refactor(world): extract live entity network updates

Move Position, Vector, State, Movement, and equal-generation CreateObject routing out of GameWindow while preserving per-channel authority, ForcePosition acknowledgement, and motion-runtime ownership. Add adversarial authority and exact-wire coverage so reentrant updates and GUID reuse cannot publish stale state.

src/AcDream.App/Physics/LocalForcePositionTransaction.cs

@@ -0,0 +1,29 @@
+namespace AcDream.App.Physics;
+
+/// <summary>
+/// Preserves retail ForcePosition's atomic local order: validate the accepted
+/// Position authority, blip once, acknowledge once, then stop if the
+/// acknowledgement synchronously displaced that authority.
+/// </summary>
+internal static class LocalForcePositionTransaction
+{
+    internal static bool Apply(
+        bool isForcePosition,
+        Func<bool> isCurrent,
+        Action blip,
+        Action acknowledge)
+    {
+        ArgumentNullException.ThrowIfNull(isCurrent);
+        ArgumentNullException.ThrowIfNull(blip);
+        ArgumentNullException.ThrowIfNull(acknowledge);
+
+        if (!isForcePosition)
+            return true;
+        if (!isCurrent())
+            return false;
+
+        blip();
+        acknowledge();
+        return isCurrent();
+    }
+}