feat(items): add ChestItemData resource and RoomChestConfig static config

TDD: 4 tests written first (FAIL), then implemented — all 151 tests pass.

scripts/objects/chest_item_data.gd

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+## ChestItemData — configuration for a single item slot inside a RoomChest.
+class_name ChestItemData extends Resource
+
+@export var item_id: String = ""
+@export var item_type: String = "holdable"
+@export var outfit_layer: int = 1
+@export var spawn_offset: Vector2 = Vector2.ZERO

scripts/objects/room_chest_config.gd

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+## RoomChestConfig — static item configuration for all room chests.
+## Maps chest_id strings to ChestItemData arrays. No assets needed: item_id strings only.
+class_name RoomChestConfig
+
+
+static func get_items(chest_id: String) -> Array[ChestItemData]:
+	match chest_id:
+		"reception_desk":
+			return _make([
+				["clipboard", "holdable", 1, Vector2(-70.0, -60.0)],
+				["pen", "holdable", 1, Vector2(0.0, -80.0)],
+				["bandage", "holdable", 1, Vector2(70.0, -60.0)],
+			])
+		"giftshop_shelf":
+			return _make([
+				["gift_box", "holdable", 1, Vector2(-70.0, -60.0)],
+				["ribbon", "holdable", 1, Vector2(0.0, -80.0)],
+				["balloon", "holdable", 1, Vector2(70.0, -60.0)],
+			])
+		"restaurant_counter":
+			return _make([
+				["teacup", "holdable", 1, Vector2(-70.0, -60.0)],
+				["plate", "holdable", 1, Vector2(0.0, -80.0)],
+				["spoon", "holdable", 1, Vector2(70.0, -60.0)],
+			])
+		"emergency_cabinet":
+			return _make([
+				["bandage_roll", "holdable", 1, Vector2(-70.0, -60.0)],
+				["syringe", "holdable", 1, Vector2(0.0, -80.0)],
+				["ice_pack", "holdable", 1, Vector2(70.0, -60.0)],
+			])
+		"xray_cabinet":
+			return _make([
+				["xray_sheet", "holdable", 1, Vector2(-70.0, -60.0)],
+				["lead_apron", "outfit", 1, Vector2(0.0, -80.0)],
+				["marker", "holdable", 1, Vector2(70.0, -60.0)],
+			])
+		"pharmacy_medicine":
+			return _make([
+				["pill_bottle", "holdable", 1, Vector2(-50.0, -60.0)],
+				["syrup", "holdable", 1, Vector2(50.0, -60.0)],
+			])
+		"pharmacy_tools":
+			return _make([
+				["mortar", "holdable", 1, Vector2(-50.0, -60.0)],
+				["spatula", "holdable", 1, Vector2(50.0, -60.0)],
+			])
+		"lab_bench":
+			return _make([
+				["test_tube", "holdable", 1, Vector2(-70.0, -60.0)],
+				["pipette", "holdable", 1, Vector2(0.0, -80.0)],
+				["microscope_slide", "holdable", 1, Vector2(70.0, -60.0)],
+			])
+		"patient_cabinet":
+			return _make([
+				["thermometer", "holdable", 1, Vector2(-70.0, -60.0)],
+				["stethoscope", "outfit", 2, Vector2(0.0, -80.0)],
+				["pillow", "holdable", 1, Vector2(70.0, -60.0)],
+			])
+		"ultrasound_cart":
+			return _make([
+				["gel_tube", "holdable", 1, Vector2(-70.0, -60.0)],
+				["probe", "holdable", 1, Vector2(0.0, -80.0)],
+				["towel", "holdable", 1, Vector2(70.0, -60.0)],
+			])
+		"delivery_cabinet":
+			return _make([
+				["swaddle", "outfit", 1, Vector2(-70.0, -60.0)],
+				["scissors", "holdable", 1, Vector2(0.0, -80.0)],
+				["cord_clamp", "holdable", 1, Vector2(70.0, -60.0)],
+			])
+		"nursery_shelf":
+			return _make([
+				["bottle", "holdable", 1, Vector2(-70.0, -60.0)],
+				["rattle", "holdable", 1, Vector2(0.0, -80.0)],
+				["blanket", "outfit", 1, Vector2(70.0, -60.0)],
+			])
+		"garden_table":
+			return _make([
+				["teapot", "holdable", 1, Vector2(-50.0, -60.0)],
+				["cake", "holdable", 1, Vector2(50.0, -60.0)],
+			])
+		"garden_storage":
+			return _make([
+				["confetti", "holdable", 1, Vector2(-50.0, -60.0)],
+				["party_hat", "outfit", 1, Vector2(50.0, -60.0)],
+			])
+	return []
+
+
+static func _make(data: Array) -> Array[ChestItemData]:
+	var result: Array[ChestItemData] = []
+	for entry: Array in data:
+		var d: ChestItemData = ChestItemData.new()
+		d.item_id = entry[0]
+		d.item_type = entry[1]
+		d.outfit_layer = entry[2]
+		d.spawn_offset = entry[3]
+		result.append(d)
+	return result

test/unit/test_room_chest.gd

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+## Tests for ChestItemData resource and RoomChestConfig static config.
+extends GutTest
+
+
+func test_chest_item_data_default_item_type_is_holdable() -> void:
+	var d: ChestItemData = ChestItemData.new()
+	assert_eq(d.item_type, "holdable")
+
+
+func test_chest_item_data_default_outfit_layer_is_one() -> void:
+	var d: ChestItemData = ChestItemData.new()
+	assert_eq(d.outfit_layer, 1)
+
+
+func test_room_chest_config_reception_desk_has_three_items() -> void:
+	var items: Array[ChestItemData] = RoomChestConfig.get_items("reception_desk")
+	assert_eq(items.size(), 3)
+
+
+func test_room_chest_config_unknown_id_returns_empty() -> void:
+	var items: Array[ChestItemData] = RoomChestConfig.get_items("does_not_exist")
+	assert_eq(items.size(), 0)