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/ghost/test_backup.py

@@ -15,14 +15,11 @@ from harness import lifecycle  # noqa: E402
 
 
 def _mysql(domain, sql):
-    cmd = (
-        'MYSQL_PWD="$(cat /run/secrets/db_password)" '
-        f'mysql -u root -N -s ghost -e "{sql}"'
-    )
+    cmd = 'MYSQL_PWD="$(cat /run/secrets/db_password)" ' f'mysql -u root -N -s ghost -e "{sql}"'
     return lifecycle.exec_in_app(domain, ["sh", "-c", cmd], service="db").strip()
 
 
 def test_backup_captures_state(live_app):
-    assert _mysql(live_app, "SELECT v FROM ci_marker;") == "original", (
-        "the seeded ghost MySQL marker was not present at backup time"
-    )
+    assert (
+        _mysql(live_app, "SELECT v FROM ci_marker;") == "original"
+    ), "the seeded ghost MySQL marker was not present at backup time"