- Move Chinese docs to docs/zh-cn/ (44 md + RUNTIME_LIFECYCLE.html)
- Move existing English docs to docs/en/
- Translate all Chinese docs to English under docs/en/
- Update README.md links to docs/en/ and README-CN.md to docs/zh-cn/
- Document recommended pipeline from PHP Parser AST to backend-specific code generation
- Define Bound AST structure preserving PHP syntax shape with resolved semantic information
- Specify PHP Semantic IR close to PHP runtime semantics with suggested instruction families
- Outline Runtime ABI operations for consistent
