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This pull request adds a small Rust command line tool, cpp-syntax-json, which parses a C++ source file using tree sitter and prints its full concrete syntax tree as formatted JSON. The implementation is intentionally simple and beginner friendly, demonstrating basic CLI argument parsing with clap, recursive tree traversal, and JSON serialization with serde. It serves as a minimal, readable example of building a parsing tool in Rust and provides a foundation for future syntax analysis or tooling work.