fix(rules): add alchemical/inherent/resistance/size bonus types (UM Table 2-7) as non-stacking

src/pf1e_simulator/effects.py

@@ -44,6 +44,13 @@ BonusType = Literal[
     "shield",         # no stack
     "armor",          # no stack (SRD mage armor: "+4 armor bonus to AC")
     "circumstance",   # no stack (simulator can't distinguish circumstances)
+    # SRD "Ultimate Magic" Table 2-7: Bonus Types and Effects — remaining
+    # named types, all non-stacking like every typed bonus (CRB "Combining
+    # Magic Effects": "two bonuses of the same type don't stack").
+    "alchemical",     # no stack (UM T2-7: ability scores, saves; antitoxin)
+    "inherent",       # no stack (UM T2-7: ability scores; Manual of bodily health)
+    "resistance",     # no stack (UM T2-7: saves; cloak of resistance)
+    "size",           # no stack (UM T2-7: ability scores, attacks, AC; enlarge person)
 ]
 
 StatTarget = Literal[

tests/test_effects.py

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from pf1e_simulator.effects import StatModifier, resolve_modifiers
+from pf1e_simulator.effects import BonusType, StatModifier, resolve_modifiers
 
 # ── Stacking types: sum together ──────────────────────────────────────────────
 
@@ -228,3 +228,19 @@ class TestEdgeCases:
             StatModifier("ac", 3, "morale"),
         ]
         assert resolve_modifiers(mods) == 3  # same non-stacking type → max(2, 3)
+
+    def test_um_table_2_7_bonus_types_parse_and_do_not_stack(self) -> None:
+        # SRD "Ultimate Magic" Table 2-7 types: alchemical, inherent,
+        # resistance, size — accepted by StatModifier, non-stacking.
+        new_types: tuple[BonusType, ...] = (
+            "alchemical",
+            "inherent",
+            "resistance",
+            "size",
+        )
+        for bonus_type in new_types:
+            mods = [
+                StatModifier("ac", 2, bonus_type),
+                StatModifier("ac", 4, bonus_type),
+            ]
+            assert resolve_modifiers(mods) == 4, bonus_type