chore(tooling): retire isort dependency

pyproject.toml

@@ -21,7 +21,6 @@ dependencies = [
 [project.optional-dependencies]
 dev = [
   "build==1.5.0",
-  "isort==8.0.1",
   "mypy==2.1.0",
   "pip-audit==2.10.0",
   "pre-commit==4.6.0",
@@ -45,12 +44,6 @@ src = ["src", "tests", "scripts"]
 [tool.ruff.lint]
 select = ["E", "F", "I", "UP", "B"]
 
-[tool.isort]
-profile = "black"
-line_length = 88
-src_paths = ["src", "tests"]
-known_first_party = ["probaboracle"]
-
 [tool.mypy]
 python_version = "3.10"
 mypy_path = "src"

src/probaboracle/doctor_env.py

@@ -92,7 +92,6 @@ def _check_imports() -> int:
 
     optional_dev_modules = [
         "build",
-        "isort",
         "mypy",
     ]
     for name in optional_dev_modules:

tests/test_tooling_contract.py

@@ -67,6 +67,18 @@ def test_runtime_docs_name_the_make_targets(self) -> None:
         ):
             self.assertIn(command, docs)
 
+    def test_import_sorting_is_owned_by_ruff_not_isort_extension(self) -> None:
+        pyproject = read("pyproject.toml")
+        doctor = read("src/probaboracle/doctor_env.py")
+
+        self.assertIn('select = ["E", "F", "I", "UP", "B"]', pyproject)
+        self.assertIn("ruff check scripts src tests", read("Makefile"))
+        self.assertIn("ruff format --check scripts src tests", read("Makefile"))
+
+        self.assertNotIn('"isort', pyproject)
+        self.assertNotIn("[tool.isort]", pyproject)
+        self.assertNotIn('"isort"', doctor)
+
 
 if __name__ == "__main__":
     unittest.main()