Add complete build infrastructure for creating single-file Claude Code executables
across all supported platforms using Bun's native compilation features.
- **Cross-platform builds**: Support for Linux (glibc/musl), macOS (Intel/ARM), Windows
- **CPU optimization variants**: Modern (AVX2+) and baseline (pre-2013) CPU support
- **Embedded assets**: All executables include yoga.wasm and ripgrep binaries
- **Optimized builds**: Minification and sourcemaps for production-ready binaries
