Import Meta Url

import.meta.url — resolved entirely at compile time, per file, into a plain string literal (this file's own absolute path as a file:// URL, matching real Node/browser convention) — codegen never sees a real "module metadata object". Only the exact `import.meta.url` form is supported: bare `import.meta` or any other member (`import.meta.resolve`, etc.) is a clean parse-time error instead.