style: repo-wide lint pass — make the lint gate green again

Push builds have been RED on the lint step since ~build 209 from accumulated
formatting drift. This is the mechanical cleanup: ruff format + ruff --fix
(UP038 isinstance unions, SIM105 contextlib.suppress, UP031 f-strings, SIM115
tempfile context manager), shfmt -i 2 -ci, nixpkgs-fmt/statix/deadnix (merged
attrsets, dropped unused lib args), yamllint, and shell quoting fixes in
tests/lasuite-docs/setup_custom_tests.sh. No behaviour changes intended;
lint: PASS, unit tests: 138 passed.

tests/bluesky-pds/test_restore.py

@@ -11,6 +11,6 @@ import _p4  # noqa: E402
 
 
 def test_restore_returns_state(live_app):
-    assert _p4.account_exists(live_app), (
-        "restore did not bring back the seeded marker account (PDS data did not survive restore)"
-    )
+    assert _p4.account_exists(
+        live_app
+    ), "restore did not bring back the seeded marker account (PDS data did not survive restore)"