Plan: §3.7.1 Spawn mechanics, §3.8 Map Generation
The map generator was using outdated core placement radius (0.35) that
placed cores too far apart on 40x40 maps (~28 tiles between cores on
opposite sides). This exceeded the attack radius (6 tiles for 2-player,
3.5 tiles for 3+ player), meaning generated maps didn't force combat.
The match runner was already fixed in commit e8fda06 to use:
- 2-player: primaryRadius = 0.15 (6 tiles apart = attack radius)
- 3+ player: primaryRadius = 0.063 (~3.4 tiles, within attack radius)
This change aligns cmd/acb-mapgen with the same logic, ensuring all
generated maps place cores within attack range.
Also adds validation test TestGenerateMap_CoresWithinAttackRadius to
verify cores are placed within attack radius on standard 40x40 maps.
Closes: bf-2wn4
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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