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/unit/test_gitea_dep.py

@@ -176,6 +176,5 @@ def test_scm_redirect_assertions(location_url, gitea_domain, client_id, expect_p
     ]
     all_pass = all(checks)
     assert all_pass == expect_pass, (
-        f"Expected {'pass' if expect_pass else 'fail'} for URL {location_url!r}; "
-        f"checks: {checks}"
+        f"Expected {'pass' if expect_pass else 'fail'} for URL {location_url!r}; checks: {checks}"
     )