chore(client): add gdUnit4 test framework addon

Vendor gdUnit4 for Godot 4 client testing (D-030).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/addons/gdUnit4/src/network/rpc/RPC.gd

@@ -0,0 +1,37 @@
+class_name RPC
+extends RefCounted
+
+
+var _data: Dictionary = {}
+
+
+func _init(obj: Object = null) -> void:
+	if obj != null:
+		if obj.has_method("serialize"):
+			_data = obj.call("serialize")
+		else:
+			_data = inst_to_dict(obj)
+
+
+func get_data() -> Object:
+	return dict_to_inst(_data)
+
+
+func serialize() -> String:
+	return JSON.stringify(inst_to_dict(self))
+
+
+# using untyped version see comments below
+static func deserialize(json_value: String) -> Object:
+	var json := JSON.new()
+	var err := json.parse(json_value)
+	if err != OK:
+		push_error("Can't deserialize JSON, error at line %d:\n	error: %s \n	json: '%s'"
+			% [json.get_error_line(), json.get_error_message(), json_value])
+		return null
+	var result: Dictionary = json.get_data()
+	if not typeof(result) == TYPE_DICTIONARY:
+		push_error("Can't deserialize JSON. Expecting dictionary, error at line %d:\n	error: %s \n	json: '%s'"
+			% [result.error_line, result.error_string, json_value])
+		return null
+	return dict_to_inst(result)

client/addons/gdUnit4/src/network/rpc/RPC.gd.uid

@@ -0,0 +1 @@
+uid://jait5n7vbrfd

client/addons/gdUnit4/src/network/rpc/RPCClientConnect.gd

@@ -0,0 +1,13 @@
+class_name RPCClientConnect
+extends RPC
+
+var _client_id: int
+
+
+func with_id(id: int) -> RPCClientConnect:
+	_client_id = id
+	return self
+
+
+func client_id() -> int:
+	return _client_id

client/addons/gdUnit4/src/network/rpc/RPCClientConnect.gd.uid

@@ -0,0 +1 @@
+uid://cc8jxqn7tvv44

client/addons/gdUnit4/src/network/rpc/RPCClientDisconnect.gd

@@ -0,0 +1,13 @@
+class_name RPCClientDisconnect
+extends RPC
+
+var _client_id: int
+
+
+func with_id(id: int) -> RPCClientDisconnect:
+	_client_id = id
+	return self
+
+
+func client_id() -> int:
+	return _client_id

client/addons/gdUnit4/src/network/rpc/RPCClientDisconnect.gd.uid

@@ -0,0 +1 @@
+uid://c67vtfsgam8g

client/addons/gdUnit4/src/network/rpc/RPCGdUnitEvent.gd

@@ -0,0 +1,14 @@
+class_name RPCGdUnitEvent
+extends RPC
+
+
+static func of(p_event: GdUnitEvent) -> RPCGdUnitEvent:
+	return RPCGdUnitEvent.new(p_event)
+
+
+func event() -> GdUnitEvent:
+	return GdUnitEvent.new().deserialize(_data)
+
+
+func _to_string() -> String:
+	return "RPCGdUnitEvent: " + str(_data)

client/addons/gdUnit4/src/network/rpc/RPCGdUnitEvent.gd.uid

@@ -0,0 +1 @@
+uid://dn157jkjh10vw

client/addons/gdUnit4/src/network/rpc/RPCMessage.gd

@@ -0,0 +1,18 @@
+class_name RPCMessage
+extends RPC
+
+var _message: String
+
+
+static func of(msg :String) -> RPCMessage:
+	var rpc := RPCMessage.new()
+	rpc._message = msg
+	return rpc
+
+
+func message() -> String:
+	return _message
+
+
+func _to_string() -> String:
+	return "RPCMessage: " + _message

client/addons/gdUnit4/src/network/rpc/RPCMessage.gd.uid

@@ -0,0 +1 @@
+uid://by4gy5xupil2c