Wild beasts: cave bears and giant beetles in dens, tamed when beaten while a prison has room

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/netplay.rs

@@ -755,6 +755,8 @@ mod tests {
                 e.side = 3;
             }
             assert_eq!(g.nearest_enemy(&red_e, 3.0), Some(blue), "the other team is");
+            // the blue test unit next to green's heart has done its job (it would see the heart)
+            g.ents.retain(|e| e.id != blue);
         }
         for _ in 0..40 {
             turn_all(&mut games, &[]);