feat(net): port retail physics spawn and event timestamps

Parse the complete PhysicsDesc plus F754/F755 packets, correct every PhysicsState bit, and gate all nine retail update channels with generation-safe immutable snapshots. Preserve ForcePosition, teleport, placement, velocity, parent, pickup, delete, and same-generation CreateObject ordering from the named client.

Separate accepted logical lifecycle notifications from retained UI qualities, make GUID replacement and session reset clear every projection exactly once, and add packet, wraparound, malformed-input, parent FIFO, canonical-position, reconnect, and GUID-reuse conformance coverage.

Co-Authored-By: Codex <noreply@openai.com>

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

@@ -0,0 +1,71 @@
+using AcDream.App.UI;
+using AcDream.Core.Items;
+
+namespace AcDream.App.Tests.UI;
+
+public sealed class AutoWieldGenerationTests
+{
+    private const uint Player = 0x50000001u;
+
+    [Fact]
+    public void GenerationReplacementCancelsPendingWeaponSwitch()
+    {
+        var objects = new ClientObjectTable();
+        var blocker = new ClientObject
+        {
+            ObjectId = 0x60000001u,
+            WielderId = Player,
+            ValidLocations = EquipMask.MeleeWeapon,
+        };
+        objects.AddOrUpdate(blocker);
+        objects.MoveItem(
+            blocker.ObjectId,
+            Player,
+            newSlot: -1,
+            newEquipLocation: EquipMask.MeleeWeapon);
+        var requested = new ClientObject
+        {
+            ObjectId = 0x60000002u,
+            ContainerId = Player,
+            ValidLocations = EquipMask.MeleeWeapon,
+        };
+        objects.AddOrUpdate(requested);
+
+        using var controller = new AutoWieldController(
+            objects,
+            () => Player,
+            sendWield: null,
+            sendPutItemInContainer: (_, _, _) => { },
+            toast: null);
+        Assert.True(controller.TryWield(requested));
+        Assert.True(controller.IsBusy);
+
+        objects.ReplaceGeneration(WorldReplacement(blocker.ObjectId), generation: 2);
+
+        Assert.False(controller.IsBusy);
+    }
+
+    private static WeenieData WorldReplacement(uint guid) => new(
+        Guid: guid,
+        Name: "replacement",
+        Type: ItemType.Misc,
+        WeenieClassId: 1,
+        IconId: 0,
+        IconOverlayId: 0,
+        IconUnderlayId: 0,
+        Effects: 0,
+        Value: null,
+        StackSize: null,
+        StackSizeMax: null,
+        Burden: null,
+        ContainerId: null,
+        WielderId: null,
+        ValidLocations: null,
+        CurrentWieldedLocation: null,
+        Priority: null,
+        ItemsCapacity: null,
+        ContainersCapacity: null,
+        Structure: null,
+        MaxStructure: null,
+        Workmanship: null);
+}