fix(combat): summon spawns only on passable cells

src/pf1e_simulator/combat.py

@@ -2040,8 +2040,7 @@ class CombatEngine:
                 if dr == 0 and dc == 0:
                     continue
                 pos = (center[0] + dr, center[1] + dc)
-                if (0 <= pos[0] < self._grid.height and
-                    0 <= pos[1] < self._grid.width and
+                if (self._grid.passable(pos) and
                     not any(s.pos == pos for s in self._states if s.active)):
                     spawn_pos = pos
                     break