preparation for complex rules
• Single-use contract enforcement for memory safety

Code quality improvements:

• Fixed clippy warnings (or_default, format string inlining)
• Suppressed false-positive recursive parameter warnings
• Added comprehensive documentation and usage examples

Test coverage:

• 75 total tests passing
• Comprehensive MD013 test suite with multiple configuration modes
• Integration tests for CLI error reporting

Documentation:

• Added MD013 rule documentation following project conventions
• Updated CLAUDE.md with complete rules roadmap and architecture analysis

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