First commit for private source control. Older commits available on Github.

Assets/Scripts/Framework/Managers/Interaction/Data/BaseInteraction.cs

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+using System;
+using BriarQueen.Framework.Coordinators.Events;
+using BriarQueen.Framework.Managers.Player;
+using BriarQueen.Framework.Managers.Player.Data;
+using Cysharp.Threading.Tasks;
+
+namespace BriarQueen.Framework.Managers.Interaction.Data
+{
+    /// <summary>
+    ///     Inventory-safe per-item logic. Serialized INSIDE ItemDataSo via SerializeReference.
+    ///     No scene objects required.
+    /// </summary>
+    [Serializable]
+    public abstract class BaseInteraction
+    {
+        /// <summary>
+        ///     Called when player uses 'self' on 'other' from the inventory UI.
+        ///     Return true if the interaction was handled (success OR "can't" message shown).
+        ///     Return false if this interaction doesn't apply, so caller may try other routes/fallback.
+        /// </summary>
+        public abstract UniTask<bool> TryUseWith(
+            ItemDataSo self,
+            ItemDataSo other,
+            PlayerManager playerManager,
+            EventCoordinator eventCoordinator);
+    }
+
+    /// <summary>
+    ///     Default "does nothing" interaction.
+    /// </summary>
+    [Serializable]
+    public sealed class NoOpItemInteraction : BaseInteraction
+    {
+        public override UniTask<bool> TryUseWith(
+            ItemDataSo self,
+            ItemDataSo other,
+            PlayerManager playerManager,
+            EventCoordinator eventCoordinator)
+        {
+            return UniTask.FromResult(false);
+        }
+    }
+}