style(vault): format gen_eval_embeddings.py for the widened lint scope

Not my file, and the change carries no meaning: the parse tree before and after is byte-identical
under ast.dump, three lines reflowed. It is here because the previous commit put scripts/ under
ruff format --check, and leaving this one file unformatted would turn CI red on code nobody
touched. Formatting it is the smaller intrusion than excluding it and pretending the scope is
wider than it is.

Author: bradleygauthier

scripts/gen_eval_embeddings.py

@@ -99,7 +99,9 @@ def main() -> int:
         )
         + "\n"
     )
-    print(f"wrote embeddings.npz ({len(doc_ids)} docs, {len(q_ids)} questions, dim {doc_vecs.shape[1]})")
+    print(
+        f"wrote embeddings.npz ({len(doc_ids)} docs, {len(q_ids)} questions, dim {doc_vecs.shape[1]})"
+    )
     return 0