feat: add Makefile with common development targets

Add convenient make targets for development workflow:
- make help: Display all available commands
- make venv: Create virtual environment
- make install: Install package and dev dependencies
- make test: Run tests quickly
- make test-vendor: Run catalog vendor tests
- make test-cov: Run tests with coverage
- make test-all: Run full tox test suite
- make lint: Run code quality checks
- make format: Format code
- make clean: Clean build artifacts

Follows the same help format as toolbox-altimate/Makefile.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: jontsai

Makefile

@@ -0,0 +1,54 @@
+.PHONY: help venv install test test-vendor test-cov test-all clean lint format
+
+## help - Display help about make targets for this Makefile
+help:
+	@cat Makefile | grep '^## ' --color=never | cut -c4- | sed -e "`printf 's/ - /\t- /;'`" | column -s "`printf '\t'`" -t
+
+## venv - Create virtual environment
+venv:
+	python3 -m venv .venv
+	.venv/bin/pip install --upgrade pip
+	@echo ""
+	@echo "Virtual environment created. Activate with:"
+	@echo "  source .venv/bin/activate"
+
+## install - Install package and dependencies in development mode
+install:
+	pip install -e .
+	pip install pytest pytest-cov tox pre-commit ruff
+
+## test - Run tests quickly
+test:
+	python -m pytest tests/ -v
+
+## test-vendor - Run catalog vendor tests
+test-vendor:
+	python -m pytest tests/test_vendor/test_catalog_v1.py -v
+
+## test-cov - Run tests with coverage report
+test-cov:
+	python -m pytest --cov=src --cov-report=term-missing --cov-report=html tests/ -v
+
+## test-all - Run full test suite with tox (all Python/Pydantic versions)
+test-all:
+	tox
+
+## lint - Run code quality checks
+lint:
+	pre-commit run --all-files
+
+## format - Format code with ruff
+format:
+	ruff format src/ tests/
+
+## clean - Remove build artifacts and cache
+clean:
+	rm -rf build/
+	rm -rf dist/
+	rm -rf *.egg-info
+	rm -rf .pytest_cache/
+	rm -rf .tox/
+	rm -rf htmlcov/
+	rm -rf .coverage
+	find . -type d -name __pycache__ -exec rm -rf {} +
+	find . -type f -name '*.pyc' -delete