Add pre-commit hooks for code quality and security

[saquibsaifee]

Proposal

Add pre-commit hooks to automate code quality and security checks before commits.

Current State

• No automated code quality checks
• Style and security issues caught only during PR reviews
• No standardized contribution workflow

Proposed Pre-commit Hooks

# .pre-commit-config.yaml
repos:
  - repo: https://github.com/astral-sh/ruff-pre-commit
    hooks:
      - id: ruff          # Linting
      - id: ruff-format   # Code formatting

  - repo: https://github.com/pre-commit/mirrors-mypy
    hooks:
      - id: mypy          # Type checking

  - repo: https://github.com/PyCQA/bandit
    hooks:
      - id: bandit        # Security scanning

  - repo: https://github.com/pre-commit/pre-commit-hooks
    hooks:
      - id: trailing-whitespace
      - id: end-of-file-fixer
      - id: check-yaml
      - id: check-added-large-files

Benefits

1. ✅ Catches issues before commit (faster feedback)
2. ✅ Consistent code style across contributors
3. ✅ Automated security scanning
4. ✅ Reduces PR review time
5. ✅ Enforces best practices automatically

[saquibsaifee]

@e2hln @eaglei15 Let me know and I can open a PR against v0.2 branch