Phase 1 B3: enemies die with a corpse window instead of popping out of existence

Server: HealthApplyDamageSystem marks EnemyTag Dying{UntilTick} (TickUtil.
NonZero, ~54 ticks) on the lethal 0-crossing instead of instant destroy,
zeroes every live cue (replicated AttackWindup, LungeState + IsLunging bit,
KnockbackState), destroys on expiry; plain-world tests keep instant destroy
(no NetworkTime) so the suite's assertions stay meaningful.

Every consumer now ignores corpses (all confirmed entity-count/unfiltered by
the design review): EnemyAISystem all 4 passes, BossAISystem brain + summon
cap, RoomEnemyDirector room-clear + MaxAlive fit, WaveSystem cap + cleared,
CyclePhaseSystem breach wipe + DefendCleared, ThreatDirector timeout cull,
TurretFire targeting, CoreDamage drain, ProjectileDamage snapshot (corpses
are not shields), AbilityFire auto-aim candidates, debug cull + telemetry.
Wipe passes skip Dying to avoid cross-ECB double-destroys.

Client: EnemyAnimationDriveSystem finally drives the controller's IsDead
param (Health.Current<=0 is the replicated death read; corpse locomotion
zeroed); CombatFeedbackSystem moves the kill CRUNCH to the 0-crossing (the
prune-edge timing would land it ~1 s late) - the prune keeps a small
dissolve puff for corpses and the legacy full read for alive-vanish culls.

456/456 EditMode.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Assets/_Project/Scripts/Simulation/Combat/AbilityFireSystem.cs

@@ -82,8 +82,9 @@ namespace ProjectM.Simulation
                 foreach (var (tx, th, te) in
                          SystemAPI.Query<RefRO<LocalTransform>, RefRO<Health>>().WithAny<TrainingDummyTag, EnemyTag>().WithEntityAccess())
                 {
+                    if (th.ValueRO.Current <= 0f) continue; // B3: corpses are neither aim magnets nor cleave targets
                     candidatePositions.Add(tx.ValueRO.Position);
-                    if (th.ValueRO.Current > 0f) { coneTargets.Add(te); coneTargetPos.Add(tx.ValueRO.Position); }
+                    coneTargets.Add(te); coneTargetPos.Add(tx.ValueRO.Position);
                 }
             }
             var candidates = candidatePositions.AsArray();