Pre-commit Hooks

Hi, everyone!

This PR introduces pre-commit support to improve code quality and consistency by:

• Adding .pre-commit-config.yaml with hooks for:

  • trailing whitespace removal, end-of-file fixer, and large file checks
  • ruff for linting and formatting
  • mypy for static type checking

• Adding pre-commit as a development dependency in pyproject.toml

• Updating CONTRIBUTING.md with instructions on how to install and use pre-commit hooks

Automating these checks helps maintain a cleaner codebase, reduces manual errors, and enforces the project's coding standards before commits are made.

Testing

• Verified local installation of pre-commit hooks
• Ran hooks manually and verified fixes and type checking
• Ensured all existing tests pass after changes

Example of using