fix(bench): titanic handcrafted twin trims spaces only, matching SQL trim semantics (reviewer note)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: ahrzb

benchmarks/serving_scenarios/titanic.py

@@ -344,7 +344,7 @@ def infer(row: dict) -> dict:
             "age_x_pclass": age_filled * pclass,
             "age_bin": age_bin,
             "has_cabin": 0 if cabin is None else 1,
-            "deck": "U" if cabin is None else cabin.strip()[:1].upper(),
+            "deck": "U" if cabin is None else cabin.strip(" ")[:1].upper(),
             "embarked_s": 1 if emb == "S" else 0,
             "embarked_c": 1 if emb == "C" else 0,
             "embarked_q": 1 if emb == "Q" else 0,