chore(review): drop the trailing blank line that fails check:diff

Release builder runs `git diff --check`; scripts/review_corpus.py ended with an extra newline, so the gate failed on the PR head. Whitespace only; no behaviour change.

scripts/review_corpus.py

@@ -459,4 +459,3 @@ def build_queue(dataset_root: Path, limit: int | None = None) -> list[dict]:
 
 if __name__ == "__main__":
     sys.exit(main())
-