Architecture Overview (6.0)

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┌─────────────────────────────────────────────────────────────────┐
│  Godot Layer (MoonBark.GridPlacement.Godot)                     │
│  - PlacementContext (Resource)                                  │
│  - PlacementSceneAdapter (Node)                                 │
│  - PlacementInputController (Node)                              │
│  - Godot Events → ECS Events bridge                             │
└────────────────────────────┬────────────────────────────────────┘
                             │ calls
                             ▼
┌─────────────────────────────────────────────────────────────────┐
│  ECS Layer (MoonBark.GridPlacement.ECS)                        │
│  - PlacementSystem, ManipulationSystem                          │
│  - Friflo.Engine.ECS Entity/Component                          │
│  - IEcsPlugin implementation                                    │
└────────────────────────────┬────────────────────────────────────┘
                             │ uses
                             ▼
┌─────────────────────────────────────────────────────────────────┐
│  Core Layer (MoonBark.GridPlacement.Core)                       │
│  - PlacementContext (interface)                                │
│  - IGridOccupancy, ITargetingService                           │
│  - Pure C#, no Godot dependency                                │
│  - Runs headless (dedicated server)                            │
└─────────────────────────────────────────────────────────────────┘

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public sealed class GridPlacementEcsPlugin : IEcsPlugin
{
    public void RegisterSystems(EcsWorld world, SystemRunner runner)
    {
        var placementGroup = new EcsSystemGroup("GridPlacement");
        placementGroup.Add(new PlacementExecutionSystem(world.Store, eventBus));
        placementGroup.Add(new ManipulationSystem(world.Store, eventBus));
        runner.Add(placementGroup);
    }
}