refactor(input): own gameplay action routing

Move the sole semantic action-priority graph, combat and diagnostic commands, and retained-root item-drop lifetime behind focused typed owners. Preserve retail toggle behavior, explicit auto-wield cancellation, shutdown quiescence, and symmetric callback cleanup.

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

src/AcDream.App/Input/CameraPointerInputController.cs

@@ -74,13 +74,19 @@ internal sealed class SilkPointerCursorModeTarget(IMouse mouse)
     }
 }
 
+internal interface IPointerSensitivityCommands
+{
+    string AdjustSensitivity(float factor);
+}
+
 /// <summary>
 /// Owns raw pointer subscriptions and the camera-facing pointer policy that
 /// previously lived in GameWindow. Physical event removal is retriable; logical
 /// deactivation is immediate, so a copied or stubborn Silk delegate cannot
 /// re-enter gameplay while shutdown is closing the live session.
 /// </summary>
-internal sealed class CameraPointerInputController : IDisposable
+internal sealed class CameraPointerInputController
+    : IDisposable, IPointerSensitivityCommands
 {
     private readonly IReadOnlyList<IRawPointerSurface> _surfaces;
     private readonly IPointerCursorModeTarget _cursor;