Initial commit: Item Interaction Ecosystem plugin (UE5.7)

Server-authoritative, data-driven item/inventory/interaction/carry/equipment/
world-slot/placement/crafting framework. 8 modules, compiles against UE 5.7.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Source/ItemInteraction/Private/ItemInteractionActions.cpp

@@ -0,0 +1,97 @@
+// Copyright ExByte Studios. Item Interaction Ecosystem.
+
+#include "ItemInteractionActions.h"
+#include "ItemInteractionLog.h"
+#include "ItemInteractionInterfaces.h"
+#include "ItemNativeTags.h"
+#include "InventoryComponent.h"
+#include "GameFramework/Character.h"
+
+// --- Instant Pickup ---
+
+UInteractionAction_InstantPickup::UInteractionAction_InstantPickup()
+{
+	ActionTag = ItemEcosystemTags::Action_Pickup_Instant;
+	Mode = EItemInteractionMode::InstantPickup;
+	Priority = 600;
+	DisplayText = NSLOCTEXT("ItemInteraction", "PickUp", "Pick Up");
+}
+
+void UInteractionAction_InstantPickup::Execute_Implementation(const FInteractionContext& Context)
+{
+	if (!Context.TargetActor || !Context.PlayerInventory || !Context.TargetActor->Implements<UWorldItemProvider>())
+	{
+		return;
+	}
+	IWorldItemProvider* Provider = Cast<IWorldItemProvider>(Context.TargetActor);
+	FItemInstanceData Item;
+	if (!Provider || !Provider->IsItemAvailable() || !Provider->GetProvidedItem(Item))
+	{
+		return;
+	}
+	const int32 Before = Item.Quantity;
+	Context.PlayerInventory->AddItem(Item);
+	if (Before - Item.Quantity <= 0)
+	{
+		return;
+	}
+	if (Item.Quantity <= 0) { Provider->NotifyItemTaken(Context.Character.Get()); }
+	else { Provider->UpdateProvidedItem(Item); }
+}
+
+// --- Open Loot UI (client-side; no server effect) ---
+
+UInteractionAction_OpenLootUI::UInteractionAction_OpenLootUI()
+{
+	ActionTag = ItemEcosystemTags::Action_Open;
+	Mode = EItemInteractionMode::OpenLootUI;
+	Priority = 700;
+	DisplayText = NSLOCTEXT("ItemInteraction", "Open", "Open");
+}
+
+// --- Inspect ---
+
+UInteractionAction_Inspect::UInteractionAction_Inspect()
+{
+	ActionTag = ItemEcosystemTags::Action_Inspect;
+	Mode = EItemInteractionMode::Inspect;
+	Priority = 400;
+	DisplayText = NSLOCTEXT("ItemInteraction", "Inspect", "Inspect");
+}
+
+void UInteractionAction_Inspect::Execute_Implementation(const FInteractionContext& Context)
+{
+	UE_LOG(LogItemInteraction, Verbose, TEXT("Inspect %s"), *GetNameSafe(Context.TargetActor));
+}
+
+// --- Combine / Transfer / Split / Merge ---
+// These are inventory-UI verbs; their execution runs through the interaction
+// component's inventory RPCs. The classes exist as authoring units (section 16).
+
+UInteractionAction_Combine::UInteractionAction_Combine()
+{
+	Mode = EItemInteractionMode::Combine;
+	Priority = 300;
+	DisplayText = NSLOCTEXT("ItemInteraction", "Combine", "Combine");
+}
+
+UInteractionAction_TransferContainerItem::UInteractionAction_TransferContainerItem()
+{
+	Mode = EItemInteractionMode::TransferContainerItem;
+	Priority = 300;
+	DisplayText = NSLOCTEXT("ItemInteraction", "Transfer", "Transfer");
+}
+
+UInteractionAction_SplitStack::UInteractionAction_SplitStack()
+{
+	Mode = EItemInteractionMode::SplitStack;
+	Priority = 300;
+	DisplayText = NSLOCTEXT("ItemInteraction", "Split", "Split Stack");
+}
+
+UInteractionAction_MergeStack::UInteractionAction_MergeStack()
+{
+	Mode = EItemInteractionMode::MergeStack;
+	Priority = 300;
+	DisplayText = NSLOCTEXT("ItemInteraction", "Merge", "Merge Stack");
+}