All backlog items completed:
- Combat kill scoring in engine (turn.go:274)
- Fitness formula blends win rate + kill rate (run.go:608)
- Flee thresholds reduced with outnumber logic
- CombatDeaths tracked through arena MatchOutcome
- Aggression derived from actual kill rate in behavior vector
This Genesis bead tracked the full mechanics iteration to make combat
economically necessary and reward aggression in the evolver.
