Fix word-split tiebreaker: prefer longer first word

"taskis" was split as "ta skis" instead of "task is" because both
have the same DP score. Changed comparison from > to >= so that
later candidates (with longer first words) win ties.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

klausur-service/backend/cv_review.py

@@ -758,7 +758,8 @@ def _try_split_merged_word(token: str) -> Optional[str]:
                     dp[i] = (new_words, new_sq)
                 else:
                     old_key = (-len(dp[i][0]), dp[i][1])
-                    if new_key > old_key:
+                    if new_key >= old_key:
+                        # >= so that later splits (longer first word) win ties
                         dp[i] = (new_words, new_sq)
 
     if dp[n] is None or len(dp[n][0]) < 2: