fix(rules): entangled casting needs DC 15+level concentration; add -4 dex_skills

src/pf1e_simulator/conditions.py

@@ -122,13 +122,17 @@ EXHAUSTED = Condition(
 )
 
 # Entangled: -2 attack, -4 DEX; half speed; can't run or charge (CRB)
-# Approximation: -2 attack, -2 AC (from -4 DEX), -2 ref (from -4 DEX)
+# Approximation: -2 attack, -2 AC (from -4 DEX), -2 ref (from -4 DEX),
+# -4 to Dexterity skills (mirrors grappled/pinned). Casting while entangled
+# requires a DC 15 + spell level concentration check — enforced in
+# ``CombatEngine._spell_cast_interrupted`` (SRD Table 9-1).
 ENTANGLED = Condition(
     name="entangled",
     modifiers=(
         StatModifier(target="attack", value=-2),
         StatModifier(target="ac", value=-2),
         StatModifier(target="ref", value=-2),
+        StatModifier(target="dex_skills", value=-4),  # -4 to Dex skills
     ),
     cant_charge=True,
     speed_mult=0.5,