fix(rules): nauseated creatures are denied attacks of opportunity

tests/test_aoo_defense.py

@@ -135,3 +135,22 @@ def test_aoo_not_suppressed_by_partial_concealment() -> None:
     assert engine._resolve_aoo(guard_s, runner_s) is False
     assert engine._aoo_used.get("guard", 0) == 1
     assert not any("suppressed" in line for line in engine._transcript)
+
+
+def test_nauseated_guard_makes_no_aoo() -> None:
+    """Given: the guard is nauseated (SRD: "unable to attack")
+    When: the runner provokes an AoO
+    Then: no opportunity is taken — no die rolled, no budget spent."""
+    runner = make_combatant("runner", hp=20, ac=12)
+    guard = make_combatant("guard", hp=20, ac=15, attack_bonus=5)
+    states = [
+        make_state(runner, "players", (2, 1)),
+        make_state(guard, "monsters", (2, 0)),
+    ]
+    engine = CombatEngine(ScriptedRng([15, 3]), _grid(("....", "....")), states)
+    runner_s, guard_s = engine._states
+    _add_condition(guard_s, "nauseated")
+    assert engine._resolve_aoo(guard_s, runner_s) is False
+    assert engine._aoo_used.get("guard", 0) == 0
+    assert len(engine._rng._queue) == 2
+    assert runner_s.hp == 20