fix(package-info): resolve package.json from any directory depth

- Replace hardcoded `../..` path resolution with walk-up algorithm that searches ancestor directories
- Add `findPackageJson()` function to traverse directory tree until package.json is found
- Import `existsSync` from fs module to check for file existence during traversal
- Add comprehensive property-based tests to validate fix works at any directory depth
- Bump version to 0.1.9
- Fixes bug where packageInfo() only worked when called from exactly 2 levels deep