fix: complete retail parity stability pass

tests/AcDream.Runtime.Tests/Physics/RuntimeCollisionPrefixQuiescenceTests.cs

@@ -330,23 +330,18 @@ public sealed partial class RuntimeCollisionPrefixQuiescenceTests
     /// root holds an operation. (Additionally, a parked record has
     /// <c>FullCellId == 0</c>, so it is not an affected resident at all.)
     ///
-    /// <para><b>The real hazard is not a throw, it is an unbounded streaming
-    /// stall — and this test PINS it as a stall, not as a pass.</b> A retained
-    /// preparation retry keeps its landblock prefix in placement debt, so the
-    /// retirement is refused on EVERY poll and the landblock never retires.
-    /// There is no bound: the retirement coordinator simply retries, and
-    /// <c>TickLostCellDeadlines</c> — the only expiry that could break the
-    /// cycle — has NO production caller, so its deadline never fires. The only
-    /// thing that clears it is an inbound packet for that same entity, which
-    /// is exactly what a <c>RetrySetupUnavailable</c> on an asset that never
-    /// loads does not produce.</para>
+    /// <para>#310: collision retirement now supersedes an authored mover that
+    /// is still waiting for its first preparation. The exact unprepared
+    /// operation is cancelled before ordinary placement-debt evaluation, so
+    /// the resident enters the normal retirement park and the prefix can
+    /// converge without an inbound packet or asset-readiness edge.</para>
     ///
     /// <para>This is a pre-existing hazard independent of route 4b-1, filed as
     /// its own issue. 4b-1 does NOT bound it; it only avoids widening it, by
     /// declining to retain operations for destinations it cannot service.</para>
     /// </summary>
     [Fact]
-    public void RetainedPreparationRetryStallsPrefixRetirementIndefinitely()
+    public void RetainedPreparationRetryIsCancelledByPrefixRetirement()
     {
         using var fixture = new Fixture();
         RuntimeEntityRecord record = fixture.Add(
@@ -358,7 +353,7 @@ public sealed partial class RuntimeCollisionPrefixQuiescenceTests
         // A retained preparation retry: begun, never prepared — the shape a
         // RetrySetupUnavailable on an asset that never resolves leaves behind.
         RuntimeEntityPlacementToken retained = fixture.Lifetime.Physics
-            .SetPosition.BeginAcceptedPlacement(
+            .SetPosition.BeginAuthoredPlacement(
                 record,
                 record.PositionAuthorityVersion,
                 RuntimeSetPositionOperationKind.RemoteAuthoritative);
@@ -366,29 +361,14 @@ public sealed partial class RuntimeCollisionPrefixQuiescenceTests
 
         RuntimeCollisionPrefixQuiescenceToken token = fixture.Begin(2UL);
 
-        // The production retirement path, polled hard. Permission is refused
-        // every single time; nothing in the system advances it.
-        for (int poll = 0; poll < 1_000; poll++)
-        {
-            Assert.False(
-                fixture.TryAcquire(token, out _),
-                $"retirement unexpectedly acquired permission on poll {poll}; "
-                    + "if this now succeeds the stall has been bounded and "
-                    + "this test's pinned decision must be revisited");
-        }
+        // The first production poll cancels the unprepared operation and
+        // enters the ordinary two-phase resident-withdrawal handshake.
+        Assert.False(fixture.TryAcquire(token, out _));
+        Assert.False(fixture.Lifetime.Physics.SetPosition
+            .IsPlacementCurrent(retained));
+        Assert.Equal(1, fixture.Lifetime.Physics.CaptureOwnership()
+            .SetPositionOperationCount); // the replacement retirement park
 
-        // ParkCollisionResidents was never entered, so its overlap throw could
-        // not fire — the contract's item 6, proven structurally.
-        Assert.True(fixture.Lifetime.Physics.IsSpatialRoot(record));
-        Assert.False(fixture.Lifetime.Physics.SetPosition.TryPeekProjection(
-            out _));
-
-        // And the discriminator: retiring the retained operation is what
-        // releases the prefix. Once the debt is gone the ordinary two-phase
-        // handshake proceeds — ParkCollisionResidents withdraws the residents
-        // and permission follows the withdrawal acknowledgements — so drain
-        // those exactly as the production host does.
-        _ = fixture.Lifetime.Physics.SetPosition.ForgetExactPlacement(retained);
         bool acquired = false;
         for (int poll = 0; poll < 32 && !acquired; poll++)
         {
@@ -404,8 +384,8 @@ public sealed partial class RuntimeCollisionPrefixQuiescenceTests
         }
         Assert.True(
             acquired,
-            "clearing the retained preparation retry must let the prefix "
-                + "retire; if it does not, the stall has a second cause");
+            "prefix retirement must converge after it supersedes an "
+                + "unprepared mover operation");
     }
 
     [Fact]