Package src/speed_calc with the decorator, fast_function, slow_function, constants.py and runnable lecture steps; pytest tests with a fake clock; four screenshots rendered from real output; README lecture steps; review record RC-007. Task: MIL-002#1 Task: MIL-002#2 Task: MIL-002#3 Task: MIL-002#4 Task: MIL-002#5 Task: MIL-002#6 Task: MIL-002#7