ninja 2 electric boogaloo (#15534)

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Client/Communications/CommsHackerSystem.cs

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+using Content.Shared.Communications;
+
+namespace Content.Client.Communications;
+
+/// <summary>
+/// Does nothing special, only exists to provide a client implementation.
+/// </summary>
+public sealed class CommsHackerSystem : SharedCommsHackerSystem
+{
+}

Content.Client/Ninja/Systems/NinjaGlovesSystem.cs

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+using Content.Shared.Ninja.Systems;
+
+namespace Content.Client.Ninja.Systems;
+
+/// <summary>
+/// Does nothing special, only exists to provide a client implementation.
+/// </summary>
+public sealed class NinjaGlovesSystem : SharedNinjaGlovesSystem
+{
+}

Content.Client/Ninja/Systems/NinjaSuitSystem.cs

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+using Content.Shared.Clothing.EntitySystems;
+using Content.Shared.Ninja.Components;
+using Content.Shared.Ninja.Systems;
+
+namespace Content.Client.Ninja.Systems;
+
+/// <summary>
+/// Disables cloak prediction since client has no knowledge of battery power.
+/// Cloak will still be enabled after server tells it.
+/// </summary>
+public sealed class NinjaSuitSystem : SharedNinjaSuitSystem
+{
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<NinjaSuitComponent, AttemptStealthEvent>(OnAttemptStealth);
+    }
+
+    private void OnAttemptStealth(EntityUid uid, NinjaSuitComponent comp, AttemptStealthEvent args)
+    {
+        args.Cancel();
+    }
+}

Content.Client/Ninja/Systems/NinjaSystem.cs

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+using Content.Shared.Ninja.Systems;
+
+namespace Content.Client.Ninja.Systems;
+
+/// <summary>
+/// Currently does nothing special clientside.
+/// All functionality is in shared and server.
+/// Only exists to prevent crashing.
+/// </summary>
+public sealed class SpaceNinjaSystem : SharedSpaceNinjaSystem
+{
+}

Content.Client/Research/ResearchStealerSystem.cs

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+using Content.Shared.Research.Systems;
+
+namespace Content.Client.Research;
+
+/// <summary>
+/// Does nothing special, only exists to provide a client implementation.
+/// </summary>
+public sealed class ResearchStealerSystem : EntitySystem
+{
+}