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/Client/Presentation/EnemyAnimationDriveSystem.cs

@@ -41,6 +41,7 @@ namespace ProjectM.Client
         static readonly FastAnimatorParameter k_MoveZ       = new FastAnimatorParameter("MoveZ");
         static readonly FastAnimatorParameter k_Speed       = new FastAnimatorParameter("Speed");
         static readonly FastAnimatorParameter k_IsAttacking = new FastAnimatorParameter("IsAttacking");
+        static readonly FastAnimatorParameter k_IsDead      = new FastAnimatorParameter("IsDead"); // B3: the controller's Death state existed but was never driven
 
         // prevPos cache (per Husk Entity). Pruned every frame (a vanished Husk = a server-authoritative death).
         NativeParallelHashMap<Entity, float3> _prevPos;
@@ -63,7 +64,7 @@ namespace ProjectM.Client
             var seen = new NativeParallelHashSet<Entity>(64, Allocator.TempJob);
             var job = new EnemyDriveJob
             {
-                moveX = k_MoveX, moveZ = k_MoveZ, speed = k_Speed, isAttacking = k_IsAttacking,
+                moveX = k_MoveX, moveZ = k_MoveZ, speed = k_Speed, isAttacking = k_IsAttacking, isDead = k_IsDead,
                 dt = dt,
                 prevPos = _prevPos,
                 seen = seen,
@@ -91,7 +92,7 @@ namespace ProjectM.Client
         [WithAll(typeof(EnemyTag))]
         partial struct EnemyDriveJob : IJobEntity
         {
-            public FastAnimatorParameter moveX, moveZ, speed, isAttacking;
+            public FastAnimatorParameter moveX, moveZ, speed, isAttacking, isDead;
             [Unity.Collections.ReadOnly] public ComponentLookup<IsLunging> isLunging; // A7: a lunge has no AttackWindup; OR it in so the boss/Charger attack anim plays during the committed lunge
 
             public float dt;
@@ -104,7 +105,8 @@ namespace ProjectM.Client
                 DynamicBuffer<AnimatorControllerParameterComponent> parametersArr,
                 in LocalTransform xform,
                 in EnemyStats stats,
-                in AttackWindup windup)
+                in AttackWindup windup,
+                in Health health)
             {
                 seen.Add(e);
                 float3 cur = xform.Position;
@@ -117,11 +119,17 @@ namespace ProjectM.Client
                 float3 p = AnimParamMath.LocomotionParams(vel, facing, stats.MoveSpeed);
                 bool attacking = windup.WindUpUntilTick != 0 || (isLunging.HasComponent(e) && isLunging.IsComponentEnabled(e)); // A7: the committed lunge (which zeroes AttackWindup) still animates as an attack
 
+                // B3: the corpse window — Health.Current is replicated, so <=0 IS the death read. A corpse
+                // plays the Death state and nothing else (no jog, no frozen attack).
+                bool dead = health.Current <= 0f;
+                if (dead) { p = float3.zero; attacking = false; }
+
                 var a = new AnimatorParametersAspect(parametersArr, indexTable);
                 if (a.HasParameter(moveX))       a.SetParameterValue(moveX, p.x);
                 if (a.HasParameter(moveZ))       a.SetParameterValue(moveZ, p.y);
                 if (a.HasParameter(speed))       a.SetParameterValue(speed, p.z);
                 if (a.HasParameter(isAttacking)) a.SetParameterValue(isAttacking, attacking);
+                if (a.HasParameter(isDead))      a.SetParameterValue(isDead, dead);
             }
         }
     }