Refactor codebase for consistent double‑quoted strings and add type hints
This update replaces single‑quoted literals with double quotes throughout the repository,
standardizes string formatting in setup.py, __init__.py, and test files, and introduces
comprehensive type annotations to improve readability and static analysis support. The changes also
clean up import statements, adjust exception messages for clarity, and ensure the package metadata
uses consistent quoting conventions. 🚀
Solves potential type warning on s.result.