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/uptime-kuma/custom/test_spa_branding.py

@@ -42,9 +42,9 @@ def test_uptime_kuma_spa_has_branding(live_app):
 
     body = harness_http.assert_converges(_ready, f"GET {url}", max_wait=60, interval=3)
     lower = body.lower()
-    assert (
-        "uptime kuma" in lower or "kuma" in lower
-    ), f"Page body has no 'kuma' brand. Excerpt: {body[:200]!r}"
+    assert "uptime kuma" in lower or "kuma" in lower, (
+        f"Page body has no 'kuma' brand. Excerpt: {body[:200]!r}"
+    )
     # SPA-bundle markers: at least one of these reference paths should be present
     bundle_markers = ("/assets/", "/icon.svg", "favicon", "main.")
     present = [m for m in bundle_markers if m in body]