fix(lookup): partition dedup by name instead of group

ROW_NUMBER() was partitioning by `group`, collapsing all 12 US/* timezones
(which share group="United States") down to a single record. Partitioning
by `name` correctly deduplicates by timezone identity while still preserving
the object > account > global override hierarchy.

Priority-only list now returns the expected 72 entries. Adds a regression
test asserting all 12 US/* timezones are present in the full list.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/e2e/test_e2e_v3_lookup.py

@@ -75,13 +75,35 @@ def test_lookup_resolve(lu_type, query):
         print_result(f"GET /{lu_type}/resolve?q={query}", False, str(e))
         return False
 
+US_TIMEZONES = [
+    "US/Alaska", "US/Arizona", "US/Central", "US/East-Indiana",
+    "US/Eastern", "US/Hawaii", "US/Indiana-Starke", "US/Michigan",
+    "US/Mountain", "US/Pacific", "US/Pacific-New", "US/Samoa",
+]
+
+def test_timezone_us_dedup():
+    """Regression: PARTITION BY `name` fix — all 12 US/* zones must appear."""
+    label = "time_zone US/* deduplication (regression)"
+    data = test_lookup_list("time_zone")
+    if data is None:
+        return
+    names = {item.get("name") for item in data}
+    missing = [tz for tz in US_TIMEZONES if tz not in names]
+    if missing:
+        print_result(label, False, f"Missing: {missing}")
+    else:
+        print_result(label, True, f"All 12 US/* timezones present ({len(data)} total)")
+
 if __name__ == "__main__":
     print(f"🚀 Starting V3 Lookup E2E Suite ({BASE_URL})\n")
     start_suite = time.time()
-    
+
     # 1. Basic Lists (Phase 1)
     test_lookup_list("country")
-    
+
+    print("\n--- Regression: US/* timezone deduplication ---")
+    test_timezone_us_dedup()
+
     print("\n--- Testing Priority Only ---")
     test_lookup_list("time_zone", only_priority=True)