Update cron dataset

manifest.json

@@ -1,14 +1,14 @@
 {
   "format": "chatml",
   "cron_variant": "unix-5-fields-or-INVALID",
-  "total_examples": 1564,
-  "train_examples": 1251,
-  "valid_examples": 156,
-  "test_examples": 157,
+  "total_examples": 1811,
+  "train_examples": 1448,
+  "valid_examples": 181,
+  "test_examples": 182,
   "model_for_synthetic_generation": "google/gemini-3.1-flash-lite",
   "sources": {
-    "template": 1387,
-    "llm": 177
+    "template": 1565,
+    "llm": 246
   },
   "families": [
     "cron_aliases",
@@ -23,9 +23,9 @@
     "midnight_noon_at",
     "month_specific",
     "monthly_on_day_at",
+    "multi_time_at",
     "multi_weekday_at",
     "partial_week_range",
-    "twice_daily",
     "weekdays_at",
     "weekend_at",
     "weekly_on_day_at"