Further Tests & Progress

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

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+using Unity.Entities;
+using Unity.NetCode;
+
+namespace ProjectM.Simulation
+{
+    /// <summary>
+    /// Replicated Husk attack-telegraph signal. While <see cref="WindUpUntilTick"/> is non-zero the Husk is
+    /// "winding up" to strike; EnemyAISystem sets it ~<see cref="Tuning.AttackWindupTicks"/> before the strike
+    /// lands, and the strike fires when the tick elapses. This is a [GhostField] (the only replicated Husk field
+    /// beyond the stock LocalTransform) so the CLIENT can play a ~0.3s pre-strike cue — the client has none of the
+    /// server-only timing inputs (EnemyStats / EnemyAttackCooldown), so the wind-up MUST be replicated. A uint tick
+    /// (not a [GhostEnabledBit]) so the cue can ramp/countdown and survive a missed snapshot (absolute, not an edge).
+    /// </summary>
+    public struct AttackWindup : IComponentData
+    {
+        /// <summary>Server tick the wind-up completes + the strike lands (0 = not winding up; scheduled via TickUtil.NonZero).</summary>
+        [GhostField] public uint WindUpUntilTick;
+    }
+}

Assets/_Project/Scripts/Simulation/Combat/AttackWindup.cs.meta

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+fileFormatVersion: 2
+guid: f2c9d899714758b4baefe6c1cbb3be0a

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

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+using Unity.Entities;
+using Unity.Mathematics;
+
+namespace ProjectM.Simulation
+{
+    /// <summary>
+    /// SERVER-ONLY transient knockback on a Husk. While <see cref="UntilTick"/> has not elapsed, EnemyAISystem
+    /// moves the Husk along <see cref="Dir"/> at <see cref="Speed"/> (REPLACING its seek) and suppresses its strike.
+    /// Stamped by ProjectileDamageSystem on a hit (Dir = the projectile's heading). NOT a [GhostField] — the Husk's
+    /// displaced position already replicates via the stock LocalTransform default variant, so knockback adds NO
+    /// replicated surface (no ghost re-bake). EnemyAISystem must remain the SOLE writer of the Husk's Position, so
+    /// knockback is applied INSIDE it (never a competing system). Force/duration live in <see cref="Tuning"/>
+    /// (KnockbackSpeed = 0 disables knockback globally).
+    /// </summary>
+    public struct KnockbackState : IComponentData
+    {
+        /// <summary>Planar (XZ) knockback heading — the projectile's direction at impact.</summary>
+        public float2 Dir;
+
+        /// <summary>Knockback speed (world units/sec) applied for the window; 0 = not knocked.</summary>
+        public float Speed;
+
+        /// <summary>Server tick until which the knockback is active (0 = none; scheduled via TickUtil.NonZero).</summary>
+        public uint UntilTick;
+    }
+}

Assets/_Project/Scripts/Simulation/Combat/KnockbackState.cs.meta

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+fileFormatVersion: 2
+guid: 9fa07e28f83ad6b43a8164b8c673a6b1

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

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+using Unity.Entities;
+
+namespace ProjectM.Simulation
+{
+    /// <summary>
+    /// SERVER-ONLY expiry tracker paired with a <see cref="StatModifier"/> by <see cref="SourceId"/>. It is NOT a
+    /// [GhostField] and lives in a SEPARATE buffer so the replicated <see cref="StatModifier"/> layout stays
+    /// byte-identical — adding ANY member (even non-ghost) to a [GhostField] buffer element regenerates its
+    /// serializer/stride/hash = an effective ghost re-bake. To grant a TIMED buff, append both a StatModifier and a
+    /// TimedModifier sharing one unique SourceId; <c>TimedModifierExpirySystem</c> removes the matching StatModifier
+    /// when <see cref="UntilTick"/> elapses, and that removal replicates for free via the StatModifier [GhostField]
+    /// buffer (OwnerSendType.All), so StatRecomputeSystem reverts the effective stat on both worlds with no change.
+    /// </summary>
+    public struct TimedModifier : IBufferElementData
+    {
+        /// <summary>Matches the <see cref="StatModifier.SourceId"/> this row governs.</summary>
+        public uint SourceId;
+
+        /// <summary>Server tick at which the paired StatModifier expires (0 = no expiry / inert; schedule via TickUtil.NonZero).</summary>
+        public uint UntilTick;
+    }
+
+    /// <summary>Pure helpers for removing modifiers by provenance (clear-by-type / timed expiry). Deterministic, no RNG/wall-clock.</summary>
+    public static class TimedModifierUtil
+    {
+        /// <summary>Remove every <see cref="StatModifier"/> row whose SourceId matches (RemoveAtSwapBack). Returns the count removed.</summary>
+        public static int RemoveBySourceId(DynamicBuffer<StatModifier> mods, uint sourceId)
+        {
+            int removed = 0;
+            for (int j = mods.Length - 1; j >= 0; j--)
+                if (mods[j].SourceId == sourceId) { mods.RemoveAtSwapBack(j); removed++; }
+            return removed;
+        }
+    }
+}

Assets/_Project/Scripts/Simulation/Combat/TimedModifier.cs.meta

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+fileFormatVersion: 2
+guid: 67465323b013e6a4cb59519111b1b9e5