dev: add dev tools, pre-commit, Makefile, contributing, changelog, CI, and fix python version

Makefile

@@ -0,0 +1,49 @@
+.PHONY: help install install-dev test test-cov lint format type-check clean build publish
+
+help:  ## Show this help message
+	@echo "Available commands:"
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-20s\033[0m %s\n", $$1, $$2}'
+
+install:  ## Install the package in development mode
+	uv pip install -e .
+
+install-dev:  ## Install the package with development dependencies
+	uv pip install -e ".[dev]"
+
+test:  ## Run tests
+	uv run pytest
+
+test-cov:  ## Run tests with coverage
+	uv run pytest --cov=src --cov-report=html --cov-report=term-missing
+
+lint:  ## Run linting checks
+	uv run ruff check src/ tests/ example/
+
+format:  ## Format code
+	uv run ruff format src/ tests/ example/
+
+type-check:  ## Run type checking
+	uv run mypy src/
+
+clean:  ## Clean up build artifacts
+	rm -rf build/
+	rm -rf dist/
+	rm -rf *.egg-info/
+	rm -rf .pytest_cache/
+	rm -rf .coverage
+	rm -rf htmlcov/
+	rm -rf .mypy_cache/
+
+build:  ## Build the package
+	uv run python -m build
+
+publish:  ## Publish to PyPI (requires authentication)
+	uv run python -m twine upload dist/*
+
+pre-commit-install:  ## Install pre-commit hooks
+	uv run pre-commit install
+
+pre-commit-run:  ## Run pre-commit on all files
+	uv run pre-commit run --all-files
+
+check-all: lint type-check test  ## Run all checks (lint, type-check, test)