## Features Added
### Core diff-and-compare implementation:
- Complete rewrite of src/tydra/diff-and-compare.cc with full diff algorithm
- Hierarchical PrimSpec comparison (added/deleted/modified primitives)
- Property comparison for attributes and relationships
- Recursive traversal with depth limits for security
- Memory-safe implementation using standard containers
### Text and JSON output formats:
- DiffToText(): Unix diff-style output with +/- symbols
- DiffToJSON(): Structured JSON format for programmatic use
- Proper JSON escaping and formatting
- Sorted output for consistent results
### usddiff command-line tool:
- Full-featured CLI application in examples/usddiff/
- Support for --json and --help options
- USD file loading with error handling
- Support for all USD formats (.usd, .usda, .usdc, .usdz)
- Comprehensive documentation and usage examples
## Implementation Details
- Path-based diff organization using USD scene graph paths
- Efficient O(n log n) sorting for consistent output
- Configurable depth limits (default: 1M levels) for security
- Proper error handling and input validation
- CMake integration with TinyUSDZ build system
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
