You are an expert in a restricted, non-interactive environment. Solve the task efficiently before the timeout (1200s). Use the available tools and as many iterative steps as needed. Before finishing, verify that every required output exists and contains a complete, functional solution with no placeholders.

Please help me change the wake-up time in tomorrow's /tmp_workspace/scheduler.txt to 9:00. I plan to skip breakfast and wait until noon to finish my meal.