style: autoformat src and tests

Repository-wide formatting pass over src/ and tests/: sorted imports and
__all__ entries, dropped redundant `# -*- coding: utf-8 -*-` headers,
unquoted forward-reference annotations (safe under
`from __future__ import annotations`), merged nested `with` statements,
moved `Iterable` and friends from `typing` to `collections.abc`, and
removed `# noqa: F401` markers that no longer suppress anything.

No behavioural changes. Unit and integration suites show the same four
pre-existing failures before and after the pass.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/e2e/test_branch_help.py

@@ -4,7 +4,7 @@ import io
 import runpy
 import sys
 import unittest
-from contextlib import redirect_stdout, redirect_stderr
+from contextlib import redirect_stderr, redirect_stdout
 
 
 def _run_pkgmgr_help(argv_tail: list[str]) -> str:

tests/e2e/test_changelog_commands.py

@@ -6,8 +6,8 @@ import sys
 import unittest
 
 from test_version_commands import (
-    _load_pkgmgr_repo_dir,
     PROJECT_ROOT,
+    _load_pkgmgr_repo_dir,
 )
 
 

tests/e2e/test_clone_all.py

@@ -16,8 +16,8 @@ import unittest
 
 from test_install_pkgmgr_shallow import (
     nix_profile_list_debug,
-    remove_pkgmgr_from_nix_profile,
     pkgmgr_help_debug,
+    remove_pkgmgr_from_nix_profile,
 )
 
 

tests/e2e/test_config_commands.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-# -*- coding: utf-8 -*-
 
 """
 Integration tests for the `pkgmgr config` command.

tests/e2e/test_install_makefile_three_times.py

@@ -1,8 +1,9 @@
-from tests.e2e._util import run
 import tempfile
 import unittest
 from pathlib import Path
 
+from tests.e2e._util import run
+
 
 class TestMakefileThreeTimes(unittest.TestCase):
     def test_make_install_three_times(self):

tests/e2e/test_install_pkgmgr_shallow.py

@@ -1,8 +1,8 @@
-import runpy
-import sys
 import os
-import unittest
+import runpy
 import subprocess
+import sys
+import unittest
 
 
 def nix_profile_list_debug(label: str) -> None:

tests/e2e/test_install_pkgmgr_three_times_nix.py

@@ -1,9 +1,10 @@
 import os
-from tests.e2e._util import run
 import tempfile
 import unittest
 from pathlib import Path
 
+from tests.e2e._util import run
+
 
 class TestPkgmgrInstallThreeTimesNix(unittest.TestCase):
     def test_three_times_install_nix(self):

tests/e2e/test_install_pkgmgr_three_times_venv.py

@@ -1,8 +1,9 @@
-from tests.e2e._util import run
+import os
 import tempfile
 import unittest
 from pathlib import Path
-import os
+
+from tests.e2e._util import run
 
 
 class TestPkgmgrInstallThreeTimesVenv(unittest.TestCase):

tests/e2e/test_make_commands.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-# -*- coding: utf-8 -*-
 
 """
 Integration tests for the `pkgmgr make` command.

tests/e2e/test_nix_build_pkgmgr.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-# -*- coding: utf-8 -*-
 
 """
 E2E test to inspect the Nix environment and build the pkgmgr flake
@@ -22,7 +21,6 @@ import os
 import subprocess
 import unittest
 
-
 # Resolve project root (the repo where flake.nix lives, e.g. /src)
 PROJECT_ROOT = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", ".."))
 

tests/e2e/test_path_commands.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-# -*- coding: utf-8 -*-
 
 """
 End-to-end tests for the `pkgmgr path` command.

tests/e2e/test_publish_commands.py

@@ -5,7 +5,6 @@ import shutil
 import subprocess
 import unittest
 
-
 PROJECT_ROOT = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", ".."))
 
 

tests/e2e/test_release_commands.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-# -*- coding: utf-8 -*-
 
 """
 End-to-end style integration tests for the `pkgmgr release` CLI command.
@@ -141,8 +140,8 @@ class TestIntegrationReleaseCommand(unittest.TestCase):
         This test intentionally does not mock anything to exercise the real
         CLI parser wiring in main.py.
         """
-        import io
         import contextlib
+        import io
 
         original_argv = list(sys.argv)
         buf = io.StringIO()

tests/e2e/test_tools_commands.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-# -*- coding: utf-8 -*-
 
 """
 Integration tests for the "tools" commands:

tests/e2e/test_update_all_no_system.py

@@ -22,8 +22,8 @@ from pathlib import Path
 
 from test_install_pkgmgr_shallow import (
     nix_profile_list_debug,
-    remove_pkgmgr_from_nix_profile,
     pkgmgr_help_debug,
+    remove_pkgmgr_from_nix_profile,
 )
 
 

tests/e2e/test_update_pkgmgr_system.py

@@ -21,8 +21,8 @@ from pathlib import Path
 
 from test_install_pkgmgr_shallow import (
     nix_profile_list_debug,
-    remove_pkgmgr_from_nix_profile,
     pkgmgr_help_debug,
+    remove_pkgmgr_from_nix_profile,
 )
 
 

tests/e2e/test_version_commands.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-# -*- coding: utf-8 -*-
 
 """
 End-to-end tests for the `pkgmgr version` command.