added strict mypy checks

pyproject.toml

@@ -24,3 +24,20 @@ dev = [
     "ruff>=0.12.10",
     "safety>=3.6.0",
 ]
+
+[tool.mypy]
+python_version = "3.10"
+warn_return_any = true  # nudge to use stricter types
+warn_unused_configs = true  # nudge to remove unused configs
+disallow_untyped_defs = true  # disallow untyped function definitions
+disallow_incomplete_defs = true  # ensure all parts of a function has type annotation
+check_untyped_defs = true  # dont skip untyped functions
+disallow_untyped_decorators = false  # allow untyped decorators to keep code more readable
+no_implicit_optional = true  # disallow implicit optional types leading to None-mess
+warn_redundant_casts = true  # nudge to use explicit type casts
+warn_unused_ignores = true  # nudge to remove unused ignores
+warn_no_return = true  # catch missing return statements
+warn_unreachable = true  # catch unreachable code
+show_error_codes = true  # show error codes in output
+explicit_package_bases = true  # reduce risk of import confusion
+namespace_packages = true  # enable namespace packages