fix(rules): stabilize is a StabilizeEffect that auto-stabilizes a dying creature

tests/test_spell_registry_batch3.py

@@ -27,6 +27,7 @@ from pf1e_simulator.spells import (
     PenaltyEffect,
     SpellEffect,
     SpellSpec,
+    StabilizeEffect,
     SummonEffect,
     TempHpEffect,
     load_spell,
@@ -84,6 +85,7 @@ _EFFECT_TYPES = (
     PenaltyEffect,
     AreaEffect,
     SummonEffect,
+    StabilizeEffect,
     TempHpEffect,
 )