Boss becomes a real fight + readable-but-fair enemy threat

BossState (server-only) + BossAISystem: sole mover, seek -> telegraphed
radial slam (AttackWindup) -> phase-2 speed + swarmer summon. Excluded from
the EnemyAISystem Charger pass; knockback-immune at all 3 stamp sites;
arena-anchored spawn; scaled Health/HitRadius/AttackRange. Grunt windup now
commits in its last ~30% (whiffs out-of-range); Charger stagger roots; grunt
speed 4.2->5.2; swarmer telegraph synced. SweptMove + zone-enemy spawn-stamp
extracted to shared helpers. Zero new [GhostField].

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Assets/_Project/Prefabs/EnemyWerewolf.prefab

@@ -927,7 +927,7 @@ MonoBehaviour:
   m_EditorClassIdentifier: ProjectM.Authoring::ProjectM.Authoring.EnemyAuthoring
   MaxHealth: 30
   HitRadius: 0.7
-  MoveSpeed: 4.2
+  MoveSpeed: 5.2
   AttackRange: 1.6
   AttackDamage: 5
   AttackCooldownTicks: 48