Fix dataclass equality causing duplicate items in move_to

Objects were comparing by value instead of identity, causing
list.remove() to remove the wrong object when moving items with
identical attributes. Set eq=False on all dataclasses to use
identity-based comparison.

src/mudlib/container.py

@@ -8,7 +8,7 @@ from mudlib.object import Object
 from mudlib.thing import Thing
 
 
-@dataclass
+@dataclass(eq=False)
 class Container(Thing):
     """A container that can hold other items.
 

src/mudlib/entity.py

@@ -7,7 +7,7 @@ from dataclasses import dataclass, field
 from mudlib.object import Object
 
 
-@dataclass
+@dataclass(eq=False)
 class Entity(Object):
     """Base class for anything with position and identity in the world.
 
@@ -68,7 +68,7 @@ class Entity(Object):
         pass
 
 
-@dataclass
+@dataclass(eq=False)
 class Mob(Entity):
     """Represents a non-player character (NPC) in the world."""
 

src/mudlib/object.py

@@ -6,7 +6,7 @@ from collections.abc import Awaitable, Callable
 from dataclasses import dataclass, field
 
 
-@dataclass
+@dataclass(eq=False)
 class Object:
     """Base class for everything in the world.
 

src/mudlib/player.py

@@ -17,7 +17,7 @@ if TYPE_CHECKING:
     from mudlib.if_session import IFSession
 
 
-@dataclass
+@dataclass(eq=False)
 class Player(Entity):
     """Represents a connected player."""
 

src/mudlib/thing.py

@@ -7,7 +7,7 @@ from dataclasses import dataclass, field
 from mudlib.object import Object
 
 
-@dataclass
+@dataclass(eq=False)
 class Thing(Object):
     """An item in the world.
 

src/mudlib/zone.py

@@ -8,7 +8,7 @@ from dataclasses import dataclass, field
 from mudlib.object import Object
 
 
-@dataclass
+@dataclass(eq=False)
 class SpawnRule:
     """Configuration for spawning mobs in a zone.
 
@@ -21,7 +21,7 @@ class SpawnRule:
     respawn_seconds: int = 300
 
 
-@dataclass
+@dataclass(eq=False)
 class Zone(Object):
     """A spatial area with a grid of terrain tiles.