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/n8n/custom/test_login_state.py

@@ -91,6 +91,6 @@ def test_login_endpoint_returns_json(live_app):
     assert body is not None, f"/rest/login returned no parseable JSON: state={state}"
     # If it's a dict, it's the expected envelope; if it's a list, n8n shouldn't do that on this
     # endpoint, but accept either; only reject obvious non-shapes.
-    assert isinstance(
-        body, dict | list
-    ), f"/rest/login returned unexpected JSON type {type(body).__name__}: {body!r}"
+    assert isinstance(body, dict | list), (
+        f"/rest/login returned unexpected JSON type {type(body).__name__}: {body!r}"
+    )