- Add version field to expose extension version through Zend module entry
- Add info mapping to accept arbitrary labels and scalar values for phpinfo()
- Generate PHP_MINFO_FUNCTION to display custom extension information
- Preserve info mapping order in module's phpinfo() section
- Validate version as non-empty string without NUL bytes
- Validate info as mapping of non-empty string labels to scalar values
- Add comprehensive tests for metadata parsing and generation
- Update documentation with extension metadata configuration examples
