fix(rules): scale Power Attack for two-handed weapons and apply its CMB penalty

src/pf1e_simulator/models.py

@@ -239,7 +239,10 @@ class AttackSpec(_FrozenModel):
     the same entry twice. `reach_ft` applies to melee/touch kinds,
     `range_increment_ft` to ranged/touch kinds. `firearm` marks a ranged-touch
     weapon (gun) whose shots resolve against touch AC within the first range
-    increment and against full AC beyond it.
+    increment and against full AC beyond it. `two_handed` marks a weapon swung
+    in two hands (two-handed weapon, one-handed weapon used two hands, or a
+    primary natural with 1.5x Strength) — PF1e Power Attack rolls +50% damage
+    with such a weapon (CRB "Power Attack").
     """
 
     id: str
@@ -254,6 +257,7 @@ class AttackSpec(_FrozenModel):
     range_increment_ft: int | None = None
     count: int = Field(default=1, ge=1)
     firearm: bool = False
+    two_handed: bool = False
 
 
 class DamageReduction(_FrozenModel):