refactor(runtime): own canonical action state

Move selection, combat, and interaction target mode under one Runtime owner; make plugins, retained UI, session routing, and typed runtime views borrow its exact children; and add failure-safe reset, instance isolation, source ownership, and normalized checkpoint coverage without changing retail ordering.

Co-authored-by: Codex <codex@openai.com>

tests/AcDream.App.Tests/UI/ItemInteractionControllerTests.cs

@@ -60,6 +60,7 @@ public sealed class ItemInteractionControllerTests
             Controller = new ItemInteractionController(
                 Objects,
                 SharedTransactions,
+                new InteractionState(),
                 playerGuid: () => Player,
                 sendUse: requestUse is null ? Uses.Add : null,
                 sendExamine: Examines.Add,
@@ -341,6 +342,7 @@ public sealed class ItemInteractionControllerTests
         Assert.Throws<ArgumentException>(() => new ItemInteractionController(
             objects,
             transactions,
+            new InteractionState(),
             playerGuid: () => Player,
             sendUse: null,
             sendUseWithTarget: null,