basic ECS spawner

addons/gecs/tests/systems/s_velocity_system.gd

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+## Traditional system approach for velocity-based movement
+class_name S_VelocitySystem
+extends System
+
+var process_count: int = 0
+
+func query():
+	return ECS.world.query.with_all([C_TestPosition, C_TestVelocity])
+
+func process(entities: Array[Entity], components: Array, delta: float):
+	for entity in entities:
+		process_count += 1
+		var pos = entity.get_component(C_TestPosition)
+		var vel = entity.get_component(C_TestVelocity)
+
+		# Update position based on velocity
+		# Note: Direct assignment without using setter to avoid triggering observers
+		pos.position = pos.position + vel.velocity * delta
+
+func reset_count():
+	process_count = 0