Zig lands io_uring and GCD implementations, promising 10x faster I/O

Zig's main branch just landed experimental implementations of io_uring (Linux) and Grand Central Dispatch (macOS) for its std.Io.Evented system. These fiber-based async I/O systems promise dramatically faster performance by allowing developers to swap implementations with minimal code changes. While still experimental and requiring better error handling and performance tuning, this positions Zig to potentially outperform established async systems in Rust and Go for high-throughput network applications.