Migrate to ty from mypy

Author: andrewwkimm

Makefile

@@ -25,7 +25,7 @@ test:
 	uv run pytest -x --cov
 
 type_check:
-	uv run mypy tests --ignore-missing-import
+	uv run ty check tests
 
 ################################################################################
 

pyproject.toml

@@ -22,14 +22,14 @@ dependencies = [
 [dependency-groups]
 dev = [
     "coverage>=7.9.1",
-    "mypy>=1.16.1",
     "pytest>=8.4.1",
     "pytest-cov>=6.2.1",
     "pytest-mock>=3.14.1",
     "ruff>=0.12.0",
     "behave>=1.2.6",
     "pre-commit>=4.3.0",
     "nox>=2025.10.14",
+    "ty>=0.0.1a24",
 ]
 
 [project.scripts]
@@ -49,13 +49,6 @@ testpaths = ["tests"]
 [tool.pyright]
 include = ["src"]
 
-[tool.mypy]
-files = ["src", "tests"]
-cache_dir = "${HOME}/.mypy_cache"
-ignore_errors = false
-disallow_untyped_defs = true
-exclude = 'features/steps/.*'
-
 [tool.ruff]
 target-version = "py311"
 line-length = 88
@@ -72,6 +65,10 @@ lint.select = [
   "D",   # pydocstyle
   "PL",  # pylint-like
   "C90", # mccabe
+  "PERF", # performance
+  "RUF", # ruff-specific
+  "PTH", # pathlib
+  "FLY", # f-strings
 ]
 
 lint.ignore = []