Zig got better and I almost missed it

Zig 0.15 brings major improvements including a self-hosted x86 backend (up to 5× faster debug builds), 50% speedup from threaded codegen, and removal of async/await keywords. The standard library underwent significant changes with non-generic Reader/Writer interfaces ("Writergate"), unmanaged ArrayList as default, and HTTP client/server reworks. Language changes include switch support for non-exhaustive enums, usingnamespace removal, and stricter int-to-float casting. The build system adds a web UI and improved templates. Future plans include AArch64 backend, incremental compilation, and a new I/O interface for colorless async.