- Add build-typephp-program.sh script for compiling PHP to WASI
- Integrate HTTP fetch capability via file_get_contents() using WASI HTTP
- Move WASI builder script from projects/php-8.5.9/wasm to wasm directory
- Add PhpxLocator class to resolve PHPX directory with proper fallback logic
- Update compiler to pass PHPX directory and compiler executable to builder
- Add WASI SDK layout
