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Add comprehensive MD053 rule to detect unused and duplicate link/image reference definitions. Features: - Detects unused reference definitions - Identifies duplicate definitions (first definition wins per CommonMark) - Supports all reference formats: full [text][label], collapsed [label][], shortcut [label] - CommonMark compliant label normalization (case-insensitive, whitespace collapse) - Configurable ignored definitions with sensible defaults (["//"] for comments) - Performance optimized with pre-compiled regex patterns and HashMap lookups Implementation: - Document-wide rule type for comprehensive analysis - 13 comprehensive unit tests covering all scenarios and edge cases - Proper integration with configuration system and CLI - Complete documentation and test sample files - Code formatting improvements across multiple files 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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Add comprehensive MD053 rule to detect unused and duplicate link/image reference definitions.
Features:
Implementation:
🤖 Generated with Claude Code