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/ghost/custom/test_post_roundtrip.py

@@ -43,17 +43,17 @@ def test_create_post_roundtrip(live_app):
     title = f"ccci-marker-{uniq}"
     marker = f"ccci-body-marker-{uniq}-roundtrip"
     created = admin.create_post(title, f"<p>{marker}</p>")
-    assert (
-        created.get("title") == title
-    ), f"created post title mismatch: sent {title!r}, got {created.get('title')!r}"
+    assert created.get("title") == title, (
+        f"created post title mismatch: sent {title!r}, got {created.get('title')!r}"
+    )
 
     # 4) Read it back by id and assert the post survived the round-trip (title always returned;
     #    html returned because we requested ?formats=html).
     got = admin.get_post(created["id"])
-    assert (
-        got.get("title") == title
-    ), f"post title did not round-trip: sent {title!r}, got {got.get('title')!r}"
+    assert got.get("title") == title, (
+        f"post title did not round-trip: sent {title!r}, got {got.get('title')!r}"
+    )
     html = got.get("html") or ""
-    assert (
-        marker in html
-    ), f"post body did not round-trip: marker {marker!r} not in read-back html {html!r}"
+    assert marker in html, (
+        f"post body did not round-trip: marker {marker!r} not in read-back html {html!r}"
+    )