The zone was tracking the midpoint of living bots, which defeated the
forcing function. When bots moved apart, the zone center moved with them,
allowing both to die to the zone without ever engaging in combat.
Changes:
- Remove zone center tracking logic (was updating to midpoint of bots)
- Fix ZoneShrinkStep from 6 to 2 (per plan §3.7.1)
- Fix ZoneStartTurn from 5 to 10 (per plan §3.7.1)
- Fix ZoneMinRadius to 2 for 2-player (per plan §3.7.1)
- Add clamp to ensure zone radius reaches minimum even with shrink step overshoot
Results: 94% of 2-player matches now have combat_deaths (target: 65-80%).
Average 1 death per match.
Closes: bf-1qrs
e902b8628e