Function waiter3_callback

tests/test-scheduler-advanced-features.cpp:268–271

* @brief Callback for waiter task 3 in coordination scenarios */

 * @brief Callback for waiter task 3 in coordination scenarios
 */
void waiter3_callback() {
    advanced_callback_counter++;
    advanced_test_output.push_back("waiter3_executed");
}

/**
 * @brief Callback for TASK_INTERVAL timing test - simulates long-running task