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

data/spells/masterwork_transformation.json

@@ -5,6 +5,7 @@
   "range": "touch",
   "save": "none",
   "base_dc": 10,
+  "cast_time": "long",
   "effects": [],
   "description": "After 1 hour of casting (plus masterwork-priced reagents), a non-masterwork weapon, armor, shield, tool, or skill kit becomes its masterwork equivalent. Item crafting is outside the engine's combat model, so the spell has no mechanical effects here."
 }