Upgrade to dev-cmd 0.12.0 and simplify.

python/pyproject.toml

@@ -74,6 +74,7 @@ dev = [
     "setuptools",
     "types-appdirs",
     "types-colorama",
+    "types-setuptools",
     "types-tqdm",
 ]
 
@@ -88,50 +89,21 @@ line-length = 100
 extend-select = ["I"]
 
 [tool.dev-cmd.commands]
-clean = [
-    "python",
-    "-c",
-    """\
-import os
-import shutil
-import sys
-
-import colors
-
-
-# The MyPy cache can get corrupted by swithing Pythons with `uv ... --python ...' and re-building
-# the .venv is cheap; so we clean these as a more restricted form than `git clean -fdx`
-for cache_dir in '.mypy_cache', '.venv':
-    if os.path.exists(cache_dir):
-        shutil.rmtree(cache_dir, ignore_errors=True)
-        print(colors.green(f"Removed directory `{cache_dir}`."), file=sys.stderr)
-    """
-]
-
 fmt = ["ruff", "format"]
 check-fmt = ["ruff", "format", "--diff"]
 
 lint = ["ruff", "check", "--fix"]
 check-lint = ["ruff", "check"]
 
-type-check = ["mypy", "insta_science", "scripts", "test-support", "tests"]
-type-check-38 = [
-    "mypy", "--python-version", "3.8", "insta_science", "scripts", "test-support", "tests"
-]
-type-check-39 = [
-    "mypy", "--python-version", "3.9", "insta_science", "scripts", "test-support", "tests"
-]
-type-check-310 = [
-    "mypy", "--python-version", "3.10", "insta_science", "scripts", "test-support", "tests"
-]
-type-check-311 = [
-    "mypy", "--python-version", "3.11", "insta_science", "scripts", "test-support", "tests"
-]
-type-check-312 = [
-    "mypy", "--python-version", "3.12", "insta_science", "scripts", "test-support", "tests"
-]
-type-check-313 = [
-    "mypy", "--python-version", "3.13", "insta_science", "scripts", "test-support", "tests"
+type-check = [
+    "mypy",
+    "--python-version", "{-py:{markers.python_version}}",
+    "--cache-dir", ".mypy_cache_{markers.python_version}",
+    "setup.py",
+    "insta_science",
+    "scripts",
+    "test-support",
+    "tests",
 ]
 
 [tool.dev-cmd.commands.release]
@@ -148,15 +120,8 @@ accepts-extra-args = true
 checks = [
     "fmt",
     "lint",
-    [
-        "type-check-38",
-        "type-check-39",
-        "type-check-310",
-        "type-check-311",
-        "type-check-312",
-        "type-check-313",
-    ],
-    "test"
+    ["type-check-py3.{8..13}"],
+    "test",
 ]
 ci = [["check-fmt", "check-lint", "type-check"], "test"]
 

python/setup.py

@@ -1,6 +1,8 @@
 # Copyright 2025 Science project contributors.
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
+from __future__ import annotations
+
 import atexit
 import shutil
 import tempfile