magnus-bindings

- Use `magnus` crate for Ruby native extensions. Define classes with `magnus::define_class`. - Map Rust types to Ruby using `TryConvert` and `IntoValue` traits. Return `Result<T, magnus::Error>`. - Use `magnus::function!` macro for defining Ruby methods. Use `magnus::method!` for instance methods. - Map Rust errors to specific Ruby exceptions: `magnus::Error::new(exception::runtime_error(), msg)`. - Build with `rb_sys` crate and `magnus-build` for compilation. Use `rake-compiler` for gem distribution. - Support Ruby 3.2+ with multiple ABI versions. - Test bindings from Ruby using RSpec or Minitest. Test error handling and edge cases. - Keep Ruby wrapper gem thin — business logic in Rust, Ruby provides idiomatic API. - Handle Ruby's GVL (Global VM Lock) — release for CPU-intensive Rust code. - Use `TypedData` for wrapping Rust structs as Ruby objects with proper GC integration. - Anti-patterns: panics in Ruby methods, `unsafe` without `SAFETY` comments, manual memory management.