feat: implement encounter reset mechanics for rooms and doors

src/door.py

@@ -37,3 +37,7 @@ class Door:
             if self.current_hp <= 0:
                 self.current_hp = 0
                 self.is_closed = False
+
+    def reset(self):
+        self.current_hp = self.max_hp
+        self.is_closed = False

src/game.py

@@ -222,10 +222,21 @@ class Game:
         if room_key == self.current_room_key:
             return
 
+        if self.current_room_key is not None:
+            self.reset_active_encounter()
+
         self.item_manager.clear()
         self.tower.clear(reset_spawned=True)
         self.current_room_key = room_key
 
+    def reset_active_encounter(self) -> None:
+        """Reset the room attack once the player exits through the door."""
+
+        if self.active_door is not None:
+            self.active_door.reset()
+            self.active_door = None
+        self.monsters.reset_encounter()
+
     def update_items(self, player_rect: pygame.Rect, room_rect: Optional[pygame.Rect]) -> None:
         """Spawn room items and process one player purchase request."""
 

src/monster.py

@@ -180,6 +180,14 @@ class MonsterManager:
         for monster in self.monsters:
             monster.wake_up()
 
+    def reset_encounter(self) -> None:
+        """Stop the room attack and put all active monsters back into normal state."""
+
+        self.active_target_tile = None
+        self.active_door = None
+        for monster in self.monsters:
+            monster.sleep()
+
     def update(
         self,
         dt: float,