fix(streaming): stop replaying committed recenter retirements

Root cause: pending-only live projection buckets were misclassified as landblock presentation owners during origin recentering. That manufactured a second full cleanup receipt for a generation whose first receipt was still advancing; the duplicate guard threw and the broad retry path replayed the already-committed detach 243 times.

Keep pending live projections through the spatial identity map without issuing another receipt, and fail fast when a receipt-ledger invariant occurs after detachment. Evidence: docs/research/2026-08-02-collision-throughput-handoff/p1-retirement-receipt-loop.md. Release suite, lifecycle gate, and nine-stop soak pass.

tests/AcDream.App.Tests/Streaming/LandblockPresentationPipelineTests.cs

@@ -160,6 +160,112 @@ public sealed class LandblockPresentationPipelineTests
         Assert.Equal([0x2223FFFFu], enqueued);
     }
 
+    [Fact]
+    public void OriginRecenter_PendingOnlyLiveProjectionKeepsItsExistingRetirementOwner()
+    {
+        const uint oldLandblockId = 0x2424FFFFu;
+        var live = Entity(1u, serverGuid: 0x70000004u);
+        var state = new GpuWorldState();
+        state.AddLandblock(new LoadedLandblock(
+            oldLandblockId,
+            new LandBlock(),
+            Array.Empty<WorldEntity>()));
+        state.PlaceLiveEntityProjection(oldLandblockId, live);
+
+        bool holdCleanup = true;
+        var retirements = new LandblockRetirementCoordinator(
+            state,
+            ticket => ticket.RunOnce(
+                LandblockRetirementStage.EntityLighting,
+                () =>
+                {
+                    if (holdCleanup)
+                    {
+                        throw new InvalidOperationException(
+                            "injected retained cleanup");
+                    }
+                }),
+            _ => LandblockRetirementStage.EntityLighting);
+        retirements.BeginFull(oldLandblockId);
+        Assert.Equal(1, retirements.PendingCount);
+        Assert.Equal(1, state.PendingLiveEntityCount);
+
+        var origin = new LiveWorldOriginState();
+        Assert.True(origin.TryInitialize(0x24, 0x24));
+        var controller = new StreamingController(
+            enqueueLoad: static (_, _) => { },
+            enqueueUnload: static _ => { },
+            drainCompletions: static _ => Array.Empty<LandblockStreamResult>(),
+            applyTerrain: static (_, _) => { },
+            state,
+            nearRadius: 0,
+            farRadius: 0,
+            retirementCoordinator: retirements,
+            workBudgetOptions: GenerousWorkBudget());
+        var recenter = new StreamingOriginRecenterCoordinator(controller, origin);
+
+        Assert.False(recenter.Begin(0x25, 0x25, isSealedDungeon: false));
+        Assert.True(Converge(recenter, controller, 0x24, 0x24));
+
+        Assert.Equal((0x25, 0x25), (origin.CenterX, origin.CenterY));
+        Assert.Equal(1, retirements.PendingCount);
+        Assert.Equal(1, state.PendingLiveEntityCount);
+
+        holdCleanup = false;
+        controller.Tick(0x25, 0x25);
+        Assert.Equal(0, retirements.PendingCount);
+    }
+
+    [Fact]
+    public void OriginRecenter_CommittedReceiptInvariantFailsFastInsteadOfReplayingDetach()
+    {
+        const uint landblockId = 0x2626FFFFu;
+        var state = new GpuWorldState();
+        state.AddLandblock(new LoadedLandblock(
+            landblockId,
+            new LandBlock(),
+            Array.Empty<WorldEntity>()));
+        var retirements = new LandblockRetirementCoordinator(
+            state,
+            ticket => ticket.RunOnce(
+                LandblockRetirementStage.EntityLighting,
+                static () => throw new InvalidOperationException(
+                    "injected retained cleanup")),
+            _ => LandblockRetirementStage.EntityLighting);
+        retirements.BeginFull(landblockId);
+        Assert.Equal(1, retirements.PendingCount);
+
+        // Directly violate the production publication fence so the recenter
+        // obtains a genuinely conflicting receipt after its spatial commit.
+        // The invariant must surface once; it must not become retry work.
+        state.AddLandblock(new LoadedLandblock(
+            landblockId,
+            new LandBlock(),
+            Array.Empty<WorldEntity>()));
+
+        var origin = new LiveWorldOriginState();
+        Assert.True(origin.TryInitialize(0x26, 0x26));
+        var controller = new StreamingController(
+            enqueueLoad: static (_, _) => { },
+            enqueueUnload: static _ => { },
+            drainCompletions: static _ => Array.Empty<LandblockStreamResult>(),
+            applyTerrain: static (_, _) => { },
+            state,
+            nearRadius: 0,
+            farRadius: 0,
+            retirementCoordinator: retirements,
+            workBudgetOptions: GenerousWorkBudget());
+        var recenter = new StreamingOriginRecenterCoordinator(controller, origin);
+        Assert.False(recenter.Begin(0x27, 0x27, isSealedDungeon: false));
+
+        StreamingMutationException error = Assert.Throws<StreamingMutationException>(
+            () => controller.Tick(0x26, 0x26));
+
+        Assert.True(error.MutationCommitted);
+        Assert.IsType<InvalidOperationException>(error.InnerException);
+        Assert.False(state.IsLoaded(landblockId));
+    }
+
     [Fact]
     public void OriginRecenter_DetachesFullTwentyFiveByTwentyFiveWindowAtomically()
     {