WIP checkpoint: Implement avatar loader and customization UI in Godot

scripts/avatar/avatar_loadout.gd

@@ -22,6 +22,9 @@ var slots: Dictionary = {}
 ## Validation errors found during the last validate() call.
 var validation_errors: Array[String] = []
 
+## Skin tone color override (default: transparent = use asset colors).
+var skin_tone: Color = Color.TRANSPARENT
+
 
 func _init() -> void:
 	validation_errors = []
@@ -55,6 +58,17 @@ static func from_json(json_string: String) -> AvatarLoadout:
 	else:
 		loadout.validation_errors.append("Missing 'slots' in loadout JSON")
 
+	# Parse skin_tone
+	if root.has("skin_tone"):
+		var st = root["skin_tone"]
+		if typeof(st) == TYPE_DICTIONARY:
+			loadout.skin_tone = Color(
+				st.get("r", 0.0),
+				st.get("g", 0.0),
+				st.get("b", 0.0),
+				st.get("a", 1.0)
+			)
+
 	return loadout
 
 
@@ -62,7 +76,7 @@ static func from_json(json_string: String) -> AvatarLoadout:
 func to_json() -> String:
 	var data := {
 		"base_body": base_body,
-		"slots": {}
+		"slots": {},
 	}
 
 	for slot_id in AvatarSlotRegistry.SLOT_IDS:
@@ -71,6 +85,15 @@ func to_json() -> String:
 		else:
 			data.slots[slot_id] = slots.get(slot_id, null)
 
+	# Include skin_tone if set
+	if skin_tone != Color.TRANSPARENT:
+		data["skin_tone"] = {
+			"r": skin_tone.r,
+			"g": skin_tone.g,
+			"b": skin_tone.b,
+			"a": skin_tone.a,
+		}
+
 	return JSON.stringify(data, "  ")
 
 
@@ -132,6 +155,11 @@ func validate() -> bool:
 	return validation_errors.is_empty()
 
 
+## Convenience alias for validate().
+func is_valid() -> bool:
+	return validate()
+
+
 ## Check if a specific slot is equipped with a non-null item.
 func is_equipped(slot_id: String) -> bool:
 	if not AvatarSlotRegistry.has_slot(slot_id):

scripts/avatar/avatar_slot_registry.gd

@@ -47,9 +47,32 @@ const ATTACHMENT_SLOTS: PackedStringArray = [
 const MULTI_SLOT_IDS: PackedStringArray = ["accessory"]
 
 
+## Metadata for a single slot.
+class SlotDefinition:
+	## The slot ID string (e.g. "head", "hair").
+	var slot_key: String
+	## "body_part" or "attachment".
+	var category: String
+	## Primary mount bone name(s).
+	var mount_bones: PackedStringArray
+	## Whether at most one item can occupy this slot.
+	var exclusive: bool
+	## Whether this slot replaces a base mesh.
+	var is_body_part: bool
+
+	func _init(p_slot_key: String, p_category: String, p_mount_bones: PackedStringArray,
+			p_exclusive: bool, p_is_body_part: bool) -> void:
+		slot_key = p_slot_key
+		category = p_category
+		mount_bones = p_mount_bones
+		exclusive = p_exclusive
+		is_body_part = p_is_body_part
+
+
 # Slot metadata lookup tables (indexed by SLOT_IDS position).
 # Each entry: { category, mount_bones, exclusive, is_body_part }
 var _slot_data: Dictionary = {}
+var _slot_definitions: Array[SlotDefinition] = []
 
 
 func _init() -> void:
@@ -150,6 +173,18 @@ func _build_registry() -> void:
 		},
 	}
 
+	# Build SlotDefinition objects.
+	for slot_id in SLOT_IDS:
+		var data = _slot_data[slot_id]
+		var def := SlotDefinition.new(
+			slot_id,
+			data["category"],
+			PackedStringArray(data["mount_bones"]),
+			data["exclusive"],
+			data["is_body_part"],
+		)
+		_slot_definitions.append(def)
+
 
 # ---------------------------------------------------------------------------
 # Public API
@@ -165,6 +200,21 @@ static func has_slot(slot_id: String) -> bool:
 	return slot_id in SLOT_IDS
 
 
+## Returns the SlotDefinition for a slot, or null if unknown.
+static func get_slot(slot_id: String) -> SlotDefinition:
+	if not has_slot(slot_id):
+		return null
+	for def in _slot_definitions:
+		if def.slot_key == slot_id:
+			return def
+	return null
+
+
+## Returns all SlotDefinition objects in canonical order.
+static func get_slot_definitions() -> Array[SlotDefinition]:
+	return _slot_definitions
+
+
 ## Returns the category for a slot ("body_part" or "attachment").
 static func get_category(slot_id: String) -> String:
 	if not has_slot(slot_id):