basic ECS spawner

addons/gecs/tests/systems/s_process_test_a.gd

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+## Simple test system for performance benchmarking
+# test batch processing
+class_name ProcessTestSystem_A
+extends System
+
+
+var process_count: int = 0
+
+func _init(_process_empty: bool = false):
+	process_empty = _process_empty
+
+
+func query():
+	return ECS.world.query.with_all([C_TestA])
+
+
+# Unified process function for batch processing
+func process(entities: Array[Entity], components: Array, delta: float):
+	process_count += 1
+	var c_test_a_components = ECS.get_components(entities, C_TestA)
+	for i in range(entities.size()):
+		# Simulate some light processing
+		var component = c_test_a_components[i]
+		if component:
+			# Access component data (simulates typical system work)
+			var _data = component.serialize()
+			# Simulates a task/action execution system, it clears some task-specific
+			# components after completing the task for better performance.
+			entities[i].remove_component(C_TestA)
+	return true
+
+func reset_count():
+	process_count = 0