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

pyproject.toml

@@ -3,7 +3,7 @@ name = "compose"
 version = "0.1.0"
 description = "A simple Python package for managing Docker Compose files"
 readme = "README.md"
-requires-python = ">=3.13"
+requires-python = ">=3.9"
 dependencies = [
     "pydantic>=2.11.7",
     "pytest>=8.4.0",
@@ -11,6 +11,16 @@ dependencies = [
     "ruff>=0.12.0",
 ]
 
+[project.optional-dependencies]
+dev = [
+    "mypy>=1.8.0",
+    "pre-commit>=3.6.0",
+    "pytest-cov>=4.1.0",
+    "pytest-mock>=3.12.0",
+    "hypothesis>=6.98.0",
+    "types-PyYAML>=6.0.12",
+]
+
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"
@@ -66,3 +76,53 @@ lint.ignore = [
 
 [tool.ruff.lint.per-file-ignores]
 "tests/*" = ["S101", "D103", "PLR2004"]
+
+[tool.mypy]
+python_version = "3.9"
+warn_return_any = true
+warn_unused_configs = true
+disallow_untyped_defs = true
+disallow_incomplete_defs = true
+check_untyped_defs = true
+disallow_untyped_decorators = true
+no_implicit_optional = true
+warn_redundant_casts = true
+warn_unused_ignores = true
+warn_no_return = true
+warn_unreachable = true
+strict_equality = true
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+python_files = ["test_*.py"]
+python_classes = ["Test*"]
+python_functions = ["test_*"]
+addopts = [
+    "--strict-markers",
+    "--strict-config",
+    "--cov=src",
+    "--cov-report=term-missing",
+    "--cov-report=html",
+    "--cov-report=xml",
+]
+
+[tool.coverage.run]
+source = ["src"]
+omit = [
+    "*/tests/*",
+    "*/test_*",
+]
+
+[tool.coverage.report]
+exclude_lines = [
+    "pragma: no cover",
+    "def __repr__",
+    "if self.debug:",
+    "if settings.DEBUG",
+    "raise AssertionError",
+    "raise NotImplementedError",
+    "if 0:",
+    "if __name__ == .__main__.:",
+    "class .*\\bProtocol\\):",
+    "@(abc\\.)?abstractmethod",
+]