fix(rules): CMD never adds Dex on top of a Tiny Dex-substituted pre-baked CMB

src/pf1e_simulator/combat.py

@@ -4782,11 +4782,23 @@ class CombatEngine:
         # Strength modifier + Dexterity modifier + special size modifier" —
         # the Tiny-or-smaller Dex-for-Str substitution is CMB-only, so the
         # ability component is computed here instead of via _maneuver_cmb.
-        target_base = target.combatant.cmb or (
-            target.combatant.bab
-            + target.combatant.abilities.str_mod
-            + self._size_mod(target)
-        )
+        # A pre-baked CMB on a Tiny-or-smaller creature ALREADY carries that
+        # substitution (SRD: they "use their Dexterity modifier in place of
+        # their Strength modifier to determine their CMB"), so it must never
+        # seed the CMD base — the extra Dexterity below would be double-
+        # counted and Strength lost. Use the raw CMD formula for those sizes.
+        if target.combatant.size.lower() in _TINY_OR_SMALLER_SIZES:
+            target_base = (
+                target.combatant.bab
+                + target.combatant.abilities.str_mod
+                + self._size_mod(target)
+            )
+        else:
+            target_base = target.combatant.cmb or (
+                target.combatant.bab
+                + target.combatant.abilities.str_mod
+                + self._size_mod(target)
+            )
         # PF1e (SRD Combat Maneuver Defense): "A creature can also add any
         # circumstance, deflection, dodge, insight, luck, morale, profane,
         # and sacred bonuses to AC to its CMD. [...] A flat-footed creature