feat: add emergent world foundations

world/targets/WorldTargetHandle.gd

@@ -0,0 +1,52 @@
+class_name WorldTargetHandle
+extends RefCounted
+
+var _registry_instance_id: int
+var _context_id: StringName
+var _target_id: StringName
+var _target_kind: StringName
+var _generation: int
+
+
+func _init(
+	registry_instance_id: int = 0,
+	context_id: StringName = &"",
+	target_id: StringName = &"",
+	target_kind: StringName = &"",
+	generation: int = 0
+) -> void:
+	_registry_instance_id = registry_instance_id
+	_context_id = context_id
+	_target_id = target_id
+	_target_kind = target_kind
+	_generation = generation
+
+
+func is_well_formed() -> bool:
+	return (
+		_registry_instance_id != 0
+		and not _context_id.is_empty()
+		and not _target_id.is_empty()
+		and not _target_kind.is_empty()
+		and _generation > 0
+	)
+
+
+func get_registry_instance_id() -> int:
+	return _registry_instance_id
+
+
+func get_context_id() -> StringName:
+	return _context_id
+
+
+func get_target_id() -> StringName:
+	return _target_id
+
+
+func get_target_kind() -> StringName:
+	return _target_kind
+
+
+func get_generation() -> int:
+	return _generation