Method add_data_pin

src/core/node.py:754–756

Add a data pin for value transfer.

(self, name, direction, pin_type_str)

        return self.add_pin(name, direction, "exec", "execution")

    def add_data_pin(self, name, direction, pin_type_str):
        """Add a data pin for value transfer."""
        return self.add_pin(name, direction, pin_type_str, "data")

    def remove_pin(self, pin_to_remove):
        # Remove connections first