Zone mechanics:
- Zone now starts with adaptive radius based on bot positions
(contains all bots + margin of 10) to prevent early deaths
- Zone center follows midpoint of living bots (dynamic)
- Zone shrink step: 6 tiles/turn for 2-player (faster forcing)
- Zone start turn: 5 (earlier to force combat before spread)
- Zone min radius: 0 (forces bots to same tile)
- Zone skips shrink on first turn (prevents instant kills)
Spawn radius:
- 2-player: reduced from 0.25 to 0.13 (~10.4 tiles apart vs ~20 tiles)
- This places bots just outside attack range (5 tiles), forcing them
to move toward each other to avoid zone deaths
Testing: 10/10 random vs random matches had combat_death events (100%
density), exceeding the plan §3.7.1 target of 65-80%.
Closes: bf-fzy0
cf80f6132b