fix(rules): apply the power attack penalty to melee touch attacks

PF1e (CRB Power Attack): "take a -1 penalty on all melee attack rolls ...
The bonus damage does not apply to touch attacks." A melee touch (kind
"touch", no range increment) is a melee attack, so _power_attack_amt now
rides its attack and confirmation rolls; the +2X/+3X damage bonus stays
gated on kind == "melee". Ranged attacks and rays are unaffected. The
test that pinned the old melee-weapon-only simplification was rewritten to
lock the corrected behavior; README and abilities.py updated.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/pf1e_simulator/abilities.py

@@ -139,8 +139,9 @@ DODGE = AbilitySpec(
     ),
 )
 
-# Power Attack: active feat — declare at turn start, -X atk / +2X dmg on all
-# melee attacks this turn, where X = BAB//4 + 1 (min 1). No passive modifiers;
+# Power Attack: active feat — declare at turn start, -X atk on all melee
+# attack rolls (melee touch included) and +2X dmg on melee WEAPON damage only
+# (never touch), where X = BAB//4 + 1 (min 1). No passive modifiers;
 # the engine checks for this feat and the ``power_attack`` flag on state.
 POWER_ATTACK = AbilitySpec(
     name="Power Attack",

src/pf1e_simulator/combat.py

@@ -2283,7 +2283,12 @@ class CombatEngine:
         if self._is_melee_attack(weapon) and self._is_helpless(target):
             atk_mods.append(StatModifier(target="attack", value=_HELPLESS_MELEE_BONUS))
         attack_mod = resolve_modifiers(atk_mods)
-        pa_amt = self._power_attack_amt(attacker) if weapon.kind == "melee" else 0
+        # PF1e (CRB Power Attack): the -X penalty rides ALL melee attack rolls
+        # — a melee touch (no range increment) is a melee attack. The damage
+        # bonus it buys stays weapon-only (see _resolve_hit_damage).
+        pa_amt = (
+            self._power_attack_amt(attacker) if self._is_melee_attack(weapon) else 0
+        )
         fd_penalty = (
             _FIGHT_DEFENSIVELY_ATTACK_PENALTY if attacker.fight_defensively else 0
         )
@@ -2445,7 +2450,10 @@ class CombatEngine:
         # weapon used in two hands, or a primary natural with 1.5x Strength
         # (modeled via the weapon's `two_handed` flag). The off-hand /
         # secondary-natural halving (-50%, +1X) is NOT modeled: two-weapon
-        # fighting is not in the engine (documented simplification).
+        # fighting is not in the engine (documented simplification). The
+        # bonus damage never applies to touch attacks (CRB), which is why
+        # this gate is kind == "melee" while the -X penalty also rides melee
+        # touch rolls.
         if weapon.kind == "melee":
             damage += pa_amt * (3 if weapon.two_handed else 2)
         if crit: