A typed DamageEvent contract (systems/combat/damage_event.gd) as a single
entry point for every attacker, plus a characterization test locking the bull's
damage reception. Attacker/receiver wiring rides along with the moved actor
scripts in the reorg commit.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CCyaJPTHCH9EDthpf4A5Sj
