lint: ruff format + one auto-fix so the push self-test is green again

`scripts/lint.sh --fix` from the pinned lint devshell: 90 Python files
reformatted (ruff format, mechanical) and one C420 (dict comprehension →
dict.fromkeys) in tests/unit/test_f211_sso_skip.py. The push self-test had
been failing at the lint stage since build 1313 (2026-08-31) on exactly
these files; nothing else changed.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FqkQq3CDmFWcQ7u1LzoyRz

tests/plausible/test_upgrade.py

@@ -14,6 +14,6 @@ def _psql(domain, sql):
 
 
 def test_upgrade_preserves_data(live_app):
-    assert (
-        _psql(live_app, "SELECT v FROM ci_marker;") == "upgrade-survives"
-    ), "postgres data did not survive the upgrade"
+    assert _psql(live_app, "SELECT v FROM ci_marker;") == "upgrade-survives", (
+        "postgres data did not survive the upgrade"
+    )