fix(rules): correct the evil eye hex

PF1e (APG Evil Eye): the target takes -2 on ONE chosen option (AC, ability checks, attack rolls, saving throws or skill checks) for 3 rounds, and "A Will save reduces this to just 1 round" — it never negates. _hex_evil_eye applied shaken (-2 attack AND saves) for 1 round with the save negating entirely. It now adds a targeted -2 attack ActiveBuff for 3 rounds, or 1 round on a successful Will save. Simplification documented in README: the option choice is not modeled (attack rolls are the engine's target). The hex-DC behavioral test now reads the -2 attack (3r) transcript line.

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

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

src/pf1e_simulator/combat.py

@@ -4756,27 +4756,28 @@ class CombatEngine:
         elif hex_name == "cackle":
             self._hex_cackle(state, target)
 
+    _EVIL_EYE_ROUNDS = 3
+    _EVIL_EYE_SAVED_ROUNDS = 1
+
     def _hex_evil_eye(
         self, state: CombatantState, target: CombatantState, hex_dc: int
     ) -> None:
-        """Evil Eye: shaken (-2 AC or saves), 1 round, Will negates."""
+        """Evil Eye (APG): -2 on one chosen option for 3 rounds; a Will save
+        reduces it to 1 round (never negates). Simplification: the chosen
+        option is attack rolls — the engine's other hex targets are not
+        selectable per cast."""
         save_result = self.resolve_save(target, "will", hex_dc)
-        if save_result.success:
-            self._log(
-                f"round {self._current_round} {state.combatant.id}: evil eye on "
-                f"{target.combatant.id} -> SAVED"
-            )
-            return
-        target.active_conditions.append(
-            ActiveCondition(
-                condition=CONDITIONS_BY_NAME["shaken"],
-                rounds_left=1,
+        rounds = self._EVIL_EYE_SAVED_ROUNDS if save_result.success else self._EVIL_EYE_ROUNDS
+        target.active_buffs.append(
+            ActiveBuff(
+                modifiers=(StatModifier(target="attack", value=-2),),
+                rounds_left=rounds,
                 source=f"hex: evil_eye by {state.combatant.id}",
             )
         )
         self._log(
             f"round {self._current_round} {state.combatant.id}: evil eye on "
-            f"{target.combatant.id} -> shaken (1r)"
+            f"{target.combatant.id} -> -2 attack ({rounds}r)"
         )
 
     def _hex_slumber(