| Character | Chapter 4 role | Change/beat | Scene gist (text-only) | |-----------|----------------|-------------|------------------------| | Protagonist | Workshop tinkering, moral pivot | Realizes tool’s output scales; hesitates to share | Protagonist tests tool; sees effect grow; pauses at knock on door | | Neighbor craftsman | Antagonistic but sympathetic | Reveals scarcity; forces ethical choice | Neighbor demands trade; protagonist weighs consequences |