Integrate mypy (#8)

* added dependency groups for mypy and makefile with test-types command

* hinted developer to run types tests before a PR

Author: MechaCritter

CONTRIBUTING.md

@@ -2,6 +2,16 @@
 
 Thank you for your interest! Contributions of all kinds are welcome.
 
+
+## PR TODO list - your first PR
+
+Use this checklist to stay on track for your first code PR:
+
+- **Clone this repository**: see [Set up developer environment](#set-up-developer-environment) section.
+- **Check out the coding style**: see [Code style](#code-style) section.
+- **Run tests**: run `make test-types` before you make a PR.
+- **Open a PR** on GitHub.
+
 ## Using AI to contribute
 
 I know, we all use Claude/Codex/OpenClaw and co. to help us write code faster. I am no exception. Just make sure that you review the generated code carefully before you make your PR.

Makefile

@@ -0,0 +1,5 @@
+.PHONY: test-types
+
+# Strict mypy type-checking
+test-types:
+	uv run --group types mypy pyvisim/

pyproject.toml

@@ -48,3 +48,31 @@ include = ["pyvisim", "pyvisim.*"]
 
 [tool.setuptools.package-data]
 pyvisim = ["res/model_files/*.pkl", "res/logging_config.yaml"]
+
+# Dependencies groups to isolate test env from production env
+[dependency-groups]
+types = [
+  "mypy",
+]
+dead-code = [
+  "vulture",
+]
+fmt = [
+  "ruff",
+]
+
+[tool.mypy]
+python_version = "3.14"
+strict = true
+warn_return_any = true
+warn_unused_configs = true
+warn_unused_ignores = true
+show_error_codes = true
+pretty = true
+disallow_untyped_defs = true
+disallow_incomplete_defs = true
+disallow_any_generics = true
+disallow_untyped_calls = true
+no_implicit_optional = true
+check_untyped_defs = true
+exclude = ["^build/", "^dist/", "^\\.venv/", "^venv/"]