refactor: restructure interaction system into clean layers

src/Features/Interactions/Application/Interact.cs

@@ -0,0 +1,21 @@
+using Game.Features.Interactions.Contracts;
+
+namespace Game.Features.Interactions.Application;
+
+public sealed class Interact(IInteractionRegistry registry) : IInteractionHandler
+{
+    public InteractionResult TryInteract(InteractionRequest request)
+    {
+        if (!registry.TryGetTarget(request.TargetId, out IInteractionTarget target))
+        {
+            return InteractionResult.Fail(InteractionStatus.TargetNotFound, $"Target {request.TargetId} was not found.");
+        }
+
+        if (!target.CanInteract)
+        {
+            return InteractionResult.Fail(InteractionStatus.Unavailable, "The target is not currently available.");
+        }
+
+        return target.Execute(request.PlayerId);
+    }
+}

src/Features/Interactions/Application/InteractionService.cs

@@ -1,8 +0,0 @@
-using Game.Features.Interactions.Contracts;
-
-namespace Game.Features.Interactions.Application;
-
-public sealed class InteractionService(IInteractionWorld world) : IInteractionService
-{
-    public InteractionResult TryInteract(InteractionRequest request) => world.TryInteract(request);
-}

src/Features/Interactions/Application/ResolvePickupAvailability.cs

@@ -0,0 +1,19 @@
+using Game.Features.Items.Contracts;
+
+namespace Game.Features.Interactions.Application;
+
+public readonly record struct PickupAvailability(bool LeftHand, bool RightHand, bool RequiresBoth);
+
+public sealed class ResolvePickupAvailability
+{
+    public PickupAvailability Resolve(HandRequirement requirement, bool leftHandFree, bool rightHandFree)
+    {
+        if (requirement == HandRequirement.Both)
+        {
+            bool canUseBoth = leftHandFree && rightHandFree;
+            return new PickupAvailability(canUseBoth, canUseBoth, true);
+        }
+
+        return new PickupAvailability(leftHandFree, rightHandFree, false);
+    }
+}

src/Features/Interactions/Application/ResolvePickupAvailability.cs.uid

@@ -0,0 +1 @@
+uid://c6mhpn06a47qu