fix(spells): backfill casting times for all imported spells

data/spells/enhanced_diplomacy.json

@@ -5,6 +5,7 @@
   "range": "touch",
   "save": "will",
   "base_dc": 10,
+  "cast_time": "standard",
   "effects": [],
   "description": "A cantrip: the subject gains a +2 competence bonus on a single Diplomacy or Intimidate check, declared before the roll (duration 1 minute or until discharged). Will negates (harmless). Social skill effect only: the engine does not model skill-check modifiers, so the spell has no mechanical effects here."
 }