feat(character): add hand slot API (attach/detach/get_held_item/is_hand_free)

scripts/characters/character.gd

@@ -87,6 +87,49 @@ func get_outfit(layer: int) -> String:
 	return data.outfit[layer - 1]
 
 
+func attach_item(hand: String, item: Node2D) -> bool:
+	if hand != "left" and hand != "right":
+		return false
+	var slot: Node2D = get_node_or_null("Hand" + hand.capitalize()) as Node2D
+	if slot == null:
+		return false
+	if slot.get_child_count() > 0:
+		return false
+	var old_parent: Node = item.get_parent()
+	if old_parent != null:
+		old_parent.remove_child(item)
+	slot.add_child(item)
+	item.position = Vector2.ZERO
+	return true
+
+
+func detach_item(hand: String) -> Node2D:
+	if hand != "left" and hand != "right":
+		return null
+	var slot: Node2D = get_node_or_null("Hand" + hand.capitalize()) as Node2D
+	if slot == null or slot.get_child_count() == 0:
+		return null
+	var item: Node2D = slot.get_child(0) as Node2D
+	slot.remove_child(item)
+	var scene_parent: Node = get_parent()
+	if scene_parent != null:
+		scene_parent.add_child(item)
+	return item
+
+
+func get_held_item(hand: String) -> Node2D:
+	if hand != "left" and hand != "right":
+		return null
+	var slot: Node2D = get_node_or_null("Hand" + hand.capitalize()) as Node2D
+	if slot == null or slot.get_child_count() == 0:
+		return null
+	return slot.get_child(0) as Node2D
+
+
+func is_hand_free(hand: String) -> bool:
+	return get_held_item(hand) == null
+
+
 func _update_visual_state() -> void:
 	if data == null:
 		return

test/unit/test_character_v2.gd

@@ -112,3 +112,60 @@ func test_set_outfit_invalid_layer_zero_is_noop() -> void:
 func test_set_outfit_invalid_layer_four_is_noop() -> void:
 	_char.set_outfit(4, "white_coat", null)
 	assert_eq(_char.get_outfit(3), "")
+
+
+func test_both_hands_free_initially() -> void:
+	assert_true(_char.is_hand_free("left"))
+	assert_true(_char.is_hand_free("right"))
+
+
+func test_attach_item_to_left_hand() -> void:
+	var item: Node2D = Node2D.new()
+	add_child_autofree(item)
+	_char.attach_item("left", item)
+	assert_false(_char.is_hand_free("left"))
+
+
+func test_get_held_item_returns_attached_item() -> void:
+	var item: Node2D = Node2D.new()
+	add_child_autofree(item)
+	_char.attach_item("right", item)
+	assert_eq(_char.get_held_item("right"), item)
+
+
+func test_attach_to_occupied_hand_returns_false() -> void:
+	var item1: Node2D = Node2D.new()
+	var item2: Node2D = Node2D.new()
+	add_child_autofree(item1)
+	add_child_autofree(item2)
+	_char.attach_item("left", item1)
+	var result: bool = _char.attach_item("left", item2)
+	assert_false(result)
+
+
+func test_attach_returns_true_on_success() -> void:
+	var item: Node2D = Node2D.new()
+	add_child_autofree(item)
+	var result: bool = _char.attach_item("right", item)
+	assert_true(result)
+
+
+func test_detach_item_frees_hand() -> void:
+	var item: Node2D = Node2D.new()
+	add_child_autofree(item)
+	_char.attach_item("left", item)
+	_char.detach_item("left")
+	assert_true(_char.is_hand_free("left"))
+
+
+func test_detach_returns_item() -> void:
+	var item: Node2D = Node2D.new()
+	add_child_autofree(item)
+	_char.attach_item("right", item)
+	var returned: Node2D = _char.detach_item("right")
+	assert_eq(returned, item)
+
+
+func test_detach_from_empty_hand_returns_null() -> void:
+	var returned: Node2D = _char.detach_item("left")
+	assert_null(returned)