📜 WAYPOINT LESSON
Checkpoint: the player lifecycle
⭐⭐⭐ advanced⏳ 25 min read📍 Lesson 216 of 256
Guarded mutators, an unguarded mover, and clamping — all three rules in one class.
Two rules interact here: the floor at zero and the cannot-act-when- out guard. Implement them in the order the spec states them, then audit: every mutator either guards or deliberately does not.