Added

• Integration tests with real Amazon API calls
• Type hints throughout the codebase using Literal types for country codes
• .env.template file for easier development setup
• Code style guide for AI assistants (.agent/rules/code-style-guide.md)
• Pre-commit hooks with Ruff integration

Changed

• BREAKING: Minimum Python version raised from 3.7 to 3.9
• Migrated from setup.py to pyproject.toml for project configuration
• Replaced multiple linters (Flake8, isort, Black, Pylint) with Ruff
• Replaced Docker-based development environment with uv package manager
• Consolidated coverage, mypy, and pytest configuration into pyproject.toml
• Renamed test files to use _test.py suffix instead of test_ prefix
• Updated GitHub Actions workflows to use uv instead of Docker
• Improved docstrings across the codebase

Removed

• setup.py - replaced by pyproject.toml
• .coveragerc - configuration moved to pyproject.toml
• .flake8 - replaced by Ruff configuration in pyproject.toml
• Docker development environment (docker/, docker-compose.yml)
• Legacy shell scripts (scripts/ directory)
• Custom git hooks (.githooks/) - replaced by pre-commit