Add python style guide

[deeheber]

Add code quality tools and CI

Sets up Black, Ruff, and MyPy for the project with automated CI checks.

Changes

New tools:

• Black for code formatting
• Ruff for linting with auto-fix
• MyPy for type checking

Automation:

• scripts/check-code.sh - runs all checks locally
• .github/workflows/code-quality.yml - CI that runs on PRs
• Kiro hook for development workflow

Code improvements:

• Added type hints to main.py
• Fixed linting issues
• Updated pyproject.toml with dev dependencies

Documentation:

• Python style guide in steering files
• Updated README with development section

Usage

# Run all checks
./scripts/check-code.sh

# Individual tools
black .
ruff check --fix .
mypy .