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>

src/AcDream.App/Program.cs

@@ -31,10 +31,18 @@ var runtimeOptions = RuntimeOptions.FromEnvironment(datDir);
 
 var worldGameState = new AcDream.Core.Plugins.WorldGameState();
 var worldEvents = new AcDream.Core.Plugins.WorldEvents();
-var selection = new AcDream.Core.Selection.SelectionState();
 var uiRegistry = new AcDream.App.Plugins.BufferedUiRegistry();
+using var window = new GameWindow(
+    runtimeOptions,
+    worldGameState,
+    worldEvents,
+    uiRegistry);
 var host = new AppPluginHost(
-    new SerilogAdapter(Log.Logger), worldGameState, worldEvents, selection, uiRegistry);
+    new SerilogAdapter(Log.Logger),
+    worldGameState,
+    worldEvents,
+    window.Selection,
+    uiRegistry);
 
 var pluginsDir = Path.Combine(AppContext.BaseDirectory, "plugins");
 Log.Information("scanning plugins in {PluginsDir}", pluginsDir);
@@ -67,8 +75,6 @@ try
         catch (Exception ex) { Log.Error(ex, "plugin enable failed: {Id}", plugin.Manifest.Id); }
     }
 
-    using var window = new GameWindow(
-        runtimeOptions, worldGameState, worldEvents, selection, uiRegistry);
     window.Run();
 }
 finally