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!!!

Bag is the abstract base class for all inventory containers. It defines the common contract for storing, validating, and manipulating Item instances. The base implementation intentionally does very little — most methods return Fail or Success by default. Concrete implementations (e.g., ListBag, GridBag) provide the actual behavior. Derived classes are expected to override the relevant methods.

### CanAdd
```cs
public Result CanAdd(Item item);
```

### CanRemove
```cs
public Result CanRemove(Item item);
```

### Add
```cs
public Result Add(Item item)
```

### AddAt
```cs
public Result AddAt(Slot slot, Item item);
```

### AddRange
```cs
public Result AddRange(IEnumerable<Item> items);
```

### Remove
```cs
public Result Remove(Item item);
```

### TransferAll
```cs
public Result TransferAll(Item fromItem, Slot toSlot, Item toItem);
```

### TransferOne
```cs
public Result TransferOne(Item fromItem, Slot toSlot, Item toItem);
```

### SplitHalf
```cs
public Result SplitHalf(Item item);
```