feat(physics): port retail complete object frame pipeline

Restore the named-retail object update order across local, remote, static, projectile, animation, shadow, teleport, and effect lifetimes. Separate authoritative root commits from spatial rebucketing, preserve per-owner hook/FIFO ordering, and remove update-path allocations with exact lifecycle and residency gates.

Add deterministic conformance, adversarial lifetime, GUID-reuse, pending-cell, quaternion, timestamp, and allocation coverage. Release build is warning-free and all 6,446 tests pass with five intentional skips; retail, architecture, and adversarial reviews are clean.

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

tests/AcDream.Core.Tests/Physics/AnimationSequencerTests.cs

@@ -283,6 +283,27 @@ public sealed class AnimationSequencerTests
             $"Expected orientation near {rot.Z} but got {transforms[0].Orientation.Z}");
     }
 
+    [Fact]
+    public void Constructor_InstallsSetupDefaultAnimationForEveryPartArray()
+    {
+        const uint AnimId = 0x0300AA01u;
+        var setup = Fixtures.MakeSetup(1);
+        setup.DefaultAnimation = (QualifiedDataId<Animation>)AnimId;
+        var loader = new FakeLoader();
+        loader.Register(AnimId, Fixtures.MakeTwoFrameAnim(
+            1,
+            Vector3.Zero,
+            Quaternion.Identity,
+            new Vector3(2f, 0f, 0f),
+            Quaternion.Identity));
+        var sequencer = new AnimationSequencer(setup, new MotionTable(), loader);
+
+        Assert.True(sequencer.HasCurrentNode);
+        Assert.Equal(30f, sequencer.CurrentNodeDiag.Framerate);
+        Assert.Equal(0, sequencer.CurrentNodeDiag.StartFrame);
+        Assert.Equal(1, sequencer.CurrentNodeDiag.EndFrame);
+    }
+
     [Fact]
     public void Advance_FrameWrapsAtHighFrame()
     {
@@ -1883,6 +1904,36 @@ public sealed class AnimationSequencerTests
 
     // ── Helpers ──────────────────────────────────────────────────────────────
 
+    [Fact]
+    public void InitializeSetupDefaultAnimation_PreservesPhysicsAndPlacementState()
+    {
+        // CPartArray::InitDefaults (0x00518980) replaces only the animation
+        // list. It does not call CSequence::clear, so the PartArray's existing
+        // velocity, omega, and placement frame survive this operation.
+        const uint animationId = 0x03000531u;
+        var loader = new FakeLoader();
+        loader.Register(
+            animationId,
+            Fixtures.MakeAnim(2, 1, Vector3.Zero, Quaternion.Identity));
+        var seq = new AnimationSequencer(
+            Fixtures.MakeSetup(1),
+            new MotionTable(),
+            loader);
+        var placement = new AnimationFrame(1);
+        Vector3 velocity = new(1f, 2f, 3f);
+        Vector3 omega = new(0.1f, 0.2f, 0.3f);
+        seq.Core.SetVelocity(velocity);
+        seq.Core.SetOmega(omega);
+        seq.Core.SetPlacementFrame(placement, 0x1234u);
+
+        Assert.True(seq.InitializeSetupDefaultAnimation(animationId));
+
+        Assert.Equal(velocity, seq.CurrentVelocity);
+        Assert.Equal(omega, seq.CurrentOmega);
+        Assert.Same(placement, seq.Core.PlacementFrame);
+        Assert.Equal(0x1234u, seq.Core.PlacementFrameId);
+    }
+
     /// <summary>
     /// Expose the core CSequence's FrameNumber via reflection (test-only).
     /// R1-P5 rehost (2026-07-02): _framePosition lived directly on