cross-platform: Standardize AST symbol cache paths using pathlib.Path across Linux/macOS/Windows

[Jaswanth1902]

🎯 Problem Statement

File system paths on Windows use backslashes (\) and case-insensitive matching, while Linux and macOS use forward slashes (/) and case-sensitive path semantics. Raw string manipulations can cause cache misses, duplicate symbol entries, or invalid URI resolution when Cartograph runs on different operating systems.

🛠️ Scope of Work

1. Audit cartograph/ for raw string manipulations on file paths (e.g. path.split('\\') or string formatting).
2. Refactor all path normalization to use Python's standard pathlib.Path.resolve() and pathlib.Path.as_posix().
3. Add a multi-OS test matrix (ubuntu-latest, windows-latest, macos-latest) in GitHub Actions to verify AST symbol extraction parity.

🧪 Acceptance Criteria

• All path operations use pathlib.Path standard methods.
• Pytest suite passes across Windows, Linux, and macOS without path-related assertion failures.

🤝 Mentorship & Support

Beginner or intermediate contributors are warmly welcome! If you want to tackle this, reply below and I'll assign it to you.

[ius-sharma]

Guys, can I work this one ??

[Jaswanth1902]

Hi @ius-sharma! Absolutely, assigned to you! Really appreciate you stepping up to help on Omnia. Looking forward to your PR! 🚀